Vitocell Technical Guide - Viessmann

viessmann.co.uk

Vitocell Technical Guide - Viessmann

VIESMANNVITOCELLDHW cylinder andprimary store systemsTechnical guideVITOCELLCentral DHW heatingwith Viessmann DHW cylinders5414 646 GB 6/2009


IndexIndex1. Sizing systems for DHW heating 1.1 Principles ...................................................................................................................... 4■ General ..................................................................................................................... 4■ Irregular DHW demand ............................................................................................. 4■ Constant DHW demand ............................................................................................ 4■ High DHW demand ................................................................................................... 4■ Calculation program EDIS ........................................................................................ 4■ Hydraulic connection ................................................................................................. 42. Product information 2.1 Product description ....................................................................................................... 5■ Vitocell 100-H (type CHA) ......................................................................................... 5■ Vitocell 300-H (type EHA) ......................................................................................... 5■ Vitocell 100-V (type CVA) ......................................................................................... 5■ Vitocell 100-V (type CVW) ........................................................................................ 5■ Vitocell 300-V (type EVA) ......................................................................................... 5■ Vitocell 300-V (type EVI) ........................................................................................... 5■ Vitocell 100-W, (type CWG) ...................................................................................... 6■ Vitocell 100-W, (type CUG) ....................................................................................... 6■ Vitocell 100-L (type CVL) and Vitotrans 222 ............................................................. 6■ Vitocell 100-B (type CVB) / Vitocell 100-U (type CVU) ............................................. 6■ Vitocell 300-B (type EVB) ......................................................................................... 6■ Vitocell 340-M/360-M (type SVKA/SVSA) ................................................................. 62.2 Overview of product features ........................................................................................ 73. Selecting the cylinder type 3.1 Selection according to N L factor ................................................................................... 7■ Vitocell 100 selection diagram .................................................................................. 8■ Vitocell 300 selection diagram .................................................................................. 93.2 Selection according to continuous output ..................................................................... 9■ Table for selection according to continuous output ................................................... 104. Sizing 4.1 Sizing according to peak draw-off rate and DIN 4708-2 ............................................... 11■ Calculating the heat demand for DHW heating in residential buildings .................... 11■ Calculating the applicable draw-off demand per draw-off point to be considered .... 12■ Calculating the demand factor N ............................................................................... 12■ Boiler supplement Z K ................................................................................................ 14■ Calculating the heat demand for DHW heating in commercial operations ................ 15■ Calculating the heat demand for DHW heating in hotels, guest houses and residentialhomes ....................................................................................................................... 16■ Calculating the heat demand for DHW heating in commercially utilised sauna operation.......................................................................................................................... 16■ Calculating the heat demand for DHW heating for leisure/sports centres ................ 17■ Calculating the heat demand for DHW heating in connection with district heatingsystems ..................................................................................................................... 184.2 Sizing according to continuous output .......................................................................... 18■ Determining the required DHW cylinder, example 1 (with constant flow temperatures)......................................................................................................................... 18■ Determining the required DHW cylinder, example 2 (with a fixed heat source temperaturedifferential) .................................................................................................. 195. Primary store systems — Vitocell100-L with Vitotrans 2225.1 Applications and advantages ........................................................................................ 205.2 Function description of the primary store system ......................................................... 21■ Operation with modulating flow temperature ............................................................ 21■ Operation with constant flow temperature ................................................................ 22■ Operation with a heat pump in conjunction with a heating lance for DHW heating .. 225.3 General formulae for calculating the primary store system .......................................... 235.4 Sample calculation ........................................................................................................ 23■ Calculation of the cylinder size based on water volume ........................................... 24■ Calculation of the cylinder size based on heat volume ............................................. 246. Installation — DHW cylinders 6.1 Connections on the DHW side ...................................................................................... 24■ Vitocell 100-H and 300-H to 200 litre capacity .......................................................... 25■ Vitocell 300-H from 350 litre capacity ....................................................................... 26■ Vitocell 100-V and 300-V .......................................................................................... 26■ Connection on the DHW side of cylinder banks with Vitocell 300-H ......................... 276.2 DHW circulation lines .................................................................................................... 285414 646 GB2 VIESMANN VITOCELL


Index (cont.)6.3 Connection of the DHW circulation line with cylinder banks ......................................... 28■ Installing the Vitocell 300-H as cylinder bank ........................................................... 29■ Installing the Vitocell 300-H as cylinder bank ........................................................... 29■ Installing the Vitocell 100-V and 300-V as cylinder bank .......................................... 30■ Installing the Vitocell 100-V and 300-V as cylinder bank .......................................... 306.4 Connection on the heating water side .......................................................................... 31■ Connection on the heating water side ....................................................................... 31■ Connection on the heating water side with restriction of the return temperature ...... 346.5 Sensor wells ................................................................................................................. 357. Installation — primary store system7.1 DHW connection ........................................................................................................... 37■ Version 1 — primary store system with one Vitocell 100-L and Vitotrans 222 formodulating flow temperatures ................................................................................... 37■ Version 2 — primary store system with several Vitocell 100-L in parallel and Vitotrans222 for modulating flow temperatures ....................................................................... 38■ Version 3 — primary store system with several Vitocell 100-L in parallel and Vitotrans222 for constant flow temperatures ........................................................................... 39■ Version 4 — primary store system with several Vitocell 100-L in series and Vitotrans222 for modulating flow temperatures ....................................................................... 407.2 Connections .................................................................................................................. 41■ Connection of the Vitotrans 222 (accessory) on the DHW side in conjunction withone Vitocell 100-L ..................................................................................................... 41■ Connections on the heating water side ..................................................................... 427.3 Sample applications ...................................................................................................... 42■ Primary store systems under various connection conditions .................................... 42■ Sample application 1 – Vitocell 100-L with Vitotrans 222 and boiler with Vitotronic . 43■ Sample application 2 – Vitocell 100-L with Vitotrans 222 and a third party controlunit ............................................................................................................................ 44■ Sample application 3 – Vitocell 100-L with Vitotrans 222 and constant flow temperatures........................................................................................................................ 458. Appendix 8.1 Questionnaire regarding the sizing of DHW cylinders .................................................. 47■ DHW cylinders in DHW heating systems .................................................................. 478.2 Checklist for heat exchanger enquiries/sizing .............................................................. 49■ Purpose: Water/water ............................................................................................... 498.3 Checklist for heat exchanger enquiries/sizing .............................................................. 49■ Purpose: Steam/water .............................................................................................. 499. Keyword index .............................................................................................................................................. 505414 646 GBVITOCELL VIESMANN 3


1Sizing systems for DHW heating1.1 PrinciplesGeneralWhen sizing DHW heating systems, two main principles must be takeninto consideration: For reasons of hygiene, it is important to size thevolume of the DHW heating system so that it is as small as possible.However, for reasons of convenience, it should be as large asrequired. This means that the system must be configured as accuratelyas possible.Irregular DHW demandFor buildings with irregular demand, e.g. schools, commercial operations,hotels or sports complexes with shower facilities, sizing is oftencarried out via the peak output/maximum draw-off rate over 10minutes. It is important to ensure here that the DHW heating systemis not oversized, but also to consider the heat-up time for the DHWcylinder until the next peak in demand occurs.Constant DHW demandFor applications where there is constant demand for DHW, for exampleoperations that prepare food or swimming pools, the DHW heatingsystem is sized according to the constant demand of the consumer(continuous output). The size of the heat exchanger and the availableheating output are crucial factors.High DHW demandFor extremely high demand, sizing of the DHW heating system accordingto both the peak output and the continuous output is recommended.This applies in particular to primary store systems.Calculation program EDISFor reliable sizing of DHW heating systems, Viessmann provides freesoftware EDIS, which can be used for calculations for both residentialbuildings (in accordance with DIN 4708-2) and non-residential buildingssuch as hotels, barracks and industrial operations. Various complementarycalculation processes are used.Hydraulic connectionIn addition to the sizing of the DHW cylinder, the hydraulic connectionand the operation of the entire system for DHW heating is alsoextremely important for reliable and safe operation of the DHW heatingsystem.Above all, the selection of the correct operating temperature and thedesign of the DHW circulation line, as well as its connection to theDHW cylinder are extremely important for the hygienic operation of theDHW heating system. The applicable standards and laws must beobserved.In practice, various approaches are taken: For residential buildings,systems are often configured in accordance with DIN 4708 Part 2.Taking into account the sanitary amenities of the individual apartments/residentialunits, the occupancy/user rate and utilisation factors,the demand factor N can be determined.It is therefore also important to identify the available heating and transferoutput and to ensure that the DHW can be adequately heated inthe time between the peaks in demand.Sizing according to the continuous output is also practical whenspecial consideration must be given to the return temperatures of theheating system (e.g. district heating systems).Particular reference is made to DVGW Code of Practice W 551, TRWI(DIN 1988) and the valid Drinking Water Order (TrinkwV) and/or theDirective 98/83/EC of the Council of the European Union.5414 646 GB4 VIESMANN VITOCELL


Product information2.1 Product descriptionVitocell 100-H (type CHA)130, 160 and 200 litre capacity, horizontal, enamelled, internalindirect coilsHorizontal DHW cylinder with internal indirect coil.Cylinder and internal indirect coils made from steel, corrosion protectionthrough Ceraprotect enamel coating and protective magnesiumanode.The cylinders feature all-around rigid polyurethane foam insulationenclosed within an epoxy resin-coated sheet steel casing with a Vitosilverfinish.Vitocell 300-H (type EHA)2160, 200, 350 and 500 litre capacity, horizontal, made from stainlesssteel, internal indirect coilsHorizontal DHW cylinder made from high-alloy stainless steel withinternal indirect coil.The cylinders feature all-around rigid polyurethane foam insulationenclosed within an epoxy resin-coated sheet steel casing with a Vitosilverfinish.Cylinder banksVitocell 300-H, 350 and 500 litre capacity can be combined to formcylinder banks with on-site manifolds/headers for the heating waterand DHW sides (700 l, 1000 l, 1500 l).The DHW cylinders are supplied as individual units for easy installationand handling.Vitocell 100-V (type CVA)160, 200 and 300 litre capacity, vertical, enamelled, internal indirectcoilsVertical DHW cylinder with internal indirect coil.Cylinder and internal indirect coils made from steel, corrosion protectionthrough Ceraprotect enamel coating and protective magnesiumanode.The DHW cylinders feature all-around rigid polyurethane foam insulationenclosed within an epoxy resin-coated sheet steel casing with aVitosilver or white finish (Vitocell 100-W).500, 750 and 1000 litre capacity, vertical, enamelled, internal indirectcoilsVertical DHW cylinder with internal indirect coil.Cylinder and internal indirect coils made from steel, corrosion protectionthrough Ceraprotect enamel coating and protective magnesiumanode.The DHW cylinders feature all-around plastic-coated flexible polyurethanefoam insulation in Vitosilver. The removable thermal insulationis supplied separately.Cylinder banksVitocell 100-V, 300 to 1000 litre capacity can be combined with headers/manifoldsto form cylinder banks (600 l, 1000 l, 1500 l, 2000 l,3000 l). Ready to fit headers/manifolds for the heating water and DHWside are available for cylinders up to 500 litre. For cylinders with 750and 1000 litre capacity, headers/manifolds need to be provided onsite.The DHW cylinders are supplied as individual units for easy installationand handling.Vitocell 100-V (type CVW)390 litre capacity, vertical, enamelled, internal indirect coilsVertical DHW cylinder with large internal indirect coil, specially forDHW heating in conjunction with heat pumps.Cylinder and internal indirect coils made from steel, corrosion protectionthrough Ceraprotect enamel coating and protective magnesiumanode.The DHW cylinders feature all-around plastic-coated flexible polyurethanefoam insulation in Vitosilver. The removable thermal insulationis supplied separately.Vitocell 300-V (type EVA)130, 160 and 200 litre capacity, vertical, made from stainless steel,peripheral indirect coilVertical DHW cylinder with components on the DHW side made fromhigh-alloy stainless steel with peripheral indirect coil.The cylinders feature all-around rigid polyurethane foam insulationenclosed within an epoxy resin-coated sheet steel casing with a Vitosilverfinish.The Vitocell 300-V with 160 and 200 litre capacity are also availablein white (Vitocell 300-W).Vitocell 300-V (type EVI)5414 646 GB200 and 300 litre capacity, vertical, made from stainless steel,internal indirect coilVertical DHW cylinder made from high-alloy stainless steel with internalindirect coil.The DHW cylinders feature all-around insulation enclosed within anepoxy resin coated sheet steel casing in a Vitosilver finish.500 litre capacity, vertical, made from stainless steel, internalindirect coilVertical DHW cylinder made from high-alloy stainless steel with internalindirect coil.The DHW cylinders feature all-around plastic-coated flexible polyurethanefoam insulation in Vitosilver. The removable thermal insulationis supplied separately.VITOCELL VIESMANN 5


