Vitocal 300-G Technical Guide1.4 MB - Viessmann

VIESMANN VITOCAL 300-G 

Brine/water and water/water heat pump 

Single and two-stage, from 21 kW 

Technical guide 

Heat pump with electric drive for DHW and central heating in 

mono-mode or dual mode heating systems. 

VITOCAL 300-G Type BW/BWS, WW 

■ Type BW/BWS: 

Brine/water heat pump, 21.2 to 42.8 kW. 

■ Type WW: 

Water/water heat pump, 28.1 to 57.4 kW. 

■ Type BW/WW: 

For single stage operation or operation at stage 1 of a twostage 

heat pump. 

■ Type BWS: 

As stage 2 of a two-stage heat pump for increased output in 

conjunction with type BW/WW. 

■ Highly flexible due to combination with modules of different 

output. 

■ Easier handling through small and light modules. 

5457 919 GB 2/2010

Index 

Index 

1. Vitocal 300-G 1. 1 Product description ..................................................................................................... 4 

■ Benefits of type BW/BWS, WW .............................................................................. 4 

■ Delivered condition ................................................................................................. 4 

1. 2 Specification ............................................................................................................... 5 

■ Specification ............................................................................................................ 5 

■ Dimensions of type BW/BWS, WW ......................................................................... 7 

■ Output diagrams ..................................................................................................... 8 

2. Installation accessories 2. 1 Primary circuit ............................................................................................................. 11 

■ Sensor well set, primary circuit ............................................................................... 11 

■ Brine circuit pressure switch ................................................................................... 11 

■ Brine accessory pack .............................................................................................. 11 

■ Primary pump .......................................................................................................... 12 

■ Brine distributor for geothermal collectors .............................................................. 13 

■ Brine distributor for geothermal probes/geothermal collectors ............................... 14 

■ Heat transfer medium Tyfocor ................................................................................ 16 

■ Filling station ........................................................................................................... 16 

2. 2 Secondary circuit ........................................................................................................ 17 

■ Secondary pump ..................................................................................................... 17 

■ Safety equipment block ........................................................................................... 18 

2. 3 Cooling ........................................................................................................................ 19 

■ Contact humidistat .................................................................................................. 19 

■ Natural cooling extension kit ................................................................................... 19 

■ 2-way motorised ball valve (DN 32) ........................................................................ 19 

■ Three-way diverter valve (R 1¼) ............................................................................. 19 

■ Room temperature sensor ...................................................................................... 19 

■ Frost stat ................................................................................................................. 19 

■ Fan convectors Vitoclima 200-C ............................................................................. 19 

2. 4 DHW heating via an external heat exchanger ............................................................ 22 

■ 2-way motorised ball valve (DN 32) ........................................................................ 22 

■ Cylinder primary pump ............................................................................................ 22 

3. Design information 3. 1 Power supply and tariffs ............................................................................................. 22 

■ Application procedure ............................................................................................. 22 

3. 2 Positioning requirements ............................................................................................ 22 

■ Minimum clearances ............................................................................................... 23 

■ Min. space requirement .......................................................................................... 23 

■ Electrical connections ............................................................................................. 23 

3. 3 Hydraulic connections ................................................................................................. 26 

■ Connections on the primary side brine/water (stages 1 and 2) ............................... 26 

■ Connections on the primary side water/water (stages 1 and 2) .............................. 28 

■ Connections on secondary side for two-stage heat pumps .................................... 31 

3. 4 System versions ......................................................................................................... 33 

3. 5 Sizing the heat pump .................................................................................................. 34 

■ Mono-mode operation ............................................................................................. 34 

■ Mono-energetic operation ....................................................................................... 35 

■ Dual mode operation ............................................................................................... 35 

■ Supplement for DHW heating ................................................................................. 35 

■ Supplement for setback mode ................................................................................ 36 

3. 6 Heat source for brine/water heat pumps ..................................................................... 36 

■ Frost protection ....................................................................................................... 36 

■ Geothermal collector ............................................................................................... 36 

■ Geothermal probe ................................................................................................... 39 

■ Expansion vessel for primary circuit ....................................................................... 40 

■ Pipework, primary circuit ......................................................................................... 41 

■ Pump output supplements (percentage) for operation with Tyfocor ....................... 43 

3. 7 Heat source for water/water heat pumps .................................................................... 43 

■ Groundwater ........................................................................................................... 43 

■ Calculating the required groundwater volume ........................................................ 44 

■ Permits for a groundwater/water heat pump system .............................................. 44 

■ Sizing the heat exchanger, primary circuit/separating heat exchanger .................. 45 

■ Cooling water .......................................................................................................... 45 

3. 8 Central heating/central cooling ................................................................................... 46 

■ Heating circuit ......................................................................................................... 46 

■ Heating circuit and heat distribution ........................................................................ 46 

■ Cooling operation .................................................................................................... 47 

2 VIESMANN VITOCAL 300-G 

5457 919 GB

Index (cont.) 

3. 9 Systems with heating water buffer cylinder ................................................................ 47 

■ Heating water buffer cylinder operated in parallel ................................................... 47 

■ Heating water buffer cylinder for optimised runtimes .............................................. 48 

■ Heating water buffer cylinder for bridging periods when the supply is blocked ...... 48 

3.10 Water quality ............................................................................................................... 48 

■ Heating water .......................................................................................................... 48 

3.11 DHW heating .............................................................................................................. 49 

■ DHW connection ..................................................................................................... 49 

■ Function description regarding DHW heating ......................................................... 49 

■ Hydraulic connection, primary store system ........................................................... 50 

3.12 Cooling operation ........................................................................................................ 53 

■ Types and configuration .......................................................................................... 53 

■ Cooling function Natural cooling ............................................................................. 53 

■ Hydraulic connection, natural cooling function ........................................................ 53 

3.13 Swimming pool water heating ..................................................................................... 56 

■ Hydraulic connection, swimming pool ..................................................................... 56 

■ Sizing the plate heat exchanger .............................................................................. 57 

3.14 Connection of solar thermal systems .......................................................................... 57 

■ Sizing the solar expansion vessel ........................................................................... 58 

4. Heat pump control unit 4. 1 Vitotronic 200, type WO1A ......................................................................................... 59 

■ Structure and functions ........................................................................................... 59 

■ Time switch ............................................................................................................. 59 

■ Setting the operating programs ............................................................................... 60 

■ Frost protection function ......................................................................................... 60 

■ Heating and cooling curve settings (slope and level) .............................................. 60 

■ Heating systems with heating water buffer cylinder or low loss header .................. 61 

■ Outside temperature sensor ................................................................................... 61 

■ Specification Vitotronic 200, type WO1A ................................................................ 61 

4. 2 Control unit accessories ............................................................................................. 62 

■ Contactor relay ........................................................................................................ 62 

■ Contact temperature sensor as system flow temperature sensor ........................... 63 

■ Cylinder temperature sensor ................................................................................... 63 

■ Thermostat for controlling the swimming pool temperature .................................... 63 

■ Contact temperature sensor ................................................................................... 63 

■ Mixer motor ............................................................................................................. 64 

■ Extension kit for one heating circuit with mixer with integral mixer motor ............... 64 

■ Extension kit for one heating circuit with mixer for separate mixer motor ............... 65 

■ Immersion thermostat ............................................................................................. 65 

■ Contact thermostat .................................................................................................. 65 

■ Vitotrol 200A ........................................................................................................... 66 

■ Room temperature sensor for separate cooling circuit ........................................... 66 

■ KM BUS distributor ................................................................................................. 67 

■ External extension H1 ............................................................................................. 67 

■ Vitocom 100, type GSM .......................................................................................... 67 

■ Vitocom 300, type FA5, FI2, GP2 ........................................................................... 68 

■ LON communication module ................................................................................... 69 

■ LON connecting cable for data exchange between control units ............................ 70 

■ Extension of the connecting cable .......................................................................... 70 

■ Terminator ............................................................................................................... 70 

5. Keyword index .............................................................................................................................................. 71 

5457 919 GB 

VITOCAL 300-G VIESMANN 3

1 

Vitocal 300-G 

1.1 Product description 

Heat pumps with electric drive for DHW and central heating in monomode, 

mono-energetic or dual mode operation. 

The brine/water heat pumps extract heat from the ground with the help 

of geothermal collectors or probes. 

The ground provides almost completely stable temperatures all the 

year round, enabling the heat pumps to operate virtually independently 

of the outside temperature. They can cover the entire heat demand of 

a building, even on colder days. 

Benefits of type BW/BWS, WW 

The water/water heat pumps with delivery and return wells gain heat 

from the groundwater which offers stable temperatures, enabling the 

heat pumps to achieve constantly high COPs. 

Consequently they are suitable for year round heating operation and 

DHW provision. 

A Hermetically sealed Compliant scroll compressor 

B Condenser 

C Evaporator 

D Only type BW/WW: 

Weather-compensated, digital heat pump control unit 

Vitotronic 200, type WO1A 

■ Mono-mode for central and DHW heating. 

■ Menu-guided heat pump control unit Vitotronic 200, type WO1A, for 

weather-compensated heating mode. 

■ Max. flow temperature of 60 °C for high DHW convenience and ideal 

for modernising an existing radiator heating system. 

■ High COP to EN 14511: up to 4.8 (brine 0 °C/water 35 °C). 

■ Low operating costs with the highest efficiency at every operating 

point through the innovative RCD (Refrigerant Cycle Diagnostic) 

system with electronic expansion valve. 

■ Especially suitable for low heating system temperatures, e.g. underfloor 

heating. 

■ Highly flexible due to combination with modules of different output. 

■ Low noise and vibration emissions through 3-D sound concept 

■ Convenient for applying for subsidies: with integral energy statement. 

■ Easier handling through small and light modules. 

■ Higher output can be achieved through cascade arrangement: 

21.2 to 342.4 kW 

■ Type BWS: 

As stage 2 of a two-stage heat pump for increased output in conjunction 

with type BW and WW. 

Delivered condition 

Type BW 

■ Compact heat pump design (with soft starter). 

■ Epoxy-coated casing. 

■ CFC-free, non-combustible refrigerant R 410A (refrigerant mixture, 

comprising 50 % R 32 and 50 % R 125). 

■ Evaporator and condenser made from copper-soldered stainless 

steel plate heat exchanger (1.4401), for the heating circuit and brine/ 

groundwater circuit. 

■ Electronic expansion valve and patented refrigerant distribution. 

■ New refrigerant RCD (Refrigerant Cycle Diagnostic) circuit diagnostic 

system. 

■ Outside temperature sensor, flow and return temperature sensors 

plus sensors for the primary circuit flow and return. 

■ With fitted weather-compensated digital heat pump control unit 

Vitotronic 200, type WO1A 

Type WW 

■ Heat pump type BW 

■ Water/water heat pump conversion kit (frost stat for primary circuit 

and flow limiter for well circuit) 

Type BWS 

■ Heat pump type BW without heat pump control unit 

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4 VIESMANN VITOCAL 300-G

Vitocal 300-G (cont.) 

1.2 Specification 

Specification 

Type BW/BWS 

BW/BWS 121 129 145 

Output data to DIN EN 14511 (0/35 °C, 5 K spread) 

Rated heating output kW 21.2 28.8 42.8 

Refrigerating capacity kW 17.0 23.3 34.2 

Power consumption kW 4.48 5.96 9.28 

Coefficient of performance ∊ (COP) 4.73 4.83 4.6 






Brine (primary circuit) 

Content l 7.3 9.1 12.7 

Min. flow rate (Δt = 5 K) l/h 3300 4200 6500 

Pressure drop mbar 90 120 200 

Max. flow temperature °C 25 25 25 

Min. flow temperature °C –5 –5 –5 

Heating water (secondary circuit) 

Content l 7.3 9.1 12.7 

Min. flow rate (Δt = 10 K) l/h 1900 2550 3700 



1 

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Type WW 

WW 121 129 145 






Brine (primary circuit) 

Content l 7.3 9.1 12.7 


Pressure drop mbar 200 300 440 

Max. inlet temperature °C 25 25 25 

Min. inlet temperature °C -5 -5 -5 

Heating water (secondary circuit) 

Content l 7.3 9.1 12.7 




Type BW/BWS, WW 

BW/BWS, WW 121 129 145 

Rated voltage, heat pump compressor stage 2 (type BWS) V 3/PE 400 V/50 Hz 

Rated current, compressor A 16 22 34 

Starting current, compressor (with starting current limiter) A


1 

BW/BWS, WW 121 129 145 

Refrigerant circuit 

Refrigerant R 410 A 

Fill volume kg 6.5 7.3 10.0 

Compressor Type Hermetically sealed scroll compressor 

Permiss. operating pressure, high pressure side bar 43 43 43 

Permiss. operating pressure, low pressure side bar 28 28 28 

Permiss. operating pressure 

Primary circuit bar 3 3 3 

Secondary circuit bar 3 3 3 

Dimensions 

Total length mm 1085 1085 1085 

Total width mm 780 780 780 

Total height (with open control unit) mm 1267 1267 1267 

Connections 

Primary flow and return G 2 2 2 

Heating flow and return G 2 2 2 

Weight 

Heat pump stage 1 (type BW/WW) kg 282 305 345 

Heat pump stage 2 (type BWS) kg 277 300 340 

Sound power level at 0/35 °C 

(test with reference to DIN EN ISO 9614-2) 

dB(A) 42 44 44 

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Dimensions of type BW/BWS, WW 

1 

1074 

88 

171 

301 

86 

< 42 V 

230 V 

400 V 

< 42 V 

230 V 

400 V 

86 

88 

171 

301 

60 

1074 87 

1267 

540 

270 

230 

540 

270 

230 

1025 

1025 60 

= 300 

780 780 

Type BWS on the left; type BW/WW on the right 

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Output diagrams 

1 

Type 121 

35 

30 

25 

20 

D 

E 

F 

G 

D 

E 

F 

G 

A Heating output 

B Refrigerating capacity 

C Power consumption 

D T HV = 35 °C 

E T HV = 45 °C 

F T HV = 55 °C 

G T HV = 60 °C 

T HV Heating circuit flow temperature 

Note 

Data for the COP was calculated with reference to DIN EN 14511. 

A 

15 

Output in kW 

Ɛ Coefficient of performance (COP) 

B 

10 

C 

5 

0 

-5 0 5 

Water or brine temperature in °C 

8 

7 

6 

5 

4 

3 

2 

1 

0 

-5 0 5 


10 

10 

G 

F 

E 

D 

15 

D 

E 

F 

G 

15 

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Type 129 

45 

40 

35 

30 

D 

E 

F 

G 

D 

E 

F 




D T HV = 35 °C 

E T HV = 45 °C 

F T HV = 55 °C 

G T HV = 60 °C 


Note 


1 

G 

25 

A 

20 

B 

15 

Output in kW 

Ɛ Coefficient of performance (COP) 

10 

C 

5 

0 

-5 0 5 


8 

7 

6 

5 

4 

3 

2 

1 

0 

-5 0 5 


10 

10 

G 

F 

E 

D 

15 

D 

E 

F 

G 

15 

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Type 145 

1 

70 

60 

50 

40 

D 

E 

F 

G 

D 

E 

F 

G 




D T HV = 35 °C 

E T HV = 45 °C 

F T HV = 55 °C 

G T HV = 60 °C 


Note 


A 

30 

Output in kW 

Coefficient of performance ε (COP) 

B 

20 

C 

10 

0 

-5 0 5 


7 

6 

5 

4 

3 

2 

1 

0 

-5 0 5 


10 

10 

G 

F 

E 

D 

15 

D 

E 

F 

G 

15 

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Installation accessories 

2.1 Primary circuit 

Sensor well set, primary circuit 

Part no. 7460 714 

For on-site primary circuit pipework. 

Brine circuit pressure switch 

Part no. 9532 663 

Note 

Cannot be used in conjunction with potassium carbonate-based heat 

transfer medium. 

Components: 

■ Pipe with connection R1¼ (2 pce) 

■ Sensor well for temperature sensors (flow and return) 

Note 

The temperature sensors are included in the standard delivery of the 

heat pump. 

2 

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Brine accessory pack 

Only for single stage heat pump type BW 121 and BW 129. 

■ For systems with a brine circuit pump (primary pump) in the brine 

return. 

■ Suitable for Viessmann heat transfer medium "Tyfocor" based on 

ethylene glycol (see chapter "Heat transfer medium"). 

■ Brine accessory pack for single and two-stage heat pumps, thermally 

insulated with vapour diffusion-proof material. 

Components: 

■ Air separator 

■ Safety valve (3 bar) 

■ Pressure gauge 

■ Drain & fill valves (2 pce) 

■ Fittings for installing the primary pump 

■ Shut-off valves 

■ Wall mounting bracket 

■ Thermal insulation (vapour diffusion-proof) 

■ Expansion vessel 

■ Subject to part no., with or without circulation pump 

Heat pump type BW 121 BW 129 BW 145 

Expansion vessel 35 l 50 l on-site 

Part no. for brine accessory 

pack 

Without circulation pump Z008 585 Z008 586 on-site 

(Connection set for on-site 

circulation pump G 2) 

With Wilo high efficiency Z008 594 — 

circulation pump, type 

Stratos Para (3 - 11 m), 

230 V~ 

(Connection set for on-site 

circulation pump G 1½) 

With Wilo standard circulation 

pump: 

– Type TOP S 30/7, Z008 591 — 

400 V~ 

(Connection set for onsite 

circulation pump 

G 2) 

– Type TOP S 30/10, 

400 V~ 

(Connection set for onsite 

circulation pump 

G 2) 

— Z008 592 

Circulation pump curves 

See chapter "Primary pump". 


Installation accessories (cont.) 

670 

86 

E 

D 

2 

F 

G 1¼ G 1¼ 

H 

360 

C 

G 

B 

B 

G 1¼ 

N 

B 

A 

192 

G 1¼ 

192 

K 

M 

L 

C 

A Primary circuit flow (heat pump brine inlet) 

B Ball valve 

C Drain & fill valve 

D Pressure switch connection 

E Air separator 

F Primary circuit flow (brine inlet, brine accessory pack) 

G Pressure gauge 

H Safety valve (3 bar) 

K Primary circuit return (brine outlet, brine accessory pack) 

L Expansion vessel connection 

M Primary circuit return (heat pump brine outlet) 

N Primary pump 

Assembly and installation information 

■ Fit the brine accessory pack horizontally to ensure the correct function 

of the air separator. 

■ Fit the air blow-off connector above the brine accessory pack. 

■ Check the circulation pump for an adequate residual head (see 

curves). 

Position the pump cable entry so that it points downwards or to the 

l.h. or r.h. side, or turn the pump head if required. 

