for contractors For natural gas and LPG VIESMANN Type … 050 BPJD... · or by means of a mains...

Installation and serviceinstructionsfor contractors

VIESMANN

Vitodens 050-WType BPJD, 6.5 to 35.0 kWWall mounted gas condensing boilerFor natural gas and LPG Gas Council Number: 47 819 31, 47 819 32

For applicability, see the last page

VITODENS 050-W

5675 991 GB 2/2015 Please keep safe.

2

Please follow these safety instructions closely to prevent accidents and mate-rial losses.

Safety instructions explained

DangerThis symbol warns against therisk of injury.

! Please noteThis symbol warns against therisk of material losses and envi-ronmental pollution.

NoteDetails identified by the word "Note" con-tain additional information.

Target group

These instructions are exclusively inten-ded for authorised contractors.■ Work on gas installations must only be

carried out by a registered gas fitter.■ Work on electrical equipment must

only be carried out by a qualified elec-trician.

■ The system must be commissioned bythe system installer or a qualified per-son authorised by the installer.

Regulations to be observed

■ National installation regulations■ Statutory regulations for the preven-

tion of accidents■ Statutory regulations for environmen-

tal protection

■ Codes of practice of the relevant tradeassociations

■ All current safety regulations asdefined by DIN, EN, DVGW, TRGI,TRF, VDE and all locally applicablestandardsa ÖNORM, EN, ÖVGW-TR Gas,

ÖVGW-TRF and ÖVEc SEV, SUVA, SVGW, SVTI,

SWKI, VKF and EKAS guideline1942: LPG, part 2

Safety instructions for working on thesystem

Working on the system

■ Where gas is used as the fuel, closethe main gas shut-off valve and safe-guard it against unintentional reopen-ing.

■ Isolate the system from the power sup-ply, e.g. by removing the separate fuseor by means of a mains isolator, andcheck that it is no longer 'live'.

■ Safeguard the system against recon-nection.

DangerHot surfaces can cause burns.■ Before maintenance and serv-

ice work, switch OFF the appli-ance and let it cool down.

■ Never touch hot surfaces onthe boiler, burner, flue systemor pipework.

Safety instructions

Safety instructions

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! Please noteElectronic assemblies can bedamaged by electrostatic dis-charge.Prior to commencing work, touchearthed objects such as heatingor water pipes to discharge staticloads.

Repair work

! Please noteRepairing components that fulfil asafety function can compromisethe safe operation of the sys-tem.Replace faulty components onlywith genuine Viessmann spareparts.

Auxiliary components, spare andwearing parts

! Please noteSpare and wearing parts thathave not been tested togetherwith the system can compromiseits function. Installing non-author-ised components and makingnon-approved modifications orconversions can compromisesafety and may invalidate ourwarranty.For replacements, use only orig-inal spare parts supplied orapproved by Viessmann.

Safety instructions for operating thesystem

If you smell gas

DangerEscaping gas can lead to explo-sions which may result in seriousinjury.■ Never smoke. Prevent naked

flames and sparks. Neverswitch lights or electrical appli-ances on or off.

■ Close the gas shut-off valve.■ Open windows and doors.■ Evacuate any people from the

danger zone.■ Notify your gas or electricity

supply utility from outside thebuilding.

■ Have the power supply to thebuilding shut off from a safeplace (outside the building).

If you smell flue gas

DangerFlue gas can lead to life threat-ening poisoning.■ Shut down the heating system.■ Ventilate the installation site.■ Close doors to living spaces to

prevent flue gases fromspreading.

Safety instructions

Safety instructions (cont.)

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What to do if water escapes from theappliance

DangerWhen water escapes from theappliance there is a risk of elec-trocution.Switch off the heating system bymeans of an external isolator (forexample fuse box, domesticpower distribution).

Flue systems and combustion air

Ensure that flue systems are clear andcannot be sealed, for instance due toaccumulation of condensate or othercauses. Ensure an adequate supply ofcombustion air.Instruct system users that subsequentmodifications to the building characteris-tics are not permissible (e.g. cable/pipe-work routing, cladding or partitions).

DangerLeaking or blocked flue systems,or an inadequate supply of com-bustion air can cause life threat-ening poisoning from carbonmonoxide in the flue gas.Ensure the flue system is in goodworking order. Apertures for sup-plying combustion air must benon-closable.

Extractors

Operating appliances that extract air tothe outside (cooker hoods, extractors, airconditioning units, etc.) can create neg-ative pressure. If the boiler is operated atthe same time, this can lead to reverseflow of the flue gas.

DangerThe simultaneous operation ofthe boiler and appliances thatextract air to the outside canresult in life threatening poison-ing due to reverse flow of the fluegas.Fit an interlock circuit or take suit-able steps to ensure an adequatesupply of combustion air.

Safety instructions

Safety instructions (cont.)

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Installation instructionsInformationSymbols................................................................................................................ 7Intended use......................................................................................................... 8Product information.............................................................................................. 8Disposal of packaging.......................................................................................... 10

Preparing for installation................................................................................... 11

Installation sequenceMounting the boiler and making the connections................................................. 15Opening the programming unit............................................................................. 20Electrical connections........................................................................................... 21

Service instructionsCommissioning, inspection, maintenanceSteps - commissioning, inspection and maintenance.......................................... 24Further details regarding the individual steps....................................................... 25

TroubleshootingFunction sequence and possible faults................................................................ 47Fault display......................................................................................................... 48Repairs................................................................................................................. 53

Gas type conversionConverting from LPG to natural gas..................................................................... 63

Control unitFunctions and operating conditions in weather-compensated mode................... 65

DesignsConnection and wiring diagrams.......................................................................... 67

Parts listsOrdering parts...................................................................................................... 72Overview of assemblies....................................................................................... 73Casing assembly.................................................................................................. 74Heat cell assembly............................................................................................... 75Burner assembly.................................................................................................. 77Hydraulic assembly.............................................................................................. 79Grundfos hydraulic assembly............................................................................... 81Control unit assembly........................................................................................... 83

Index

Index56

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Miscellaneous assembly...................................................................................... 85

Specification....................................................................................................... 86

CertificatesDeclaration of conformity...................................................................................... 87

Keyword index.................................................................................................... 88

Index

Index (cont.)