Product information (cont.)Cylinder banksThe Vitocell 300-V with 300 and 500 litre capacity can be combinedinto cylinder banks with manifolds/headers for the heating water andDHW sides. Ready to fit headers/manifolds are available.The DHW cylinders are supplied as individual units for easy installationand handling.2Vitocell 100-W, (type CWG)80 litre capacity, wall mounted, enamelled, internal indirect coilsWall mounted DHW cylinder with internal indirect coils for wall mountingnext to a wall mounted gas boiler. Cylinder and internal indirectcoils made from steel, corrosion protection through Ceraprotectenamel coating and protective magnesium anode.Vitocell 100-W, (type CUG)120 and 150 litre capacity, vertical, enamelled, internal indirectcoilsVertical DHW cylinder with internal indirect coils specially for installationbelow a wall mounted oil or gas boiler. Cylinder and internal indirectcoils made from steel, corrosion protection through Ceraprotectenamel coating and protective magnesium anode.The cylinder features all-around rigid polyurethane foam insulationenclosed within an epoxy resin-coated sheet steel casing with a whitefinish.A special connection set for wall mounted gas boilers is available separately.The DHW cylinders feature all-around rigid polyurethane foam insulationenclosed within an epoxy resin-coated sheet steel casing with awhite finish.Special connection sets for wall mounted boilers and casing for theconnection lines are available separately.Vitocell 100-L (type CVL) and Vitotrans 222500, 750 and 1000 litre capacity, primary store system, enamelledVertical DHW cylinder for connecting an external heat exchangerset.Steel primary store, Ceraprotect enamel coating and protective magnesiumanode for anti-corrosion protection.The primary stores feature all-around plastic-coated flexible polyurethanefoam insulation in Vitosilver. The removable thermal insulationis supplied separately.Vitotrans 222Primary store set comprising plate heat exchanger with thermal insulation,cylinder primary pump and heating water pump and line regulatingvalve.Vitocell 100-B (type CVB) / Vitocell 100-U (type CVU)300 litre capacity, vertical, enamelled, for solar DHW heatingVertical DHW cylinder with two internal indirect coils for dual-modeDHW heating.Cylinder and internal indirect coils made from steel, corrosion protectionthrough Ceraprotect enamel coating and protective magnesiumanode.The DHW cylinders feature all-around rigid polyurethane foam insulationenclosed within an epoxy resin-coated sheet steel casing with aVitosilver or white finish (Vitocell 100-W, type CVB).Vitocell 100-U (type CVU) also with fitted Solar-Divicon and Vitosolic100 solar control unit. Colour Vitosilver or white (Vitocell 100-W, typeCVU).400 and 500 litre capacity, vertical, enamelled, for solar DHWheatingVertical DHW cylinder with two internal indirect coils for dual-modeDHW heating.Cylinder and internal indirect coils made from steel, corrosion protectionthrough Ceraprotect enamel coating and protective magnesiumanode.The DHW cylinders feature all-around plastic-coated flexible polyurethanefoam insulation in Vitosilver.The Vitocell 100-B, type CVB, 400 l, is also available in white asVitocell 100-W, type CVB.The removable thermal insulation is supplied separately.Vitocell 300-B (type EVB)300 litre capacity, vertical, made from stainless steel, for solarDHW heatingVertical DHW cylinder made of high-alloy stainless steel, with twointernal indirect coils for dual-mode DHW heating.The DHW cylinders feature all-around insulation enclosed within anepoxy resin coated sheet steel casing in a Vitosilver finish.500 litre capacity, vertical, made of stainless steel, for solar DHWheatingVertical DHW cylinder made of high-alloy stainless steel, with twointernal indirect coils for dual-mode DHW heating.The DHW cylinders feature all-around plastic-coated flexible polyurethanefoam insulation in Vitosilver. The removable thermal insulationis supplied separately.Vitocell 340-M/360-M (type SVKA/SVSA)750 and 950 litre capacity, combi cylinderVertical combi cylinder for hygienic DHW heating in continuous operation.DHW heat exchanger with internal indirect coils made from a high-alloycorrugated stainless steel pipe with a indirect solar coil for solar DHWheating and central heating backup.The Vitocell 360-M is also equipped with a stratification system toensure that the solar heat is stratified in relation to the temperature.This makes DHW heated by solar energy available very quickly.The combination cylinders feature all-around plastic-coated polyesterfleece insulation in Vitosilver.5414 646 GB6 VIESMANN VITOCELL


Product information (cont.)2.2 Overview of product featuresNominalMaterial Version Heat exchanger Colourcapacity in lCylinder Type from to StainlessEnamelledSteel horizontacalverti-wall 1 HE 2 HE sep. Vitosilverwhitesteel(buf-fer)moun-tedDHWHEVitocell 100-H CHA 130 200 X X XVitocell 300-H EHA 160 500 X X X XVitocell 100-V CVA 160 1000 X X X X XVitocell 100-V CVW 390 390 X X X XVitocell 300-V EVA 130 300 X X X X XVitocell 300-V EVI 200 500 X X X XVitocell 100-W CWG 80 80 X X X XVitocell 100-W CUG 120 150 X X X XVitocell 100-L CVL 500 1000 X X XVitocell 100-B CVB 300 500 X X X X XVitocell 100-B CVU 300 300 X X X X XVitocell 300-B EVB 300 500 X X X XVitocell 340-M SVKA 750 950 X X X X X XVitocell 360-M SVSA 750 950 X X X X X X3All cylinders are supplied with thermal insulation. Horizontal and vertical cylinders with a nominal capacity of ≤ 300 l are encased in foam. Verticalcylinders with a nominal capacity of > 300 l are supplied with separate thermal insulation.Selecting the cylinder typeThe detailed specification and performance parameters, including thecontinuous output diagrams for the DHW cylinder can be found in thedatasheets. The following tables help with initial selection.3.1 Selection according to N L factorThe calculated demand factor N (see from page 11) is used to selectthe performance factor N L of the DHW cylinder (N L ≥ N) and to searchin the first column of the following selection diagrams. DHW cylindersthat have a corresponding performance factor are marked grey.Example:DHW heating in a two-family home in conjunction with a solar thermalsystemDemand factor N = 2.3 1Selection: Vitocell 100-B, 400 l 2 (from Vitocell 100 selection diagram)or Vitocell 300-B, 300 l 2 (from Vitocell 300 selection diagram).In the top line, the flow temperature required for this output 70 °C 3can now be recorded for Vitocell 100-B, 400 l with a performance factorN L = 2.5 or 80 °C 3 for Vitocell 300-B, 300 l, with a performance factorN L = 3.5.The selection of the DHW cylinder should be checked using the specificationin the datasheet.5414 646 GBVITOCELL VIESMANN 7


Selecting the cylinder type (cont.)Vitocell 100 selection diagram31N L1.01.21.41.61.82.02.22.42.62.83.03.23.43.63.84.04.24.44.64.85.05.25.45.65.86.06.26.46.66.88.08.28.48.68.89.09.29.49.69.810.011.012.013.014.015.016.017.018.019.020.021.022.023.024.025.026.027.028.029.030.031.032.033.034.035.036.037.038.039.040.041.042.043.044.045.070 °C 80 °C 90 °C130 l130 l130 l160 l200 lVitocell 100-H130-200 l160 l200 l160 l 160 l200 lVitocell 100-V160-1000 l70°C 80 °C 90 °C200 l300 l390 l500 l750 l1000 l160 l200 l300 l390 l500 l750 l1000 l160 l200 l300 l390 l500 l750 l1000 lVitocell 100-B300-500 l A70 °C 80 °C 90 °C3300 l300 l 300 l2400 l400 l 400 l500 l500 l 500 lVitocell 100-U300 l70 °C 80 °C 90 °C300 l300 l 300 l1 - 3 Selection exampleA Upper indirect coil5414 646 GB8 VIESMANN VITOCELL


Selecting the cylinder type (cont.)Vitocell 300 selection diagram1.01.21.41.61.82.02.22.42.62.83.03.23.43.63.84.04.24.44.64.85.05.25.45.65.86.06.26.46.66.87.07.27.47.67.88.08.28.48.68.89.09.29.49.69.810.011.012.013.014.015.016.017.018.019.020.021.022.023.024.025.01N LVitocell 300-H160-500 l70 °C 80 °C 90 °C160 l200 l350 l500 l160 l200 l350 l 350 l500 l160 l200 l500 l70 °C 80 °C 90 °C130 l EVA160 l EVA200 l EVI200 l EVA300 l EVI500 l EVIVitocell 300-V130-500 l130 l EVA160 l EVA200 l EVA200 l EVI300 l EVI500 l EVI130 l EVA160 l EVA200 l EVA/EVI300 l EVI500 l EVI70 °C 80 °C 90 °C300 l500 lVitocell 300-B300 and 500 l32300 l500 l300 l500 l31 - 3 Selection example5414 646 GB3.2 Selection according to continuous outputIn accordance with the required heating from 10 to 45 °C or from 10 to60 °C and the planned flow temperature, the relevant column in thefollowing selection table is selected. The required continuous output(see from page 18) is found in the column and the cylinder type inthe first column is read off.Example:DHW heating from 10 to 60 °C, flow temperature 70 °C 1Required continuous output: 20 kW 2, enamelled cylinder, adjacentin the first column 3: Vitocell 100-V 200 l or Vitocell 100-V 300 lThe right DHW cylinder is now selected based on the specification andthe continuous output diagrams in the Vitocell datasheets.NoteThe stated continuous output is only achieved when the rated heatsource output is greater than the continuous output.When designing the system for continuous output as stated or calculated,allow for the corresponding circulation pump.VITOCELL VIESMANN 9


Selecting the cylinder type (cont.)Table for selection according to continuous outputContinuous output for DHW Continuous output for DHW heatingheatingfrom 10 to 60 °C from 10 to 45 °CFlow temperature 90 °C 80 °C 70 °C190 °C 80 °C 70 °C 60 °C 50 °CVitocell 100-H, 130 l, type CHA 27 kW 20 kW 14 kW 28 kW 23 kW 19 kW 14 kW —Vitocell 100-H, 160 l, type CHA 32 kW 24 kW 17 kW 33 kW 28 kW 22 kW 16 kW —Vitocell 100-H, 200 l, type CHA 38 kW 29 kW 19 kW 42 kW 32 kW 26 kW 18 kW —Horizontal DHWcylinderVitocell 300-H, 160 l, type EHA 28 kW 23 kW 15 kW 32 kW 28 kW 20 kW 14 kW —Vitocell 300-H, 200 l, type EHA 33 kW 25 kW 17 kW 41 kW 30 kW 23 kW 16 kW —3DHW cylindersfor wall mountedboilersVertical DHWcylinders3Vitocell 300-H, 350 l, type EHA 70 kW 51 kW 34 kW 80 kW 64 kW 47 kW 33 kW —Vitocell 300-H, 500 l, type EHA 82 kW 62 kW 39 kW 97 kW 76 kW 55 kW 38 kW —Vitocell 100-W, 80 l, type CWG — — — — 24 kW — — —Vitocell 100-W, 120 l, type CUG — — — — 24 kW — — —Vitocell 100-W, 150 l, type CUG — — — — 24 kW — — —Vitocell 100-V, 160 l, type CVA 36 kW 28 kW 19 kW 40 kW 32 kW 25 kW 9 kW —Vitocell 100-V, 200 l, type CVA 36 kW 28 kW 19 kW 40 kW 32 kW 17 kW 9 kW —2Vitocell 100-V, 300 l, type CVA 45 kW 34 kW 23 kW 53 kW 44 kW 23 kW 18 kW —Vitocell 100-V, 500 l, type CVA 53 kW 44 kW 33 kW 70 kW 58 kW 32 kW 24 kW —Vitocell 100-V, 750 l, type CVA 102 kW 77 kW 53 kW 123 kW 99 kW 53 kW 28 kW —Vitocell 100-V, 1000 l, type CVA 121 kW 91 kW 61 kW 136 kW 111 kW 59 kW 33 kW —Vitocell 100-V, 390 l, type CVW 98 kW 78 kW 54 kW 109 kW 87 kW 77 kW 48 kW 26 kWVitocell 300-V 130 l, type EVA 32 kW 25 kW 16 kW 37 kW 30 kW 22 kW 13 kW 9 kWVitocell 300-V 160 l, type EVA 36 kW 28 kW 19 kW 40 kW 32 kW 24 kW 15 kW 10 kWVitocell 300-V 200 l, type EVA 57 kW 43 kW 25 kW 62 kW 49 kW 38 kW 25 kW 12 kWVitocell 300-V, 200 l, type EVI 63 kW 48 kW 29 kW 71 kW 56 kW 44 kW 24 kW 13 kWVitocell 300-V, 300 l, type EVI 82 kW 59 kW 41 kW 93 kW 72 kW 52 kW 30 kW 15 kWVitocell 300-V, 500 l, type EVI 81 kW 62 kW 43 kW 96 kW 73 kW 56 kW 37 kW 18 kWVitocell 100-U, 300 l, type CVU 23 kW 20 kW 15 kW 31 kW 26 kW 20 kW 15 kW 11 kWDual-mode DHWcylinders AVitocell 100-B, 300 l, type CVB 23 kW 20 kW 15 kW 31 kW 26 kW 20 kW 15 kW 11 kWVitocell 100-B, 400 l, type CVB 36 kW 27 kW 18 kW 42 kW 33 kW 25 kW 17 kW 10 kWVitocell 100-B, 500 l, type CVB 36 kW 30 kW 22 kW 47 kW 40 kW 30 kW 22 kW 16 kWVitocell 300-B, 300 l, type EVB 74 kW 54 kW 35 kW 80 kW 64 kW 45 kW 28 kW 15 kWVitocell 300-B, 500 l, type EVB 74 kW 54 kW 35 kW 80 kW 64 kW 45 kW 28 kW 15 kW1 - 3 Selection exampleA upper indirect coil5414 646 GB10 VIESMANN VITOCELL