■ If the brine circuit pressure switch is not connected, the brine accessory 

pack can also be installed in the external interconnecting duct 

(waterproof). 

Primary pump 

For installation in the primary circuit return (brine return) 

Components: 

■ Circulation pump 400 V~ 

■ Thermal insulation (vapour diffusion-proof) 

■ Contactor relay 

Note 

For operation with water/Tyfocor, the pump output supplements 

should be taken into account (see page 43). 

Heat pump type BW 121 BW 129 BW 145 

Circulation pump part no. 

Wilo standard circulation 

Z007 441 — on-site 

pump, 

type TOP S 30/7, 

400 V~ 

Wilo standard circulation 

pump, 

type TOP S 30/10, 

400 V~ 

— Z007 442 

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Wilo standard circulation pump curves 

Wilo high efficiency circulation pump curves 

Only in conjuction with brine accessory pack. 

8 

7 

6 

5 

4 

3 

min. (3 ) 

(2 ) 

max. (1 ) 

Head 

in m 

12 

10 

8 

6 

4 

2 

0 

0 1 2 3 4 5 

Pump rate in m³/h 

2 

Head in m 

2 

1 

0 

0 1 2 3 4 5 6 7 8 


Type TOP S 30/7, 400 V~ 

12 

11 

10 

9 

8 

7 

6 

Head in m 

5 

4 

min. (3 ) 

(2 ) 

max. (1 ) 

3 

2 

1 

0 

0 1 2 3 4 5 6 7 8 9 10 11 12 


Output in W 

160 

140 

max. 

120 

10 m 

8 m 

100 

6 m 

80 

4 m 

60 

40 

2 m 

20 

0 

0 1 2 3 4 5 


Type Stratos Para (3 - 11 m), 230 V~ 

Type TOP S 30/10, 400 V~ 

Brine distributor for geothermal collectors 

(Vitocal rated heating output: max. 37.1 kW) 

Part no. 7143 762 

Brass brine distributor, pre-assembled on two anti-vibration mounts. 

Can be fitted to the house wall, in the cellar duct or in the central service 

duct. 

■ 2 quick-acting air vent valves 

■ 1 drain & fill valve per header 

Up to 4 brine distributors can be connected to each flow and return. 

Components: 

■ 2 headers for flow and return 

■ Flow and return connections for 10 brine circuits, ball valves and 

locking ring fittings (PE 20 × 2.0) 

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670 

545 

33 

52 

1¼" 

55 

200 

2 

1¼" 

63 

A Header G 1¼ (flow) 

B Header G 1¼ (return) 

C Locking ring fittings for PE 20 × 2.0 mm 

D Ball valve for filling and draining 

E Ball valves for shutting off the individual circuits 

F Sound-absorbing panel 

Connection versions 

VL 

1 2 3 4 5 6 7 8 910 

RL 

10 9 8 7 6 5 4 3 2 1 

1 2 3 4 5 6 7 8 9 10 

11 12 13 14 15 16 17 18 19 20 

RL Brine return 

VL Brine flow 

10 9 8 7 6 5 4 3 2 1 

20 19 18 17 16 15 14 13 12 11 

Note 

For the allocation of brine distributor to heat pump type, see table in 

design information, "Heat sources for brine/water heat pumps", 

page 37. 

A Brine flow 

B Brine return 

Brine distributor for geothermal probes/geothermal collectors 

Locking ring fittings 

Number of brine circuits Part no. 

Geothermal 

probes 

Geothermal 

collectors 

PE 25 x 2.3 — 2 7373 332 

— 3 7373 331 

— 4 7182 043 

PE 32 x 2.9 2 2 7373 330 

3 3 7373 329 

4 4 7143 763 

Brine distributor for geothermal probes/geothermal collectors 

Nickel-plated brine distributor. Can be fitted to the house wall, in the 

cellar duct or in the central service duct. 

Components: 

■ Header for separate flow and return 

■ Flow and return connections for 2, 3 or 4 brine circuits, ball valves 

and locking ring fittings (PE 25 × 2.3 or PE 32 × 2.9) 

■ Installation accessories 

■ 2 drain & fill valves 

Up to 4 brine distributors can be connected to each flow and return. 

Brine distributors for 2, 3 and 4 brine circuits can be combined in any 

order. 

5457 919 GB 



175 

335 

A 

C 

B 

E 

≈ 80 

F 

≈ 130 

2 

80 

D 

80 

Brine distributor for 2 brine circuits 


A 

B 

255 

C 

A Union nut G 2 for ball valve connection, locking ring fitting or a 

further module 

B Ball valve for filling and draining 

C Header G 1½ 

D Locking ring fittings for PE 32 × 2.9 mm or PE 25 × 2.3 mm 

E 2" end cap with G ½ plug 

F Ball valves for shutting off the individual circuits 

E 

≈ 130 

F 

80 

D 


Connection versions 

1 2 3 

4 

VL 

VL 

4 3 2 

1 

RL 

1 2 3 

4 

5 6 7 

8 

Example for 4 brine circuits 

4 3 2 

1 

8 7 6 

RL 

5 


VL Brine flow 

Example for 8 brine circuits 


VL Brine flow 

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Note 

For the allocation of brine distributor to heat pump type, see tables in 

design information, "Heat sources for brine/water heat pumps", 

pages 37 and 39. 



Heat transfer medium Tyfocor 

■ 30 l in a disposable container 

Part no. 9532 655 

■ 200 l in a disposable container 

Part no. 9542 602 

Light green ready mixed medium for the primary circuit, down to 

–15 °C, based on ethylene glycol with corrosion inhibitors. 

2 

Filling station 

Part no. 7188 625 

For filling the primary circuit. 

Components: 

■ Self-priming impeller pump (30 l/min) 

■ Dirt filter, inlet side 

■ Hose, inlet side (0.5 m) 

■ Connection hose (2 pce, each 2.5 m) 

■ Packing crate (can be used as flushing tank) 

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2.2 Secondary circuit 

Secondary pump 

Secondary pump (DHW and central heating) 

Wilo standard circulation pump, type RS Part no. 7338 850 

25/6-3, 230 V~ 

(only for Vitocal with rated heating output up to 

28.8 kW) 

Secondary pump (central heating) 

Grundfos, type UPS 25-60, 230 V~ Part no. 7338 851 

Laing EC Vario 25/180 G (class B), 230 V~ Part no. 7374 788 

Wilo standard circulation pump curves 

Head in m 

Output in W 

6 

5 

4 

3 

2 

1 

min. (3) 

(2) 

max. (1) 

0 

0 1 2 3 


70 

60 

50 

40 

30 

20 

10 

min. (3) 

(2) 

0 

0 1 2 3 


4 

max. (1) 

4 

Grundfos curves 

Head in m 

6.0 

5.0 

4.0 

3 

2 

3.0 1 

2.0 

1.0 

UPS 25-60 

0 

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 

Flow rate in m³/h 

Type UPS 25-60, 230 V~ 

Laing curves 

Head in m 

6 

5 

E6 vario 

4 

3 

E4 vario 

2 

1 

0 

0.0 0.5 1.0 1.5 2.0 2.5 3.0 


Type E4/E6 Vario 25/180, 230 V~ 

Head in m 

6 

5 

4 

E6 auto 

3 

2 

E4 auto 

1 

0 

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 


Type E4/E6 Auto 25/180, 230 V~ 

2 

Type RS 25/6-3, 230 V~ 

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Wilo high efficiency circulation pump curves 

Only in conjunction with a hydraulic module. 

2 

Head in m 

7 

6 

5 

4 

3 

2 

1 

0 

0 1 2 3 4 


60 

Output 

in W 

40 

0 

0 1 2 3 4 


Type Stratos Para (1 - 7 m), 230 V~ 

Safety equipment block 

Part no. 7143 779 

Components: 

■ Safety valve R ½ (blow-off pressure 3 bar) 

■ Pressure gauge 

■ Automatic air vent valve with automatic shut-off facility 

■ Thermal insulation 

144 

80 

232 

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2.3 Cooling 

Contact humidistat 

Part no. 7181 418 

■ Dew point contact switch 

■ to prevent the formation of condensate 

Natural cooling extension kit 

Part no. 7179 172 

Components: 

■ PCB for processing signals and controlling the natural cooling function 

■ Connection plug 

■ Installation accessories 

2 

2-way motorised ball valve (DN 32) 

Part no. 7180 573 

■ With electric drive (230 V~) 

■ Connection R 1¼" 

Three-way diverter valve (R 1¼) 

Part no. 7165 482 


■ Connection R 1¼ 

Room temperature sensor 

Part no. 7408 012 

For a separate cooling circuit. 

For specification see chapter on control unit accessories (from 

page 62) 

Frost stat 

Part no. 7179 164 

Safety switch to protect the cooling heat exchanger from frost. 

Fan convectors Vitoclima 200-C 

■ With three-way control valve 

■ With 4-pipe heat exchanger for heating and cooling 

■ For wall mounting 

Fan convector Vitoclima 200-C Type V202H V203H V206H V209H 

Z004 926 Z004 927 Z004 928 Z004 929 

Plinth for floor mounting 7267 205 

Air filter (5 pce) 7428 521 7428 522 7428 523 

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Specification 

2 

Fan convectors Vitoclima 200-C Type V202H V203H V206H V209H 

Cooling capacity kW 2.0 3.4 5.6 8.8 

Output kW 2.0 3.7 5.3 9.4 

Power supply [terminals] 

1/N/PE 230 V/50 Hz 

Fan power consumption 

at speed V1 W 45 57 107 188 

at speed V2 W 37 47 81 132 

at speed V3 W 27 39 64 112 

at speed V4 W 19 36 55 101 

at speed V5 W 16 33 41 90 

Cooling valve 

k v value m 3 /h 1.6 1.6 1.6 2.5 

Connection R 1/2 R 1/2 R 1/2 R 3/4 

Heating valve 

k v value m 3 /h 1.6 1.6 1.6 1.6 

Connection R 1/2 R 1/2 R 1/2 R 1/2 

Condensate connection Ø mm 18.5 18.5 18.5 18.5 

Thermostatically activated servomotor 

Max. permiss. ambient temperature °C 50 50 50 50 

Max. permiss. media temperature °C 110 110 110 110 

Power consumption W 3 3 3 3 

Rated current mA 13 13 13 13 

Weight kg 20 30 39 50 

Factory-set fan speed 

Dimensions 

a 

b 

231 

204 

100 

73 

170 

90 

c 

Front and side view 

A Plinth (accessory) 

Type 

Dimensions in mm 

a b c 

V202H 768 762 478 

V203H 1138 1132 478 

V206H 1508 1502 478 

V209H 1508 1502 578 

5457 919 GB 



a 

A Air outlet 

B Top 

C 4 fixing holes 7 8 mm 

D Bottom 

E Floor 

F Air inlet 

b 

100 

c 

d 

Type 


a b c d 

V202H 500 430 360 150 

V203H 870 430 360 150 

V206H 1240 430 360 150 

V209H 1240 530 365 157 

2 

Wall mounting (front view) 

220 220 

a 

b 

a 

b 

A R.H. 

B L.H. 

C Heating return connection 

D Cooling return connection 

E Heating flow connection 

F Cooling flow connection 

f 

e 

d 

c 

c 

d 

e 

f 

Type 


a b c d e f g h k 

V202H 98 56 237 254 390 408 147 189 518 

V203H 98 56 237 254 390 408 147 189 518 

V206H 98 56 237 254 390 408 147 189 548 

V209H 83 40 235 246 495 506 145 188 618 

100 

g 

h 

g 

h 

100 

Position of the hydraulic connections (side view, both sides) 

5457 919 GB 



2.4 DHW heating via an external heat exchanger 

2-way motorised ball valve (DN 32) 

Part no. 7180 573 


■ Connection R 1¼" 

Cylinder primary pump 

For DHW heating via a plate heat exchanger (on-site). 

■ Grundfos UPS 25-60 B 

Part no. 7820 403 

■ Grundfos UPS 32-80 B 

Part no. 7820 404 

9 

8 

7 

UPS 32-80 B 

3 

Curves 

Head in m 

6.0 

5.0 

4.0 

3.0 

2.0 

1.0 

0 

3 

2 

1 

UPS 25-60B 

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 


Type UPS 25-60 B, 230 V~ 

Head in m 

6 

5 

4 

3 

2 

1 

0 

0 1 2 3 4 5 6 7 8 9 10 11 


Type UPS 32-80 B, 230 V~ 

Design information 

3.1 Power supply and tariffs 

According to current Federal tariffs [Germany], the electrical demand 

for heat pumps is considered domestic usage. Where heat pumps are 

used to heat buildings, the local power supply company must first give 

permission [check with your local power supply company]. 

Check the connection conditions specified by your local power supply 

utility for the stated equipment details. It is crucial to establish whether 

a mono-mode and/or mono-energetic heat pump operation is feasible 

in the supply area. 

Application procedure 

The following details are required to assess the effect of the heat pump 

operation on the grid of your local power supply utility: 

■ User address 

■ Location where the heat pump is to be used 

■ Type of demand in accordance with general tariffs 

(domestic, agricultural, commercial, professional and other use) 

It is also important to obtain information about standing charges and 

energy tariffs, about the options for utilising off-peak electricity during 

the night and about any power-off periods. 

Address any questions relating to these issues to your customer's local 

power supply utility. 

■ Intended heat pump operating mode 

■ Heat pump manufacturer 

■ Type of heat pump 

■ Connected load in kW (from rated voltage and rated current) 

■ Max. starting current in A 

■ Max. heat load of the building in kW 

3.2 Positioning requirements 

■ The installation room must be dry and safe from the risk of frost. 

■ Never install the appliance in living spaces or directly next to, below 

or above quiet rooms/bedrooms. 

■ Maintain the minimum clearances and minimum room volume (see 

the following chapter). 

■ Sound insulation measures: 

– Heat pump installation on anti-vibration platforms or plinths (see 

next chapter). 

– Reduction of reverberative surfaces, particularly on walls and ceilings. 

Rough structural renders absorb more sound than tiles. 

– If quietness is a particularly important consideration, apply soundabsorbing 

material to the walls and ceilings (commercially available). 

■ Hydraulic connections: 

5457 919 GB 


Design information (cont.) 

– Always make hydraulic heat pump connections flexible and stressfree 

(e.g. by using Viessmann heat pump accessories). 

– Apply anti-vibration fixings to pipework and installations. 

– To prevent condensation, thermally insulate lines and components 

in the primary circuit with vapour diffusion-proof materials. 

Minimum clearances 

Note 

■ Additional strain relief clamps are required for the power cables if the 

clearance behind the heat pump is more than 80 mm. 

■ Observe clearances required for installation and maintenance 

A 

≥ 400 

= 300 

A 

≥ 400 

≥ 400 ≥ 400 

≥ 1500 

3 

≥ 1500 

Type BW/BWS, WW, type BWS (stage 2) is always positioned to the 

left of type BW, WW (stage 1) 

Type BW, WW 

A Clearance depends on on-site installation and location 

A Clearance depends on on-site installation and location 

Min. space requirement 

According to DIN EN 378 the minimum volume for the installation room 

depends on the amount and the consistency of the refrigerant. 

V min = 

m max 

G 

V min Minimum room volume in m 3 

m max max. amount of refrigerant in kg 

G Practical limit in accordance with DIN EN 378, subject to the 

refrigerant constituency 

Refrigerant Practical limit in kg/m 3 

R 407 C 0.31 

R 410 A 0.44 

R 134 A 0.25 

Note 

If several heat pumps are to be installed in one room, add the minimum 

room volumes of the individual appliances together. 

Taking into account the refrigerant used and the fill volume, the 

following minimum room volumes result: 

Rated heating output Min. space requirement 

21.2 kW 15 m 3 

28.8 kW 17 m 3 

42.8 kW 23 m 3 

5457 919 GB 

Electrical connections 

■ Observe the technical connection requirements specified by your 

local power supply utility. 

■ Your local power supply utility will provide you with details regarding 

the required metering and switching equipment. 

■ A separate electricity meter should be provided for the heat pump. 

Viessmann heat pumps operate with 400 V~ (in some countries 

230 V models are also available). 

The control circuit requires a power supply of 230 V~. 

The control circuit fuse (6.3 A) is located in the heat pump control 

unit. 



Power-OFF 

It is possible for the power supply utility to shut down the compressor 

and instantaneous heating water heater (if installed). The ability to 

carry out such a shutdown may be a power supply utility requirement 

for providing a lower tariff. 

This must not shut down the power supply to the heat pump control 

unit. 

Single stage heat pump 

D 

E 

F 

O 

U 

G 

L 

M 

P 

RS 

3 

C 

K 

H 

A 

A Heat pump type BW, WW 

C DHW cylinder 

D Outside temperature sensor, sensor lead (2 x 0.75 mm 2 ) 

E DHW circulation pump, power cable (3 x 1.5 mm 2 ) 

F Cylinder temperature sensor, sensor lead (2 x 0.75 mm 2 ) 

G Junction box 

H Motorised two-way valve, normally closed 

K Cylinder primary pump (DHW side), power cable (3 x 1.5 mm 2 ) 

L Circulation pump for cylinder heating (heating water side), power 

cable (3 x 1.5 mm 2 ) 

or 

Three-way diverter valve, power cable (5 x 1.5 mm 2 ) 

Recommendation: use the circulation pump for cylinder heating 

as hydraulic balancing is better achieved than with the three-way 

diverter valve. 

M Circulation pump, primary circuit (brine), power cable (3 x 

1.5 mm 2 or 

for circulation pump with thermal circuit breaker 5 x 1.5 mm 2 ) 

If a 400 V~ circulation pump is used, it should be connected via a 

contactor relay. 

Type WW: Note the following additional components: 

■ Well pump (If a 400 V~ well pump is used, it should be connected 

via a contactor relay.) 

■ Flow limiter 

■ Frost stat 

■ Separating heat exchanger 

O Secondary pump, power cable (3 x 1.5 mm 2 ) 

Further circulation pumps are required for heating water buffer 

cylinders, heating circuits with mixers and external heat sources; 

see system scheme, page 33. 

P Instantaneous heating water heater (on site): 

An instantaneous heating water heater (on site) can only be 

installed outside the heat pump. The flow temperature sensor 

system must be installed in the direction of flow downstream of 

the instantaneous heating water heater. 

■ Power cable: See details provided by manufacturer 

■ Control via heat pump control unit 

R Heat pump control unit power cable, 230 V~, 50 Hz (5 x 

1.5 mm 2 ) with power-OFF contact 

S Compressor power cable, 400 V~ (see table) 

U Electricity meter/mains 

Note 

For heating water buffer cylinders, heating circuits with mixers, external 

heat sources (gas/oil/wood) etc., additional supply and control 

cables and sensor leads must be factored in. 