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Sym-bol

Meaning

Reference to other documentcontaining further information

1.Step in a diagram:The numbers correspond to theorder in which the steps are car-ried out.

Warning of material losses andenvironmental pollution Live electrical area Pay particular attention. ■ Component must audibly

click into place.or

■ Acoustic signal■ Fit new component.

or■ In conjunction with a tool:

Clean the surface.Dispose of component correct-ly. Dispose of component at a suit-able collection point. Do notdispose of component in do-mestic waste.

Information

Symbols56

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The appliance is only intended to beinstalled and operated in sealed unven-ted heating systems that comply withEN 12828, with due attention paid to theassociated installation, service andoperating instructions. It is only designedfor the heating of water that is of potablewater quality.

Intended use presupposes that a fixedinstallation in conjunction with permissi-ble, system-specific components hasbeen carried out.

Commercial or industrial usage for a pur-pose other than heating the building orDHW shall be deemed inappropriate.

Any usage beyond this must beapproved by the manufacturer in eachindividual case.

Incorrect usage or operation of the appli-ance (e.g. the appliance being openedby the system user) is prohibited and willresult in an exclusion of liability. Incorrectusage also occurs if the components inthe heating system are modified fromtheir intended use (e.g. if the flue gas andventilation air paths are sealed).

Product information

Vitodens 050-W, type BP JD

Preset for operation with natural gas.Conversion to LPG P requires a gas con-version kit.

Gas Council No.■ 29 kW combi: 47 819 31■ 35 kW combi: 47 819 32

Conversion for other countries

The Vitodens 050-W must only be deliv-ered to the countries specified on thetype plate. For deliveries to alternativecountries, an approved contractor mustarrange individual approval on his/herown initiative and in accordance with thelaw of the country in question.

Product description

The Vitodens 050-W is available as agas condensing combi boiler with inte-gral plate heat exchanger for DHW heat-ing. For the connection of heating circuitsand DHW line, see page 14 onwards.The Vitodens 050-W is set up for opera-tion with a constant boiler water temper-ature.The appliance is equipped with a sealedunvented hydraulic system with 2 con-nections for heating flow and return and2 connections for DHW heating.

Information

Intended use

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The following components are integra-ted into the hydraulic system:■ Circulation pump■ 3-way diverter valve■ Safety valve■ Diaphragm expansion vessel■ Plate heat exchanger for DHW heating

Connecting accessories

A time switch (accessories) can be con-nected to the control unit with a low volt-age supply.

Siting

Suitable siting locations include:■ Recreational rooms and other living

spaces■ Ancillary rooms without own ventila-

tion

■ Cupboards (open at the top)■ Recesses without compulsory clear-

ance towards combustible materials■ Attic rooms (pitched attics and long

panes) where the balanced flue pipecan be routed directly through the roof

Since the flue pipe connection for room-sealed operation is surrounded by com-bustion air (coaxial pipe), no clearancestowards combustible materials need bemaintained. For further details, see thetechnical guide on flue systems for theVitodens.The installation area must be safe fromthe risk of frost.

Operation of the Vitodens 050-W in wet rooms

Area 0

Area 1Area

2

Area 2

600

2250

The Vitodens is approved for installationin wet rooms (e.g. bathroom or showerrooms) (protection IP X4 D, splash-proof).

Information

Product information (cont.)

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When installing the Vitodens in wetareas, observe the safety zones andminimum wall clearances according toVDE 0100 [or local regulations] (see also"Electrical safety zone"). The Vitodensmay be installed in safety zone 1 ifhosed water (e.g. from massage show-ers) is prevented.Electrical equipment in rooms containinga bathtub or a shower must be installedin such a way that users cannot beexposed to dangerous body currents.

VDE 0100 specifies that cables supply-ing permanently installed consumers inzones 1 and 2 should only be run verti-cally and routed into the equipment fromthe back.

Disposal of packaging

Please dispose of waste packaging inline with statutory regulations.

Information

Product information (cont.)

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Preparing for boiler installation

Dimensions and connections

41

5

250

400

58 58123123

BA C E

F

D

156350

125

867

6870

715

064

2

F

700

Shown without fittings

A Heating flow 7 22 mmB DHW 7 15 mmC Gas connection 7 22 mmD Cold water 7 15 mm

E Heating return 7 22 mmF Condensate drain/safety valve

drain: Plastic hose 7 22 mm

Preparing for installation

Preparing for installation56

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Minimum clearances

Maintain a clearance of 700 mm in frontof the Vitodens for maintenance purpo-ses. Maintenance clearances to the l.h.or r.h. side of the Vitodens are notrequired.


Preparing for installation (cont.)

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Fitting the wall mounting bracket

250

A

Ø10 145

A Vitodens installation template

1. Position the supplied installation tem-plate on the wall.

2. Mark out the rawl plug holes.



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3. Drill 7 10 mm holes and insert therawl plugs supplied.

4. Fit wall mounting bracket with screwssupplied.

Fitting the pre-plumbing jig or mount-ing frame

Pre-plumbing jig or mountingframe installation instructions

Preparing the connections

! Please noteTo prevent appliance damage,connect all pipework free of loadand torque stress.

