Akva Vita TD - Danfoss.com

Akva Vita TD
Direct substation for one-family, semi-detached and terraced houses as well
as apartments
District heating substation for direct heating and instantaneous domestic hot water. Designed for
wall-mounting.
Application
The Akva Vita TD is a substation featuring high
performance and simple operation. Akva Vita
TD is especially suitable for two-pipe systems
and for decentralized systems in large apart-
ment houses.
District heating (DH)
The substation is prefabricated with intercon-
necting components such as differential pres-
sure control, fitting piece and sensor pockets
for insertion of a heat meter as well as strainers,
ball valves and pockets for pressure gauges.
Heating (HE)
The heating side is designed for direct genera-
tion of heat in a 2-pipe system. The differential
pressure control sets the optimum operation
conditions for radiator thermostatic valves in
order to enable individual temperature con-
trol in each room. In order to enable a time-
depending temperature control program, a
zone valve with actuator and a room thermo-
stat can be included as an option.
VC.LA.H1.02 © Danfoss 11/2004
Domestic hot water (DHW)
The DHW is prepared in the heat exchanger
based on the flow principle. Supreme ease of
operation is obtained via hydraulic regulation
of DHW through a proportional valve - the PM
controller, thereby guaranteeing a constant
DHW temperature at all times. The use of
hydraulic regulation largely prevents the for-
mation of lime scale and bacteria, due to the
fact that the valve closes immediately when
tapping is ended. A thermostatic by-pass en-
ables tapping of hot water without any delay,
- ensuring the best possible efficiency and
economy. The cold water connection includes
a combined ball valve/non-return valve and
safety valves.
Domestic hot water circulation
The Akva Vita TD is equipped with by-pass
function as a standard, but it is prepared for
DHW circulation. Switching to DHW circula-
tion is possible from a constructional point of
view, requiring no extra components.
Construction
All pipes are made of stainless steel. The con-
nections are made by nuts and gaskets. The
Akva Vita TD can be delivered with anthracite
grey-lacquered frame and with slightly curved
front panel in either brushed or white-lac-
quered stainless steel.
FEATURES AND BENEFITS
• Substation for district heating
• Direct heating, DHW heating based on
flow principle
• Capacity: 20 kW heating, 35 kW domestic
hot water
• Maximum hot water comfort supply
• Minimum space required for installation
• Pipes and plate heat exchanger made
of stainless steel
• Minimized risk of lime scale and bacteria
formation

Akva Vita TD
Circuit diagram - example
Technical parameters:
Nominal pressure: PN 16
DH supply temperature: T max = 120°C*
DCW static pressure: p min = 2,5 bar
Chloride compounds: Max. 300 mg/l
*At DH supply temp. above 90°C it is recommended to
order the Akva Vita TD equipped with an additional thermostatic
controller.
Weight incl. cover: 27,0 kg
(incl. packing)
Cover: Brushed or whitelacquered
stainless
steel
Dimensions (mm):
Without frame and front panel:
H 640 x W 450 x D 290
DHW: Capacity examples, 10°C/50°C
DHW
Capacity
kW
Plate
heat exchanger
Supply
flow
Primary
°C
Return
flow
Primary
°C
With frame and front panel:
H 640 x W 500 x D 330
Connections:
1 District heating (DH) supply
2 District heating (DH) return
3 Domestic cold water (DCW)
4 Circulation
5 Domestic hot water (DHW)
6 Heating (HE) supply
7 Heating (HE) return
DHW
Tap load
l/min.
Pressure
loss
Primary
*bar
Flow rate
Primary
l/h
35 WP22-22 60 35 12,5 0,55 1220
35 WP22-22 70 28 12,5 0,19 724
35 WP22-22 80 24 12,5 0,11 540
35 WP22-22 90 21 12,5 0,07 436
* Heat meter not incl.
2 Plate heat exchanger DHW
4 Differential pressure controller
5 Strainer
5A Strainer (fitted in T-piece)
6 Non-return valve
7 Ball valve
12 Safety valve DHW
13 Thermometer
14 Pocket for pressure gauge
23 Sensor pocket for heat meter
24 Flexible fitting piece for heat
meter
Heating: Capacity examples
Danfoss Redan A/S · District Heating Controls · Sindalsvej 33-35 · DK-8240 Risskov · Denmark
Phone: +45 87 43 89 43 · Fax: +45 87 43 89 44 · redan@danfoss.com · www.redan.danfoss.dk
24A Leak control
38 PM controller
40 Thermostat for by-pass/circulation
43 Blind plate
---------------
62 Non-return valve (optional)
64 Circulation pump DHW (optional)
Connections sizes:
DH: G ¾” (ext. thread)
DCW + DHW + HE: G ¾” (int. thread)
Circulation: R ½” (ext. thread)
Options:
• Flexible fitting piece for heat meter with
1” instead of ¾” connections
• Additional fitting piece for heat meter in
primary flow
• Circulation pump
• Zone valve with actuator
time-depending temperature control)
• Room thermostat (time-depending temperature
control)
• Without cover, or frame and front panel
• With white-lacquered steel sheet cover
• With additional thermostatic controller
Heating Heating circuit, ∆t Pressure loss Flow rate
Capacity Primary Secondary Primary primary
kW °C
°C
*bar
l/h
10 20 20 0,24 428
10 30 30 0,16 288
10 40 40 0,14 216
15 20 20 0,44 644
15 30 30 0,24 428
15 40 40 0,18 324
20 20 20 0,72 860
20 30 30 0,36 572
20 40 40 0,24 428
* Heat meter not incl.
VC.LA.H1.02 © Danfoss 11/2004 DH-SMT-PL