Sizing4.1 Sizing according to peak draw-off rate and DIN 4708-2For residential buildings, DHW demand is calculated based on thedemand factor N. The calculations are set out in DIN 4708-2 anddescribed below. Based on the demand factor N, a cylinder with a correspondingperformance factor N L is then selected (N L ≥ N).The performance factor N L of a DHW cylinder can also be expressedas the peak output over 10 minutes. Systems for DHW heating aresized according to this "peak draw-off rate" if a specific volume of DHWhas to be provided for a short period of time, after which a longer periodof time is available to reheat the cylinder again. This may, for example,occur in commercial operations or schools (intermittent operation).The 10 minute peak output is determined almost exclusively by thevolume of water stored (cylinder capacity).Calculation program EDIS/DIN 4708-2DHW cylinders can also be sized with the aid of the EDIS calculationprogram. The program sizes DHW cylinders on the basis ofDIN 4708 for residential buildings and includes various calculationprocesses for hotels, restaurants, hospitals, residential homes, campsites,leisure/sports centres, etc.You can obtain the Viessmann "EDIS" calculation program on requestthrough our sales offices.The performance factor N L and the maximum continuous output of theDHW cylinder is given in the tables from page 8. The detailed specificationand performance parameters, including continuous output diagramscan be found in the datasheet for the relevant DHW cylinder.Calculating the heat demand for DHW heating in residential buildingsThis calculation is based on DIN 4708 (central DHW heating systems)Part 2.The DIN 4708 is the basis for the standard calculation of the heatdemand for central DHW heating systems in residential buildings.For the purposes of calculating the heat demand, a standard apartmentis defined as follows:The standard apartment is a residential unit based on statistical values,the demand factor N of which is = 1:■ Number of rooms r = 4 rooms■ Occupancy rate p = 3.5 persons■ Draw-off demand w v = 5820 Wh/draw-off volume for a bathThe following information is required to calculate the demanda) All sanitary equipment on all floors (from building design drawingsor details supplied by architect or client)b) Number of occupied rooms (no. of rooms) excluding ancillaryrooms, such as kitchen, entrance, hall, bathroom and storage area(from building design drawings or details supplied by architect orclient)c) Number of occupants per residential unit (occupancy rate).If the number of occupants for each dwelling cannot be ascertained,a statistical occupancy rate p can be calculated on the basisof the number of rooms r for the residential unit concerned usingtable 1.Table 1Number of rooms rOccupancy rate p1.0 2.0 *11.5 2.0 *12.0 2.0 *12.5 2.33.0 2.73.5 3.14.0 3.54.5 3.95.0 4.35.5 4.66.0 5.06.5 5.47.0 5.6Establishing the number of draw-off points to be taken intoaccount when calculating the demandThe number of taps must be taken into account when calculating theoverall demand. This varies according to the specifications of theapartment (basic or deluxe) and can be derived from tables 2 or 3.4Calculating the occupancy rate pThe following table can be used for calculating the occupancy rate p,if the number of persons per residential unit is unknown.Table 2 – Accommodation with standard equipment levelExisting amenities per apartmentTo be taken into account for calculating the demandRoom EquipmentBathroom 1 bath 140 litre (according to table 4 no. 1 on page 12) 1 bath 140 litre (according to table 4 no. 1 on page 12)or1 shower cubicle with/without mixer tap and standard showerhead1 washbasin Not taken into accountKitchen 1 kitchen sink Not taken into account5414 646 GB*1 If the residential building concerned mainly comprises apartments with 1 and/or 2 main rooms, increase the occupancy rate p by a factor of0.5.VITOCELL VIESMANN 11


Sizing (cont.)Table 3 – Accommodation with deluxe equipment levelExisting amenities per apartmentTo be taken into account for calculating the demandRoom EquipmentBathroom Bath *2 As per table 4, no. 2 to 4Shower cubicle *2As existing, incl. any additional facilities according to table 4, no.6 or 7, if arranged to permit simultaneous use *3Basin *2Not taken into accountBidetNot taken into accountKitchen 1 kitchen sink Not taken into accountGuestroomBathPer guest room: as per table 4, no. 1 to 4, with 50 % of the drawoffdemand w vorShower cubicleAs existing, incl. possible additional equipment as per table 4,no. 5 to 7, with 100 % of the draw-off demand w vWashbasin At 100% of the draw-off demand w v according to table 4 *4Bidet At 100 % of the draw-off demand w v according to table 4 *4Calculating the applicable draw-off demand per draw-off point to be consideredThe respective draw-off rate w v for the draw-off points included in thecalculation of the demand factor N can be taken from table 4.4Table 4 – Draw-off demand w vno. Sanitary equipment or draw-off point DIN code Draw-off volume per use oravailable capacity in litres1 Bath NB1 140 58202 Bath NB2 160 65103 Small and stepped bath KB 120 48904 Large bath (1800 mm × 750 mm) GB 200 87205 Shower cubicle *5 with mixer tap and economy shower BRS 40 *6 1630head6 Shower cubicle *5 with mixer tap and standard shower BRN 90 *6 3660head *77 Shower cubicle *5 with mixer tap and deluxe shower BRL 180 *6 7320head *88 Washbasin WT 17 7009 Bidet BD 20 81010 Washbasin HT 9 35011 Kitchen sink SP 30 1160Draw-off demand w v peruse in WhFor baths whose available capacities vary considerably, apply thedraw-off demand w v in accordance with formula w v = c × V × ΔT in Whand use it in the calculation (ΔT = 35 K).Calculating the demand factor NIn order to establish the heat demand for the DHW for all residentialunits to be supplied, it is first necessary to convert the data into theheat demand for DHW of the standard residential unit.The following characteristics of the standard apartment are agreed:1. Number of rooms r = 4 rooms2. Occupancy rate p = 3.5 persons3. Draw-off demand w v = 5820 Wh (for one bath)The heat demand for DHW of the standard residential unit 3.5 occupants× 5820 Wh = 20370 Wh corresponds to the demand factor N =1N = total of the heat demand for DHW of all residential units to besupplied with DHW, divided by the heat demand for DHW for thestandard residential unit*2 Size different from standard equipment level.Σ(n · p · v · w v )N =3.5 · 5820=Σ(n · p · v · w v )20370n = Number of similar apartmentsp = Occupancy rate per similar apartmentv = Number of similar draw-off points per similar apartmentw v = Draw-off demand in Wh(n · p · v · w v ) must be calculated for each relevant draw-off point persimilar apartment.*3 If no bath is installed, a bath is assumed instead of a shower cubicle as with the standard specification (see table 4, no. 1) unless the drawoffdemand of the shower cubicle exceeds that of the bath (e.g. deluxe shower).If several different shower cubicles are installed, at least one bath is assumed for the shower cubicle with the highest draw-off rate.*4 If no bath or shower cubicle is assigned to the guest room.*5 To be included in calculations only if the bath and shower cubicle are in separate rooms, i.e. if simultaneous use is possible.*6 Corresponding to a 6 minute use.*7 Fitting flow rate class A to EN 200.*8 Fitting flow rate class C to EN 200.12 VIESMANN VITOCELL5414 646 GB


Sizing (cont.)With the aid of the calculated demand factor N, the tables onpages 8 and 9 enable the selection of the required DHW cylinder atthe appropriate heating water flow temperature. For this, select a DHWcylinder whose N L factor is at least equal to N.The demand factor N is identical to the number of standard apartmentsin the building project.It does not necessarily correspond to the number of apartments.The numbers of similar apartments, the number of rooms and theequipment level listed in table 5 have been taken from the buildingplans.The occupancy rate p was determined using the room factor r and table1 on page 11.The applied number of draw-off points was calculated using table 2 onpage 11 and table 3 on page 12.Example:For a residential building project, design the DHW system on the basisof demand factor N.Table 5No. of apartmentsnNo. of roomsrOccupancy ratepAmenities of the apartmentNumber, description4 1.5 2.0 1 shower cubicle with standard showerhead1 washbasin in the bathroom1 sink in the kitchen10 3 2.7 1 bath 140 litre1 washbasin in the bathroom1 sink in the kitchen2 4 3.5 1 shower cubicle with mixer tap anddeluxe shower head1 shower cubicle with standard showerhead (in a physically separate location)1 washbasin in the bathroom1 sink in the kitchen4 4 3.5 1 bath 160 litre1 shower cubicle with deluxe showerhead in a separate room1 washbasin in the bathroom1 bidet1 sink in the kitchen5 5 4.3 1 bath 160 litre1 washbasin in the bathroom1 bidet1 bath 140 litre, in the guest room1 washbasin in the guest room1 sink in the kitchenApply for the demand calculationNo. of draw-off points, descriptionaccording to table 2 on page 111 shower cubicle (BRN)according to table 2 on page 111 bath (NB1)according to table 3 on page 121 shower cubicle (BRL)according to table 3 on page 121 bath (NB2)1 shower cubicle (BRL)according to table 3 on page 121 bath (NB2)1 bath (NB1) with 50 % of the draw-offdemand w v1 washbasin (WT)1 bidet (BD)45414 646 GBForm for calculating the heat demand for DHW heating in residential buildingsCalculating the demand of apartments with centralised supply systemsProject no:Sheet no:Calculating the demand factor N for determining the required DHW cylinder sizeProjectOccupancy factor p based on statistical values as per table 5, page 131 2 3 4 5 6 7 8 9 10 11Sequentialnumber ofNo. ofroomsNo. ofapartmentsOccupancyrateNo. of draw-off points to consider (perapartment)CommentsapartmentgroupsInitialsv · w vin Whn · p · v · w vin Whr n p n · p Number ofdraw-offpointsvDraw-offdemandw vin Wh1 1.5 4 2.0 8.0 1 NB1 5820 5820 46560 NB1 forBRN2 3.0 10 2.7 27.0 1 NB1 5820 5820 1571403 4.0 2 3.5 7.0 1 BRL 7320 7320 512401 BRN 3660 3660 256204 4.0 4 3.5 4.0 1 NB2 6510 6510 911401 BRL 7320 7320 1024805 5.0 5 4.3 21.5 1 NB2 6510 6510 139965(0.5) NB1 5820 5820 62565 50% w v acc.to Tab. 3 onpage 12VITOCELL VIESMANN 13


Sizing (cont.)Calculating the demand of apartments with centralised supply systemsProject no:Sheet no:Σ n i = 25Σ (n · p · v · w v ) = 676710 WhΣ(n · p · v · w v ) 676710N == = 33.23.5 · 5820 20370With the aid of the calculated demand factor N = 33.2, the tables in therelevant datasheets enable the selection of the required DHW cylinderat the available heating water flow temperature (e.g. 80 ºC) and a cylinderstorage temperature of 60 ºC:For this, select a DHW cylinder the N L factor of which is at least equalto the calculated demand factor N.NoteThe performance factor N L varies subject to the following magnitudes:■ Flow temperature■ Storage temperature■ Available or transferable outputFor deviating operating conditions, modify the performance factor N Lfrom the values shown in the tables in the relevant datasheets.Possible DHW cylinders:■ From selection diagram from page 9 and the Vitocell 300-H datasheet:Vitocell 300-H with 700 litre capacity (N L = 35) as cylinder bankcomprising 2 × Vitocell 300-H, each with 350 litre capacity■ From selection diagram from page 9 and the Vitocell 300-V datasheet:Vitocell 300-V with 600 litre capacity (N L = 38) as cylinder bank comprising2 × Vitocell 300-V, each with 300 litre capacitySelected DHW cylinders:2 × Vitocell 300-V, each with 300 litre capacity.4Boiler supplement Z KAccording to DIN 4708-2 or VDI 3815, the rated output of a boiler mustbe increased by the boiler supplement Z K to cover the DHW heatingdemand (see table 6).Observe the explanations in DIN/VDI [or local regulations].The DIN 4708 specifies three main demands for the rated outputof the heat source:Demand 1The performance factor must be at least equal to or greater than thedemand factor:N L ≥ NDemand 2Only if the rated boiler output ² K or Φ K is higher or at least equal to theconstant output, can the DHW cylinder deliver the performance factorN L stated by the manufacturer:² K ≥ ² D or Φ K ≥ Φ DDemand 3Heat generating systems which are used for both DHW and centralheating must cover the additional output Z K as well as the standardheating load Φ HL bui. EN 12831 (previously DIN 4701):Φ K ≥ Φ HL bui. + Z KOn the basis of DIN 4708-2, the VDI 3815 is used for calculating asupplement to the rated boiler output as a function of the demand factorN and a minimum cylinder capacity (see table 6).It has proved successful in practice to take the boiler supplement intoaccount according to the following relations:Φ K ≥ Φ HL bui. · ϕ + Z Kϕ = Factor for the capacity utilisation of the building heating system (allrooms heated)Number of apartments per buildingϕup to 20 121 to 50 0.9> 50 0.8Table 6 – Boiler supplement Z KDemand factor NBoiler supplement Z Kin kW1 3.12 4.73 6.24 7.75 8.96 10.27 11.48 12.69 13.810 15.112 17.314 19.516 21.718 23.920 26.122 28.224 30.426 32.428 34.630 36.640 46.750 56.760 66.680 85.9100 104.9120 124.0150 152.0200 198.4240 235.2300 290.0NoteIn buildings with an extremely low heat input Φ HL bui. , a check must becarried out to determine whether the output of the heat source, includingsupplement Z K is sufficient for the selected performance factor. Itmay be necessary to select a larger DHW cylinder.5414 646 GB14 VIESMANN VITOCELL


Sizing (cont.)Calculating the heat demand for DHW heating in commercial operations1. Calculating requirementsAllow for a suitable number of washroom facilities (washing/showerunits) for the type of business concerned (see the earlier DIN 18228,sheet 3, page 4).Per 100 users (numbers in the most numerous shift), the washroomfacilities listed in table 7 are required.Table 7 – Standard working conditions *9Activity Number of washroomfacilities per100 usersSplitting the washroomfacilitiesWash facilities/showercubiclesSlightly dirty 15 –/–Moderately dirty 20 2/1Very dirty 25 1/12. Sizing the DHW heating systemThe following example is used to illustrate how to size the DHW heatingsystem.Example:Number of employees during the most numerous 150 employeesshift:Working pattern:2 shift operationType of activity:Moderately dirtyRequired DHW outlet temperature: 35 to 37 ºCCylinder storage temperature: 60 ºCCold water inlet temperature: 10 ºCHeating water flow temperature: 90 ºCCalculating the DHW demandTable 7 shows that for moderately dirty work, 20 washroom facilitiesare required per 100 employees. The ratio of wash-basins to showerunits is 2:1.Therefore, 20 wash-basins and 10 shower units are required for 150employees.Table 8 – Consumption figures for washing facilities and showercubicles with a DHW outlet temperature of 35 to 37 ºCConsumption point DHW volumein l/minUtilisationtime in minDHW consumptionper use inlWash-basins with tap 5 to 12 3 to 5 30Wash-basins with 3 to 6 3 to 5 15spray headCircular communal approx. 20 3 to 5 75washbasin for 6 personsCircular communal approx. 25 3 to 5 75washbasin for 10 personsShower unit without 7 to 12 5 to 6 *10 50changing cubicleShower unit withchanging cubicle7 to 12 10 to 15 *11 80Assuming:The washing facilities (washbasin with spray head) are used by 120employees (6 times in sequence) and the shower cubicles (showerswithout changing cubicles) are used by 30 employees (3 times insequence).Using table 8, we arrive at the following DHW volume required:a) DHW demand of the washroom facilities: 120 × 3.5 litre/min ×3.5 min = 1470 litreb) DHW demand of the showers: 30 × 10 litre/min × 5 min =1500 litreTogether, a) and b) result in a total DHW demand of 2970 litre atapprox. 36 ºC water temperature for a utilisation period of approx. 25minutes.Converted to an outlet temperature of 45 ºC we arrive at:ΔT (36 °C – 10 °C)V (45°C) = V (36°C) · ΔT(45 °C – 10 °C)26= 2970 · =2206 l 35As 8 hours are available between the shifts for reheating the DHWcylinder, the cylinder capacity should be sized for storage purposes.For this, the details for the peak output (10 minute output) in the tablesin the relevant datasheets for the DHW cylinders are used.The relevant table in the Vitocell 300-V datasheet, line "Heating waterflow temperature = 90 ºC" for the Vitocell 300-V with 500 litre capacityshows the peak output at 10/45 ºC as 627 litres/10 minutes.Number of DHW cylinders n = calculated total volume/selected peakoutput (10 minute output) of the individual cylinders2206n = 627= 3.5 pce.Selected DHW cylinders:4 × Vitocell 300-V, each with 500 litre capacity.Calculating the required heating output7.5 hours are available for heating up the DHW cylinder; this gives aminimum connected output (i.e. boiler output) of:² A = Φ A =c · V · ΔT AZ A1 · 2000 · 50= = 15.5 kW860 · 7.5² A or Φ A = minimum connected output for heating the DHW cylinderin kWV = selected cylinder capacity in litrec =1 kWhspec. thermal capacity 860 l · KΔT A = Temperature differential between the cylinder storagetemperature and the cold water inlet temperature(60 ºC – 10 ºC) = 50 KZ A = heat-up time in hAs an empirical value, a heat-up time of approx. 2 hours is selected.In the above example, this would mean that the boiler and the circulationpump for cylinder heating (required heating water volume)should be sized for a heat-up rating of approx. 60 kW.45414 646 GB*9 In plants with exceptionally dirty working conditions, 25 washroom facilities are required per 100 users.*10 Showering time excluding changing.*11 Showering time 5 to 8 minutes; rest of time for changing.VITOCELL VIESMANN 15