1. Prepare the water connections. Flushthe heating system.

2. Prepare the gas connection.

3. Prepare the electrical connections.■ The appliance is delivered fitted

with a 1.5 m long power cable:NYM-J 3 x 1.5 mm2

■ Accessory cables:NYM-O 2-core min. 0.5 mm2 or 2-core cable for LV

Installation in a cupboard

Any cupboard enclosing the appliancemust be designed and constructed spe-cifically for this purpose. An existing cup-board or closet may be used, provided itis modified accordingly. BS 7698:2000gives details of the essential design fea-tures for cupboards and closets, includ-ing airing cupboards. The Vitodensrange does not require the cupboard tobe ventilated.



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Removing the front panel and mounting the boiler

2x

1.

2.

3.

1. Undo the screws at the bottom of theboiler; do not remove completely.

2. Remove the front panel.

3. Hook the boiler onto the wall mount-ing bracket.

Installation sequence

Mounting the boiler and making the connections56

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Making the connections on the water side

A

¨

z z

B C D

A Heating flow G ¾B DHW G ½

C Cold water G ½D Heating return G ¾

1. Mount fittings with gaskets. 2. Install filling equipment on site. The filling equipment must meet theFittings Directive G24.2a.


Mounting the boiler and making the connections (cont.)

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Gas connection

A

¨

z z1. Mount gas shut-off valve with bend to

connection A.

2. Connect gas supply to connectionA.

3. Carry out a tightness test.

NoteOnly use suitable and approved leakdetection agents (EN 14291) anddevices for the tightness test. Leakdetection agents with unsuitable con-stituents (e.g. nitrides, sulphides) cancause material damage.Remove leak detection agent resi-dues after testing.



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! Please noteExcessive test pressure willdamage the boiler and the gastrain. Max. test pressure 150 mbar(15 kPa). If a higher pressureis required for tightness tests,disconnect the boiler and thegas train from the main supplypipe (undo the fitting).

4. Purge the gas line.

Connecting the safety valve and condensate drain

A

■ The condensate pipe is connected tothe discharge pipe of the safety valve.The supplied condensate hose meetsthe temperature requirements for CEcertification.

■ We recommend connecting the con-densate pipe to the internal domesticwaste water system, either directly orvia a tundish.

■ If the condensate pipe is routed out-side the building, use a pipe with atleast 7 30 mm and protect this pipefrom frost. Avoid long external piperuns. Install a tundish.

! Please noteA frozen condensate pipe canresult in faults and damage tothe boiler.Always protect condensatepipes against frost.

■ Observe local building regulations.Connect condensate pipe A to the pub-lic sewage system with a constant falland a pipe vent.Observe the local waste water regula-tions.

NoteFill the siphon with water before com-missioning.



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Filling the siphon with water

Pour at least 0.3 l of water into the flueoutlet.

! Please noteDuring commissioning, flue gasmay escape from the condensatedrain.Always fill the siphon with waterbefore commissioning.

Balanced flue connection

Connect the balanced flue pipe.During installation and positioning of theflue system, observe Part J of buildingregulations and BS 5440.

Flue system installation instruc-tions

Connecting several Vitodens 050-Wto a shared flue system

Adjust the burner setting of each con-nected boiler to match the flue system.See page 31.

Do not carry out commissioning untilthe following conditions are met:■ Free passage through the flue gas

pipes.■ Flue system with positive pressure is

gas-tight.

■ Apertures for ensuring sufficient com-bustion air supply are open and cannotbe closed off.

■ Applicable regulations on installingand commissioning flue systems havebeen followed.



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DangerLeaking or blocked flue systemsor an insufficient supply of com-bustion air cause life threateningpoisoning due to carbon monox-ide in the flue gas.

Ensure the flue system functionscorrectly. Apertures for combus-tion air supply must not be able tobe closed off.

Opening the programming unit

Only required if a wireless receiver ortime switch (accessories) is to be con-nected.

1.

3.

2. 2x

! Please noteElectronic assemblies can bedamaged by electrostatic dis-charge.Prior to commencing work, touchearthed objects such as heatingor water pipes, to discharge staticloads.



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B

C

4 3 2 1A

OT+OT-

A Terminals on underside of appli-ance

B Outside temperature sensorC Vitotrol 100 or on-site room temper-

ature controller with LV switchingcontact and low transition resist-anceRemove jumper when connecting.

Separate installation instruc-tions

Information on connectingaccessoriesWhen connecting accessoriesobserve the separate installationinstructions provided with them.


Electrical connections56

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Outside temperature sensor (accessories)

1. Fit outside temperature sensor.

Installation site:■ North or north-westerly wall, 2 to

2.5 m above ground level; in multistorey buildings, in the upper half ofthe 2nd floor

■ Not above windows, doors or vents■ Not immediately below balconies

or gutters■ Never render over■ Connection:

2-core lead, length up to 35 m witha cross-section of 1.5 mm2

2. Connect the outside temperaturesensor across terminals 3 and 4(underside of appliance).

Power supply

Connect the power cable to the buildingmains.

Regulations and Directives

DangerIncorrectly executed electricalinstallations can result in injuriesfrom electrical current and inappliance damage.

Connect the power supply andimplement all safety measures(e.g. RCD circuit) in accordancewith the following regulations:■ IEC 60364-4-41■ VDE regulations■ Connection requirements

specified by your local powersupply utility

Install an isolator in the power cable toprovide omnipolar separation from themains for all active conductors, corre-sponding to overvoltage category III(3 mm) for full isolation. This isolatormust be fitted in the permanent electricalinstallation, in line with the installationrequirements.Protect the power cable with an external3 A fuse to BS 1362.

DangerIncorrect core allocation canresult in serious injury and dam-age to the appliance.Take care not to interchangewires "L1" and "N".


Electrical connections (cont.)

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DangerThe absence of componentearthing can lead to serious injuryfrom electric current if an electri-cal fault occurs.

The appliance and pipeworkmust be connected to the equi-potential bonding of the building.

Routing the connecting cables

! Please noteConnecting cables will be dam-aged if they touch hot compo-nents. When routing and securingcables/leads on site, ensure thatthe maximum permissible tem-perature for these cables/leads isnot exceeded.