Check the core cross-section of the power cables and enlarge if 

required. 

Recommended power cables: 

Type 

Heat pump control unit Compressor (400 V~) 

(230 V~) 

Max. cable length 

BW 121, WW 121 5 x 1.5 mm 2 4 x 2.5 mm 2 50 m 

BW 129, WW 129 5 x 1.5 mm 2 4 x 4.0 mm 2 50 m 

BW 145, WW 145 5 x 1.5 mm 2 4 x 6.0 mm 2 40 m 

Line lengths in the heat pump plus wall clearance: 

Type BW, WW BWS 

Heat pump control unit power supply (230 V~) 1.0 m A connecting cable is used for the power supply 

Compressor power supply (400 V~) 1.0 m 1.0 m 

Additional power cables 1.5 m Connecting cable 


5457 919 GB


Two-stage heat pump 

D 

E 

F 

G 

L 

M 

N 

O 

P 

RST 

U 

C 

K 

H 

B 

A 

A Heat pump type BW, WW (stage 1) 

B Heat pump type BWS (stage 2) 

C DHW cylinder 

D Outside temperature sensor, sensor lead (2 x 0.75 mm 2 ) 

E DHW circulation pump, power cable (3 x 1.5 mm 2 ) 

F Cylinder temperature sensor, sensor lead (2 x 0.75 mm 2 ) 

G Junction box 

H Motorised two-way valve, normally closed 

K Cylinder primary pump (DHW side), power cable (3 x 1.5 mm 2 ) 

L Circulation pump for cylinder heating (heating water side), power 

cable (3 x 1.5 mm 2 ) 

or 

Three-way diverter valve, power cable (5 x 1.5 mm 2 ) 

Recommendation: use the circulation pump for cylinder heating 

as hydraulic balancing is better achieved than with the three-way 

diverter valve. 

Two circulation pumps for cylinder heating are required for the 

two-stage heat pump (one for every stage; see page 31). 

M Circulation pump, primary circuit (brine), power cable (3 x 

1.5 mm 2 or 

for circulation pump with thermal circuit breaker 5 x 1.5 mm 2 ) 

If a 400 V~ circulation pump is used, it should be connected via a 

contactor relay. 

With the two-stage heat pump, either a common primary pump 

can be used for both stages, or a separate primary pump can be 

used for each stage. 

Type WW: Note the following additional components: 

■ Well pump (If a 400 V~ well pump is used, it should be connected 

via a contactor relay.) 

■ Flow limiter 

■ Frost stat 

■ Separating heat exchanger 

N Electrical connecting cables between heat pump stage 1 and 2 

(standard delivery) 

O Secondary pump, power cable (3 x 1.5 mm 2 ) 

Two secondary pumps are required for the two-stage heat pump 

(one for every stage; see page 31). 

Further circulation pumps are required for heating water buffer 

cylinders, heating circuits with mixers and external heat sources; 

see system scheme, page 33. 

P Instantaneous heating water heater (on site): 

An instantaneous heating water heater (on site) can only be 

installed outside the heat pump. The flow temperature sensor 

system must be installed in the direction of flow downstream of 

the instantaneous heating water heater. 

■ Power cable: See details provided by manufacturer 

■ Control via heat pump control unit 

R Heat pump control unit power cable, 230 V~, 50 Hz (5 x 

1.5 mm 2 ) with power-OFF contact 

S Compressor power cable, type BW, WW, 400 V~ (see table) 

T Compressor power cable, type BWS, 400 V~ (see table) 

U Electricity meter/mains 

Note 

For heating water buffer cylinders, heating circuits with mixers, external 

heat sources (gas/oil/wood) etc., additional supply and control 

cables and sensor leads must be factored in. 

Check the core cross-section of the power cables and enlarge if 

required. 

3 

5457 919 GB 

Recommended power cables: 

Type 

Heat pump control unit Compressor (400 V~) 

(230 V~) 

Max. cable length 

BW 121, WW 121 5 x 1.5 mm 2 4 x 2.5 mm 2 50 m 

BWS 121 — 4 x 2.5 mm 2 50 m 

BW 129, WW 129 5 x 1.5 mm 2 4 x 4.0 mm 2 50 m 

BWS 129 — 4 x 4.0 mm 2 50 m 

BW 145, WW 145 5 x 1.5 mm 2 4 x 6.0 mm 2 40 m 

BWS 145 — 4 x 6.0 mm 2 40 m 

Line lengths in the heat pump plus wall clearance: 

Type BW, WW BWS 

Heat pump control unit power supply (230 V~) 1.0 m A connecting cable is used for the power supply 

Compressor power supply (400 V~) 1.0 m 1.0 m 

Additional power cables 1.5 m Connecting cable 



3.3 Hydraulic connections 

Connections on the primary side brine/water (stages 1 and 2) 

Single stage heat pump (type BW) 

wP 

P 

wQ 

P 

P 

qT 

2 

3 

wU 

wW 

1 

P Primary circuit interface (see system examples) 

Required equipment 

Pos. 

Description 

1 Heat pump 

2 Heat pump control unit 

qT 

Primary pump 

wP 


wQ 

Pressure switch, primary circuit 

wW 

Brine distributor for geothermal probes/collectors 

wU 

Geothermal probes/collectors 

Two-stage heat pumps (type BW+BWS) 

Two primary pumps 

wP 

P 

wQ 

P 

qZ 

P 

qU 

wT 

qT 

2 

wU 

wW 

9 

1 


5457 919 GB 



Equipment required 

Pos. 

Description 

1 Heat pump stage 1 



qT Primary pump (heat pump stage 1) 

qZ 

Flow temperature sensor, primary circuit 

qU 

Return temperature sensor, primary circuit 

wP 


wQ 


wW 

Brine distributor, geothermal probes/collectors 

wT Primary pump (heat pump stage 2) 

wU 


One common primary pump (on site) 

wP 

P 

wQ 

P 

P 

qZ 

3 

qU 

qT 

2 

wU 

wW 

9 

1 

P Primary circuit interface 


Pos. 

Description 




qT 

Common primary pump 

qZ 


qU 


wP 


wQ 


wW 

Brine distributor, geothermal probes/collectors 

wU 


5457 919 GB 



Connections on the primary side water/water (stages 1 and 2) 

Single stage heat pump (type WW) 

wP 

P 

wQ 

P 

P 

wE 

qT 

2 

3 

wR 

wW 

qO 

1 

wZ 

wU 

wI 



Pos. 

Description 

1 Heat pump 


qT 

Primary pump 

qO 

Frost stat, primary circuit (conversion kit standard delivery) 

wP 


wQ 


wW 

Separating heat exchanger, primary circuit 

wE 

Flow limiter, well circuit ( (conversion kit standard delivery), remove jumper when connecting) 

wR 

Dirt trap 

wZ 

Well pump (suction pump for groundwater; connect via on-site contactor with fuse protection) 

wU 

Delivery well 

wI 

Return well 

5457 919 GB 



Two-stage heat pumps (type WW+BWS) 

Two primary pumps 

wP 

P 

wQ 

P 

qZ 

P 

qU 

wT 

qT 

wE 

2 

wR 

wW 

qO 

9 

1 

3 

wZ 

wU 

wI 



Pos. 

Description 

1 Heat pump stage 1 with conversion kit water/water heat pump 



qT Primary pump (heat pump stage 1) 

qZ 


qU 


qO 

Frost stat, primary circuit (component of conversion kit) 

wP 


wQ 


wW 

Heat exchanger, primary circuit 

wE 

Flow limiter, well circuit (component of conversion kit; remove jumper when connecting) 

wR 

Dirt trap 

wT Primary pump (heat pump stage 2) 

wZ 

Well pump (suction pump for groundwater; connection via on-site contactor with fuse protection) 

wU 

Delivery well 

wI 

Return well 

5457 919 GB 



One common primary pump (on site) 

wP 

P 

wQ 

P 

qZ 

P 

qU 

wE 

qT 

2 

wR 

wW 

qO 

9 1 

3 

wZ 

wU 

wI 



Pos. 

Description 

1 Heat pump stage 1 with conversion kit water/water heat pump 



qT 

Common primary pump 

qZ 


qU 


qO 

Frost stat, primary circuit (component of conversion kit) 

wP 


wQ 


wW 

Heat exchanger, primary circuit 

wE 

Flow limiter, well circuit (component of conversion kit; remove jumper when connecting) 

wR 

Dirt trap 

wZ 

Well pump (suction pump for groundwater; connection via on-site contactor with fuse protection) 

wU 

Delivery well 

wI 

Return well 

5457 919 GB 



Connections on secondary side for two-stage heat pumps 

C 

H 

W 

qP 

6 

qZ 

qQ 

5 

P 

qU 

wT 

qT 

qW 

3 

2 

P 

3 

8 

9 

1 qE 

C Cooling interface 

H Heating interface 

P Primary circuit interface (see primary circuit) 

W DHW interface (see DHW heating) 


Pos. Description 

Heat source 



3 Outside temperature sensor 

5 Circulation pump for cylinder heating (heating water side), heat pump stage 1 

6 Secondary pump, heat pump stage 1 


qP Secondary pump, heat pump stage 2 

qQ Circulation pump for cylinder heating (heating water side), heat pump stage 2 

qW Safety equipment block with safety assembly 

qE Expansion vessel 

qT Primary pump, heat pump stage 1 

qZ Flow temperature sensor, primary circuit 

qU Return temperature sensor, primary circuit 

wT Primary pump, heat pump stage 2 

Two-stage heat pump cascade 

A heat pump cascade consists of a lead appliance and up to 3 lag heat 

pumps. In a two-stage heat pump cascade, the lead appliance and lag 

heat pumps each consist of one heat pump stage 1 and one heat pump 

stage 2. 

The electrical connection is made at the heat pump stage 1 via KM 

BUS at external extension H1 (accessory). 

Note 

With external extension H1 (accessory), the swimming pool water 

heating function can be enabled in addition to the heat pump cascade 

connection. 

5457 919 GB 



qP 6 

2 2 2 2 

3 3 3 3 

9 1 9 1 9 1 9 1 

W 

IV III II I 

H 

P 

C 

5 

3 

qP 6 qP 6 qP 6 

qQ 5 

qQ 5 qQ 5 qQ 

qZ 

qZ 

qZ 

qZ 

qU 

qU 

qU 

qU 

wT qT wT qT wT qT wT qT 

C 

H 

P 

Cooling interface 

Heating interface 

Primary circuit interface 

W DHW interface 

I Lead appliance (two-stage) of the heat pump cascade 

II to IV Lag heat pump (two-stage) 1 to 3 



Heat source 



3 Outside temperature sensor 

5 Circulation pump for cylinder heating (heating water side), heat pump stage 1 

6 Secondary pump, heat pump stage 1 


qP Secondary pump, heat pump stage 2 

qQ Circulation pump for cylinder heating (heating water side), heat pump stage 2 

qT Primary pump, heat pump stage 1 

qZ Flow temperature sensor, primary circuit 

qU Return temperature sensor, primary circuit 

wT Primary pump, heat pump stage 2 

5457 919 GB 



3.4 System versions 

X Requirement 

0 Option 

Parameter 0 1 2 3 4 5 6 7 8 9 10 11 

"System 

scheme" 

Versions a b c a b c b c b c b c b c b c b c b c b c 

Heating operation and DHW heating 

Heating circuit 

A1 without 

X X X X X X X X X X X X X X 

mixer 


with 

X X X X X X X X X X X X X X X X 

mixer M2 


M3 with 

X X X X X X X X 

mixer 

DHW cylinder 

X X X X X X X X X X X X 

Heating water 

buffer cylinder 

X X X X X X X X X X X X X X X X X X X X 

External heat 

source 

X X X X X X X X X X 

Cooling mode (only one cooling circuit possible) 

Heating circ. 

A1 

0 0 0 0 0 0 0 0 0 0 0 0 0 0 


M2 

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 


M3 

0 0 0 0 0 0 0 0 

Separate 

cooling circuit 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

Swimming pool water heating 

Swimming 

pool (only 

with external 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

extension 

H1) 

Solar DHW heating 

Solar (only 

with Vitosolic 

0 0 0 0 0 0 0 0 0 0 0 

0 

100/200) 

Cascade operation 

Lead appliance 

X X X X X X X X X X X X X X X X X X X X X X X 

Lag heat 

pump 

X 

3 

5457 919 GB 



Example: 

For further examples, see "Heat pump system examples". 

3 

System version 6b: Heating circuit without mixer A1, heating circuit 

with mixer M2, DHW cylinder, heating water buffer cylinder 

3.5 Sizing the heat pump 

Note 

Sizing is of particular relevance to heat pump systems that are to be operated in mono-mode, since oversized equipment will incur disproportionate 

system costs. Therefore avoid oversizing! 

First establish the standard heat load of the building Φ HL . For discussions 

with customers and for the preparation of a quotation, in most 

cases estimating the heat load is adequate. 

As with all heating systems, determine the standard heat load of the 

building in accordance with DIN EN 12831 before selecting the appropriate 

heat pump. 

Mono-mode operation 

Theoretical sizing with the power supply blocked for 3 × 2 hour 

According to DIN EN 12831, the heat pump system in mono-mode 

Older house (without thermal insulation) 120 W/m 2 

must, as sole heat source, be able to cover the entire heating demand 

of the building. 

periods 

Example: 

For a new building with good thermal insulation (50 W/m 2 ) and a 

When sizing the heat pump, observe the following: 

■ Take supplements to the heat load of the building to cover power- 

OFF periods into account. [In Germany] the power supply utility may 

cut off the power supply to heat pumps for up to 3 × 2 hours within 

heated area of 170 m 2 

■ Estimated heat load: 8.4 kW 

■ Maximum blocking time of 3 × 2 hours at a minimum outside temperature 

in accordance with DIN EN 12831 

a 24 hour period. 

Observe additional individual arrangements for customers with special 

tariffs. 

24 h, therefore, result in a daily heat volume of: 

■ 8.4 kW ∙ 24 h = 202 kWh 

■ The building inertia means that 2 hours of power-OFF periods are 

not taken into consideration. 

To cover the maximum daily heat amount, only 18 h/day are available 

for heat pump operation on account of the power-OFF periods. The 

Note 

However, the "enable time" between power-OFF periods must be at 

least as long as the preceding power-OFF period. 

Estimate of the heat load based on the heated area 

The heated surface area (in m 2 ) is multiplied by the following specific 

heat demand: 

building inertia means that 2 hours of the period during which power 

is blocked are not taken into consideration. 

■ 202 kWh / (18 + 2) h = 10.1 kW 

In other words, the heat pump output would need to be increased by 

20 %, if power-OFF periods of 3 × 2 hours per day were to be 

applied. 

Passive house 10 W/m 2 

Frequently, power-OFF periods are only invoked if there is a need to 

do so. Please contact the customer's power supply utility to enquire 

Low energy house 40 W/m 2 about power-OFF periods. 

New build (to EnEV) 50 W/m 2 

House (built prior to 1995 with standard thermal insulation) 

80 W/m 2 

5457 919 GB 



Mono-energetic operation 

In heating mode, the heat pump system is supplemented by an instantaneous 

heating water heater (on site). The control unit switches the 

instantaneous heating water heater on, subject to the outside temperature 

(dual mode temperature) and heat load. 

Note 

That part of the electric power drawn by the instantaneous heating 

water heater will generally not be charged at special tariffs. 

Sizing of typical system configurations: 

■ The heat pump heating output must be designed for approx. 70 to 

85 % of the maximum required heat load of the building in accordance 

with DIN EN 12831. 

■ The heat pump covers approx. 95 % of the annual heat load. 

■ Blocking periods must not to be taken into consideration. 

Note 

Compared to mono-mode operation, the heat pump will run for longer 

due to its smaller size. To compensate for this, increase the size of the 

heat source for brine/water heat pumps. 

For a geothermal probe system, an annual extraction rate of 

100 kWh/m ∙ p.a. should not be exceeded. 

Instantaneous heating water heater (on site) 

An electric instantaneous heating water heater can be integrated in the 

heating water flow as an auxiliary heat source. The instantaneous 

heating water heater is connected and protected via a separate power 

supply connection. 

The heat pump control unit regulates this function. The instantaneous 

heating water heater can be enabled separately for central heating and 

DHW heating. 

If enabled the respective parameter, the heat pump control unit starts 

stages 1, 2 or 3 of the instantaneous heating water heater, subject to 

the prevailing heat demand. As soon as the maximum flow temperature 

in the secondary circuit is reached, the heat pump control unit 

switches the instantaneous heating water heater off. 

Parameter "Stage at power-OFF" restricts the output stage of the 

instantaneous heating water heater for the duration of the power-OFF 

period. 

To limit the total power consumption, the heat pump control unit stops 

the instantaneous heating water heater for a few seconds directly 

before the compressor starts. Each stage is subsequently started individually 

one after the other in intervals of 10 s. 

If the instantaneous heating water heater is on and the differential 

between flow and return temperatures in the secondary circuit does 

not rise by at least 1 K within 24 h, the heat pump control unit displays 

a fault message. 

3 

Dual mode operation 

External heat source 

The heat pump control unit enables the heat pump to operate in dual 

mode with an external heat source, e.g. oil boiler. 

The external heat source is hydraulically connected to let the heat 

pump also be used as a return temperature raising facility for the boiler. 

System separation is provided either with a low loss header or heating 

water buffer cylinder. 

For optimum heat pump operation, the external heat source must be 

integrated via a mixer into the heating water flow. A quick reaction is 

achieved by directly controlling this mixer via the heat pump control 

unit. 

If the outside temperature (long-term average) is below the dual mode 

temperature, the heat pump control unit starts the external heat 

source. In case of direct heat demand from the consumers (e.g. for 

frost protection or if the heat pump is faulty), the external heat source 

is also started above the dual mode temperature. 

In addition, the external heat source can be enabled for DHW heating. 

Note 

The heat pump control unit does not contain any safety function for 

the external heat source. To prevent excessive temperatures in the 

heat pump flow and return in case of a fault, high limit safety cut-outs 

must be provided to stop the external heat source (switching threshold 

70 °C). 

Supplement for DHW heating 

For general house building, a max. DHW consumption of approx. 

50 litre per person per day at approx. 45 ºC is assumed. 

■ This represents an additional heat load of approx. 0.25 kW per person 

given a heat-up time of 8 h. 

■ This supplement will only be taken into consideration if the sum total 

of the additional heat load is greater than 20 % of the heat load calculated 

in accordance with DIN EN 12831. 