Sizing (cont.)Calculating the heat demand for DHW heating in hotels, guest houses and residential homesTo calculate the DHW demand, it is necessary to establish details ofthe points of consumption of every room.For this, only consider the largest point of consumption per single/double room.Table 9 – Draw-off demand per consumer at a DHW temperatureof 45 ºCConsumptionpointVolume of hotwater drawn offper use in lDraw-off demand Q h max.per singleroom in kWhper doubleroom in kWhBath 170 7.0 10.5Shower cubicle 70 3.0 4.5Washbasin 20 0.8 1.2■ Heating water flow temperature = 80 °C■ Required heat-up time of the DHW cylinder 1.5 hours■ Duration of peak demand 1.5 hoursHeat demand for DHW heatingType of roomEquipment level(draw-off point)nQ h max.n × Q h max.in kWhin kWhSingle room: Bath 5 7.0 35.00Shower cubicle 10 3.0 30.00Washbasin 5 0.8 4.00Double rooms: Bath 5 10.5 52.50Shower cubicle 20 4.5 90.00Washbasin 5 1.2 6.00Σ (n · Q h max. ) = 217.504Calculating the required cylinder capacityQ h max. = Draw-off demand per draw-off point in kWhn = Number of rooms with identical draw-off demandϕ n = Utilisation factor (simultaneity); can be applied conditionally:Number of rooms 1 to 15 16 to 36 35 to 75 76 to 300ϕ *12 n1 0.9 to 0.7 0.7 to 0.6 0.6 to 0.5ϕ 2 = Hotel grading factorThe following factors can be applied to reflect the category ofhotel:Hotel category standard good highϕ 2 1.0 1.1 1.2Z A = heat-up time in hThe heat-up time is subject to the output available for DHWheating. Subject to the rated boiler output, you can select asmaller Z A value than 2 hours.Z B = Duration of the peak DHW demand in h.Assumption: 1 to 1.5 hV = Volume of the DHW cylinder in litreT a = Cylinder storage temperature in ºCT e = Cold water inlet temperature in °Ca = 0.8; this takes into account the state to which the cylinder isheated upExample:Hotel with 50 rooms (30 double rooms and 20 single rooms)■ Amenities of the single rooms:5 single rooms with bath, shower and washbasin10 singles with shower cubicle and basin5 single rooms with washbasin■ Amenities of double rooms:5 double rooms with bath and washbasin20 double rooms with shower cubicle and washbasin5 double rooms with washbasin860 · Σ(n · Q h max. ) · φ n · φ 2 · Z AV =(Z A + Z B ) · (T a – T e ) · a860 · 217.5 · 0.65 · 1 · 1.5= (1.5 + 1.5) · (60 – 10) · 0.8=1520 lSelected DHW cylinders:3 x Vitocell 300-H, each with 500 litre capacityor3 × Vitocell 300-V, each with 500 litre capacityCalculating the required heat-up outputV · c · (T² a – T e )= Φ =Z A1500 · (60 – 10)= = 58 kW860 · 1.5² or Φ = heat-up output in kWV = selected capacity in litrec1 kWh= spec. thermal capacity 860 l · KT a = cylinder storage temperature in ºCT e = cold water inlet temperature in °CZ A = Heat-up time in hThe boiler and circulation pump for cylinder heating must be sizedaccordingly for the required heat up output.To guarantee adequate heating of the building during winter too, thisheat volume must be added to the heating load.Calculating the heat demand for DHW heating in commercially utilised sauna operationAssuming:The sauna is used by 15 users/h.5 showers with 12 litre/min are available, i.e. the showers are utilised3 times in a row. A showering time of 5 minutes results in a DHWdemand of 60 litre per use.The heating load of the building is ² N = Φ HL bui. = 25 kW.Two points must be observed to safeguard adequate DHW heating:a) Adequate storage capacity (sized according to peak output).b) The boiler must be large enough to cover the DHW heating and² N .*12 For spa hotels, trade fair hotels or similar installations, select a utilisation factor of ϕ n = 1.to a)Calculating cylinder volume:15 persons @ 60 litre = 900 litre at 40 ºC at the DHW outlet.The cylinder storage temperature is 60 ºC.As a low temperature boiler is to be installed, the peak output at aheating water flow temperature of 70 ºC must be calculated; see tablesin the datasheets for the relevant DHW cylinders:Conversion to an outlet temperature of 45 ºC results in:16 VIESMANN VITOCELL5414 646 GB


Sizing (cont.)ΔT (40 °C – 10 °C)V (45°C) = V (40°C) · ΔT(45 °C – 10 °C)30= 900 · 35=771 lSuggestion: 2 x Vitocell 300-V, each with 300 litre capacity with a peakrate of 375 litre per cylinder and 698 litre as cylinder bank (DHW temperature45 ºC).to b)Required boiler sizeAs the showering process repeats hourly, the selected cylindercapacity must be heated up within 1 hour. The output required to achievethis is calculated as follows:² A or Φ A = minimum connected output for heating the DHW cylinderin kWV cyl. = capacity in litreΔT A = Temperature differential between the cylinder storagetemperature and the cold water inlet temperaturec =1 kWhspec. thermal capacity 860 l · KZ A = heat-up time in hTo guarantee adequate heating of the building during winter too, thisheat volume must be added to the heating load. EnEV [Germany] permitsthis supplement for the following reasons:1. This is commercial utilisation.2. There is no output limit when using a low temperature boiler.V²cyl. · ΔT A · cA = Φ A =Z A600 · 1 · (60 – 10)=860 · 1= 34.9 kWCalculating the heat demand for DHW heating for leisure/sports centresObserve DIN 18032-1, April 1989 "Sports centres, gymnasia andindoor leisure centres" as guideline for the sizing, design and installationof the DHW system.DHW is drawn-off in sports centres in short bursts.Therefore, when it comes to selecting suitable DHW cylinders, themain criterion is the "Peak draw-off rate" (10 minutes output).The DHW heating system must be capable of ensuring the DHW deliveryover the entire period of use (throughout the year).The following values are assumed for sizing the DHW heatingsystem:DHW draw-off temperature: max. 40 ºCDHW consumption per person µ: 8 l/minShower duration per person t:4 minHeat-up time Z A :50 minPersons per heat-up time and trainingunit n:min. 25 usersCylinder storage temperature T a : 60 ºCExample for a simple gymnasium:1. Calculating the required volume of hot water:m MW = t · µ · n= 4 min / person · 8 litre / min · 25 persons= 800 litre DHW volume at 40 ºCSelected capacity: 700 litres(the selected capacity should roughly correspond to the required DHWvolume).Peak output from the corresponding tables in the datasheets for therelevant DHW cylinders.Conversion to DHW outlet temperature of 40 ºC atm (40 ºC) = peak output at a DHW outlet temperature of 40 ºCm (45 ºC) = peak output at a DHW outlet temperature of 45 ºC(according to table in DHW cylinder datasheet)Selected DHW cylinders:2 x Vitocell 300-H, with 350 litre capacity,Peak output at 70 ºC heating water flow temperature = 989 litre at40 ºC2. Calculating the required heat-up output for the calculated cylindercapacity:V · c · (T² a – T e )A = Φ A =Z A700 · (60 – 10)= = 49 kW860 · 0,833² A or Φ A = heat-up output in kWV = cylinder capacity in litrec1 kWh860 l · K= spec. thermal capacityT a = cylinder storage temperature in ºCT e = cold water inlet temperature in °CSize the boiler and circulation pump for cylinder heating according tothe required heat-up output.To guarantee adequate heating of the building during winter too, thisheat volume must be added to the heating load. EnEV [Germany] permitsthis supplement for the following reasons:1. This is commercial utilisation.2. There is no output limit when using a low temperature boiler.4m (40°C) = m (45°C) ·45 – 1040 – 10= 2 · 424 l/10 min35= 848 · 305414 646 GB= 989 l/10 minVITOCELL VIESMANN 17


Sizing (cont.)Calculating the heat demand for DHW heating in connection with district heating systemsDHW heating systems that are to be heated by district heating systemsinstead of boilers, cannot be sized according to the values containedin the DHW cylinder tables because of different heating water flow andreturn temperatures in winter and summer.The following example illustrates one method that can be used for sizingpurposes.Example:Total heating load of the building² NW or Φ HL bui. W : 20 kWDHW demand factor N: 1.3Heating water flow/return temperature– in winter: 110/50 ºC– in summer: 65/40 ºCSelected cylinder:1 Vitocell 300-V (typeEVI), 200 litre capacity withN L = 1.4² NWµ W = c · ΔTWΦ HL buil. W= c · ΔTW860 · 20=110 – 50= 287 l/h2. Calculating the connected output in summer with a constantdistrict heating water volume (µ S = µ W )µ S = district heating water volume in summer in litre/h² NS or Φ HL bui. S = connected output in summer in kWΔT S =temperature differential in summer between thedistrict heating water flow and return temperaturein K41. Calculating the required district heating water volumeµ W = district heating water volume in winter in litre/h² NW or Φ HL bui. W = connected output in winter in kWc =1 kWhspec. thermal capacity 860 l · KΔT W =temperature differential in winter between districtheating water flow and return temperature in KTable 10 – Performance data with restriction of the return temperatureVitocell 100-V on request.² NS = Φ HL buil. S = µ S · c · ΔT Swith (µ S = µ W )1= 287 · · (65 – 40)860= 8.33 kWVitocell 300-V (type EVI)Cylinder capacity l 200 300 500Continuous output at kW 15 16 19heating water flow and return temperature 65/40 ºC and l/h 375 393 467DHW heating from 10 to 45 ºCPerformance factor N *13 Lat a heating water flow and return temperature 65/40 ºC andDHW storage temperature T cyl = 50 ºC1.4 3.0 6.010 minute output l 164 230 319NoteThe performance data for DHW cylinders when there is a restriction ofthe return temperature can be found in the continuous output diagramsin the relevant datasheets.Note: When return temperatures are restricted, a check must be carriedout to determine whether the hygiene requirements in accordancewith TRWI/DVGW are met. A transfer pump may have to be provided.4.2 Sizing according to continuous outputSizing according to continuous output is employed in cases where hotwater is to be continuously drawn off from the DHW cylinder. This calculationmethod is therefore mainly used for commercial applications.Determining the required DHW cylinder, example 1 (with constant flow temperatures)Preconditions:■ Continuous output in litre/h or kW■ DHW outlet temperature in °C■ Cold water inlet temperature in °C■ Heating water flow temperature in °C*13 With limitation of the return temperature.The number and capacity of the required DHW cylinder(s) and heatingwater flow rate, plus the head of the circulation pump for cylinder heatingare calculated using the DHW cylinder "specification".The DHW cylinder is sized in the same way.The following example illustrates the calculating process.see5414 646 GB18 VIESMANN VITOCELL