Electrical connections (cont.)

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For further information regarding the individual steps, see the page indicated

Commissioning steps

Inspection steps

Maintenance steps Page

• • • 1. Filling the heating system.............................................. 25

• • • 2. Converting to operation with LPG................................ 27

• • • 3. Checking the static and supply pressure..................... 27

• 4. Reducing the max. heating output................................ 29

• 5. Matching the burner output to the flue system........... 30

• 6. Burner adjustment when connecting multiple flues toa flue system................................................................... 31

• 7. Checking the CO2 content............................................. 35

• • 8. Burner removal .............................................................. 38

• • 9. Checking the burner gasket and burner gauzeassembly......................................................................... 38

• • 10. Checking and adjusting the electrode.......................... 40

• • 11. Cleaning the heat exchanger......................................... 41

• • 12. Checking the condensate drain and cleaning thesiphon.............................................................................. 42

• • 13. Installing the burner ...................................................... 43

• • 14. Checking the diaphragm expansion vessel andsystem pressure............................................................. 44

• • • 15. Checking all connections on the heating water sideand DHW side for leaks

• • • 16. Checking firm seating of electrical connections

• • • 17. Checking all gas equipment for tightness at operatingpressure .......................................................................... 44

• • 18. Fitting the front panel..................................................... 45

• 19. Instructing the system user........................................... 46

Commissioning, inspection, maintenance

Steps - commissioning, inspection and maintenance

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Filling the heating system

! Please noteUnsuitable fill water increasesthe level of deposits and corro-sion and may lead to boiler dam-age.■ Flush the heating system thor-

oughly before filling.■ Only fill with water of potable

quality.

■ Fill water with a hardnessabove 300 ppm must be soft-ened.

■ Antifreeze suitable for heatingsystems can be added to the fillwater.

1. Close the gas shut-off valve.

2. Switch ON the power supply and ON/OFF switch A.

3. Activate the filling function.1. Press MODE and simultane-

ously and hold for approx. 3 s."SERV" is displayed and "0"flashes.

2. Use / to set "I"3. OK to confirm.

The filling function is enabled.

NoteThis function terminates automati-cally after 30 min or when the ON/OFF switch is switched off.


Further details regarding the individual steps56

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B C

A 4. Open shut-off valves B and C.


Further details regarding the individual steps (cont.)

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5. Fill and vent the heating system usingthe on-site valve. System pressure0.8 to 1.2 bar (0.08 to 0.1 MPa). The system can be filled using a sep-arate filling point fitted at a convenientposition on the heating circuit. Theconnection must be removed whenfilling is complete. Where local WaterAuthority regulations do not allowtemporary connection, a sealed sys-tem filler pump with break tank mustbe used. The heating system will notbe filled automatically from thedomestic hot water side. Alternativemethods for filling sealed systems aregiven in BS 5449.

Converting to operation with LPG

In the delivered condition, the boiler isset up for operation with natural gas. Foroperation with LPG, change the gas noz-zle and switch to the correct gas type inthe control unit.

Separate installation instructions

Conversion from LPG to natural gas, seepage 63.

Checking the static and supply pressure

DangerCO formation as a result of incor-rect burner adjustment can haveserious health implications.Carry out a CO test before andafter work on gas appliances.

Operation with LPGPurge the LPG tank twice during com-missioning or replacement. Vent the tankand gas connection line thoroughly afterpurging.



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A

Gas train viewed from behind

1. Close the gas shut-off valve.

2. Undo screw A inside test connector"IN" on the gas train, but do notremove it. Connect the pressuregauge.

3. Open the gas shut-off valve.

4. Check the static pressure.Set value: max. 57.5 mbar(5.75 kPa)

5. Start the boiler.

NoteDuring commissioning, the boiler canenter a fault state because of airlocksin the gas line. After approx. 5 s,press Reset to reset the burner (seepage 51).



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6. Check the supply (flow) pressure.

Set value:■ Natural gas: 20 mbar (2.0 kPa)■ LPG: 37 mbar (3.7 kPa)

NoteUse a suitable measuring instrumentwith a resolution of at least 0.1 mbar(0.01 kPa) to check the supply pres-sure.

7. Proceed as indicated in the followingtable.

8. Shut down the boiler, close the gasshut-off valve, remove the pressuregauge and tighten screw in test con-nector A.

9. Open the gas shut-off valve and startthe appliance.

DangerGas escaping from the testconnector leads to a risk ofexplosion.Check gas tightness at testconnector A.

Supply pressure (flow pressure) ProcedureFor natural gas For LPGbelow 17.4 mbar(1.74 kPa)

below 25 mbar(2.5 kPa)

Do not commission the boiler. Notify yourgas supply utility or LPG supplier.

17.4 to 25 mbar(1.74 to 2.5 kPa)

25 to 47 mbar(2.5 to 4.7 kPa)

Start the boiler.

above 25 mbar(2.5 kPa)

above 47 mbar(4.7 kPa)

Install a separate gas pressure governorupstream of the system and regulate theflow pressure to 20 mbar (2.0 kPa) fornatural gas or 37 mbar (3.7 kPa) for LPG.Notify your gas supply utility or LPG sup-plier.

Reducing the max. heating output

The maximum heating output can bereduced in 25 % increments according tosystem requirements.

1. Press MODE and simultaneouslyfor 3 s."SERV" is displayed and "I"flashes.

2. Use / to select "2" and confirm withOK."00" flashes on the display (corre-sponds to 100 % burner output).

3. Use / to select the required burneroutput and confirm with OK.



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4. Press MODE and simultaneouslyfor 3 s.Service mode is terminated. Servicemode also terminates automaticallyafter 30 min.

5. Start the boiler.

6. Check the selected burner output bymeasuring the gas throughput at ahigh heating output.

Matching the burner output to the flue system

To match the burner output to the sys-tem's flue pipe length, a correction factorcan be set.