DHW demand at a DHW temperature 

of 45 °C 

Specific available heat 

Recommended heat load supplement 

for DHW heating *1 

in l/d per person in Wh/d per person in kW/person 

Low demand 15 to 30 600 to 1200 0.08 to 0.15 

Standard demand *2 30 to 60 1200 to 2400 0.15 to 0.30 

5457 919 GB 

*1 With a DHW cylinder heat-up time of 8 h. 

*2 Select a higher supplement if the actual DHW demand exceeds the stated values. 



or 

Apartment 

(billing according to demand) 

Apartment 

(flat rate billing) 

Detached house *2 

(average demand) 

Reference temperature of 

45 °C 

Specific available heat 

Recommended heat load supplement 

for DHW heating *1 

in l/d per person in Wh/d per person in kW/person 

30 approx. 1200 approx. 0.150 



3 

Supplement for setback mode 

A supplement for setback mode in accordance with DIN EN 12831 is 

not required as the heat pump control unit is equipped with a temperature 

limiter for setback mode. 

In addition, the control unit is equipped with start optimisation, which 

means that there is also no need for a supplement for heating up from 

setback mode. 

3.6 Heat source for brine/water heat pumps 

Frost protection 

To safeguard a trouble-free heat pump operation, use anti-freeze 

based on glycol in the primary circuit. This must protect against frost 

down to at least -15 °C and contain suitable anti-corrosion inhibitors. 

Ready-mixed solutions ensure an even distribution of concentrate. 

For the primary circuit, we recommend the ready-mixed solution "Tyfocor" 

which is based in ethylene glycol. 

Both functions must be enabled in the control unit. If any of the supplements 

are omitted because of the activated control unit functions 

then this must be documented when the system is handed over to the 

operator. 

If these supplements are to be taken into account in spite of the control 

options, calculate them in accordance with DIN EN 12831. 

Note 

When selecting the anti-freeze, always observe the stipulations of the 

authorising body. 

Geothermal collector 

The thermal properties of the upper layer of the earth, such as the 

volumetric thermal capacity and thermal conductivity, are largely 

dependent on the consistency and properties of the ground. 

The wetter the soil, the higher the proportion of mineral constituents 

(quartz or feldspar) of the soil and the smaller the proportion of pores, 

the better the storage characteristics and thermal conductivity. 

The specific extraction rate q E for the ground lies between approx. 10 

and 35 W/m 2 . 

F 

B 

C 

D 

E 

A 

1500 mm 

1.2 - 1.5 m 

F 

Dry sandy soil q E = 10–15 W/m 2 

Damp sandy soil q E = 15–20 W/m 2 

Dry loamy soil q E = 20–25 W/m 2 

Damp loamy soil q E = 25–30 W/m 2 

Ground with groundwater q E = 30–35 W/m 2 

H 

G 

These details enable the required ground area to be calculated subject 

to the heat load of the building and the refrigerating capacity ² K of the 

heat pump. 

² K = ² WP – P WP 

² K is the difference between the heat pump heating output (² HP ) and 

its power consumption (P HP ). 

Manifolds and headers 

The manifold and the header should be installed so that they are 

accessible for future inspections, e.g in their own distribution ducts 

outside the house or in the basement window duct. 

Every pipe circuit should be able to be isolated individually on the flow 

and return side to enable the collector to be filled and vented. 

Example of a common duct 

A Access point 7 600 mm 

B Concrete rings 

C Primary flow 

D Primary return 

E Brine distributor 

F Collector pipes 

G Crushed stone 

H Drainage 

*1 With a DHW cylinder heat-up time of 8 h. 

*2 Select a higher supplement if the actual DHW demand exceeds the stated values. 

5457 919 GB 



2° 

Example of a wall outlet 

A To the heat pump 

B Building 

C Foundations 

D Drainage 

E Seal 

F Pipe liner 

G Crushed stone 

H PE 32 × 3.0 (2.9) 

K Ground 

All pipes, profiles etc. must be made from corrosion-resistant materials. 

Flow and return lines transport cold brine (brine temperature < 

cellar temperature). For that reason, all pipes inside the house and the 

wall outlets (even inside the wall structure) must be thermally insulated 

and vapour diffusion-proof to prevent the formation of condensation 

and subsequent damage from moisture. Alternatively, a drain can be 

installed to remove condensate. Practical experience has shown that 

a prepared brine mixture is satisfactory for filling the system. 

Pipework should be routed on the outside of the building with a slight 

slope to prevent ingress of water during heavy rain. A good drainage 

system will ensure that the rainwater drains away. 

The use of approved wall outlets (e.g. Doyma) is required if the site 

makes specific demands regarding pressing water. 

Rough sizing 

Basis for sizing is the refrigerating capacity ² K of the heat pump at 

operating point B0/W35. 

Required area F E = ² K /³ E (average extraction rate subject to ground 

conditions). 

Required number of pipe circuits @ 100 m length subject to F E and the 

pipe dimension: 

■ With PE 20 × 2.0: 

Pipe circuits @ 100 m length = F E · 3/100 

■ With PE 25 × 2.3: 

Pipe circuits @ 100 m length = F E · 2/100 

■ With PE 32 × 3.0 (2.9): 

Pipe circuits @ 100 m length = F E · 1.5/100 

The detailed design depends on the ground structure and can only be 

determined following a local inspection. 

3 

Required brine distributor 100 m length at ³ E = 25 W/m 2 (estimated sizing) 

Heat pump ² K F E PE 20 × 2.0 PE 25 × 2.3 PE 32 × 2.9 

type 

(rounded) 

Pipe circuits Brine distributor 

Pipe circuits 

Brine distributor 

Pipe circuits Brine distributor 

kW m 2 Part no. Part no. Part no. 


BW 121 17 700 21 3 x 7143 762 14 2 x 7182 043 

12 4 x 7373 329 

2 x 7373 331 

BW 129 23.3 940 28 4 x 7143 762 19 on-site 14 2 x 7143 763 

2 x 7373 329 

BW 145 34.2 1370 41 on-site 27 on-site 21 on-site 

Two-stage, both stages with the same output 

BW+BWS 

34 1360 41 on-site 27 on-site 20 on-site 

121+121 

BW+BWS 

46.6 1870 56 on-site 37 on-site 28 on-site 

129+129 

BW+BWS 


145+145 

Two-stage, stages with different output 

BW+BWS 


121+129 

BW+BWS 


121+145 

BW+BWS 

129+145 

57.5 2300 69 on-site 46 on-site 35 on-site 

5457 919 GB 



Note 

Up to 4 brine distributors can be connected to a flow or return pipe. If 

more than 4 brine distributors are required, additional geothermal collector 

circuits are also required. The brine distributors and geothermal 

collector circuits must be designed and sized by a specialist contractor 

(e.g. Viessmann geothermal department or an engineering consultancy). 

Example calculations for sizing the heat source 

Selection of the heat pump 

3 

Building heat load (net heat load) 

DHW heating supplement for 

a 3-person household 

Power-OFF periods 

Total heat load of the building 

System temperature (at min. outside temp. –14 °C) 45/40 °C 

Heat pump operating point 

B0/W35 

4.8 kW 

0.75 kW (see chapter "DHW heating supplement": 0.75 kW < 20 % of building heat 

load) 

3 × 2 h/d (only 4 h are taken into consideration, see chapter "Mono-mode operation") 

5.76 kW 

The heat pump with a heating output of 6.4 kW (incl. supplement for power-OFF periods, excl. DHW heating), refrigerating capacity 

² K = 4.9 kW corresponds to the required output. 

Sizing the geothermal collector 

Average specific extraction rate ³ E = 25 W/m 2 

² K = 4.9 kW 

F E = ² K /³ E = 4900 W/25 W/m 2 ≈ 200 m 2 

The number X of required pipe circuits (PE pipe 32 × 3.0 (2.9)) @ 100 m length each results from: 

X = F E · 1.5/100 = 200 m 2 · 1.5 m/m 2 /100 m = 3 pipe circuits 

Selected: 3 pipe circuits @ 100 m length (Ø 32 mm × 3.0 (2.9) mm with 0.531 l/m) 

Required amount of heat transfer medium (V R ) 

Take the content of the geothermal collector including all supply lines, plus the volume of fittings and the heat pump into consideration. 

Provide manifolds corresponding to the number of pipe circuits. 

The low refrigerating capacity and the connection length mean that a supply line of PE 32 × 3.0 (2.9) is adequate. 

Supply line: 10 m (2 × 5 m) with PE 32 × 3.0 (2.9) 

V R = Number of pipe circuits × 100 m × Pipeline volume + Supply line length × Pipeline volume 

= 3 × 100 m × 0.531 l/m + 10 m × 0.531 l/m = 159.3 l + 5.31 l = 165 l 

Selected: 200 litre (incl. heat transfer medium in the fittings and the heat pump) 

Geothermal collector pressure drop 

Flow rate, heat pumps with 6.2 kW: 1200 l/h 

Flow rate per pipe circuit = (900 l/h)/(3 circuits of 100 m) each = 300 l/h per pipe circuit 

Δp = R value × pipe length 

R value (resistance value) for PE 32 × 3.0 (2.9) (see tables Pressure 

drop for pipelines): 

■ At 300 l/h ≈ 31.2 Pa/m 

■ At 1600 l/h ≈ 314.7 Pa/m 

Δp Pipe circuit = 32 Pa/m × 100 m = 3200 Pa 

Δp Supply line = 315 Pa/m × 10 m = 3150 Pa 

Δp permissible = 40000 Pa = 400 mbar (max. ext. pressure drop, primary side) 

Δp = Δp Pipe circuit + Δp Supply line = 3200 Pa + 3150 Pa = 6350 Pa ≙ 63.5 mbar 

Result: 

The intended geothermal collector can be used with a heat pump with 6.2 kW rated heating output, since Δp = Δp pipe circuit + Δp supply line does not 

exceed the value for Δp permissible . 

5457 919 GB 



Geothermal probe 

RL 

VL 

RL Primary return 

VL Primary flow 

A Bentonite-cement suspension 

B Protective cap 

On smaller plots, geothermal probes are an alternative to geothermal 

collectors when retrofitting existing buildings. In the following we consider 

the double U-shaped tubular probe. 

One version would be two double U-shaped tubular loops made from 

plastic in one borehole. All cavities between the pipes and the ground 

are filled with a highly conductive material (bentonite). 

We recommend the following spacing between 2 geothermal probes: 

■ Down to 50 m depth: 5 m (min.) 

■ Down to 100 m depth: 6 m (min.) 

For systems such as this, notify your local water board well in advance 

of commencing such installations. 

The geothermal probes are installed either by drilling or by ramming, 

subject to their respective design. Systems of this type require a permit 

from your local water board. 

Further information can be obtained from the geothermal probe manufacturer 

(see "Manufacturer's addresses" in the appendix). 

We recommend arranging the sizing to match the regional conditions 

and the drilling service to be carried out by the contractor suggested 

by your local Viessmann sales office. 

Possible specific extraction rates q E for double U-shaped pipe 

probes (to VDI 4640 sheet 2) 

Substructure 

Specific 

Extract rate q E in 

W/m 

General guidelines 

Poor ground (dry sediment) 

20 

(λ < 1.5 W/(m · K)) 

Normal solid rock subsoil and 

50 

water-saturated sediment 

(1.5 ≤ λ ≤ 3.0 W/(m · K)) 

Solid rock with high thermal conductivity 

70 

(λ > 3.0 W/(m · K)) 

Individual rocks 

Gravel, sand (dry) < 20 

Gravel, sand (aquiferous) 55-65 

Clay, loam (damp) 30-40 

Chalk (solid) 45-60 

Sandstone 55-65 

Acidic magmatite (e.g. granite) 55-70 

Basic magmatite (e.g. basalt) 35-55 

Gneiss 60-70 

Rough sizing 

Basis for sizing is the refrigerating capacity ² K of the heat pump at 

operating point B0/W35. 

Required probe length l = ² K /³ E (³ E = average extraction rate subject 

to ground conditions). 

The detailed sizing depends on the ground structure and the watercarrying 

ground strata, and can only be determined following a local 

inspection by the drilling contractor. 

Note 

The reduction of the number of drilled holes in favour of probe depth 

increases the pressure drop to be overcome and the required pump 

rate. 

Information regarding dual mode parallel and mono-energetic 

operation 

In case of dual mode parallel and mono-energetic operation, consider 

the higher heat source load (see "Sizing"). As a guide, a geothermal 

probe system should not exceed an extraction of 100 kWh/m ∙ a p.a. 

3 

Required geothermal probes and brine distributors at ³ E = 50 W/m, probe (to VDI 4640) for 2000 operating hours (estimated sizing) 

Heat pump type ² K PE 32 × 2.9 

Overall pipe length Geothermal probes Brine distributor 

kW m Length in m Part no. 


BW 121 17 340 4 × 85 2 × 7143 763 

BW 129 23.3 466 5 × 93 1 × 7143 763 

2 × 7373 329 

BW 145 34.2 820 8 × 103 4 × 7143 763 


BW+BWS 121+121 34 820 8 × 103 4 × 7143 763 

BW+BWS 129+129 46.6 1120 11 × 102 on-site 

BW+BWS 145+145 68.4 1640 17 × 96 on-site 


BW+BWS 121+129 40.3 970 10 × 97 on-site 

BW+BWS 121+145 51.2 1230 13 × 95 on-site 

BW+BWS 129+145 57.5 1380 14 × 99 on-site 

5457 919 GB 



Brine distributors for two-stage heat pump (BW+BWS) and single 

stage heat pump type BW 145 

The brine distributors for geothermal probes must be designed and 

sized by a specialist contractor (e.g. Viessmann geothermal department 

or an engineering consultancy). The guide values given above 

include an additional 20 %. 

Example calculations for sizing the heat source 

Selection of the heat pump 

Building heat load (net heat load) 

DHW heating supplement for 

a 3-person household 

Power-OFF periods 

Total heat load of the building 

System temperature (at min. outside temp. –14 °C) 45/40 °C 

Heat pump operating point 

B0/W35 

4.8 kW 

0.75 kW (see chapter "DHW heating supplement": 0.75 kW < 20 % of building heat 

load) 

3 × 2 h/d (only 4 h are taken into consideration, see chapter "Mono-mode operation") 

5.76 kW 

3 

The heat pump with a heating output of 6.2 kW (incl. supplement for power-OFF periods, excl. DHW heating), refrigerating capacity 

² K = 4.9 kW corresponds to the required output. 

Sizing the geothermal probe as double U-pipe 

Average extraction rate ³ E = 50 W/m probe length 

² K = 4.9 kW 

Probe length L = ² K /³ E = 4900 W/50 W/m = 98 m ≈ 100 m 

Selected pipe for the probe: PE 32 × 3.0 (2.9) with 0.531 l/m 

Required amount of heat transfer medium (V R ) 

Take the content of the geothermal probe including all supply lines, plus the volume of fittings and the heat pump into consideration. 

Provide manifolds when using > 1 probe. Size the supply line larger than the pipe circuits; we recommend PE 32 to PE 63. 

■ Geothermal probe as double U-shaped pipe 

■ Supply line: 10 m (2 × 5 m) with PE 32 × 3.0 (2.9) 

V R = 2 × Probe length L × 2 × Pipeline volume + Supply line length × Pipeline volume 

= 2 × 100 m × 2 × 0.531 l/m + 10 m × 0.531 l/m = 217.7 l 

Selected: 220 litre (incl. heat transfer medium in the fittings and the heat pump) 

Pressure drop of the geothermal probe 

Heat transfer medium: Tyfocor 

Flow rate, heat pumps with 6.2 kW: 900 l/h 

Flow rate per U-shaped pipe: 900 l/h : 2 = 450 l/h 

Δp = R value × pipe length 

R value (resistance value) for PE 32 × 3.0 (2.9) (see tables Pressure 

drop for pipelines): 

■ At 450 l/h ≈ 46.9 Pa/m 

■ At 900 l/h ≈ 190 Pa/m 

Δp Double U-shaped pipe probe = 46.9 Pa/m × 2 × 100 m = 9380 Pa 

Δp Supply line = 190 Pa/m × 10 m = 1900 Pa 

Δp permissible = 40000 Pa = 400 mbar (max. ext. pressure drop, primary side) 

Δp Double U-shaped pipe probe + Δp supply line = 9380 Pa + 1900 Pa = 11280 Pa ≙ 112 mbar 

Result: 

The intended geothermal probe can be used with a heat pump with 6.2 kW rated heating output, since Δp = 

Δp double U-shaped pipe probe + Δp supply line does not exceed the value for Δp permissible . 

Expansion vessel for primary circuit 

A diaphragm expansion vessel with a capacity of 25 l is sufficient up 

to a supply line length of 20 m and up to a size of PE 40. 

Detailed calculations are required for greater lengths. 

V A = Total system volume (brine) in litres 

V N = Rated volume of the diaphragm expansion vessel in litres 

V Z = Increase in volume during system heat-up in litres 

= V A · β 

β = Expansion factor (β for Tyfocor = 0.01) 

V V = Safety hydraulic seal (heat transfer medium Tyfocor) in litres 

= V A × (hydraulic seal: 0.005), at least 3 l (to DIN 4807) 

5457 919 GB 



p e = Permiss. terminal pressure in bar 

= p si – 0.1 · p si = 0.9 · p si 

p si = Safety valve blow-off pressure = 3 bar 

V N = V Z + V V 

P e – P st 

· (P e + 1) 

p st = Nitrogen pre-charge pressure = 1.5 bar 

Expansion vessel capacity for geothermal collector 

V A = Geothermal collector content incl. supply line + heat pump content = 130 l 

V Z = V A · β = 130 l × 0.01 = 1.3 l 

V V = V A × 0.005 = 130 l × 0.005 = 0.65 l → selected 3 l 

V N = 

1.3 litres + 3.0 litres 

2.7 bar – 1.5 bar 

· (2.7 bar + 1) = 13.25 litres 

Expansion vessel capacity for geothermal collector 

V A = Geothermal collector content incl. supply line + heat pump content = 220 l 

V Z = V A · β = 220 l × 0.01 = 2.2 l 

V V = V A × 0.005 = 220 l × 0.005 = 1.1 l → selected 3 l 

3 

V N = 

2.2 litres + 3.0 litres 

2.7 bar – 1.5 bar 

· (2.5 bar + 1) = 15.17 litres 

Pipework, primary circuit 

5457 919 GB 

Pressure drop 

The areas in the following tables with a grey background are subject 

to laminar flow, thereafter turbulent flow. 

For optimum heat extraction from the ground, we recommend sizing 

the pipework in the turbulent area. 