Sizing (cont.)Example:For production purposes, a factory requires 4100 litre/h hot water at atemperature of 60 ºC. Boilers deliver a heating water flow temperatureof 90 ºC. The cold water inlet temperature is 10 ºC.■ Continuous output = 4100 litre/h■ DHW outlet temperature = 60 ºC■ Cold water inlet temperature = 10 ºC■ Heating water flow temperature = 90 ºC■ Required cylinder type: Stainless steel, verticalCalculating the number and size of the DHW cylindersProcedure:1. Select Vitocell 300-V, type EVI2. Refer to the specification for cylinder banks in the Vitocell 300-Vdatasheet.3. In the table, find the line for "Continuous output from 10 to 60 ºC"and Heating water flow temperature "90 ºC".4. In the column Cylinder capacity = 500 litre and Number of cylinderarrangement = 3, you will find a continuous output of 4179 litres/h.Selected DHW cylinders:3 × Vitocell 300-V (type EVI) each of 500 l capacity.The continuous output of the selected DHW cylinders must be at leastequal to the required constant output.Calculating heating water flow rateA heating output of 243 kW must be made available for the calculatedcontinuous output (see "Specification", table "Specification" in thedatasheet for the DHW cylinder). The required heating water flow rateis stated in the table column for the selected DHW cylinder - heatingwater flow rate = 19.5 m 3 /h; i.e. size the circulation pump for cylinderheating for a heating water flow rate of 19.5 m 3 /h.Calculating the pressure drop on the heating water sideThe total flow rate of 19.5 m 3 /h must be taken into account for theheating water flow and return lines (valves, bends etc.) as well as theboiler when calculating the pressure drop in the complete system.Where several cylinders are connected in parallel, the total pressuredrop is equal to the pressure drop of an individual cylinder. The pressuredrop of the DHW cylinder on the heating water side for the headof the circulation pump for cylinder heating is calculated as follows:As the 3 DHW cylinders are connected in parallel, each cylinder hasa heating water flow rate of 6.5 m 3 /h (see following illustration). Turnto the diagram "Pressure drop on the heating water side in the datasheetfor Vitocell 300-V (type EVI)". For a heating water flow rate of6500 l/h, a pressure drop of 400 mbar can be read off the straight lineof the cylinder with a capacity of 500 l.19.56.56.5136.5 13A Heating water flowB Heating water return6.56.519.5Result:Total heating water flow rate = 19.5 m 3 /hHeating water flow rate per cylinder = 6.5 m 3 /hPressure drop of the DHW cylinder on the heating water side =400 mbarSizing the circulation pump for cylinder heatingThe circulation pump for cylinder heating must therefore deliver aheating water flow rate of 19.5 m 3 /h and overcome the pressure dropon the heating water side of 400 mbar for the 3 cylinders, plus thepressure drop of the boiler, the pipework between the cylinders andthe boiler as well as the individual pressure drop values of fittings andvalves.The following rule of thumb applies: If the available boiler output ² K (toDIN 4701) or Φ K (to EN 12831) is lower than the continuous output² Cyl. or Φ Cyl. , it is sufficient to size the circulation pump for cylinderheating to suit the transfer of the boiler output. If, on the other hand,the boiler output is greater than the continuous output ² Cyl. or Φ Cyl. , thecirculation pump for cylinder heating can be sized to suit the continuousoutput as a maximum rating.4Determining the required DHW cylinder, example 2 (with a fixed heat source temperature differential)5414 646 GBPreconditions:■ Required continuous output in kW or in litre/h (conversion required)■ DHW outlet temperature in °C■ Cold water inlet temperature in °C■ Heating water flow temperature in °C■ Heating water return temperature in °CConversion of continuous output from litre/h to kW² req. or Φ req. = Continuous output in kWµ WW = Continuous output in litre/hc =1 kWhspec. thermal capacity 860 l · KΔT WW = Temperature differential between DHW outlet temperatureand cold water inlet temperature in K² req. or Φ req. = µ WW · c · ΔT WWThe size and number of DHW cylinders required can be calculatedusing the diagrams for the continuous output of the DHW cylindersconcerned.Example:Required continuous output= 3000 litre/hHeating water flow temperature = 80 ºCHeating water return temperature = 60 ºCHeating water temperature differential = 80 ºC – 60 ºC = 20 KCold water inlet temperature = 10 ºCDHW outlet temperature = 45 ºCA vertical DHW cylinder has to be used on account of the structuralcharacteristics of the building.Conversion of continuous output from litre/h to kW² req. or Φ req. = µ WW · c · ΔT WW1= 3000 · · (45 – 10)860= 122 kWVITOCELL VIESMANN 19


Sizing (cont.)5Calculating the continuous output of the various cylinder sizesAs the method of calculation is the same for all cylinder sizes, theprocess for calculating the continuous output of the Vitocell 300-V with300 l capacity is used here as a representative example for all cylindersizes (see also the datasheet for the Vitocell 300-V with 300 lcapacity).Starting from the horizontal axis at 20 K (point 1), draw a vertical lineupwards. The curve intersection for the required DHW temperaturerise (from 10 ºC to 45 ºC) at the given heating water flow temperatureof 80 ºC results in point 2.From point 2 draw a horizontal line.The point of intersection with the vertical axis results in point 3. Youcan read off the continuous output of the DHW cylinder at point 3 as54 kW.Continuous output in kW100959085807570656055504540353025201510550607080Heating water flow temperature ...°C5.0 m³/h9045280 mbar3.0 m³/h110 mbarDHW heating from 10 to ...°C6045604545601.0 m³/h4515 mbarHeating water volume ... m³/hPressure drop on the heating water side ... mbar00 5 10 15 20 25 30 35 40 45 50Heating water temperature differential (ΔT) in KCalculating the required number of DHW cylinders of a given sizen =Required number of DHW cylinders² req. or Φ req. = Required continuous output in kW² Cyl. or Φ Cyl. = Continuous output of the selected DHW cylinders inkWQ req.n = = Φ req.² cyl. Φ cyl.122 kW= = 2.2654 kWRequired number of DHW cylinders = 2Calculating the required flow rate on the heating water sideµ HW = Flow rate on the heating water side in litre/h² req. or Φ req. = Required continuous output in kW= Heating water temperature differential in KΔT HWc= spec. thermal capacity²µ req.HW = = 860 · ² req.c · ΔT HW ΔT HWΦ req.= = 860 · Φ req.c · ΔT HW ΔT HW=860 · 12220= 5246 l/h (total)= 2623 l/h (per DHWcylinder)1 kWh860 l · KOn the basis of the calculated heating water flow rate, the pressuredrop on the heating water side can now be calculated as described inthe example on page 19 and with the aid of the diagram forVitocell 300-V (type EVI).Result:Pressure drop on the heating water side of the DHW cylinder =80 mbar.Primary store systems — Vitocell 100-L with Vitotrans 2225.1 Applications and advantagesThe Viessmann cylinder primary system is a combination of a Vitocell100-L cylinder and a modular Vitotrans 222 heat exchanger set.The cylinder primary system for DHW heating is a preferred choice forthe following applications or conditions:■ Heating circuits requiring low return temperatures or those where thereturn temperatures are limited, e.g. for district heating or condensingboilers.5414 646 GB20 VIESMANN VITOCELL


Primary store systems — Vitocell 100-L with Vitotrans 222 (cont.)The heating/final temperature (10/60 ºC) is achieved in one passthrough the Vitotrans 222 heat exchanger. The wide DHW spreadleads to a low return temperature on the primary side. This bringsadvantages through high condensation rates when utilising condensingtechnology.■ Large cylinder volumes with offset heating and draw-off times, e.g.water is drawn off in bursts at schools, sports centres, hospitals,army camps, social buildings, apartment blocks, etc.■ Short-term peak loads, i.e. high draw-off rates and various reheattimes, e.g. DHW heating in swimming pools, sports facilities, industrialcompanies, and abattoirs.■ Limited space as the cylinder primary system can transfer a highoutput.■ Low heat losses through high-grade all-round thermal insulation(CFC-free).■ No critical germination zones through complete heating of the wholewater content.■ In conjunction with the Vitotrans 222 heat exchanger set (accessory)as a primary store system, particularly suitable for combination withcondensing boilers.■ Accurate cylinder heating to the right degree even with modulatingflow temperature.■ Vitotrans 222, comprising a plate-type heat exchanger, a circulationpump for cylinder heating and a heating water pump, available asaccessories.■ Electric immersion heater and booster lance for use in conjunctionwith heat pumps, available as accessories.Vitocell 100-L with Vitotrans 222■ Corrosion-resistant cylinder made from steel with Ceraprotectenamel coating. Additional cathodic protection via a magnesiumanode; impressed current anode available as an accessory.■ Easy handling through low weight and removable flexible PUR foamthermal insulation.5.2 Function description of the primary store systemOperation with modulating flow temperatureDuring the cylinder heating process (no draw-off), the cylinder primarypump R within the cylinder primary system withdraws cold waterT from the bottom of cylinder U; this is then heated in the heatexchanger set C and re-supplied to the top B of the cylinder.To avoid disturbing the thermal strata inside the cylinder, the cylinderprimary pump R will only be switched on if the temperature sensorL signals that the set temperature has been reached.The required heat exchanger transfer output is set by the line regulatingvalve O.Mixer assembly N (accessories) mixes the heating water on the primaryside in accordance with the set DHW temperature. To preventscaling of the plate-type heat exchanger, limit the set DHW temperatureto 60 °C.Pasteurisation (controlling legionnaires bacteria) is feasible in conjunctionwith Viessmann boilers with the Vitotronic boiler control unitsor with the Vitotronic 200-H heating circuit control units (accessories).The base load is covered by the constant output of the Vitotrans222.Any additional hot water demand during peak times is covered by thecylinder volume.Either at the end of drawing or whilst DHW is drawn off, the cylindervolume is reheated to its set temperature via the Vitotrans 222. In thefully heated state (no drawing), cylinder primary pump R and heatingcircuit pump E in the Vitotrans 222 are switched OFF.Bearing in mind the stated set heating water and DHW temperatures,the Vitotrans 222 heat exchanger set can be operated up to a totalhardness of 3.6 mol/m 3 (total of alkaline earths).5AF F F FGBCHWVPROLSNE5414 646 GBUTA DHWB Hot water inlet from the heat exchangerDKC Vitotrans 222 heat exchanger setD Plate-type heat exchangerVITOCELL VIESMANN 21


Primary store systems — Vitocell 100-L with Vitotrans 222 (cont.)E Heating circuit pump (primary)F Air vent valveG Heating water flowH Heating water returnK BoilerL Temperature sensorN Mixer assemblyO Line regulating valveOperation with constant flow temperatureThe Vitotrans 222 heat exchanger set is operated without a mixerassembly. Limit the heating water temperature to 75 °C.The required DHW temperature and transfer output is set by adjustingthe circulating volume for the heating process at line regulating valveL to the output of the heat exchanger (or, if the available boiler outputis lower than that of the Vitotrans 222, according to the boiler output).High or medium draw-off rates are covered by the cylinder. Cold waterflows into the cylinder to replace the hot water drawn. The Vitotrans222 starts when the cold water strata inside the DHW cylinder reachestop thermostat T.P Check valveR Cylinder primary pump (secondary)S Safety valve *14T Cold water connection (common) with safety assembly toDIN 1988U Vitocell 100-L, (here: 500 litre capacity)V Lower cylinder temperature sensor (OFF)W Top cylinder temperature sensor (ON)The base load is covered by the constant output of the Vitotrans 222.Any additional hot water demand during peak times is covered by thecylinder volume.Either at the end of drawing or whilst DHW is drawn off, the cylindervolume is reheated to its set temperature via the Vitotrans 222. In thefully heated state (no drawing), cylinder primary pump N and heatingcircuit pump E in the Vitotrans 222 are switched OFF.Bearing in mind the stated set heating water and DHW temperatures,the Vitotrans 222 heat exchanger set can be operated up to a totalhardness of 3.6 mol/m 3 (total of alkaline earths).5A DHWB Hot water inlet from the heat exchangerC Vitotrans 222 heat exchanger setD Plate-type heat exchangerE Heating circuit pump (primary)F Air vent valveG Heating water flowH Heating water returnK Heat source with a constant flow temperature (e.g. district heating,max. 75 °C)L Line regulating valveM Check valveN Cylinder primary pump (secondary)O Safety valve *14P Cold water connection (common) with safety assembly toDIN 1988R Vitocell 100-L, (here: 500 litre capacity)S Lower control thermostat (OFF)T Top control thermostat (ON)Operation with a heat pump in conjunction with a heating lance for DHW heatingDuring cylinder heating (no draw-off), primary pump M within the cylinderprimary system withdraws cold water from the bottom of cylinderO; this is then heated in plate-type heat exchanger D and is re-suppliedto the cylinder via heating lance C fitted into flange B. Thegenerously sized outlet apertures in the heating lance result in low flowvelocities, which in turn provide a clean temperature stratificationinside the cylinder.*14 No replacement of the cylinder safety valve to DIN 1988.Fitting the optional electric immersion heater EHE (accessory) into thecylinder flange enables the DHW to be boosted further.22 VIESMANN VITOCELL5414 646 GB


Primary store systems — Vitocell 100-L with Vitotrans 222 (cont.)AMBABA DHWB Hot water inlet from the heat exchangerC Heating lanceD Plate-type heat exchangerE Air vent valveF Heating water flow from the heat pumpG Heating water return to the heat pumpH Heat pumpK Line regulating valveL Check valveM Cyl. primary pumpN Cold water connection (common) with safety assembly toDIN 1988O Vitocell 100-L, (here: 750/1000 litre capacity)P Cylinder temperature sensor of the heat pump5.3 General formulae for calculating the primary store systemWith reference to EN 12831,Q = Φ is used for heat volume and ² = L for heat output (continuousoutput) instead of the values currently used by DIN 4701.Calculation based on water volumeL · tV D = c · ΔTin lV ttl. = V D + V cyl. in l= n Z · ´ · t in lCalculation based on heat volumeΦ D = L · t in kWhΦ ttl. = V ttl. · ΔT · c in kWh= Φ cyl. + Φ D in kWh= V ttl. · ΔT · c = Φ cyl. + Φ DΦ cyl. = V cyl. · c · (T a – T e ) in kWh55414 646 GB5.4 Sample calculationA sports centre is equipped with 16 showers with a limitation to15 litres/min.According to design requirements, 8 showers are operated simultaneouslyfor up to 30 minutes in continuous operation. The drawingtemperature should be 40 ºC. A max. of 100 kW boiler output areavailable for DHW heating.c =spec. thermal capacity1 kWh860 l · Kn = Number of cylindersn Z = Number of draw-off pointsΦ D = Heat volume in kWh available by continuous outputL = Continuous output in kWΦ ttl. = Total heat demand in kWh (for production anddemand)Φ cyl. = Useable heat volume of the ttl. cylinder volume inkWhΦ cyl. ind. = Useable heat volume of a single cylinder in kWht = Time in hT a = Cylinder storage temperature in ºCT e = Cold water inlet temperature in °CΔT = Temperature differential between draw-off temperatureand cold water inlet temperature in K´ = Draw-off rate per draw-off point in l/hV D = DHW in litres heated by continuous outputV ttl. = Total draw-off volume in litresV cyl. = Useable cylinder capacity in litresVITOCELL VIESMANN 23