NoteObserve max. flue pipe lengths in thepricelist. If the max. flue pipe lengths inthe pricelist are exceeded, a calculatedperformance verification is required.


2. Use / to select "3" and confirm withOK."0" flashes on the display.

3. Look up the required correction factorrelevant to the length of the flue in thetables below.

4. Use / to set the required correctionfactor and confirm with OK.


Open flue operation 7 60 mmCorrection fac-tor

0 1 2 3 4 5 6

Rated heatingoutput (kW)

Flue length (m)

24 ≤ 8 > 8 ≤15

Do not adjust

33 ≤ 8 > 8 ≤14

> 14 ≤19

> 19 ≤25

Do not adjust



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Room sealed operation 7 60 mm coaxialCorrection fac-tor

0 1 2 3 4 5 6

Rated heatingoutput (kW)

Flue length (m)

24 ≤ 4 > 4 ≤ 8 > 8 ≤12

> 12 ≤15

Do not adjust

33 ≤ 4 > 4 ≤ 7 > 7 ≤11

> 11 ≤20

Do not adjust

Burner adjustment when connecting multiple flues to a flue sys-tem

When connecting several Vitodens 050-W to a shared flue system:

Adjust the burner setting of each con-nected boiler by a correction factor tomatch the flue system.

System conditions:■ Shared flue in shaft 7 100 mm■ Balanced flue connection pipe from

boiler to shaft 7 80/125 mm■ Minimum shaft cross-section

– Square 175 x 175 mm– Round 7 195 mm

■ Height between floors min. 2.5 m■ Max. 4 boilers with the same rated

heating output connected to the fluesystem



3. Look up the required correction factorrelevant to the flue system require-ments in the tables below.

4. Use / to set the required correctionfactor and confirm with OK.




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One boiler per floor

Rated heating output 24 kWNumber of boilers 2 3 4Correction factor (setting value) Flue length a (m)01 ≤ 212 > 21 ≤ 25 ≤ 19 ≤ 133 – > 19 ≤ 25 > 13 ≤ 174 – – > 17 ≤ 215 – – –6 – – –

Rated heating output 33 kWNumber of boilers 2 3 4Correction factor (setting value) Flue length a (m)01 ≤ 122 > 12 ≤ 25 ≤ 173 – ≤ 164 – > 16 ≤ 20 ≤ 145 – > 20 ≤ 25 > 14 ≤ 166 – – > 16 ≤ 18

NoteThe correction factor changes the mod-ulating range of the boiler.



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3 m

a

2.5

m



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Two boilers per floor

Rated heating output 24 kWNumber of boilers 2 4Correction factor (setting value) Flue length a (m)01 ≤15 ≤52 – > 5 ≤ 93 – > 9 ≤ 144 – > 14 ≤ 155 – –6 – –

Rated heating output 33 kWNumber of boilers 2 4Correction factor (setting value) Flue length a (m)01 ≤ 92 > 9 ≤ 15 ≤ 63 – > 6 ≤ 84 – > 8 ≤ 105 – > 10 ≤ 136 – > 13 ≤ 15

NoteThe correction factor changes the mod-ulating range of the boiler.



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3 m

0.3

m2.

2 m

a

Checking the CO2 content

The Vitodens 050-W is factory-set fornatural gas. During commissioning ormaintenance, the CO2 and CO have tobe measured at the boiler flue adaptortest port to check the flue integrity. Sub-ject to the Wobbe index, the CO2 contentfluctuates between 7.5 % and 10.5 %. ACO level of up to 500 ppm during start-up is acceptable.

We recommend measuring O2 as thevalue is unmistakable regarding lambda(air/gas). The O2 content fluctuatesbetween 7.5 % and 2.2 %. The CO/CO2

ratio has to be less than 0.004.If the actual CO2 or O2 and CO valuesdeviate from the stated range, check thebalanced flue systems for leaks. If flueinstallation is OK, change the gasvalve.



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NoteOperate the appliance with uncontami-nated combustion air to prevent operat-ing faults and damage.

A

1. Connect a flue gas analyser at fluegas port A on the boiler flue con-nection.

2. Start the boiler and check for leaks.

DangerEscaping gas leads to a risk ofexplosion.Check all gas equipment fortightness.

3. To check the CO2 content the burneroutput can be set manually.1. Press MODE.2. / until "SERV" is displayed.3. OK to confirm.

"OFF" appears on the display.4. Use / to select the burner output:

Value shown Display

Burner out-put

_ 20 20 %_ _ 40 40 %_ _ _ 60 60 %_ _ _ _ 80 80 %_ _ _ _ _ 00 100 %

5. Confirm your settings with OK.

NoteThis function terminates automati-cally after 30 min, alternatively use / to set the burner output to

"OFF" after checking.



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4. Set the higher heating output andcheck the CO2 content.Subject to gas type, the CO2 contentmust be within the following range.See table.

Gas type CO2 contentin %

E or H (G20) 7.5 – 10.5P (G31) 10.0 – 12.0

5. Set the lower heating output andcheck the CO2 content.The CO2 content must be between0.3 and 0.9 % below the value for theupper heating output.

6. ■ If the CO2 content is within thegiven range, continue with point 8.

■ If the CO2 content lies outside thegiven range, check the flue gas/ventilation air system for tightness;remedy any leaks.Replace gas train if required.

7. Re-check the CO2 content for theupper and lower heating output.

8. Shut down the boiler, remove the fluegas analyser and close flue gas testport A.



5675

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Burner removal

4xG

C

E

F

ABD

1. Switch ON/OFF switch to OFF.

2. Shut off the gas supply.

3. Pull the power cables from fan motorA, gas train B, ignition unit C andelectrodes D.

4. Pull venturi extension E from thefan.

5. Undo the fitting from gas supply pipeF.

6. Undo 4 screws G and remove theburner.

! Please notePrevent damage. Never rest the burner on theburner gauze assembly.