R value (resistance value): 

■ R value = pressure drop/m line 

■ The specified R values refer to Tyfocor heat transfer medium: 

– Kinematic viscosity = 4.0 mm 2 /s 

– Density = 1050 kg/m 3 

PE pipe 20 × 2.0 mm, PN 10 

Flow rate 

R value for Tyfocor 

l/h 

Pa/m 

100 77.4 

120 92.9 

140 108.4 

160 123.9 

180 139.4 

200 154.9 

220 170.3 

240 185.8 

260 201.3 

280 216.8 

300 232.3 

320 247.8 

340 263.3 

360 278.7 

380 294.2 

400 309.7 

PE pipe 25 × 2.3 mm, PN 10 

Flow rate 


l/h 

Pa/m 

100 27.5 

120 32.9 

140 38.4 

160 43.9 

180 49.4 

200 54.9 

220 60.4 

240 65.9 

260 71.4 

280 76.9 


320 87.8 

340 93.3 

360 98.8 

380 104.3 

400 109.8 

420 115.3 

440 120.8 

460 126.3 

480 131.7 

500 137.2 

520 142.7 

540 246.3 

560 262.4 

PE pipe 32 × 2.9 mm, PN 10 

Flow rate 


l/h 

Pa/m 


320 33.3 

340 35.4 

360 37.5 

380 39.5 

400 41.6 

420 43.7 

440 45.8 

460 47.9 

480 49.9 



3 

Flow rate 


l/h 

Pa/m 

500 52.0 

520 54.1 

540 56.2 

560 58.3 

580 60.3 

600 62.4 

620 64.5 

640 66.6 

660 68.7 

680 70.7 

700 122.5 

720 128.7 

740 135.0 

760 141.5 

780 148.1 

800 154.8 

820 161.6 

840 168.6 

860 175.7 

880 182.9 

900 190.2 

920 197.7 

940 205.3 

960 213.0 

980 220.8 

1000 228.7 

1020 236.8 

1040 245.0 

1060 253.3 

1080 261.7 

1100 270.2 

1120 278.9 

1140 287.7 

1160 296.6 

1180 305.6 

1200 314.7 

1240 333.3 

1280 352.3 

1320 371.8 

1360 391.7 

1400 412.1 

1440 433.0 

1480 454.2 

1520 475.9 

1560 498.1 

1600 520.6 

1640 543.6 

1680 567.0 

1720 590.9 

1760 615.1 

1800 639.8 

1840 664.9 

1880 690.4 

1920 716.3 

1960 742.6 

2000 769.3 

PE pipe 40 × 3.7 mm, PN 10 

Flow rate 


l/h 

Pa/m 

1500 165.8 

1600 209.6 

2000 274.0 

2100 305.5 

2300 383.6 

2400 389.1 

2500 404.2 

2700 479.5 

PE pipe 50 × 4.6 mm, PN 10 

Flow rate 


l/h 

Pa/m 

1500 56.9 

1600 61.7 

2000 96.0 

2100 102.8 


2400 128.8 

2500 141.8 

2700 163.7 

3000 189.1 

3200 216.5 

3600 202.8 

3900 315.1 

4200 356.2 

5200 530.2 

5400 569.9 

5500 596.0 

6200 739.8 


7200 1000.1 

7800 1257.7 

9200 1568.7 


12600 2794.8 

15600 – 

18600 – 

PE pipe 63 × 5.8 mm, PN 10 

Flow rate 


l/h 

Pa/m 

1500 17.8 

1600 25.3 

2000 30.1 

2100 34.0 


2400 45.2 

2500 48.0 

2700 56.2 

3000 63.0 

3200 69.9 

3600 84.9 

3900 102.8 

4200 121.9 

5200 161.7 

5400 187.7 

5500 191.8 

6200 227.4 


7200 316.5 

7800 367.2 

9200 493.2 


12600 956.3 

15600 1315.2 

18600 1808.4 

5457 919 GB 



Volumes in PE pipes, PN 10 

External Ø pipe × wall DN Volume per m pipe 

thickness 

mm l 

20 × 2.0 15 0.201 

25 × 2.3 20 0.327 

32 × 3.0 (2.9) 25 0.531 

40 × 2.3 32 0.984 

40 × 3.7 32 0.835 

50 × 2.9 40 1.595 

50 × 4.6 40 1.308 

63 × 5.8 50 2.070 

63 × 3.6 50 2.445 

Pump output supplements (percentage) for operation with Tyfocor 

Note 

Circulation pump curves, see chapter "Primary pump". 

Design flow rate 

² A = ² water + f Q (in %) 

Design residual head 

H A = H water + f H (in %) 

Select the pump with the higher pump rates ² A and H A . 

Note 

The supplements only comprise the corrections for the circulation 

pumps. System curve or data corrections can be determined with the 

help of technical literature or information provided by the valve manufacturer. 

Viessmann heat transfer medium "Tyfocor" (ready-mixed for temperatures 

down to –15 °C) has a ethylene glycol volume ratio of 28.6 °% 

(calculated as 30 %). 

3 

Volume ratio ethylene glycol % 25 30 35 40 45 50 

At an operating temperature of 0 °C 

– f Q % 7 8 10 12 14 17 

– f H % 5 6 7 8 9 10 

At an operating temperature of +2.5 °C 

– f Q % 7 8 9 11 13 16 

– f H % 5 6 6 7 8 10 

At an operating temperature of +7.5 °C 

– f Q % 6 7 8 9 11 13 

– f H % 5 6 6 6 7 9 

3.7 Heat source for water/water heat pumps 

Groundwater 

Water/water heat pumps utilise the energy content of groundwater or cooling water. 

5457 919 GB 



B 

F 

E 

C 

F 

approx. 1.3 m 

D 

-12.0 m 

-14.0 m 

-15.0 m 

-16.0 m 

G 

H 

K 

A 

min. 5 m 

-11.0 m 

-14.0 m 

-15.0 m 

O 

3 

-20.0 m 

-21.0 m 

L 

M 

-23.0 m 

-24.0 m 

N 

A Flow limiter, well circuit 

B Primary pump (integrated subject to type) 

C To the heat pump 

D Frost stat, primary circuit 

E Heat exchanger, primary circuit 

F Well shaft 

G Supply pipe 

Water/water heat pumps achieve high performance factors. Groundwater 

offers an almost constant temperature of 7 to 12 °C all year 

round. Therefore the temperature level needs to be raised only a little 

higher (compared to other heat sources) in order for it to be able to be 

utilised for heating purposes. 

Depending on the design, the heat pump cools the groundwater by up 

to 5 K, although its consistency remains otherwise unchanged. 

■ On account of the costs for pumping systems, for detached houses 

and two-family homes, we recommend the pump groundwater from 

depths of not more than approx. 15 m (see the above diagram). For 

commercial or large scale systems pumping from even greater 

depths could still be viable. 

■ Maintain a distance of 5 m between the point of extraction (delivery 

well) and the point of re-entry (return well). Supply and return wells 

must be located in the line of flow of the groundwater to prevent a 

"flow short circuit". Construct the return well so that the water exits 

below the groundwater level. 

H Non-return valve 

K Well pump 

L Delivery well 

M Flow direction of the groundwater 

N Return well 

O Pressure pipe 

■ Due to fluctuating water quality, we generally recommend a system 

separation between wells and heat pump. 

■ The groundwater flow and return lines to/from the heat pump must 

be protected against frost and must slope towards the well. 

Calculating the required groundwater volume 

The required ground water flow rate depends on the heat pump output 

and the rate of ground water cooling. 

For the minimum flow rates, see the heat pump specification (e.g. 

minimum flow rate for Vitocal 300-G, type WW 121 = 5.2 m 3 /h). 

D 

Permits for a groundwater/water heat pump system 

This project requires permission from the "local water authority" [check 

local regulations]. 

Where buildings must be connected to the public water system, the 

utilisation of the groundwater as a heat source for heat pumps must 

be authorised by your local authority [check local regulations]. 

When sizing the primary pumps observe that higher flow rates result 

in increased internal pressure drop. 

Permits can be subject to certain stipulations. 

5457 919 GB 



Sizing the heat exchanger, primary circuit/separating heat exchanger 

10 °C 

8 °C 

Note 

Fill primary circuit with anti-freeze mixture (brine, min. –5°C). 

A 

B 

6 °C 4 °C 

A Water 

B Brine (antifreeze mixture) 

The operational reliability of a water/water heat pump improves when 

it is used with a primary circuit heat exchanger. Subject to the correct 

sizing of the primary pump and the optimum layout of the primary circuit, 

the coefficient of performance of the water/water heat pump will 

be reduced by a maximum of 0.4. 

We recommend the use of the threaded stainless steel plate heat 

exchanger from the Viessmann Vitoset pricelist (manufacturer: Tranter 

AG); see the following selection table. 

Selection list for plate heat exchangers for water/water heat pumps 

Heat pump Refrigerating Plate heat Flow rate 

Pressure drop 

capacity exchanger Well circuit Primary circuit Well circuit Primary circuit 

(threaded) 

Type kW Part no. m 3 /h m 3 /h kPa kPa 


WW 121 23.7 7248 338 5.09 5.44 20 25 

WW 129 31.4 7248 339 6.74 7.21 25 30 

WW 145 48.9 7199 407 10.49 11.23 20 30 


WW+BWS 

47.4 7199 407 10.17 10.88 20 30 

121+121 

WW+BWS 

62.8 7199 409 13.48 14.42 20 30 

129+129 

WW+BWS 

97.8 7199 410 20.99 22.46 20 30 

145+145 


WW+BWS 

55.1 7199 408 11.82 12.65 20 30 

121+129 

WW+BWS 

72.6 7199 409 15.58 16.67 20 30 

121+145 

WW+BWS 

129+145 

80.3 7199 410 17.23 18.44 20 30 

3 

Cooling water 

If cooling water from an industrial waste heat process is used as heat 

source for a water/water heat pump, observe the following: 

■ The water quality must be within the limit values (see "Basic principles", 

chapter "Heat recovery from groundwater", table "Resistance 

of copper soldered or welded stainless steel plate heat exchangers 

to substances contained in the water"). 

■ If the water quality falls outside these limits, use a stainless steel 

heat exchanger in the primary circuit (see table on page 45). Sizing 

is carried out by the manufacturer of the heat exchanger. 

■ The available amount of water must satisfy the minimum flow rates 

of the primary side of the heat pump (see specification). 

■ The max. inlet temperature for water/water heat pumps is 25 °C. 

With higher cooling water temperatures, low-end controllers (e.g. as 

offered by Landis & Staefa GmbH, Siemens Building Technologies) 

on the primary side of the heat pump must limit the max. inlet temperature 

to 25 °C by adding cool return water. 

Note 

The utilisation of cooling water is also possible in conjunction with a 

brine/water heat pump. The max. inlet temperature must 

then be limited to 25 °C as for the water/water heat pump. 

5457 919 GB 



A 

B 

C 

D 

F 

VL 

RL 

E 

RL 

H 

3 

K 

G 

A Overflow 

B Supply 

C Dirt trap (on-site) 

D Low-end controller and valve (on-site) 

E Primary pump 

F To the heat pump 

G Primary circuit heat exchanger (see page 45) 

H Circulation pump (≙ well pump) 

K Water container 

(min. 3000 litre capacity, on-site) 

3.8 Central heating/central cooling 


Minimum flow rate 

Heat pumps require a minimum heating water flow rate (see specification), 

which must be maintained. To ensure the minimum flow rate, 

install an overflow valve or low loss header in systems without a heating 

water buffer cylinder. 

Low loss header 

When using a low loss header, ensure that the flow rate on the heating 

circuit side is greater than the flow rate on the secondary side of the 

heat pump. 

To prevent a fault shutdown, the minimum flow rate 

of the low loss header must be 3 litres per kW rated heating output. 

The heat pump control unit treats a low loss header like a small heating 

water buffer cylinder. Therefore, configure the low loss header by 

means of the control unit settings as a heating water buffer cylinder. 

Systems with large water volumes 

Systems with large water volumes (for example, underfloor heating 

systems) can operate without a heating water buffer cylinder. In these 

heating systems, install an overflow valve at the heating circuit distributor 

of the underfloor heating system that is furthest away from the 

heat pump. This safeguards the minimum flow rate, even in sealed 

heating circuits. 

In conjunction with an underfloor heating system, install a temperature 

limiter as maximum temperature limiter (accessory, order no. 

7151 728 or 7151 729). 

Systems without heating water buffer cylinder 

To safeguard the minimum heating water flow rate (see specification), 

never install a mixer in the heating circuit. 

Note 

An additional circulation pump is then required. 

Heating circuit and heat distribution 

Different heating water flow temperatures are required depending on 

the heating system design. 

The heat pump reaches a maximum flow temperature of 60 °C. 

When using radiators or when modernising or replacing boilers, the 

heat pump can be used, subject to the max. flow temperature of 

60 °C being observed. 

The lower the selected maximum heating water flow temperature, the 

higher the seasonal performance factor of the heat pump. 

5457 919 GB 



90 

Flow temperature in °C 

80 

70 

65 

60 

50 

40 

30 

20 

E 

10 

+18 +14 +10 +2 0 -2 -10 -14 

Outside temperat. t A 

in °C 

A 

B 

C 

D 

F 

A Max. heating water flow temperature = 75 °C 

B Max. heating water flow temperature = 60 °C 

C Max. heating water flow temperature = 55 ºC, requirement for 

mono-mode operation of the heat pump 

D Max. heating water flow temperature = 35 ºC, ideal for monomode 

operation of the heat pump 

E Heating systems that are conditionally suitable for dual mode 

operation of the heat pump 

F Max. heat pump flow temperature = 60 ºC 

3 

Cooling operation 

Cooling mode is possible either with one of the available heating circuits, 

or with a separate cooling circuit (e.g. chilled ceilings or fan convectors). 

Operating modes 

Cooling operation via the heating circuits is carried out in the "Standard" 

and "Fixed value" operating modes. The separate cooling circuit 

is additionally cooled in "Reduced" and "DHW only" operating modes. 

The latter enables continuous cooling of a room, e.g. a warehouse 

during the summer months. 

The cooling output is subject to either weather-compensated control 

according to the heating or cooling curve, or room temperaturedependent 

control. 

Note 

For cooling mode in the following cases, a room temperature sensor 

must be installed and enabled: 

■ Weather-compensated cooling mode with room influence 

■ Room temperature-dependent cooling mode 

■ "Active cooling" 

A room temperature sensor must always be installed for a separate 

cooling circuit. 

Weather-compensated control 

In weather-compensated cooling mode, the set flow temperature is 

calculated from the relevant set room temperature and the current 

outside temperature (long-term average) according to the cooling 

curve. Their level and slope are adjustable. 

Standard operation 

The cooling output for the heating circuits is subject to either weathercompensated 

control according to the cooling curve, or room temperature-dependent 

control. 

Fixed value operation 

In "Fixed value" mode, the room is cooled with the minimum flow temperature. 

3.9 Systems with heating water buffer cylinder 

Heating water buffer cylinder operated in parallel 

5457 919 GB 

Systems with small water volumes 

For systems with small water volumes (for example, heating systems 

with radiators), use a heating water buffer cylinder to prevent excessive 

heat pump cycling (starting/stopping). 

Benefits of a heating water buffer cylinder: 

■ Bridging power-OFF periods: 

At peak times, heat pumps may be switched off by your local power 

supply utility, subject to your electricity tariff. A heating water buffer 

cylinder supplies the heating circuits even during this power-OFF 

period. 

■ Constant flow rate through the heat pump: 

Heating water buffer cylinders provide hydraulic separation of the 

flow in the secondary and heating circuits. For example, the flow rate 

in the secondary circuit remains constant even if the heating circuit 

flow rate is reduced via thermostatic valves. 

■ Longer heat pump operating times 



Because of the increased water volume of the heat source and the fact 

that it may have a separate shut-off facility, an additional (or larger) 

expansion vessel should be provided. 

Protect the heat pump in accordance with EN 12828 [or local regulations]. 

Note 

The flow rate of the secondary pump should be greater than that of the 

heating circuit pumps. 

Heating water buffer cylinder for optimised runtimes 

V HP = Q HP · (20 to 25 litres) 

Q WP = Absolute rated heat pump heating output 

V HP = Heating water buffer cylinder volume in litres 

Example: 

Type BW 110 with Q WP = 10.2 kW 

V HP = 10.2 · 20 litres = 204 litre cylinder capacity 

Selection: Vitocell 100-E with 200 litre capacity 

Note 

With two-stage heat pumps and heat pump cascades, the volume of 

the heating water buffer cylinder can be sized for runtime optimisation 

to match the highest possible rated heat pump heating output. 

3 

Heating water buffer cylinder for bridging periods when the supply is blocked 

This version is offered for heat distribution systems without additional 

cylinder mass (e.g. radiators, hydraulic fan convectors). 

Storing 100 % of heating energy for the duration of the power-OFF 

periods is feasible, but not recommended, otherwise cylinders would 

become too large. 

Example: 

Φ HL = 10 kW = 10000 W 

t Sz = 2 h (max. 3 x per day) 

Δϑ =10 K 

= 1.163 Wh/(kg∙K) for water 

c P 

V HP 

10000 W · 2 h 

= 

Wh =1720 kg 

1.163 kg · k · 10 k 

1720 kg water represent a cylinder capacity of approx. 1720 l. 

Selection: 2 Vitocell 100-E each with 1000 l capacity. 

Rough sizing 

(subject to the utilisation of the delayed building heat loss) 

V HP = Φ HL ∙ (60 to 80 l) 

c P Spec. thermal capacity in kWh/(kg ∙ K) 

Φ HL Heat load of the building in kW 

t Sz Period in h during which the supply is blocked 

V HP Heating water buffer cylinder volume in litres 

Δϑ System cool-down in K 

V HP 

V HP 

= 10 ∙ 60 l 

= 600 litre cylinder capacity 

Selection: 1 Vitocell 100-E with 750 litre cylinder capacity. 

100 % sizing 

(subject to the existing heating surfaces) 

V HP = 

Φ HL · 

c · Δ 

P 

t SZ 

3.10 Water quality 

Heating water 

Unsuitable fill and top-up water increases the level of deposits and 

corrosion and may lead to system damage. 

Regarding the quality and amount of heating water, incl. fill and top-up 

water, observe the VDI 2035 [or local regulations]. 

■ Thoroughly flush the entire heating system prior to filling it with water. 

■ Only use fill water of potable quality. 

■ Soften fill water with a hardness above 16.8 °dH (3.0 mol/m 3 ), e.g. 

with the small softening system for heating water (see the 

Viessmann Vitoset pricelist). 

5457 919 GB 



3.11 DHW heating 

DHW connection 

Example with Vitocell 100-V, type CVW 

Connection to DIN 1988. 