Primary store systems — Vitocell 100-L with Vitotrans 222 (cont.)Calculation of the cylinder size based on water volumeOver a period of 30 minutes, a total water volume V ttl. with a temperatureof 40 ºC is required.3600 l – 1433 l = 2167 lV ttl.= n Z · ´ · t= 8 showers · 15 l/min · 30 min= 3600 lAt a storage temperature of 60 ºC, the required cylinder volume V cyl.results.Of the 3600 litres, the 100 kW heat input can deliver a water volumeof V D over a period of 30 minutes.L · tV D = c · ΔTV D =100 kW · 0.5 h · 860 l · K1 kWh · (40 – 10) K=1433 lThis means that the cylinder must make the following water volumeavailable at a temperature of 40 ºC:V cyl. =2167 l · (40 – 10) K =1300 l(60 – 10) KThe calculated number n Vitocell 100-L each with a volume of 750 litreresults from the following:n =1300 l750 l= 1.73Selected cylinder primary system:2 Vitocell 100-L each with 750 litre capacity and 1 Vitotrans 222 heatexchanger set with a rated output of 120 kW (in accordance with max.boiler output according to the sample calculation, i.e. 100 kW).Calculation of the cylinder size based on heat volumeOver a period of 30 minutes (as per calculation) a total water volumeof 3600 litres at a temperature of 40 ºC is required. This correspondsto a heat volume of Φ ttl. .Φ ttl. = V ttl. · ΔT · c1 kWh= 3600 l · 30 K · 860 l · K= 126 kWhEach Vitocell 100-L cylinder with 750 litre capacity stores the followingheat volume Φ cyl. ind. :1 kWhΦ cyl. ind. = 750 l · (60 – 10) K ·860 l · K= 43.6 kWhThis results in the calculated number of cylinders (n).6The heat input can, over the drawing period of 30 minutes, provide aheat volume of Φ D .Φ D = L · t= 100 kW · 0.5 h = 50 kWhThis means that the DHW cylinder must store a heat volume of Φ cyl.Φ cyl. = Φ ttl. – Φ D= 126 kWh – 50 kWh = 76 kWhΦ cyl.n = Φcyl. ind.76 kWh= = 1.7443.6 kWhSelected cylinder primary system:2 Vitocell 100-L each with 750 litre cylinder capacity and 1 Vitotrans222 heat exchanger set with a rated output of 120 kW (in accordancewith max. boiler output according to the sample calculation, i.e.100 kW).Installation — DHW cylinders6.1 Connections on the DHW sideSee the figures on page 27 or 34 regarding the connection on theDHW side of DHW cylinders installed as a cylinder bank.NoteDishwashers and washing machines can be connected to the centralhot water supply.Connect separate cold and hot water connections to washingmachines. By feeding DHW directly from the DHW cylinder, the electricheating of the water by the dishwasher or washing machine is reduced,thereby saving time, energy and costs. Please follow the manufacturer'srecommendations.The DHW temperature in the piping downstream must be limited to60 ºC (according to the EnEV [Germany; check local regulations])through the installation of a suitable mixing device, e.g. a thermostaticmixing valve. This does not apply to DHW systems that demand highertemperatures for their intended use or that require a pipe length of lessthan 5 m.Please note:Consult the respective manufacturer's installation instructions whenfitting thermostatic mixing valves. The mixing device does not preventthe risk of scalding at the draw-off point. The installation of a mixer tapat the draw-off point is essential.Only for cylinder banks Vitocell 300-H:With DHW outlet temperatures in excess of 60 ºC, the connecting lineon the DHW side can, in multi-cylinder banks, also be connected inseries. Connect the connecting line on the heating water side as shownin the figures on page 32.5414 646 GB24 VIESMANN VITOCELL


Installation — DHW cylinders (cont.)Fittings that are installed in the connecting line must conform toDIN 1988 (see the figures on page 25) and DIN 4753 [or local regulations].These fittings comprise the following:■ Shut-off valves■ Drain valve■ Pressure reducer (according to DIN 1988-2 issue Dec. 1988)Install this device if the pressure in the pipework at the connectionpoint exceeds 80 % of the safety valve response pressure.It is advisable to install the pressure reducer immediately downstreamof the water meter. This creates nearly the same pressuresin the entire DHW system, which is thereby protected against overpressureand water hammer.According to DIN 4109, the static pressure of the water supply systemafter distribution over the various floors upstream of the fittingsshould not be higher than 5 bar (0.5 MPa).■ Safety valveThe system must be equipped with a type-tested diaphragm safetyvalve as protection against overpressure.Permiss. operating pressure: 10 bar.The connection diameter of the safety valve must be as follows:– up to 200 litre capacityat least R ½" (DN 15),max. heating input 75 kW,– above 200 to 1000 litre capacityat least R ¾" (DN 20),max. heating input 150 kW,– above 1000 to 5000 litre capacityat least R 1" (DN 25),max. heating input 250 kW.Install the safety valve in the cold water pipe. It must not be able tobe isolated from the DHW cylinder (or the cylinder bank). The pipeworkbetween the safety valve and the cylinder must not be restrictedin any way. The safety valve blow-off line must not be able to beclosed. Expelled water should be safely and visibly drained into asewer. Position a sign close to the safety valve blow-off line or onthe safety valve itself with the following inscription:"For safety reasons, water may be discharged from the blow-off lineduring heating. Never seal off!"Install the safety valve above the top edge of the cylinder.■ Non-return valveThis prevents system water and heated water from flowing back intothe cold water pipe or into the mains water supply.■ Pressure gaugeProvide a connection for a pressure gauge.■ Flow regulating valveWe recommend the installation of a flow regulating valve, and thatthe maximum water flow rate is adjusted in accordance with the 10minutes output of the DHW cylinder.■ Drinking water filterAccording to DIN 1988-2, a drinking water filter should be installedin systems with metal pipework. A drinking water filter should alsobe installed into plastic pipework. The installation of a drinking waterfilter prevents dirt from being introduced into the domestic watersystem.Vitocell 100-H and 300-H to 200 litre capacity6DHW connection to DIN 19885414 646 GBA DHWB DHW circulation lineC DHW circulation pumpD Spring-loaded check valveE Visible blow-off line outletF Safety valveVITOCELL VIESMANN 25


Installation — DHW cylinders (cont.)G Shut-off valveH Flow regulating valveK Pressure gauge connectionL Non-return valveM DrainN Cold waterO Drinking water filterP Pressure reducerR Non-return valve/pipe separatorS Diaphragm expansion vessel, suitable for drinking waterVitocell 300-H from 350 litre capacityDHW connection to DIN 1988A DHWB DHW circulation lineC DHW circulation pumpD Spring-loaded check valveE Visible blow-off line outletF Safety valveG Shut-off valveH Flow regulating valveK Pressure gauge connectionL Non-return valveM DrainN Cold waterO Drinking water filterP Pressure reducerR Non-return valve/pipe separatorS Diaphragm expansion vessel, suitable for drinking waterVitocell 100-V and 300-V6Connection of the DHW side in accordance with DIN 1988A DHWB DHW circulation lineC DHW circulation pumpD Spring-loaded check valveE Visible blow-off line outletF Safety valve5414 646 GB26 VIESMANN VITOCELL


Installation — DHW cylinders (cont.)G Shut-off valveH Flow regulating valveK Pressure gauge connectionL Non-return valveM DrainN Cold waterO Drinking water filterP Pressure reducerR Non-return valve/pipe separatorS Diaphragm expansion vessel, suitable for drinking waterConnection on the DHW side of cylinder banks with Vitocell 300-HNote■ Observe stacking height:Vitocell 300-H, 350 l: max. 2 cylindersVitocell 300-H, 500 l: max. 3 cylinders■ Observe the cross-sections of DHW connecting pipes.Vitocell 300-H with 1500 litre capacity (three cylinders)Vitocell 300-H with 700 or 1000 litre capacity (two cylinders)A DHWB 35 × 1.5 or R 1¼" *15C 42 × 1.5 or R 1½" *15D Cold waterVitocell 300-H with 2 x 700 or 2 x 1000 litre capacity (2 x two cylinders)A DHWB 35 × 1.5 or R 1¼" *15C 42 × 1.5 or R 1½" *15D Cold waterE 54 × 1.5 or R 2" *1565414 646 GBA DHWB 35 × 1.5 or R 1¼" *15C 42 × 1.5 or R 1½" *15D Cold waterE 54 × 1.5 or R 2" *15*15 Cross-sections of DHW connecting pipes.VITOCELL VIESMANN 27


Installation — DHW cylinders (cont.)Vitocell 300-H with 2 x 1500 litre capacity (2 x three cylinders) C 42 × 1.5 or R 1½" *15D Cold waterE 54 × 1.5 or R 2" *15F 70 × 2.0 or R 2½" *15A DHWB 35 × 1.5 or R 1¼" *1566.2 DHW circulation linesFor reasons of hygiene and convenience, DHW circulation lines areinstalled in DHW heating systems. Observe the applicable standardsand rules. Previously standard "gravity circulation" is now no longerpermissible for hygiene reasons. Fit DHW circulation lines or circulationsystems with appropriate pumps, hydraulically adjusted and thermallyinsulated in accordance with the applicable regulations. Take theapplicable standards and regulations into account (e.g. DVGW Codesof Practice W551/W553 and DIN 1988/TRWI).The flow rate of the circulation system is determined according to thescale of the pipework, the thermal insulation and the targeted orrequired maximum temperature differential between the cylinder outlet(DHW) and the circulation inlet (DHW circulation).Depending on the type of DHW heating system, there are various connectionoptions for the DHW circulation line. Virtually all DHW cylindersare fitted with connections for the DHW circulation line in the upperthird of the cylinder. The exception to this are DHW heating systemsin continuous operation such as freshwater stations or combinationcylinders with an integral DHW heat exchanger (Vitocell 340-M/360-M). They have a "threaded DHW circulation fitting", which means thatthe DHW circulation line is routed partially into the heat exchanger. Ifthis is not the case, the DHW circulation line can also be connected tothe cold water inlet of the DHW cylinder.Connecting to the cold water inlet is also an option for DHW cylinderswhere, due to the ratio of the draw-off rate and/or the flow rate of DHWcirculation to the cylinder volume, continuous cylinder contents mixingmust be expected. This applies for example to extremely small DHWcylinders (e.g. Vitocell 100-W 80 l, type CWG). Connecting to the coldwater inlet may also be advisable in the case of extremely high DHWcirculation flow rates. In poorly insulated pipework or extremely widelybranched systems in particular, extremely high flow rates may be necessary.It is then important to ensure that high flow velocities cannotlead to any settling inside the cylinder. The resulting mixing in thestandby part may lead, in some cases, to extremely long heat-up timesand fluctuating outlet temperatures (DHW). In this case too, connectingthe DHW circulation line to the cold water inlet may be advantageousin terms of the operating characteristics of the DHW heatingsystem.6.3 Connection of the DHW circulation line with cylinder banksConnect the DHW circulation line with detachable fittings.Install the cylinder banks with DHW circulation connected accordingto the figures from page 29 to ensure an even heating up of all individualcylinders.*15 Cross-sections of DHW connecting pipes.5414 646 GB28 VIESMANN VITOCELL


Installation — DHW cylinders (cont.)Installing the Vitocell 300-H as cylinder bankConnection with a simple DHW circulation lineA DHWB DHW circulationC Cold waterInstalling the Vitocell 300-H as cylinder bank6Connection to branched DHW circulation networksA DHWB DHW circulationC Cold water5414 646 GBVITOCELL VIESMANN 29


Installation — DHW cylinders (cont.)Installing the Vitocell 100-V and 300-V as cylinder bankConnection in conjunction with a district heating system without return temperature limit or in conjunction with boilers (low temperature operation)and a simple DHW circulation lineA Draw-off pointsB DHW circulation lineC DHWD DHW circulation pumpE Check valveF Cold waterInstalling the Vitocell 100-V and 300-V as cylinder bank6Connection in conjunction with condensing boilers or district heating systems without the return temperature limit and systems with branchedDHW circulation networksA Draw-off pointsB DHW circulation lineC DHWD DHW circulation pumpE Check valveF Cold water5414 646 GB30 VIESMANN VITOCELL


Installation — DHW cylinders (cont.)6.4 Connection on the heating water sideConnection on the heating water sideAccording to DIN 4753, the water in the DHW cylinder may be heatedto approx. 95 ºC.To ensure that the DHW temperature never exceed 95 ºC, install acontrol unit to regulate the heat supply in accordance with the followingcircuit diagrams.With the installation in accordance with the figures on page 31or 33, the cylinder primary pump is switched by the control thermostat.The spring-loaded check valve prevents continued heating of theDHW cylinder due to natural circulation.A water temperature regulator may also be used instead of the controlthermostat (see figures on page 33).When heating water flow temperatures above 110 ºC are employed,also fit a type-tested high limit safety cut-out. For this, the dual thermostatwith 2 separate thermostatic systems (temperature limiter andhigh limit safety cut-out) is used (see figures on page 33).Systems that already incorporate a high limit safety cut-out for limitingthe temperature of the heating medium to 110 ºC, (e.g. in the boiler),require no additional high limit safety cut-out in the DHW cylinder.Cylinder banksFor cylinder banks, it is sufficient to install a control thermostat in onlyone of the cylinders.Vitocell 300-H:With cylinder banks, implement the connections on the heating waterside and the arrangement of the control thermostat as well as the highlimit safety cut-out (if required) as shown in the figures on page 32.Vitocell 100-V and 300-V:The cylinder bank is controlled by one control thermostat. Therefore,the individual cylinders in a bank cannot be controlled separately.Install the control thermostat in the last cylinder as seen from the heatingwater flow (see the figures on page 34).NoteIf, contrary to the figure on page 34, the heating water flow is connectedon the right, install the sensor well for the control thermostatbefore the header is installed into the last cylinder as seen from theheating water flow.If individual cylinders in a cylinder bank must be controlled separately,group the cylinders into several cylinder banks or install them as individualcylinders.Vitocell 100-H and 300-HControl by starting/stopping the circulation pump.130, 160 and 200 litre capacity: Connection on the heating water side with one boiler6A Temperature sensor/control thermostat and high limit safety cutout(if required)B Air vent valveC Heating water returnD BoilerE Heating water flowF Circulation pumpG Spring-loaded check valveH Vitocell 100-H or 300-H5414 646 GBVITOCELL VIESMANN 31