Checking the burner gasket and burner gauze assembly

Check burner gasket A for damage andreplace if required.

Replace the burner gauze assembly if itis damaged.



5675

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39

A

C

D

E

B

1. Remove electrode B.

2. Undo the 2 Torx screws and removethermal insulation ring C.

3. Undo the 2 Torx screws and removeburner gauze assembly D with gas-ket E.

4. Insert and secure new burner gauzeassembly D with new gasket E.

! Please noteTighten screws just enough to ensure the components donot suffer damage and willfunction correctly.



5675

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5. Mount thermal insulation ring C.


6. Fit electrode B.


Checking and adjusting the electrode8+

2

4+0,5

1. Check the electrode for wear andcontamination.

2. Clean the electrode with a smallbrush (not with a wire brush) or emerypaper.

3. Check the electrode gaps. If the gapsare not as specified or the electrodeis damaged, replace electrode andgasket and realign the electrode.Tighten the fixing screws for the elec-trode.




5675

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41

Cleaning the heat exchanger

! Please noteDo not damage the surfaces ofthe heat exchanger that comeinto contact with hot gas. This canlead to corrosion damage. Never use brushes to clean theheat exchanger.Brushing can cause deposits tobecome lodged in the gapsbetween the coils.

NoteDiscolouration on the heat exchangersurface is a normal sign of use. It has nobearing on the function and service lifeof the heat exchanger.The use of chemical cleaning agents isnot required.

A

1. Use a vacuum cleaner to removecombustion residues from heatingsurface A of the heat exchanger.

2. Flush heating surface A withwater.

3. Check condensate drain and cleansiphon. See the following chapter.

4. Flush the heating surface again withwater (the siphon is also filled withwater in the process).



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Checking the condensate drain and cleaning the siphon

AC

B

1. Unclip burner control unit A andremove. Protect against escapingcondensate.

2. Pull siphon B upwards out of thedrain connection.

3. Remove supply hose C from siphonB.

4. Clean siphon B.

5. Refit supply hose C.

6. Refit siphon B to the drain connec-tion.

7. Install burner control unit A. Checkplugs for correct seating.

8. Fill siphon B with water. For this,pour approx. 0.3 l of water into thecombustion chamber.

9. Check that condensate can drainfreely and that the connections aretight.



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43

Installing the burner

4xA

F

C

B

DEG

1. Fit burner and tighten 4 screws Adiagonally.


2. Insert new gasket and tighten the fit-ting on gas supply pipe B.

3. Plug venturi extension C into thefan.

4. Install the power cables of fan motorD, gas train E, ignition unit F andelectrodes G.

5. Reopen gas supply and switch onpower supply.



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6. Check the gas connections forleaks.

DangerEscaping gas leads to a risk ofexplosion.Check the fitting for gas tight-ness.

! Please noteThe use of leak detectionspray can result in faulty oper-ation. Leak detection spray must notcome into contact with electri-cal contacts or seal the dia-phragm opening on the gasvalve.

Checking the diaphragm expansion vessel and system pressure

NoteThe expansion vessel can lose some ofits charge pressure after some time inuse. When the boiler heats up, the pres-sure gauge will indicate a higher pres-sure of 2 or 3 bar (0.2 or 0.3 MPa). Thesafety valve can respond and dischargeexcess pressure.For this reason, check the expansionvessel pre-charge pressure annually.

Check whether the installed expansionvessel is adequate for the system watervolume (GB only).Carry out this test on a cold system.

1. Drain the system until the pressuregauge shows "0".Alternatively, close the cap valve onthe expansion vessel and reduce thepressure until the pressure gaugeindicates "0".

2. If the pre-charge pressure of theexpansion vessel is lower than thestatic system pressure, top up withnitrogen until the pre-charge pres-sure is 0.1 to 0.2 bar (10 to 20 kPa)higher than the static system pres-sure.

3. Top up with water until the chargepressure of the cooled system is atleast 1.0 bar (0.1 MPa), and is 0.1 to0.2 bar (10 to 20 kPa) higher than thepre-charge pressure of the expan-sion vessel. Permiss. operating pressure: 3 bar(0.3 MPa)

Checking all gas equipment for tightness at operating pressure

DangerEscaping gas leads to a risk ofexplosion.Check all gas equipment for tight-ness.

! Please noteThe use of leak detection spraycan result in faulty operation.



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45

Leak detection spray must notcome into contact with electricalcontacts or seal the diaphragmopening on the gas valve.

Fitting the front panel

1.

2x

2.

1. Hook the front panel into place. 2. Tighten screws on the underside.



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Instructing the system user

The system installer should hand theoperating instructions to the system userand instruct the user in operating thesystem.



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47

Display Measures Control unit issues

a heat demand No Increase set value

and ensure heat isdrawn off

Yes

Fan starts No After approx. 1 minfault F9

Check the fan, fanconnecting cables,power at the fanand fan control

Yes

Ignition No Fault F4 Check the ignitionmodule connec-tion

Yes

Gas train opens No Fault F4 Check the gastrain (control volt-age 230 V) andgas supply pres-sure

Yes

Ionisation currentbuilds (higher than2 µA)Symbol A

No Fault F4 Check the ionisa-tion current andelectrode adjust-ment, check thecondensate drainand the gas line forairlocks.

Troubleshooting

Function sequence and possible faults56

75 9

91 G

B

Serv

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48

Yes

Burner in opera-tion

No Stops below the setboiler water tem-perature and re-starts immediately

Check the flue sys-tem for tightness(flue gas recircula-tion); check thegas flow pressure

Fault display

Example

Display■ Faults with lower priority:

Fault code (e.g. "51") is displayed per-manently and fault symbol " " flashes

■ Faults with higher priority:Fault code (e.g. "F2") flashes and faultsymbol " " flashes

For an explanation of the fault codes,see the following table.