O 

H 

A 

B 

C 

D 

G 

K 

L 

M NF K 

K F P R K S O 

3 

E 

F 

A DHW 

B DHW circulation line 

C DHW circulation pump 

D Spring-loaded check valve 

E Expansion vessel, suitable for drinking water 

F Drain 

G Visible blow-off line outlet 

H Safety valve 

K Shut-off valve 

Information on potable water filter 

According to DIN 1988-2, a drinking water filter should be installed in 

systems with metal pipework. We also recommend the installation of 

a drinking water filter when using plastic pipes, as per DIN 1988, to 

prevent contaminants entering the DHW system. 

L Flow regulating valve 

(installation recommended) 

M Pressure gauge connector 

N Non-return valve 

O Cold water 

P Drinking water filter 

R Pressure reducer to DIN 1988-2 issue Dec,1988 

S Non-return valve/pipe separator 

Recommendation: Install the safety valve higher than the top edge of 

the cylinder. This protects the valve against contamination, scaling and 

high temperatures. The DHW cylinder does not then need to be 

drained when working on the safety valve. 

Safety valve 

Protect the DHW cylinder by means of a safety valve against undue 

excess pressure. 

Function description regarding DHW heating 

5457 919 GB 

Compared to central heating, DHW heating makes fundamentally different 

demands, as almost identical amounts of heat must be provided 

all the year round at the same temperature level. 

In the delivered condition, DHW heating by the heat pump takes priority 

over the heating circuits. 

The heat pump control unit switches the DHW circulation pump off 

during cylinder heating to prevent cylinder heating from being 

impaired. 

The max cylinder storage temperature is limited subject to the heat 

pump used and the individual system configuration. With a booster 

heater, storage temperatures above this limit are possible. 

Available booster heaters to reheat the DHW: 

■ External heat source 

■ Instantaneous heating water heater (on site) 

■ Immersion heater (on site) 

The integral load manager in the heat pump control unit decides which 

heat sources to use for DHW heating. Generally the external heat 

source has priority over the electric heaters. 

If one of the following criteria is met, the booster heaters begin cylinder 

heating: 

■ Cylinder temperature is below 3 °C (frost protection). 

■ Heat pump does not provide any heating output and actual temperature 

has fallen below set temperature at the top cylinder temperature 

sensor. 



Note 

The immersion heater in the DHW cylinder and the external heat 

source stop as soon as the set value at the top temperature sensor is 

reached, minus a hysteresis of 1 K. 

When selecting the DHW cylinder ensure that its indirect coil surface 

area is large enough for the purpose. 

DHW heating should ideally take place during the night after 22:00 h. 

This has the following advantages: 

■ The heat pump heating output is available for central heating during 

the daytime. 

■ Night tariffs can be utilised to the full. 

■ DHW cylinder heating and simultaneous drawing can be avoided. 

When using an external heat exchanger, the system may not always 

achieve the required draw-off temperatures because of the system 

design. 

Hydraulic connection, primary store system 

Cylinder with external heat exchanger (primary store system) 

DHW 

eU 

3 

eW 

eZ 

M 

eT 

W 

X 

eE 

eR 

eP 

KW 

W 

X 

DHW interface (see system examples) 

Solar interface or external heat source (see system examples) 

KW Cold water 

WW Domestic hot water 



eP DHW cylinder 

eW Cylinder temperature sensor 

eE Cylinder primary pump (DHW side) 

eR Plate heat exchanger 

eT Flow limiter 

eZ Motorised two-way valve, normally closed 

eU DHW circulation pump 

5457 919 GB 



Cylinder with external heat exchanger (primary store system) and heating lance 

WW 

L 

A 

B 

E 

G 

H 

C 

D 

KW 

K 

3 

KW Cold water 

WW Domestic hot water 

B DHW inlet from the heat exchanger 

L 

Heat pump interface 

Further explanations see the following table. 

During cylinder heating (no draw-off) in the primary store system, cold 

water from the bottom of the cylinder is drawn by cylinder primary 

pump E, heated in heat exchanger K and returned to the cylinder 

via heating lance A fitted into the flange. 

The generously sized outlet apertures in the heating lance result in low 

flow velocities, which in turn provide a clean temperature stratification 

inside the cylinder. 

DHW booster heating is possible if an additional immersion heater is 

installed (on site). 


Pos. Description Quantity Part no. 

A Heating lance 1 Z004 280 

C Cylinder temperature sensor 1 7170 965 

D Vitocell 100-L, (750 or 1000 litre capacity) 1 see Viessmann pricelist 

E Cylinder primary pump 1 7820 403 

or 

7820 404 

G Two-way motorised ball valve (N/C) 1 7180 573 

H Flow limiter 1 on-site 

K Plate heat exchanger Vitotrans 100 1 see Viessmann pricelist 

Selection, primary store system 

Primary store 

Primary store Capacity Optional booster heater Applications 

l 

Immersion heater (on site) Instantaneous heating 

water 

heater (on site, for preheated 

DHW) 

Vitocell 100-L, type CVL 750 x x up to 16 people 

1000 x x up to 16 people 

Plate heat exchanger Vitotrans 100 

Note 

Heat exchanger pressure drop values, see technical guides for DHW cylinders. 

5457 919 GB 



50 °C 

60 °C 

A 

B 

40 °C 42 °C 

A DHW cylinder (domestic hot water) 

B Heat pump (heating water) 

3 

Flow rate and pressure drop at B15/W35 °C 

Heat pump Heating output 

Flow rate Pressure drop Vitotrans 100 

A B A B 

Type kW m 3 /h m 3 /h kPa kPa Part no. 


BW 121 

31 2.70 2.70 14 15.5 3003 493 

WW 121 

BW 129 

41.2 3.60 3.60 24 26.7 3003 493 

WW 129 

BW 145 

WW145 

63.6 5.60 5.60 27.4 29.4 3003 494 

For higher DHW temperatures 

58 °C 

60 °C 

A 

B 

53 °C 55 °C 

A DHW cylinder (domestic hot water) 


Flow rate and pressure drop at B15/W35 °C 

Heat pump Heating Flow rate Pressure drop Vitotrans 100 

output A B A B 

Type kW m 3 /h m 3 /h kPa kPa Part no. 


BW 121 

31 5.35 5.35 26 27.9 3003 494 

WW 121 

BW 129 

41.2 7.11 7.11 25.3 26.5 3003 495 

WW 129 

BW 145 

WW 145 

63.6 10.97 10.97 34 35 on request 

Notes for BW 145, WW 145 

In combination with Vitocell 100-L, type CVL, the flow rate of 

10.97 m 3 /h cannot be reached. On-site DHW cylinder required. 

Cylinder primary pump curves 

See page 22. 

5457 919 GB 



3.12 Cooling operation 

Types and configuration 

Subject to system version the following cooling functions are possible: 

■ "Natural cooling" (as option with or without mixer) 

– The compressor is shut down and heat exchange occurs directly 

with the primary circuit. 

■ "Active cooling" 

– The heat pump is used as a refrigeration unit, meaning a higher 

cooling capacity is possible than with natural cooling. 

– This function is only possible outside a power-OFF period, and 

must be enabled separately by the system user. 

Even if active cooling is selected and enabled, the control unit will initially 

start the natural cooling function. If the set room temperature 

cannot be achieved with this function for a prolonged period, the compressor 

starts. 

A mixer can only be used with natural cooling, and particularly in cooling 

mode on underfloor heating circuits, it keeps the flow temperature 

above the dew point. To ensure the transfer of the high cooling output 

in active cooling at all times, no mixer is provided. 

Cooling function Natural cooling 

Function description 

With natural cooling, the heat pump control unit regulates the following 

functions: 

■ Switching all necessary circulation pumps, diverter valves and mixers 

■ Recording all essential temperatures 

■ Dew point monitoring 

The control unit enables the natural cooling function if the outside temperature 

exceeds the cooling limit (adjustable). Control operated in 

weather-compensated mode when cooling via heating circuit (underfloor 

heating circuit). When a separate cooling circuit is used, e.g. a 

fan convector, then the control is room temperature-dependent. 

DHW heating by the heat pump is possible during the cooling operation. 

■ Carry out the diffusion-proof thermal insulation of all brine and cold 

water lines in accordance with standard practice to prevent condensation. 

■ Power supply (1/N/PE, 230 V/50 Hz) is required. 

Recommendation: Utilise the heat pump power supply from an onsite 

power distribution board. 

The maximum refrigerating capacity that can be transferred depends 

on the geothermal probe/geothermal collector system and the ground 

temperatures. 

For cooling, it is possible to connect either a heating/cooling circuit, 

e.g. underfloor heating circuit or a separate cooling circuit, e.g. a fan 

convector. 

Components required: 

Circulation pumps, diverter valves, mixers, sensors and a KM BUS 

interface to the heat pump control unit. 

The heat extracted from the heating/cooling circuit is transferred to the 

ground by a heat exchanger. This heat exchanger is connected in series 

and enables a system separation between the primary and the 

heating circuit. 

Note 

Thermally insulate all lines on site with vapour diffusion-proof material. 

3 

Hydraulic connection, natural cooling function 

iI 

iU 

iT 

iZ 

iR 

M 

uE 

uR 

iE φ 

iW 

uP 

M iQ 

uQ 

A Geothermal probe interface 

B Interface to heat pump primary circuit 

C Interface to heat pump/heating water buffer cylinder (secondary 

circuit) 

M 

iO 

uZ 

uU M 

A 

B 

C 

5457 919 GB 





Natural cooling function (NC) 

Note 

All required components (with a suitably designed plate heat exchanger) for the cooling circuit must be provided on site. 

iQ 

iW 

iE 

iR 

iT 

iZ 

iU 

iI 

iO 

Three-way diverter valve 

Secondary cooling circuit pump 

Contact humidistat 

Primary cooling circuit pump 

Mixer motor - three-way mixer 

Frost stat 

Extension kit for NC 

Extension kit for heating circuit (cooling circuit) with mixer 

Motorised two-way valve, normally closed 

3 

Cooling with an underfloor heating system 

The underfloor heating system can be used for heating and for cooling 

buildings and rooms. 

Underfloor heating systems are integrated into the brine circuit via a 

cooling heat exchanger. A mixer is required to match the cooling load 

of the room to the outside temperature. Similar to a heating curve, the 

cooling capacity can be matched exactly to the cooling load via a cooling 

curve and the cooling circuit mixer that is regulated by the heat 

pump control unit. 

Surface temperature limits must be maintained to observe comfort criteria 

and to prevent condensation. The surface temperature of the 

underfloor heating system in cooling operation must not fall below 

20 °C. 

Install a natural cooling contact humidistat (for capturing the dew point) 

in the underfloor heating system flow to prevent condensation forming 

on the floor surface. This safely prevents the formation of condensate, 

even if weather conditions change quite rapidly (e.g.during a thunderstorm). 

The underfloor heating systems should be sized in accordance with a 

flow/return temperature pair of approx. 14/18 °C. 

The following table can assist in estimating the possible cooling 

capacity of an underfloor heating system. 

In principle, the following applies: 

The minimum flow temperature for cooling with an underfloor heating 

system and the minimum surface temperature are subject to the prevailing 

climatic conditions in the room (air temperature and relative 

humidity). These must therefore also be taken into consideration during 

the design phase. 

Estimating the cooling capacity of an underfloor heating system subject to floor covering and spacing between pipes (assumed flow 

temperature approx. 14 °C, return temperature approx. 18 °C; Source: Velta) 

Floor covering Tiles Carpet 

Spacing mm 75 150 300 75 150 300 

Cooling capacity with pipe diameter 

–10 mm W/m 2 45 35 23 31 26 19 

–17 mm W/m 2 46 37 25 32 27 20 

–25 mm W/m 2 48 40 28 33 29 22 

Details accurate for: 

Room temperature 25 °C 

Relative humidity 60 % 

Dew point temperature 16 °C 

Cooling with fan convectors Vitoclima 200-C (accessory) 

■ Cooling operation possible either via separate cooling circuit or via 

a heating/cooling circuit. For max. cooling capacity, select operating 

mode "Fixed value". 

■ Select an installation location where the heat pump can be easily 

connected. 

■ Consider the connection of the condensate drain to the domestic 

drainage system or routing the condensate to the outside of the 

building. 

■ Power supply (1/N/PE,230 V/50 Hz) required. 

■ When creating wall outlets, consider supports, lintels and sealing 

elements (e.g. vapour barriers). 

■ Only fit appliances to solid level walls. 

■ Never install appliances near heat sources or places subject to direct 

solar irradiation. 

■ Install appliances only in locations with good air circulation. 

■ Ensure easy accessibility for service. 

Output matching 

The output of fan convectors can be modified. By changing the terminal 

connections, 3 of the available 5 speeds can be assigned to the 

three-stage speed selector of the fan convectors. 

The heating and cooling capacities available with the respective 

speeds are shown in the following table. 

5457 919 GB 



Test conditions 

■ Cooling capacity: 

At 27 °C room temperature, 48% relative humidity, cooling the cooling 

water from 12 to 7 °C. 

■ Rated output: 

At 20 °C room temperature, flow temperature 50 °C. 

■ Sound pressure level 

Measured at a distance of 2.5 m with a room volume of 200 m 3 and 

a reverberation time of 0.5 s. 

Speed-dependent heating and cooling capacities 

Type Fan speed Air flow Cooling mode Heating mode Sound 

rate Total cooling 

capacity 

Sensible 

cooling 

Flow rate Pressure 

drop 

Heating 

output 

Flow rate Pressure 

drop 

pressure 

level 

capacity 

m 3 /h W W l/h kPa W l/h kPa dB(A) 

V1 292 1971 1518 338 42 2463 216 6 42 

V2 260 1846 1390 317 37 2370 208 5 38 

V202H V3 205 1543 1141 266 27 2102 184 4 32 

V4 163 1327 954 227 20 1812 159 3 25 

V5 122 1075 755 184 14 1470 129 2 23 

V1 524 3398 2663 583 31 4544 398 25 41 

V2 433 3007 2289 515 25 4227 371 22 36 

V203H V3 354 2560 1920 439 19 3732 327 17 31 

V4 323 2409 1784 414 17 3517 309 16 29 

V5 272 2128 1550 367 14 3207 281 13 26 

V1 843 5614 3770 961 40 6651 583 15 50 

V2 708 4836 3200 828 31 6091 534 13 45 

V206H V3 598 4289 2796 735 25 5614 493 11 41 

V4 545 3984 2581 684 22 5327 468 10 38 

V5 431 3305 2168 569 16 4589 403 8 31 

V1 1266 8833 6708 1516 38 11558 1014 48 55 

V2 983 7402 5464 1271 28 10251 899 38 48 

V209H V3 859 6491 4779 1113 22 9429 828 33 45 

V4 730 5537 4076 951 16 8141 714 25 42 

V5 612 4627 3407 792 12 6745 592 18 38 

3 

Factory-set fan speed 

Sizing the cooling heat exchanger 

The following tables can be used to calculate the size of the required 

cooling heat exchanger. 

Recommendation for sizing the cooling system correctly: calculate the 

cooling load to VDI 2078. 

Brine/water heat pumps 

13 °C 

20 °C 

A 

B 

10 °C 12 °C 

A Cooling circuit primary side (brine) 

B Cooling circuit secondary side (water) 

5457 919 GB 



List for selecting cooling heat exchanger for brine/water heat pump at brine 10/13 °C, cooling system 20/12 °C 

Heat pump 

Refrigerating Flow rate, cooling circuit Pressure drop, cooling circuit Part no. 

capacity Primary side (brine) Secondary side 

(water) 

Primary side 

(brine) 

Secondary 

side (water) 

Type kW m 3 /h m 3 /h kPa kPa 


BW 121 17.5 5.42 1.89 30 5 7438 712 

BW 129 23.8 7.38 2.56 30 5 7438 713 

BW 145 35 10.85 3.77 30 7 738 714 


BW+BWS 121+121 35 10.85 3.77 30 5 7438 714 

BW+BWS 129+129 47.6 14.76 5.13 30 5 7438 717 

BW+BWS 145+145 70 21.7 7.54 30 5 7438 719 


BW+BWS 121+129 41.3 12.8 4.45 30 5 7438 715 

BW+BWS 121+145 52.5 16.27 5.66 30 5 7438 716 

BW+BWS 129+145 58.8 18.23 6.33 30 5 7438 718 

3 

Water/water heat pumps 

14 °C 

22 °C 

A 

B 

10 °C 12 °C 

A Cooling circuit primary side (water) 

B Cooling circuit secondary side (water) 

List for selecting cooling heat exchanger for water/water heat pump at groundwater 10/14 °C, cooling system 22/12 °C 

Heat pump Refrigerating Flow rate, cooling circuit Pressure drop, cooling circuit Part no. 

capacity Primary side 

(water) 

Secondary side 

(water) 

Primary side 

(water) 

Secondary side 

(water) 

Type kW m 3 /h m 3 /h kPa kPa 


WW 121 23.7 5.01 2.04 30 7 7438 703 

WW 129 31.4 6.75 2.71 30 7 7438 704 

WW 145 48.9 10.52 4.22 30 7 7438 705 


WW+BWS 

47.4 10.2 4.09 30 7 7438 706 

121+121 

WW+BWS 

62.8 13.52 5.41 30 7 7438 709 

129+129 

WW+BWS 

97.8 21.04 8.43 30 7 7438 711 

145+145 


WW+BWS 

55.1 11.85 4.75 30 7 7438 707 

121+129 

WW+BWS 

72.6 15.62 6.26 30 7 7438 708 

121+145 

WW+BWS 

129+145 

80.3 17.27 6.92 30 7 7438 710 

3.13 Swimming pool water heating 

Hydraulic connection, swimming pool 

Swimming pool water heating is effected hydraulically via the changeover 

of a second three-way diverter valve (accessory). 

If the temperature falls below the value set at the swimming pool thermostat 

(accessory), a demand signal is sent to the heat pump control 

unit via the external extension H1 (accessory). In the delivered condition, 

central heating and DHW heating have priority over swimming 

pool water heating. 

5457 919 GB 



For more detailed information regarding systems with swimming pool 

water heating, see "Heat pump system examples". 

Sizing the plate heat exchanger 

28 °C 

38 °C 

Use only stainless steel heat exchangers (threaded) that are suitable 

for potable water for heating swimming pool water. 

Size the plate heat exchanger subject to the max. output and the temperature 

specified for the plate heat exchanger. 

22 °C 28 °C 

Note 

The flow rate calculated during sizing must be maintained during the 

installation. 

External swimming pool for average water temperatures up to 24 °C. 