Installation — DHW cylinders (cont.)350 and 500 litre capacity: Connection on the heating water side with one boilerA Temperature sensor/control thermostat and high limit safety cutout(if required)B Air vent valveC Heating water returnD BoilerVitocell 300-H as cylinder bankConnection on the heating water side and arrangement of the controlthermostatE Heating water flowF Circulation pumpG Spring-loaded check valveH Vitocell 100-H or 300-H2 x 700 or 2 x 1000 litre capacity (2 x two cylinders)NoteObserve the cross-sections of connecting pipes on the heating waterside.700 or 1000 litre capacity (two cylinders)6A Vitocell 300-HB Heating water flowC Heating water returnD High limit safety cut-out setting (if required)E Temperature sensor/control thermostatF DN 32 or R 1¼" *16G DN 50 or R 2" *16A Vitocell 300-HB Heating water flowC Heating water returnD High limit safety cut-out setting (if required)E Temperature sensor/control thermostatF DN 32 or R 1¼" *16G DN 50 or R 2" *16K DN 100 *16*16 Cross sections of heating water connection pipes.5414 646 GB32 VIESMANN VITOCELL


Installation — DHW cylinders (cont.)1500 litre capacity (three cylinders)E Temperature sensor/control thermostatF DN 32 or R 1¼" *16G DN 50 or R 2" *16H DN 80 *16L DN 125 *16Vitocell 300-V (type EVA)Heating water side connectionA Vitocell 300-HB Heating water flowC Heating water returnD High limit safety cut-out setting (if required)E Temperature sensor/control thermostatF DN 32 or R 1¼" *16G DN 50 or R 2" *16H DN 80 *162 x 1500 litre capacity (2 x three cylinders)Control by starting/stopping the circulation pumpA Air vent valveB Heating water flowC Vitocell 300-V (type EVA)D Spring-loaded check valveE Circulation pumpF BoilerG Heating water returnK Cylinder temperature sensor6Control via a control valve5414 646 GBA Vitocell 300-HB Heating water flowC Heating water returnD High limit safety cut-out setting (if required)*16 Cross sections of heating water connection pipes.B Heating water flowC Vitocell 300-V (type EVA)G Heating water returnH Sensor for DHW thermostatVitocell 100-V and Vitocell 300-V (type EVI)Heating water side connectionVITOCELL VIESMANN 33


Installation — DHW cylinders (cont.)Control by starting/stopping the circulation pumpA Air vent valveB Heating water flowC Vitocell 100-V or 300-V (type EVI)D Spring-loaded check valveE Circulation pumpF BoilerG Heating water returnK Temperature sensor/control thermostat and high limit safety cutout(if required)Control via a control valveB Heating water flowC Vitocell 100-V or 300-V (type EVI)G Heating water returnH Sensor for DHW thermostatVitocell 100-V and 300-V as cylinder bankConnections on the heating water side6A DHWB Temperature sensor/control thermostatC Heating water returnD Cold waterE Heating water flowF Air vent valveG DrainConnection on the heating water side with restriction of the return temperatureThe return temperature limiter must only be installed if required by therelevant district heating supplier.To ensure that the heating water return temperature does not fall belowa specified value, use a return temperature limiter with control valve(e.g. as offered by Samson, type 43-1, control range 25 to 70 ºC).For individual cylinders and cylinder banks, install the sensor as shownin the respective figures. The customer is responsible for installing thenecessary pipework.The control valve is sized according to the required heating water flowrate and the system pressure drop.NoteWhen return temperatures are restricted, a check must be carried outto determine whether the hygiene requirements in accordance withTRWI/DVGW are met. A transfer pump may have to be provided.Vitocell 100-V and Vitocell 300-V (type EVI)Installation of the sensor for limiting the return temperature into the heating water return for individual cylinders.5414 646 GB34 VIESMANN VITOCELL


Installation — DHW cylinders (cont.)R1¼A DHW thermostatB Gland fittingC TeeD Threaded fittingE Thermal insulationF Sensor for the return temperature limiterG Indirect coilH Heating water returnK Sensor for return temperature limitersL Sensor for DHW thermostatM Heating water flowVitocell 100-V and 300-V as cylinder bankInstallation of the sensor for limiting the return temperature in the heating water return.6A DHWB Gland fittingC Fem. connection R ½" EN 10241 (on-site)D HeaderE FlangeF Threaded flangeG Thermal insulationH Sensor for the return temperature limiterK Indirect coilL Sensor for DHW thermostatM Air vent valveN DrainO Sensor for return temperature limitersP Cold waterR Heating water returnS Heating water flow6.5 Sensor wellsThe sensor wells are welded into the DHW cylinder for the following DHW cylinders:5414 646 GBVITOCELL VIESMANN 35


Installation — DHW cylinders (cont.)Vitocell 100-HVitocell 300-V (type EVA) with 130 to 200 litre capacity150Ø 7aØ 9Ø 7Vitocell 100-V with 160 to 1000 litre capacityCylinder capacity l 130 160 200a mm 550 650 65016200Vitocell 300-H with 160 and 200 litre capacity175Ø 76Fit the sensor well supplied into the following DHW cylinders:Vitocell 300-H with 350 and 500 litre capacity:R ½"380SW 24Ø 19Ø 15Vitocell 300-V (type EVI) with 200 to 500 litre capacity:Cylinder capacity l 200 300 500a mm 220 220 330b mm 200 200 310For maximum operational reliability, the stainless steel sensor wellprovided should be used for the sensor or probe of the regulatingdevice.If the sensor to be used is too large or small for this sensor well, usea different stainless steel sensor well (1.4571 or 1.4435).aØ 19Ø 15R ½"b5414 646 GBSW 2436 VIESMANN VITOCELL


Installation — primary store system7.1 DHW connectionVersion 1 — primary store system with one Vitocell 100-L and Vitotrans 222 for modulating flow temperatures285A1A121 17 B 5220MOPA Draw-off points (DHW)B DHW circulation pumpC Vitotrans 222 heat exchanger set with mixer assemblyD Vitotronic 200-H (type HK1S, HK1W, HK3S and HK3W),Vitotronic 100 (type GC1),Vitotronic 200 (type GW1),Vitotronic 300 (type GW2) orVitotronic 300-KE Plate-type heat exchangerF Heating water flowNote■ Establish the cold water connection H with a tee with straight flowto the cold water connection of the Vitocell-L. Always establish thecold water connection to the Vitotrans 222 as a tee branch.■ In larger DHW circulation networks it may be necessary to brieflyswitch OFF the DHW circulation pump to enable heating up of theVitocell 100-L.G Heating water returnH Cold water connection (common) with safety assembly toDIN 1988K Vitocell 100-L, (here: 500 litre capacity)L Cylinder primary pump (secondary)N Spring-loaded check valveO Cylinder temperature sensor, top(ON, terminals "1" and "2")P Cylinder temperature sensor, bottom(OFF, terminals "2" and "3")Due to the necessary high flow temperatures of the heat source, neveruse a directly connected heating circuit without mixer.For optimum operation, disable the DHW cylinder priority control at thecontrol unit.75414 646 GBVITOCELL VIESMANN 37


Installation — primary store system (cont.)Version 2 — primary store system with several Vitocell 100-L in parallel and Vitotrans 222 for modulatingflow temperatures528A1A121 17 B 52 20MA Vitocell 100-L, (here: 500 litre capacity)B DHW circulation lineC DHW circulation pumpD Draw-off points (DHW)E Vitotrans 222 heat exchanger set with mixer assemblyF Vitotronic 200-H (type HK1S, HK1W, HK3S and HK3W),Vitotronic 100 (type GC1),Vitotronic 200 (type GW1),Vitotronic 300 (type GW2) orVitotronic 300-KG Plate-type heat exchangerH Heating water flowK Heating water returnL Cylinder primary pump (secondary)N Cold water connection (common) with safety assembly toDIN 1988O Spring-loaded check valveP Cylinder temperature sensor, top(ON, terminals "1" and "2")Q Cylinder temperature sensor, bottom(OFF, terminals "2" and "3")7NoteEstablish the cold water connection N with a tee with straight flow tothe cold water connection of the Vitocell-L. Always establish the coldwater connection to the Vitotrans 222 as a tee branch.Parallel operation is particularly suitable for systems where the dominantdesign criterion is a high peak output, e.g. for sports centres,swimming pools or shower rooms in commercial companies.Parallel operation makes it possible to extract the max. draw-off volumefrom each cylinder. The cylinders can be reheated in a short timeafter the hot water has been drawn off subject to a sufficiently high heatexchanger output being available.Due to the necessary high flow temperatures of the heat source, neveruse a directly connected heating circuit without mixer.For optimum operation, disable the DHW cylinder priority control at thecontrol unit.5414 646 GB38 VIESMANN VITOCELL


Installation — primary store system (cont.)Version 3 — primary store system with several Vitocell 100-L in parallel and Vitotrans 222 for constant flowtemperaturesA Vitocell 100-L, (here: 500 litre capacity)B DHW circulation lineC DHW circulation pumpD Time switchE Draw-off points (DHW)F Junction box (on-site)G Heating water flowH Heating water returnNoteEstablish the cold water connection N with a tee with straight flow tothe cold water connection of the Vitocell-L. Always establish the coldwater connection to the Vitotrans 222 as a tee branch.K Cylinder primary pump (secondary)L Plate-type heat exchangerM Vitotrans 222 heat exchanger setN Cold water connection (common) with safety assembly toDIN 1988O Top control thermostat (ON)P Lower control thermostat (OFF)Q Spring-loaded check valveDue to the necessary high flow temperatures of the heat source, neveruse a directly connected heating circuit without mixer.75414 646 GBVITOCELL VIESMANN 39


Installation — primary store system (cont.)Version 4 — primary store system with several Vitocell 100-L in series and Vitotrans 222 for modulatingflow temperatures285A1A121 17 B 52 20MA Vitocell 100-L, (here: 500 litre capacity)B DHW circulation lineC DHW circulation pumpD Draw-off points (DHW)E Vitotrans 222 heat exchanger set with mixer assemblyF Vitotronic 200-H (type HK1S, HK1W, HK3S and HK3W),Vitotronic 100 (type GC1),Vitotronic 200 (type GW1),Vitotronic 300 (type GW2) orVitotronic 300-KG Plate-type heat exchangerH Heating water flowK Heating water returnL Cylinder primary pump (secondary)N Cold water connection (common) with safety assembly toDIN 1988O Spring-loaded check valveP Cylinder temperature sensor, top(ON, terminals "1" and "2")Q Cylinder temperature sensor, bottom(OFF, terminals "2" and "3")7Note■ Establish the cold water connection N with a tee with straight flowto the cold water connection of the Vitocell-L. Always establish thecold water connection to the Vitotrans 222 as a tee branch.■ In order to ensure a fault-free heating operation, observe that theresidual head of cylinder primary pump L is greater than that ofDHW circulation pump C, giving due consideration to the pipeworkpressure drop.Use series operation if relatively continuous DHW demand can beexpected, e.g. larger apartment blocks.Note the max. draw-off rate when sizing for DHW heating. The max.flow velocity to DIN 1988 should not be higher than 2 m/s (affects thestratification inside the cylinder).The advantages of series operation are particularly apparent whencombining several lower heat exchanger outputs and a large cylindervolume, since a high cylinder volume permits the use of smaller boilersor district heating ratings.Due to the necessary high flow temperatures of the heat source, neveruse a directly connected heating circuit without mixer.For optimum operation, disable the DHW cylinder priority control at thecontrol unit.5414 646 GB40 VIESMANN VITOCELL


Installation — primary store system (cont.)7.2 ConnectionsConnection of the Vitotrans 222 (accessory) on the DHW side in conjunction with one Vitocell 100-L(connection to DIN 1988)5414 646 GBA Draw-off points (DHW)B DHW circulation lineC DHW circulation pumpD Spring-loaded check valveE Visible blow-off line outletF Safety valveG Shut-off valveH Flow regulating valveK Pressure gauge connectionNote■ The pipework downstream of the Vitotrans 222 (in flow direction)must not be made from galvanised steel pipes.■ Establish the cold water connection with a tee with straight flow tothe cold water connection of the Vitocell-L. Always establish the coldwater connection to the Vitotrans 222 as a tee branch.■ The safety valve underneath the Vitotrans 222 does not replace thesafety valve of the safety assembly to DIN 1988.The following are part of the safety assembly according to DIN1988:■ Shut-off valves■ Drain valve■ Pressure reducerInstall this device if the pressure in the pipework at the connectionpoint exceeds 80 % of the safety valve response pressure.It is advisable to install the pressure reducer immediately downstreamof the water meter. This creates nearly the same pressuresin the entire DHW system, which is thereby protected against overpressureand water hammer.According to DIN 4109, the static pressure of the water supply systemafter distribution over the various floors upstream of the fittingsshould not be higher than 5 bar (0.5 MPa).L Non-return valveM DrainN Cold waterO Drinking water filterP Pressure reducerR Non-return valve/pipe separatorS Diaphragm expansion vessel, suitable for drinking waterT Vitotrans 222■ Safety valveThe system must be equipped with a type-tested diaphragm safetyvalve as protection against overpressure.Permiss. operating pressure: 10 bar.The connection diameter of the safety valve must be as follows:– for 500 to 1000 litres cylinder capacity at least R ¾" (DN 20), max.heat input 150 kW– above 1000 to 5000 litres cylinder capacity at least R 1" (DN25),max. heat input 250 kWInstall the safety valve in the cold water pipe. It must not be able tobe isolated from the DHW cylinder. The pipework between the safetyvalve and the cylinder must not be restricted in any way. The safetyvalve blow-off line must not be able to be closed. Expelled watershould be safely and visibly drained into a sewer. Position a signclose to the safety valve blow-off line or on the safety valve itself withthe following inscription:"For safety reasons, water may be discharged from the blow-off lineduring heating. Never seal off!"Install the safety valve above the top edge of the cylinder.■ Non-return valveThis prevents system water and heated water from flowing back intothe cold water pipe or into the mains water supply.■ Pressure gauge (pressure gauge)Provide a connection for a pressure gauge.7VITOCELL VIESMANN 41