Displayedfault code

System characteris-tics

Cause Measures

10 Constant mode Short circuit, out-side temperaturesensor

Check the outside tem-perature sensor and lead(see page 54).

18 Constant mode Lead break, out-side temperaturesensor

Check the outside tem-perature sensor and lead(see page 54).

30 Burner blocked Short circuit, boilerwater temperaturesensor

Check boiler water tem-perature sensor (seepage 55).

38 Burner blocked Lead break, boilerwater temperaturesensor

Check boiler water tem-perature sensor (seepage 55).

51 No DHW heating Short circuit, outlettemperature sen-sor

Check sensor (seepage 57).

Troubleshooting

Function sequence and possible faults (cont.)

5675

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49

Displayedfault code


Cause Measures

52 Burner blocked Short circuit, flowsensor

Check connections andlead; replace sensor if re-quired.

59 No DHW heating Lead break, outlettemperature sen-sor


5A Burner blocked Lead break, flowsensor

Check connections andlead; replace sensor if re-quired.

A9 Control mode withoutOpenTherm influ-ence

Communication er-ror, OpenThermdevice

Check connections andlead; replace OpenThermif required.

b0 Burner blocked Short circuit, fluegas temperaturesensor


b8 Burner blocked Lead break, fluegas temperaturesensor


E3 Burner in a faultstate

Fault in safetychain

Check the temperaturelimiter and connecting ca-bles (see page 56).

E5 Burner blocked Internal fault Check the ionisation elec-trode and connecting ca-bles.

F0 Burner blocked Internal fault Replace control unit.F1 Burner in a fault

stateMax. flue gas tem-perature exceeded

Check heating system filllevel. Check circulationpump. Vent the system.

F2 Burner in a faultstate

Temperature limit-er has responded

Check heating system filllevel. Check circulationpump. Vent the system.Check the temperaturelimiter and connecting ca-bles (see page 56). Press "Reset" (seepage 51).

Troubleshooting

Fault display (cont.)

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50

Displayedfault code


Cause Measures


Flame signal is al-ready present atburner start

Check ionisation elec-trode and connecting ca-ble. Press "Reset" (seepage 51).


No flame signal de-tected

Check the ignition/ionisa-tion electrode and con-necting cables, check thegas pressure, check thegas train, ignition, ignitionmodule and condensatedrain.Press "Reset" (seepage 51).


Fuel valve closestoo late

Check gas train. Checkboth control paths.Press "Reset" (seepage 51).


Fan speed too lowduring burner start

Check fan, fan connectingcables and power supply;check fan control.Press "Reset" (seepage 51).

FA Burner in a faultstate

Fan idle state notreached

Check fan, fan connectingcables and power supply;check fan control.Press "Reset" (seepage 51).

FC Burner blocked Electrical fan con-trol (control unit)faulty

Check fan connecting ca-ble; replace if required, orreplace control unit.

Troubleshooting


5675

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51

Displayedfault code


Cause Measures

Fd Burner blocked Fault, burner con-trol unit

Check ignition electrodesand connecting cables.Check whether a stronginterference (EMC) fieldexists near the appliance.

Press "Reset" (seepage 51).Replace control unit iffault persists.

FF Burner blocked Fault, burner con-trol unit

Check ignition electrodesand connecting cables.Check whether a stronginterference (EMC) fieldexists near the appliance.

Press "Reset" (seepage 51).Replace control unit iffault persists.

––– Burner blocked Communication er-ror between burnercontrol unit andprogramming unit

Check connecting cable.Press "Reset" (seepage 51).Replace burner controlunit or programming unit ifthe fault persists.

Reset (reset burner control unit)

Press À and ¿ simultaneously.––– is displayed."¨" extinguishes and the default displayis shown if the fault has been removed.Alternatively further faults will be dis-played.

Scanning the programming unit soft-ware version

Press À and simultaneously.

Troubleshooting


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! Please noteResidual water will escape whenthe boiler or one of the followingcomponents is fitted orremoved:■ Water-filled pipework■ Circulation pumps■ Plate heat exchanger■ Components fitted in the heat-

ing water or DHW circuit

Water ingress can result in dam-age to other components.

Protect the following componentsagainst ingress of water:■ Control unit (in particular in the

service position)■ Electrical components■ Plug-in connections■ Cables and leads

Troubleshooting

(cont.)

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53

Removing the front panel

2x

1.

2.

1. Undo screws at the bottom of theboiler; do not remove completely.

2. Remove the front panel.

Troubleshooting

Repairs56

75 9

91 G

B

Serv

ice

54

Outside temperature sensor

4 3 2 1

OT+OT-

A

1. Disconnect leads from outside tem-perature sensor A.

100

10

-20 -10 0 10 20 30Temperature in °C

68

20

406080

200

Res

ista

nce

in k

Ω

Sensor type: NTC 10 kΩ

2. Check the sensor resistance andcompare it with the curve.

3. In the event of severe deviationreplace the sensor.

Troubleshooting

Repairs (cont.)

5675

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55

Boiler water temperature sensor

A

1. Pull the leads from boiler water tem-perature sensor A and check theresistance.

10

1

10 30 50 70 90 110Temperature in °C

0.40.60.8

2

468

20

Res

ista

nce

in k

Ω



Troubleshooting

Repairs (cont.)

5675

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Serv

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56

3. In the case of severe deviation, drainthe boiler on the heating water sideand replace the sensor.

DangerThe boiler water temperaturesensor is in direct contact withthe heating water (risk ofscalding).Drain the boiler before replac-ing the sensor.

Checking the temperature limiter

A

If the burner control unit cannot be resetafter a fault shutdown although the boilerwater temperature is below approx.95 °C, check the temperature limiter.

1. Pull the leads from temperature lim-iter A.

2. Check the continuity of the tempera-ture limiter with a multimeter.

3. Remove the faulty temperature lim-iter.

4. Install a new temperature limiter.

5. Reset by pressing "Reset" on thecontrol unit to (see page 51).

Troubleshooting

Repairs (cont.)