A Swimming pool (swimming pool water) 


Selection list, plate heat exchangers for swimming pools 

Heat pump type Output in kW Flow rate in m 3 /h 

(for B15/W35) Swimming pool Heat pump (heating water) 


BW 121 

31 4.4 2.7 

WW 121 

BW 129 

41.2 5.9 3.5 

WW 129 

BW 145 

63.6 9.1 5.5 

WW 145 

Two-stage heat pump, both stages with the same output 

BW+BWS 121+121 

62 8.9 5.3 

WW+BWS 121+121 

BW+BWS 129+129 

82.4 11.8 7.1 

WW+BWS 129+129 

BW+BWS 145+145 

127.2 18.2 10.9 

WW+BWS 145+145 

Two-stage heat pump, stages with different output 

BW+BWS 121+129 

72.2 10.3 6.2 

WW+BWS 121+129 

BW+BWS 121+145 

94.6 13.6 8.1 

WW+BWS 121+145 

BW+BWS 129+145 

WW+BWS 129+145 

104.8 15.0 9.0 

3 

3.14 Connection of solar thermal systems 

5457 919 GB 

The installation of a Vitosolic solar control unit enables a solar thermal 

system to be controlled to provide DHW heating, central heating 

backup and swimming pool water heating. The heat-up priority can be 

selected individually at the heat pump control unit. 

Via the KM BUS certain values can be checked at the heat pump control 

unit. 

When there is a high level of insolation, all heat consumers can be 

heated to a higher set value, thereby raising the solar coverage. All 

solar temperatures and set values can be scanned and adjusted via 

the control unit. 

The operation of the solar thermal system will be suspended at collector 

temperatures > 120 °C to prevent steam hammer inside the solar 

circuit (collector protection function). 

Solar DHW heating 

The solar circuit pump starts and the DHW cylinder is heated up, if the 

temperature differential between the collector temperature sensor and 

the cylinder temperature sensor (in the solar return) is greater than the 

start temperature differential set at the solar control unit. 

The heat pump will be prevented from heating the cylinder if the temperature 

at the cylinder temperature sensor (in the DHW cylinder, top) 

exceeds the set value selected at the heat pump control unit. 

The solar thermal system heats the cylinder to the set value selected 

at the solar control unit. 

Note 

For the aperture area that can be connected, see the "Vitosol" technical 

guide. 

Solar central heating backup 

The solar circuit pump and the circulation pump for cylinder heating 

start, meaning the heating water buffer cylinder is heated up, if the 

temperature differential between the collector temperature sensor and 

the cylinder temperature sensor (solar) is greater than the start temperature 

differential selected at the heat pump control unit. 



Heating stops when the temperature differential between the collector 

temperature sensor and the cylinder temperature sensor (solar) is less 

than half the hysteresis (standard: 6 K) or when the temperature captured 

by the lower cylinder temperature sensor equals the selected set 

temperature. 

Solar swimming pool water heating 

See "Vitosol" technical guide. 

Sizing the solar expansion vessel 

Solar expansion vessel 

Construction and function 

With shut-off valve and mounting set. 

3 

A solar expansion vessel is a sealed unvented vessel where the gas 

space (nitrogen filling) is separated from the space containing liquid 

(heat transfer medium) by a diaphragm and the pre-charge pressure 

is subject to the system height. 

A Heat transfer medium 

B Nitrogen filling 

C Nitrogen buffer 

D Safety hydraulic seal min. 3 l 

E Safety water seal 

F Delivered condition (3 bar pre-charge pressure) 

G Solar thermal system filled, without heat effect 

H At maximum pressure and the highest heat transfer medium temperature 

Specification 

a 

a 

b 

b 

Expansion vessel Part no. Capacity Ø a b Connection Weight 

l mm mm kg 

A 7248 241 18 280 370 R ¾" 7.5 

7248 242 25 280 490 R ¾" 9.1 

7248 243 40 354 520 R ¾" 9.9 

B 7248 244 50 409 505 R1 12.3 

7248 245 80 480 566 R1 18.4 

Details regarding the calculation of the required volume see "Vitosol" 

technical guide. 


5457 919 GB

Heat pump control unit 

4.1 Vitotronic 200, type WO1A 

Structure and functions 

Modular structure 

The control unit is integrated into the heat pump. 

The control unit comprises a standard unit, electronics modules and a 

programming unit. 

Standard unit: 

■ ON/OFF switch 

■ Optolink laptop interface 

■ Operating and fault display 

■ Fuses 

Flow temperature 

Heating/cooling 

DHW 

Solar energy 

Information 

Select with 

40°C 

i 

Programming unit: 

■ Easy operation through: 

– Plain text display with graphic ability 

– Large font and black & white depiction for good contrast 

– Context-sensitive help 

– Integral control of the solar thermal system in heat pumps with 

solar connection 

– Removable programming unit; can be mounted on the wall with 

separate accessory 

■ With digital time switch 

■ Control keys for: 

– Navigation 

– Confirmation 

– Help 

– Extended menu 

■ Setting the: 

– Standard and reduced room temperature 

– Standard and second DHW temperature 

– Operating program 

– Time programs for central heating, DHW heating, DHW circulation 

and heating water buffer cylinder 

– Economy mode 

– Party mode 

– Holiday program 

– Heating and cooling curves 

– Codes 

– Actuator tests 

■ Displaying: 

– Flow temperature 

– DHW temperature 

– Information 

– Operating details 

– Diagnostic details 

– Information, warning and fault messages 

( 

Functions 

■ Weather-compensated control of flow temperatures for heating or 

cooling mode: 

– System flow temperature or flow temperature of heating circuit 

without mixer A1 

– Flow temperature heating circuit with mixer M1 

– Flow temperature of heating circuit with mixer M2 in conjunction 

with the extension kit for one heating circuit with mixer 

– Flow temperature, separate cooling circuit 

■ Electronic maximum and minimum temperature limit 

■ Demand-dependent shutdown of the heat pump and pumps for primary 

and secondary circuits 

■ Adjustment of a variable heating and cooling limit 

■ Anti-seizing pump protection 

■ Heating system frost protection 

■ Integral diagnostic system 

■ Cylinder thermostat with priority control 

■ Auxiliary function for DHW heating (short-term heating to a higher 

temperature) 

■ Control of a heating water buffer cylinder 

■ Control of an instantaneous heating water heater 

■ Screed drying program 

■ Control for swimming pool water heating in conjunction with external 

extension H1 (accessory) 

■ External hook-up: Mixer OPEN, mixer CLOSED, operating mode 

changeover 

■ External demand (set flow temperature adjustable) and heat pump 

blocking; set flow temperature specified via external 0 to 10 V signal 

(with external extension H1, accessory) 

■ Data communication: 

– Remote operation, remote setup and remote monitoring of the 

heat pump and heating system with Vitocom 300. Operation via 

the Vitodata 100 webserver integrated into the Vitocom, or via the 

central Vitodata 300 webserver with the additional option to configure 

all control parameters. 

Connection to the heat pump control unit via LON (with LON communication 

module, accessory) 

– Remote monitoring and remote operation via GSM phone networks 

with Vitocom 100 

Connection to the heat pump control unit via KM BUS 

The requirements of EN 12831 for calculating the heat load are met. 

To reduce the heat-up output, the "Reduced" operating status is 

switched to the "Standard" operating status if outside temperatures are 

low. 

According to the Energy Savings Order [Germany], the temperature in 

each room must be individually controlled, e.g. through thermostatic 

radiator valves. 

4 

5457 919 GB 

Time switch 

Digital time switch 

■ Individual and 7-day program 

■ Automatic summer/winter time changeover 


Heat pump control unit (cont.) 

■ Automatic function for DHW heating and DHW circulation pump 

■ Time, day and standard switching times for central heating, DHW 

heating, heating a heating water buffer cylinder and the DHW circulation 

pump are factory-set 

■ Switching times are individually programmable; up to 8 time phases 

per day 

Shortest switching interval: 10 minutes 

Power backup: 14 days 

Setting the operating programs 

The heating system frost protection (see frost protection function) 

applies to all heating programs. 

You can select the following operating programs with the program 

selectors: 

■ For heating/cooling circuits: 

Heating and DHW or heating, cooling and DHW 

■ For a separate cooling circuit: 

Cooling 

■ Only DHW; separate settings for each heating circuit 

The external operating program changeover is possible in conjunction 

with the external extension H1. 

Note 

If the heat pump is only required to operate for DHW heating, for 

example in summer, select operating program "Only DHW" for all 

heating circuits. 

■ Standby mode 

4 

Frost protection function 

■ The frost protection function will be started when the outside temperature 

falls below approx. +1 °C. 

With active frost protection, the heating circuit pump will be switched 

on and the boiler water is maintained at a lower temperature of 

approx. 20 °C. 

The DHW cylinder will be heated to approx. 20 °C. 

■ The frost protection function will be stopped when the outside temperature 

rises above approx. +3 °C. 

Heating and cooling curve settings (slope and level) 

The Vitotronic 200 regulates the flow temperatures for the heating circuits 

and cooling circuit in weather-compensated mode: 

■ System flow temperature or flow temperature of heating circuit without 

mixer A1 

■ Flow temperature heating circuit with mixer M1 

■ Flow temperature of heating circuit with mixer M2 in conjunction with 

the extension kit for one heating circuit with mixer 

■ Flow temperature, separate cooling circuit 

The flow temperature required to reach a specific room temperature 

depends on the heating system and the thermal insulation of the building 

to be heated or cooled. 

Adjusting the heating or cooling curves matches the flow temperatures 

to these conditions. 

■ Heating curves: 

The flow temperature of the secondary circuit is restricted at the 

upper end of the scale by the temperature limiter and the temperature 

set at the electronic maximum temperature limiter. 


90 

80 

70 

60 

50 

40 

30 

Heating curve slope 

3.4 

3.2 

3.0 

2.8 

2.6 

2.4 

2.2 

2.0 

1.8 

1.6 

20 

20 10 0 -10 -20 -30 

Outside temperature in °C 

1.4 

1.2 

1.0 

0.8 

0.6 

0.4 

0.2 

5457 919 GB 



■ Cooling curves: 

The flow temperature of the secondary circuit is restricted at the 

lower end of the scale by the temperature set at the electronic minimum 

temperature limiter. 

0.2 

0.4 

0.6 

0.8 

1.0 

1.2 

Outside temperature in °C 

35 30 25 20 

20 

1.4 1.6 

1.8 2.0 2.2 2.6 3.0 3.4 

Cooling curve slope 

15 

10 

5 

1 


Heating systems with heating water buffer cylinder or low loss header 

If using hydraulic separation, fit a temperature sensor in the heating 

water buffer cylinder or low loss header and connect to the heat pump 

control unit. 

Outside temperature sensor 

Installation location: 

■ North or north-western wall of the building 

■ 2 to 2.5 m above the ground, for multi-storey buildings in the upper 

half of the second floor 

Connection: 

■ 2-core lead, length max. 35 m with a cross-section of 1.5 mm 2 (copper). 

■ Never route this lead immediately next to 230/400 V cables. 

Specification 

IP rating IP 43 to EN 60529; 

ensure through appropriate 

design/installation 

Permissible ambient temperature during 

operation, storage and transport -40 to +70 °C 

4 

80 

41 

66 

5457 919 GB 

Specification Vitotronic 200, type WO1A 

General 

Rated voltage 230 V~ 

Rated frequency 

50 Hz 

Rated current 

6 A 

Protection class 

I 

Permissible ambient temperature 

– during operation 0 to +40 °C 

Installation in living spaces or boiler rooms (standard ambient conditions) 

– during storage and transport –20 to +65 °C 

Setting range for the DHW temperature 10 to +70 °C 

Heating and cooling curves setting range 

– Slope 0 to 3.5 

– Level –15 to +40 K 



4 

Connection values of the function components 

Components Connected load [W] Voltage [V] Max. switching current 

[A] 

Primary pump/well pump 200 230 4(2) 

Secondary pump 130 230 4(2) 

Instantaneous heating water heater control, stage 1 10 230 4(2) 

Circulation pump for cylinder heating (on the heating 130 230 4(2) 

water side) or three-way diverter valve, heating/DHW 

heating 

NC signal control ("natural cooling") 10 230 4(2) 

Circulation pump, separate cooling circuit 

10 230 4(2) 

and 

AC signal control (active cooling) 

Heating circuit pump A1 100 230 4(2) 

DHW circulation pump 50 230 4(2) 

External heat source control zero volt contact 250 4(2) 

Central fault message zero volt contact 250 4(2) 

Primary pump, heat pump stage 2 200 230 4(2) 

Secondary pump, heat pump stage 2 130 230 4(2) 

Instantaneous heating water heater control, stage 2 10 230 4(2) 

Circulation pump for cylinder heating (on the heating 130 230 4(2) 

water side) or three-way diverter valve, central/DHW 

heating for heat pump stage 2 

Cylinder primary pump (DHW side) 130 230 4(2) 

Circulation pump for DHW reheating 

100 230 4(2) 

or 

Control of immersion heater EHE 

Heating circuit pump M2 100 230 4(2) 

Total current max. 5(3) A 

4.2 Control unit accessories 

Contactor relay 

Part no. 7814 681 

Contactor in small casing. 

With 4 N/C and 4 N/O contacts. 

With terminal strip for earth conductors. 

Specification 

Coil voltage 

Rated current (I th ) 

230 V~/50 Hz 

AC1 16 A 

AC3 9 A 

180 

145 

95 

5457 919 GB 



Contact temperature sensor as system flow temperature sensor 

Part no. 7426 133 

For capturing the system flow temperature. 

Ø 15 

26 

Specification 

Lead length 

IP rating 

2.0 m 

IP 32 to EN 60529; ensure 

through appropriate design 

and installation 

Viessmann Pt500 

Sensor type 



– during storage and transport -20 to +70 °C 

Cylinder temperature sensor 

Part no. 7170 965 

For DHW cylinders and heating water buffer cylinders. 

On-site extension of the connecting lead: 

■ 2-core lead, length max. 60 m with a cross-section of 1.5 mm 2 (copper) 

■ Never route this lead immediately next to 230/400 V cables 

Specification 

Lead length 

IP rating 

3.75 m 


through design/installation 

Viessmann Pt500 

Sensor type 


– during operation 0 to +90°C 

– during storage and transport -20 to +70°C 

4 

Thermostat for controlling the swimming pool temperature 

Part no. 7009 432 

60 

98 

45 16 

61 

Specification 

Connection 

3-core cable with a crosssection 

of 1.5 mm 2 

Setting range 0 to 35 °C 

Switching differential 

0.3 K 

Breaking capacity 10(2) A 250 V~ 

Switching function 

with rising temperature 

from 2 to 3 

R 

3 2 

200 

1 

Stainless steel sensor well 

R½ x 200 mm 

Contact temperature sensor 

Part no. 7183 288 

For capturing the flow and return temperature. 

42 

40 

5457 919 GB 

76 



Specification 

Lead length 

IP rating 

5.8 m, fully wired 




Viessmann Ni500 

Sensor type 




Mixer motor 

Part no. 7450 657 

The mixer motor is mounted directly onto the Viessmann mixer DN 20 

to 50 and R ½" to 1¼". 

With system plug. 

For wiring on site. 

130 

180 

90 

Specification 



50 Hz 

Power consumption 

4 W 


II 

Protection 

IP 42 to EN 60529; safeguard 

through appropriate 

design and installation 




Torque 

3 Nm 

Runtime for 90° ∢ 

120 s 

4 

Extension kit for one heating circuit with mixer with integral mixer motor 

Part no. 7301 063 

KM BUS subscriber 

Components: 

■ Mixer PCB with mixer motor for Viessmann mixer DN 20 to 50 and 

R ½ to 1¼ 

■ Flow temperature sensor (contact temperature sensor), lead length 

2.2 m, fully wired, for specification see below 

■ Connecting plug for the heating circuit pump 

■ Power cable (3.0 m long) 

■ BUS cable (3.0 m long) 

The mixer motor is mounted directly onto the Viessmann mixer DN 20 

to 50 and R ½ to 1¼. 

Mixer PCB with mixer motor 


5.5 W 

IP rating IP 32D to EN 60529 




I 




Rated breaking capacity of the relay 

output for heating circuit pump sÖ 2(1) A 230 V~ 

Torque 

3 Nm 

Runtime for 90 ° ∢ 

120 s 

Flow temperature sensor (contact sensor) 

42 

180 

130 

60 

66 

Secured with a tie. 

160 

Specification 



50 Hz 

Rated current 

2 A 

Specification 




Sensor type 

Viessmann NTC 10 kΩ at 

25 °C 




5457 919 GB 



Extension kit for one heating circuit with mixer for separate mixer motor 

Part no. 7301 062 


For the connection of a separate mixer motor. 

Components: 

■ Mixer PCB for the connection of a separate mixer motor 

■ Flow temperature sensor (contact temperature sensor), lead length 


■ Connecting plug for the heating circuit pump 

■ Mixer motor terminals 

■ Power cable (3.0 m long) 

■ BUS cable (3.0 m long) 

Mixer PCB 


I 




Rated capacity of the relay outputs 

Heating circuit pump sÖ 2(1) A 230 V~ 

Mixer motor 0.1 A 230 V~ 

Required runtime of the mixer motor 

for 90° ∢ 

approx. 120 s 

Flow temperature sensor (contact sensor) 

42 

140 

60 

66 

58 

180 

Specification 



50 Hz 

Rated current 

2 A 


1.5 W 




Secured with a tie. 

Specification 




Sensor type 

Viessmann NTC 10 kΩ at 

25 °C 




4 

Immersion thermostat 

Part no. 7151 728 

May be used as a maximum temperature limiter for underfloor heating 

systems. 

The temperature limiter is installed into the heating flow and switches 

the heating circuit pump OFF if the flow temperature is too high. 

72 

130 

95 

Specification 

Lead length 




max. 11 K 

Breaking capacity 6(1.5) A 250 V~ 

Setting scale 

inside the casing 

Stainless steel sensor well 

R ½" x 200 mm 

DIN reg. no. DIN TR 116807 

or 

DIN TR 96808 

200 

5457 919 GB 

Contact thermostat 

Part no. 7151 729 

May be used as a maximum temperature limiter for underfloor heating 

systems (only in conjunction with metallic pipes). 

The temperature limiter is installed into the heating flow and switches 

the heating circuit pump OFF if the flow temperature is too high. 



72 

130 

95 

Specification 

Lead length 




max. 14 K 

Breaking capacity 6(1.5) A 250V~ 

Setting scale 

inside the casing 

DIN reg. no. DIN TR 116807 

or 

DIN TR 96808 

Vitotrol 200A 

4 

Part no. Z008 341 


A Vitotrol 200A can be used for each heating circuit in a heating system. 

Up to 2 remote controls may be connected to the control unit. 

Functions: 

■ Display of room temperature, outside temperature and the operating 

condition. 

■ Setting the standard room temperature (day temperature) and operating 

program via the standard display. 