Installation — primary store system (cont.)■ Flow regulating valveWe recommend the installation of a flow regulating valve, and thatthe maximum water flow rate is adjusted in accordance with the 10minutes output (see table in the datasheet).■ Drinking water filterAccording to DIN 1988-2, a drinking water filter should be installedin systems with metal pipework. A drinking water filter should alsobe installed into plastic pipework. The installation of a drinking waterfilter prevents dirt from being introduced into the domestic watersystem.Connections on the heating water sideHVWW/WTHRMKWA Vitocell 100-L, (here: 500 litre capacity)B Air vent connectorC Vitotrans 222D BoilerE Cold water connection (common) with safety assembly toDIN 1988F Draw-off points (DHW)HR Heating water returnHV Heating water flowKW Cold waterWW/WT Hot water inlet from the heat exchanger7.3 Sample applications7Primary store systems under various connection conditionsThe cylinder primary system can be integrated into systems with variousoperating parameters and control systems.The electrical wiring and the hydraulic connection of the cylinder primarysystem must be matched to the hydraulic and the control systemconditions.Possible installation of the cylinder primary system in conjunctionwith:■ Vitotronic boiler control units (modulating boiler operation)■ Vitotronic 200-H with external control units and modulating boileroperation■ Constant flow temperatures (e.g. standard boiler)■ District heating.Corresponding water and wiring designs are shown on the followingpages.NoteIn multi-boiler systems, connect the cylinder primary system to theVitotronic 300-K.5414 646 GB42 VIESMANN VITOCELL


Installation — primary store system (cont.)Sample application 1 – Vitocell 100-L with Vitotrans 222 and boiler with Vitotronic(modulating boiler operation)5A1A121 17 B 52 2040MA Power supply connection 230 V/50 Hz; install a main isolator inline with regulationsB Heating circuit pump (primary)C Flow distributor (under pressure)The cylinder temperature sensor PT500, which is part of the standarddelivery of the Vitotronic (accessory for Vitotronic 200-H and Vitotronic100), is supplemented by a second cylinder temperature sensorPT500 (standard delivery with the mixer assembly).The upper cylinder temperature sensor is connected across terminals"1" and "2", the lower one across terminals "2" and "3" of plug %.D Return collectorE Additional motorised valve in the flow to the Vitotrans 222 whenthe differential pressure between the flow distributor and thereturn collector > 3 barUse of output sÖ as primary pump for the heat exchanger set.Set code "4E : 1":Use of output gS as primary control for the heat exchanger set.Set code "55 : 3":Use of the cylinder thermostat for the heat exchanger set.System-specific coding at the Vitotronic 4Set code "4C : 1":Required componentsPos. Description Quantity Part no.1 Vitocell 100-L, 500 litre (shown), or subject to system Z002 074Vitocell 100-L, 750 litre, or subject to system Z004 042Vitocell 100-L, 1000 litre subject to system Z004 0432 Vitotrans 222– up to 80 kW 1 7143 564– up to 120 kW 1 7143 565– up to 240 kW 1 7143 5663 Mixing assembly (incl. three-way mixing valve, servomotor, sensors, pipework) for theVitotrans 222– up to 120 kW 1 7143 567– up to 240 kW 1 7143 5684 In conjunction with the Vitotronic 200-H, type HK1S, HK1W, HK3S and HK3W and the Vitotronic100, type GC1:Cylinder temperature sensor (PT 500)1 7450 63375414 646 GBVITOCELL VIESMANN 43


Installation — primary store system (cont.)Sample application 2 – Vitocell 100-L with Vitotrans 222 and a third party control unit(for modulating boiler operation)5 21 17 52 20A1A140MA Power supply connection 230 V/50 Hz; install a main isolator inline with regulationsB Flow distributor (under pressure)C Return collectorD Zero volt contact for burner start by the external controlE Additional motorised valve in the flow to the Vitotrans 222 whenthe differential pressure between the flow distributor and thereturn collector > 3 bar7In conjunction with the external control unit, the cylinder primary pumpwill be regulated by the Vitotronic 200-H (type HK1S, HK1W, HK3S orHK3W).The upper cylinder temperature sensor is connected across terminals"1" and "2", the lower one across terminals "2" and "3" of plug %.System-specific coding at the Vitotronic 4Set code "4C : 1":Use of output sÖ as primary pump for the heat exchanger set.Set code "4E : 1":Use of output gS as primary control for the heat exchanger set.Set code "55 : 3":Use of the cylinder thermostat for the heat exchanger set.Set code "9F : 1" if no outside temperature sensor is connected (e.g.Vitotronic 200-H, type HK1, only regulates the Vitotrans 222). At theVitotronic 200-H for heating circuit 1, connect a flow temperature sensoror a fixed resistor of approx. 560 Ω.Contactor relay connectionLKK20M1~NDø øRequired componentsPos. Description Quantity Part no.1 Vitocell 100-L, 500 litre (shown), or subject to system Z002 074Vitocell 100-L, 750 litre, or subject to system Z004 042Vitocell 100-L, 1000 litre subject to system Z004 0432 Vitotrans 222– up to 80 kW 1 7143 564– up to 120 kW 1 7143 565– up to 240 kW 1 7143 5663 Mixing assembly (incl. three-way mixing valve, servomotor, sensors, pipework) for theVitotrans 222– up to 120 kW 1 7143 567– up to 240 kW 1 7143 5684 Vitotronic 200-H, type HK1S, HK1W, HK3S and HK3W 1 see pricelist5 Contactor relay 1 7814 68155414 646 GB44 VIESMANN VITOCELL


Installation — primary store system (cont.)Pos. Description Quantity Part no.6 Cylinder temperature sensor 1 7450 6337 Feed pump (distributor) subject to system on-siteSample application 3 – Vitocell 100-L with Vitotrans 222 and constant flow temperaturesMA Power supply connection 230 V/50 Hz; install a main isolator inline with regulationsB Heating circuit pump (primary)The cylinder heating will be called for by the upper thermostat. Thelower thermostat terminates the cylinder heating.You can select the temperature at the thermostat.Example:Max. 55 ºC ON, 50 ºC OFF (at heat-up temperature 60 ºC).C Cylinder primary pump (secondary)D Flow distributor (under pressure)E Return collectorInstall a motorised valve into the flow pipe when connecting theVitotrans 222 heat exchanger sets for constant flow temperatureswithout mixer assembly to a flow distributor (under pressure) (boilerwith heating circuit pump to distributor). The motorised valve will beclosed during non-heating periods, so preventing a forced flow throughthe Vitotrans 222 during such periods.Required componentsPos. Description Quantity Part no.1 Vitocell 100-L, 500 litre (shown), or subject to system Z002 074Vitocell 100-L, 750 litre, or subject to system Z004 042Vitocell 100-L, 1000 litre subject to system Z004 0432 Vitotrans 222– up to 80 kW 1 7143 564– up to 120 kW 1 7143 565– up to 240 kW 1 7143 5663 Junction box 1 on-site4 Contactor relay *17 1 7814 6815 Control thermostat 2 7151 9896 Motorised valve *17 1 on-site75414 646 GB*17 Only required for pressurised flow distributors.VITOCELL VIESMANN 45


Installation — primary store system (cont.)Wiring diagram for connecting the control thermostat, the contactor relay and the motorised valveLANPE312 312 3 M1~M1~M1~554 6 B CThe motorised valve 6 is only required for pressurised flow distributors.Legends and required components, see page 45.75414 646 GB46 VIESMANN VITOCELL


Appendix8.1 Questionnaire regarding the sizing of DHW cylindersDHW cylinders in DHW heating systems81 2Address Basic detailsName Required cylinder°CtemperatureStreet Flow temperature of°Cthe heat sourcePostal code/Town Spread (Δt) = optimised KTelephone(for any queries)Date = Required heating output is calculated with EDISProject = Max. available heating output KW3Selection of calculation method= ApartmentsType of accommodation N L factor Quantity1-2 room studio apartment with shower 0.713-room apartment with standard bath 0.77Standard residential unit with standard bath 1.00Standard residential unit with deluxe bath 1.12Deluxe apartment with standard bath and shower 1.63Standard residential unit with guest room 1.89Other= Hotels and guest housesEquipment Demand (kWh) QuantitySingle room with 1 bath and 1 washbasin 7.0Single room with 1 shower and 1 washbasin 3.0Single room with 1 washbasin 0.8Double room with 1 bath and 1 washbasin 10.5Double room with 1 shower and 1 washbasin 4.5Double room with 1 washbasin 1.2Covers 0.6Hotel category (star rating)Demand period HoursHeat-up time Hours= Gastronomic businesses (restaurant, canteen, dining hall, etc.)Location of catering = Restaurant = Canteen = OtherDHW demandNumber of covers Number of draw-offDemand periodpointsLitres/coverHours5414 646 GB= Hospitals and clinicsNumber of beds DHW demand (45 °C) Litres/bedNumber of additional draw-off events DHW demand (45 °C) Litres/draw-off eventNumber of draw-off points total Demand period HoursVITOCELL VIESMANN 47


Appendix (cont.)8= Common accommodation (residential home, barracks, etc.)Number of occupants Shower frequency Number of users/hour and showerNumber of showers DHW demand (45 °C) Litres/shower takenNumber of additional draw-off events DHW demand Litres/draw-off eventNumber of additional draw-off events= Retirement home, nursing homeNumber of beds DHW demand (45 °C) Litres/bedNumber of covers DHW demand (45 °C) Litres/coverNumber of additional draw-offDemand periodHourspointsNumber of draw-off points perroom= Campsite, recreational campNumber of campers Shower frequency Number of users/hour and showerNumber of showers DHW demand Litres/shower takenNumber of additional draw-offpointsDHW demand (45 °C)Litres/draw-off point= Leisure facilities (leisure/sports centre, swimming pool, etc.)Number of showers Heat-up time minutesDemand period minutes Shower time minutesDHW demand/shower (40 °C) Litres/minute= Commercial enterprisesNumber of employees Activity = Slightly dirty = Moderately = Very dirtydirtyConsumption point DHW volume (litres/minute) QuantityWashbasins with tap 8.50Washbasins with spray head 4.50Circular communal washbasin for 6 persons 20.00Circular communal washbasin for 10 persons 25.00Shower unit without changing cubicle 9.50Shower unit with changing cubicle 9.50Demand period HoursHeat-up time Hours4Selected DHW cylinders= Vitocell 100, type: .......................................= Vitocell 300, type: .......................................5414 646 GB48 VIESMANN VITOCELL


Appendix (cont.)8.2 Checklist for heat exchanger enquiries/sizingPurpose: Water/water= System separation, underfloor heating system= System separation, district heating system= DHW heating= Elsewhere:System temperaturesprimary secondaryInlet °C Inlet °COutlet °C Outlet °COutput kWLimits (e.g. max.)Pressure dropprimary mbar secondary mbarLimitsPressure stages barLimitsTemperatures °CSpecial conditions?8Specification of heat exchanger type= System separation, underfloor heating system= System separation, district heating system8.3 Checklist for heat exchanger enquiries/sizingPurpose: Steam/water= System separation, district heating system= Elsewhere:Saturated steam pressure/system temperaturesprimary secondarySteam pressure bar Inlet °CCondensate outlet °C Outlet °COutput kWLimits (e.g. max.)Pressure dropprimary mbar secondary mbarLimitsPressure stages barLimitsTemperatures °CSpecial conditions?Specification of heat exchanger typeTubular heat exchanger= vertical= horizontal (Viessmann only supplies vertical version)5414 646 GBVITOCELL VIESMANN 49


Keyword indexBBoiler supplement Zk.......................................................................14CCalculation of the primary store system...........................................23Checklist for heat exchanger enquiries/sizing..................................49Circulation pump for cylinder heating, sizing....................................19Connected output, calculating..........................................................18Connection conditions of primary store systems..............................42Connection of the Vitotrans 222 on the DHW side...........................41Connection on DHW side in accordance with DIN 1988..................26Connection on the DHW side of cylinder banks...............................27Connection on the heating water side..............................................31Connections of the Vitotrans 222 on the heating water side............42Connections on the DHW side.........................................................24DDemand factor N, calculating...........................................................12DHW circulation lines.......................................................................28DHW circulation line with cylinder banks.........................................28DHW demand in commercially utilised sauna operation..................16DHW demand in commercial operations..........................................15DHW demand in connection with district heating systems...............18DHW demand in hotels, guest houses and residential homes.........16DHW demand in leisure/sports centres............................................17DHW demand in residential buildings..............................................11DIN 4708-2.......................................................................................11District heating water volume, calculating........................................18Drain valve.......................................................................................25Draw-off demand..............................................................................12Drinking water filter..........................................................................25EEDIS calculation program................................................................11FFlow rate on the heating water side, calculating..............................20Flow regulating valve.......................................................................25HHeat demand■ for DHW in commercially utilised sauna operation.......................16■ for DHW in commercial operations...............................................15■ for DHW in connection with district heating systems....................18■ for DHW in hotels, guest houses and residential homes..............16■ for DHW in leisure/sports centres.................................................17■ for DHW in residential buildings....................................................11Heating output, calculating...............................................................15Heating water flow rate, calculating.................................................19Heat-up output, calculating........................................................16, 17IInstallation of DHW cylinders...........................................................24Installation of primary store system..................................................37NNon-return valve...............................................................................25OOccupancy rate p, calculating..........................................................11Overview of product features.............................................................7PPressure drop on the heating water side, calculating......................19Pressure gauge................................................................................25Pressure reducer..............................................................................25Primary store system, calculation....................................................23Primary store system, function description......................................21Primary store system, installation....................................................37Primary store systems......................................................................20Product features, overview.................................................................7Product information............................................................................5QQuestionnaire regarding the sizing of DHW cylinders......................47RRestriction of the return temperature...............................................34SSafety valve......................................................................................25Sample applications.........................................................................42Selection diagrams, DHW cylinder.....................................................8Selection of DHW cylinder■ according to continuous output.......................................................9■ according to demand factor N.........................................................7Sensor wells.....................................................................................35Shut-off valves.................................................................................25Sizing according to continuous output.............................................18Sizing DHW cylinders.......................................................................11Sizing of DHW cylinders, questionnaire...........................................475414 646 GB50 VIESMANN VITOCELL


5414 646 GBVITOCELL VIESMANN 51


Printed on environmentally friendly,chlorine-free bleached paperSubject to technical modifications.Viessmann Werke GmbH&Co KGD-35107 AllendorfTelephone: +49 6452 70-0Fax: +49 6452 70-2780www.viessmann.comViessmann LimitedHortonwood 30, TelfordShropshire, TF1 7YP, GBTelephone: +44 1952 675000Fax: +44 1952 675040E-mail: info-uk@viessmann.com5414 646 GB52 VIESMANN VITOCELL

More magazines by this user
Similar magazines