Note 

The reduced room temperature (night temperature) is set at the control 

unit. 

Connection: 

■ 2-core lead, length max. 50 m (even if connecting several remote 

control units) 


■ LV plug as standard delivery 

20,5 

■ Party and economy mode can be enabled via keys 

■ Only for heating circuit with mixer: 

Room temperature sensor for room temperature hook-up 

Note 

For room temperature hook-up, the Vitotrol 200A must be installed 

in the living space (lead room). 

148 

97 

Installation location: 

■ Weather-compensated mode: 

Installation at any point in the building. 

■ Room temperature hook-up: 

Installation in the main living room on an internal wall opposite radiators. 

Never install inside shelving units, in recesses, or immediately 

by a door or heat source (e.g. direct sunlight, fireplace, TV set, etc.). 

The integral room temperature sensor captures the actual room 

temperature and effects any necessary correction of the flow temperature 

as well as a rapid heat-up at the start of the heating operation 

(if suitably encoded). 

Specification 

Power supply via KM BUS 


0.2 W 


III 







Set room temperature range 3 to 37 °C 

Room temperature sensor for separate cooling circuit 

Part no. 7408 012 

Installation in the room to be cooled on an internal wall, opposite radiators/heat 

sinks. Never install inside shelving units, in recesses, or 

immediately by a door or heat source (e.g. direct sunlight, fireplace, 

TV set, etc.). 

Connect the room temperature sensor to the control unit. 

5457 919 GB 



□80 

Connection: 

■ 2-core lead with a cross-section of 1.5 mm 2 (copper) 

■ Lead length from the remote control up to 30 m 


20 

Specification 


III 







KM BUS distributor 

Part no. 7415 028 

For the connection of 2 to 9 devices to the KM BUS. 

84 

130 

217 

Specification 

Cable length 


Protection IP 32 to EN 60529; 

safeguard through appropriate 

design and installation 




4 

External extension H1 

Part no. 7179 058 

Function extension inside a casing for wall mounting. 

Using the extension enables the following functions to be achieved: 

■ Cascade control for up to 4 Vitocal appliances 

■ Swimming pool water heating function 

■ Minimum boiler water temperature demand 

■ External blocking 

■ Set boiler water temperature specified via a 0-10 V input 

■ External heating program changeover 

84 

130 

217 

Specification 


Rated frequency 50 Hz 

Rated current 

4 A 


4 W 


I 

IP rating IP 32 



Installation in living spaces or 

boiler rooms 

(standard ambient conditions) 


5457 919 GB 

Vitocom 100, type GSM 

■ Without SIM card 

Part no. Z004594 

■ With contract SIM card for the operation of the Vitocom 100 via 

mobile phone 

Part no. Z004615 

Note 

For further information regarding the conditions of contract, see the 

Viessmann pricelist. 

Functions: 

■ Remote switching via GSM mobile phone networks 

■ Remote scanning via GSM mobile phone networks 

■ Remote monitoring via SMS to 1 or 2 mobile phones 

■ Remote monitoring of additional systems via digital input (230 V) 

Configuration: 

Mobile phones via SMS 

Standard delivery: 

■ Vitocom 100 (subject to order with or without SIM card) 

■ Power supply cable with Euro plug (2.0 m long) 

■ GSM aerial (3.0 m long), magnetic foot and adhesive pad 

■ KM BUS cable (3.0 m long) 



On-site requirements: 

Good reception for GSM communication of the selected mobile phone 

operator. 

Total length of all KM BUS subscriber cables up to 50 m. 

72 

130 

50 

Specification 

Rated voltage 230 V ~ 


50 Hz 

Rated current 

15 mA 


4 W 


II 

Protection 

IP 41 to EN 60529; safeguard 



Function Type 1B to EN 60 730-1 



Installation in living spaces or 

boiler rooms (standard ambient 

conditions) 


On-site connection 

Fault input DE 1 230 V~ 

4 

Vitocom 300, type FA5, FI2, GP2 

Part no: see current pricelist 

■ Type FA5 with integral analogue modem 

■ Type FI2 with integral ISDN modem 

■ Type GP2 with integral GPRS modem 

■ For up to 5 heating systems with one or more heat sources, with or 

without heating circuits downstream. 

In conjunction with Vitodata 300 

■ For remote reporting, remote monitoring and scanning of faults and/ 

or data points via the internet 

■ For remote switching, remote setting of parameters and codes for 

heating systems via the internet 

Configuration 

The Vitocom 300 is configured via the Vitodata 300. 

Fault messages 

Fault messages are reported to the Vitodata 300 server. These messages 

are transmitted via the following communication services from 

the Vitodata 300 server to the configured control devices: 

■ Fax 

■ Text messages (SMS) to mobile phones 

■ Email to PC/laptop 

On-site requirements: 

■ Telephone connection 

– Type FA5: 

TAE socket, coding "6N" 

– Type FI2: 

RJ45 socket (ISDN) 

■ Type GP2: 

Adequate GPRS radio signal for the D2 [Vodafone] mobile network 

at the location where the Vitocom 300 is installed 

■ LON communication module must be installed in the Vitotronic appliance 

Note 

For further information regarding the terms of contract, see the 

Viessmann pricelist. 

Standard delivery: 

■ Standard module *3 (with 8 digital inputs, 1 digital output and 2 analogue 

sensor inputs) 

– Type FA5: 

with integral analogue modem, 

Connecting cable for telephone socket TAE 6N, 2 m long 

– Type FI2: 

with integral ISDN modem, 

Connecting cable with RJ45 plug for ISDN socket, 3 m long 

– Type GP2: 

with integral GPRS modem, 

Aerial with connecting cable, 3 m long 

SIM card 

■ LON connecting cable RJ45 – RJ45, 7 m long, for data exchange 

between the Vitotronic and Vitocom 300 

■ Power supply unit *3 

■ Power cable from the power supply unit to the standard module 

Note 

For standard delivery of packs with Vitocom, see pricelist. 

Accessories: 

Accessories 

Part no. 

Wall mounting enclosure for the installation of the 

Vitocom 300 module, if no control panel or electrical 

distribution panel is available 

2 rows 7143 434 

3 rows 7143 435 

Extension module *3 

– 10 digital inputs (8 zero volt, two 230 V~) 

7143 431 

– 7 analogue inputs (2 can be configured as pulsed 

inputs) 

– 2 digital outputs 

– see the standard module for dimensions 

or 

– 10 digital inputs (8 zero volt, two 230 V~) 

7159 767 

– 7 analogue inputs (2 can be configured as pulsed 

inputs) 

– 2 digital outputs 

– 1 M BUS interface with connection of up to, for example, 

16 M BUS capable heat meters with M BUS slave 

interface to EN 1434-3 

– see the standard module for dimensions 

Uninterruptible power supply unit *3 (UPS) 7143 432 

*3 Mounting rail installation TS35 to DIN EN 50 022, 35 x 15 and 35 x 7.5. 

5457 919 GB 



Accessories 

Additional rechargeable battery pack *3 for UPS 

– Recommended with 1 basic module, 1 extension 

module and all inputs allocated 

– Required with: 1 standard module and 2 extension 

modules 

Extension of the connecting cable 

Installation spacing 7 to 14 m 

– 1 connecting cable (7 m long) 

and 

1 LON coupling RJ45 

Installation spacing 14 to 900 m with plug-in connector 

– 2 LON plug-in connectors RJ45 

and 

– 2-core cable, CAT5, screened, solid cable, AWG 

26-22, 0.13 to 0.32 mm 2 , external diameter, 

4.5 to 8 mm 

or 

2-core cable, CAT5, screened, wire, AWG 26-22, 

0.14 to 0.36 mm 2 , external diameter, 4.5 to 8 mm 

Installation spacing 14 to 900 m with socket 

– 2 connecting cables (7 m long) 

and 

– 2 LON sockets RJ45, CAT6 

– 2-core cable, CAT 5, screened 

or 

JY(St) Y 2 x 2 x 0.8 

Standard module (standard delivery): 

90 

160 

73 

Part no. 

7143 436 

7143 495 

and 

7143 496 

7199 251 

and 

on-site 

or 

on-site 

7143 495 

and 

7171 784 

on-site 

or 

on-site 

Specification 

Rated voltage 24 V – 

Rated current 

– Type FA5 600 mA 

– Type FI2 500 mA 

– Type GP2 500 mA 

Protection class II to DIN EN 61140 




Function 

Type 1B to 

EN 60730- 1 



Installation in living spaces 

or boiler rooms (standard 

ambient conditions) 


On-site connections: 

– 8 digital inputs DE 1 to DE 8 Zero volt contact, 2-pole, 

24 V–, max. 7 mA 

– 1 digital output DA1 Zero volt relay contact, 3- 

pole, changeover, 230 V~/ 

30 V–, max. 2 A 

– 2 analogue inputs AE 1 and AE 2 For Viessmann Ni500 temperature 

sensors, 10 to 127 

ºC ±0.5 K 

Power supply unit (standard delivery): 

90 

72 

58 

Specification 

Rated voltage 85 to 264 V ~ 


50/60 Hz 

Rated current 

0.55 A 

Output voltage 24 V – 

Output current 

1.5 A 

Protection class II to DIN EN 61140 




Potential separation 

primary/secondary SELV to EN 60950 

Electrical safety EN 60335 


– for operation with supply voltage U E -20 to +55 °C 

187 to 264 V 




– for operation with supply voltage U E 

100 to 264 V 

-5 to +55 °C 





For further technical details and accessories, see the data communication 

technical guide. 

4 

LON communication module 

Part no. 7172 173 

PCB for data exchange 

For connecting one Vitocom 200 or 300 to the heat pump control 

unit. 

5457 919 GB 

*3 Mounting rail installation TS35 to DIN EN 50 022, 35 x 15 and 35 x 7.5. 



LON connecting cable for data exchange between control units 

Part no. 7143 495 Cable length 7 m, fully wired (RJ 45). 

4 

Extension of the connecting cable 

■ Installation spacing 7 to 14 m: 

– 1 connecting cable (7 m long) 

Part no. 7143 495 

and 

– 1 LON coupling RJ45 

Part no. 7143 496 

■ Installation spacing 14 to 900 m with plug-in connector: 

– 2 LON plug-in connector RJ45 

Part no. 7199 251 

and 

– 2-core cable, CAT5, screened, solid cable, AWG 26-22, 0.13 to 

0.32 mm 2 , external diameter, 4.5 to 8 mm 

on-site 

or 

2-core cable, CAT5, screened, wire, AWG 26-22, 0.14 to 0.36 

mm 2 , external diameter, 4.5 to 8 mm 

on-site 

■ Installation spacing 14 to 900 m with sockets: 

– 2 connecting cables (7 m long) 

Part no. 7143 495 

and 

– 2 LON sockets RJ45, CAT6 

Part no. 7171 784 

– 2-core cable, CAT 5, screened 

on-site 

or 

JY(St) Y 2 x 2 x 0.8 

on-site 

and 

Terminator 

Part no. 7143 497 

2 pce 

To terminate the LON BUS at the first and last LON user. 

5457 919 GB 


Keyword index 

5457 919 GB 

A 

Active cooling...................................................................................53 

Air separator.....................................................................................12 

Application procedure (details).........................................................22 

B 

Brine accessory pack.......................................................................11 

Brine distributor 

■ Geothermal collectors...................................................................13 

■ Geothermal probes/geothermal collectors....................................14 

C 

Central heating/central cooling.........................................................46 

Connectable components................................................................33 

Connections on secondary side (two-stage heat pumps)................31 

Connections on the primary side (brine/water) 

■ Single stage heat pump................................................................26 

■ Two-stage heat pumps.................................................................26 

Connections on the primary side (water/water) 

■ Single stage heat pump................................................................28 

■ Two-stage heat pumps.................................................................29 

Contact thermostat...........................................................................65 

Cooling 

■ Selecting a plate heat exchanger..................................................55 

Cooling circuit...................................................................................47 

Cooling curve 

■ Level.............................................................................................60 

■ Slope.............................................................................................60 

Cooling function...............................................................................47 

■ Natural cooling..............................................................................53 

Cooling mode 

■ Operating modes..........................................................................47 

■ Weather-compensated control......................................................47 

Cooling operation.......................................................................47, 53 

■ Types and configuration................................................................53 

Cooling water...................................................................................45 

Cooling with an underfloor heating system......................................54 

Cooling with fan convectors.............................................................54 

D 

Data exchange.................................................................................69 

Delivered condition.............................................................................4 

DHW cylinder...................................................................................49 

DHW demand...................................................................................35 

DHW heating 

■ Connection on the DHW side........................................................49 

■ Selecting a plate heat exchanger..................................................51 

■ Selecting a primary store system..................................................51 

■ Solar..............................................................................................57 

■ Via an external heat exchanger....................................................22 

Dimensions........................................................................................7 

Diverter valve...................................................................................19 

Double U-shaped pipe probe...........................................................39 

Dual mode operation........................................................................35 

E 

Electrical connections......................................................................23 

Electrical demand.............................................................................22 

Electricity meter................................................................................23 

EnEV................................................................................................59 

Ethylene glycol.................................................................................36 

Expansion vessel 

■ Calculating the volume..................................................................58 

■ Primary circuit...............................................................................40 

■ Solar..............................................................................................58 

■ Structure, function, specification...................................................58 

External extension H1......................................................................67 

External heat source........................................................................35 

F 

Fan convectors...........................................................................19, 54 

Federal tariffs [Germany].................................................................22 

Fill water...........................................................................................48 

Flow rate..........................................................................................44 

Frost protection................................................................................36 

Frost protection function...................................................................60 

Function description 

■ DHW heating.................................................................................49 

■ Heating circuit...............................................................................46 

■ Heating water buffer cylinder........................................................47 

■ Instantaneous heating water heater..............................................35 

■ Power-OFF...................................................................................24 

G 

Geothermal collector 

■ Manifolds and headers..................................................................36 

■ Pressure drop...............................................................................38 

■ Sizing............................................................................................38 

Geothermal probe 

■ Pressure drop...............................................................................40 

■ Sizing............................................................................................40 

Groundwater....................................................................................43 

H 

Heat exchanger, primary circuit.......................................................45 

Heating circuit and heat distribution.................................................46 

Heating curve 

■ Level.............................................................................................60 

■ Slope.............................................................................................60 

Heating lance...................................................................................51 

Heating output..................................................................................34 

Heating water buffer cylinder...........................................................47 

Heating water flow temperature.......................................................46 

Heat load..........................................................................................34 

Heat pump control unit 

■ Functions......................................................................................59 

■ Programming unit..........................................................................59 

■ Standard unit.................................................................................59 

■ Structure.......................................................................................59 

Heat pump sizing.............................................................................34 

Heat transfer medium.................................................................16, 43 

Hydraulic connection 

■ Cooling function............................................................................53 

■ Primary store system....................................................................50 

Hydraulic connections......................................................................26 

Hydraulic connection set..................................................................48 

I 

Immersion thermostat......................................................................65 

Installation accessories 

■ Primary circuit...............................................................................11 

■ Secondary circuit..........................................................................17 

Instantaneous heating water heater.................................................35 

K 

KM BUS distributor...........................................................................67 

L 

LON..................................................................................................69 

LON communication module............................................................69 


Keyword index 

M 

Minimum clearances........................................................................23 

Mixer extension 

■ Integral mixer motor......................................................................64 

■ Separate mixer motor...................................................................65 

Mixer extension kit 

■ Integral mixer motor......................................................................64 

■ Separate mixer motor...................................................................65 

Mono-energetic operation................................................................35 

Mono-mode operation......................................................................34 

Motorised ball valve...................................................................19, 22 

N 

Natural cooling.................................................................................53 

O 

Operation 

■ Dual mode.....................................................................................35 

■ Mono-energetic.............................................................................35 

■ Mono-mode...................................................................................34 

Output diagrams.................................................................................8 

Output matching, fan convectors.....................................................54 

Outside temperature sensor.............................................................61 

Oversizing........................................................................................34 

P 

Positioning........................................................................................22 

Power-OFF...........................................................................22, 34, 48 

Power-OFF period......................................................................22, 48 

Power-OFF time...............................................................................34 

Power supply....................................................................................22 

Power tariffs.....................................................................................22 

Pressure drop in the pipework.........................................................41 

Primary pump...................................................................................12 

Product information............................................................................4 

Pump output supplements...............................................................43 

T 

Technical connection requirements.................................................23 

Temperature sensor 

■ Outside temperature.....................................................................61 

■ Room temperature..................................................................19, 66 

Thermostat 

■ Contact temperature.....................................................................65 

■ Immersion temperature.................................................................65 

Time switch......................................................................................59 

Tyfocor.............................................................................................43 

U 

Underfloor heating............................................................................54 

V 

Vitocom 

■ 100, type GSM..............................................................................67 

■ 300, type FA5, FI2, GP2...............................................................68 

Vitotrol..............................................................................................66 

Volumes in pipes..............................................................................43 

W 

Wall clearances................................................................................23 

Water Board.....................................................................................39 

Water quality....................................................................................48 

Weather-compensated control.........................................................47 

■ Operating programs......................................................................60 

Weather-compensated control unit 

■ Frost protection function...............................................................60 

R 

Required equipment.............................................................26, 50, 54 

Return well.......................................................................................44 

Room temperature sensor.........................................................19, 66 

S 

Safety equipment block....................................................................18 

Secondary pump..............................................................................17 

Sizing the heat pump.......................................................................34 

Sizing the heat source 

■ Brine/water heat pumps................................................................36 

■ Water/water heat pumps...............................................................43 

Solar central heating backup............................................................57 

Solar DHW heating..........................................................................57 

Solar expansion vessel....................................................................58 

Solar swimming pool water heating.................................................58 

Solar thermal system.......................................................................57 

Specification.......................................................................................5 

Standard delivery...............................................................................4 

Standard heat load of the building...................................................34 

Supplement for DHW heating..........................................................35 

Supplement for setback mode.........................................................36 

Supply well.......................................................................................44 

Swimming pool water heating..........................................................56 

System separation...........................................................................44 

System versions...............................................................................33 

5457 919 GB 


5457 919 GB 



5457 919 GB 


Printed on environmentally friendly, 

chlorine-free bleached paper 

Subject to technical modifications. 

Viessmann Werke GmbH&Co KG 

D-35107 Allendorf 

Telephone: +49 6452 70-0 

Fax: +49 6452 70-2780 

www.viessmann.com 

Viessmann Limited 

Hortonwood 30, Telford 

Shropshire, TF1 7YP, GB 

Telephone: +44 1952 675000 

Fax: +44 1952 675040 

E-mail: info-uk@viessmann.com 

5457 919 GB

Vitocal 300-G Technical Guide1.4 MB - Viessmann

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