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57

Checking the outlet temperature sensor

A

1. Pull leads from outlet temperaturesensor A.


10

1


0.40.60.8

2

468

20

Res

ista

nce

in k

Ω



NoteWater may leak out when replacingthe outlet temperature sensor. Shutoff the cold water supply. Drain theDHW line and the plate heatexchanger (on the DHW side).

Troubleshooting

Repairs (cont.)

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58

Check flue gas temperature sensor

A

1. Pull leads from flue gas temperaturesensor A.


10

1


0.40.60.8

2

468

20

Res

ista

nce

in k

Ω



Troubleshooting

Repairs (cont.)

5675

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59

Replacing the flow limiter

B

C

A

1. Drain the boiler on the DHW side.

2. Pull off spring clip A.

3. Remove flow sensor B.

4. Remove faulty flow limiter C.

5. Check fitted strainer for dirt/contami-nation. Clean strainer if required.

6. Select a new flow limiter C from thefollowing table.

Serial no.(type plate)

Flowratel/min

Colour

7537906 10 lightblue

7537947 14 lightpink

7. Insert new flow limiter C.

8. Mount flow sensor B with new gas-kets.

Troubleshooting

Repairs (cont.)

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Replacing the flow sensor

C

E

B

A

D 01. Drain the boiler on the DHW side.

02. Pull the leads off faulty flow sensorA.

03. Pull off spring clip B.

04. Remove enclosure C with flowsensor A.

05. Pull off spring clip D and removefaulty flow sensor A.

06. Select new flow limiter E from thetable on page 59.

07. Insert new flow limiter E.

08. Fit new flow sensor A with newgaskets in enclosure C. Insertspring clip D.

09. Insert spring clip B.

10. Attach leads.

Troubleshooting

Repairs (cont.)

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61

Checking or replacing the plate heat exchanger

C D

EF

A

B

C Heating water returnD Heating water flow

E DHWF Cold water

1. Shut off and drain the boiler on theheating water and the DHW side.

2. Undo screw A on the plate heatexchanger and remove plate heatexchanger B with gaskets.

NoteDuring and after removal, smallamounts of water may trickle from theplate heat exchanger.

Troubleshooting

Repairs (cont.)

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3. Check the connections on the DHWside for scaling; clean or replace theplate heat exchanger if required.

4. Check the connections on the heat-ing water side for contamination;clean or replace the plate heatexchanger if required.

5. Install in reverse order using newgaskets.

NoteDuring installation, ensure the fixingholes are aligned and the gaskets areseated correctly. Mount the plateheat exchanger with the correct ori-entation.

Checking the fuse

F4

1. Switch off the power supply.

2. Open the control unit enclosure.

3. Check fuse F4.

Troubleshooting

Repairs (cont.)

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63

Removing the gas restrictor

C

B

D

AF

E

1. Pull cable from gas train A.

2. Undo union nut B and remove gasgasket.

3. Undo 2 screws C and remove gastrain A.

4. Remove gasket D from gas trainA.

5. Remove gas restrictor E from gas-ket D.

6. Insert gasket D in gas train A.

7. Mount gas train A with new gas gas-ket F.


8. Remove or void gas type sticker onthe top of the boiler (next to the typeplate).

Gas type conversion

Converting from LPG to natural gas56

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9. Start the boiler and check for leaks.

DangerEscaping gas leads to a risk ofexplosion.Check all gas equipment fortightness.

! Please noteThe use of leak detectionspray can result in faulty oper-ation. Leak detection spray must notcome into contact with electri-cal contacts or seal the dia-phragm opening on the gasvalve.

Changing the gas type at the control unit

1. Switch ON the ON/OFF switch.



4. Use / to select "0" and confirm withOK.The burner has been switched tooperation with natural gas.


6. Switch the ON/OFF switch OFF andON again.The selected gas type is now ena-bled.

Checking the CO2 content

See page 35.

Gas type conversion

Converting from LPG to natural gas (cont.)

5675

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65

If an outside temperature sensor is con-nected to the control unit, the boilerwater temperature is regulated subject tothe outside temperature.In line with the selected heating curve, aboiler water temperature is set for thecurrent outside temperature.

The heating curve is set at the controlunit as a code. In the delivered condition,the heating curve with code 20 is set.

Operating instructions

Heating curve for weather-compensated operation

20

30

40

50

60

70

80

90

Boile

r wat

er te

mpe

ratu

re in

°C

20 15 10 5 0 -5 -10 -15

5

wP

qT

qP

eT wTeP

Outside temperature in °C

X Code for selected heating curveThe setting can be made in incre-ments of 5 - 35.

Control unit

Functions and operating conditions in weather-compensated mode

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Frost protection function

The frost protection function requires anoutside temperature sensor to be con-nected. The frost protection functionbecomes active at outside temperaturesof < 5 °C. The burner starts and the boilerwater temperature is held at 20 °C.

Control unit

Functions and operating conditions in… (cont.)

5675

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Overview

A

A Power supplyA1 Main PCB in control unit enclosure

on side panel

A3 Programming unitS1 ON/OFF switchX ... Electrical interface

Designs

Connection and wiring diagrams56

75 9

91 G

B

Serv

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68

Programming unit

A

D

C

B

E

F

A Power supply

Designs

Connection and wiring diagrams (cont.)

5675

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69

B Gas pressure switch (accesso-ries)

C Outside temperature sensor(accessories)

D Room temperature controller(accessories)

E Time switch or wireless receiver(accessories)

F Jumper, remove when connectingroom temperature controller

A1 Main PCBA3 Programming unitS1 ON/OFF switchX ... Electrical interface

Designs


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Control unit

A Programming unit connection B Flow sensor

Designs


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71

C Diverter valve stepper motorD Ionisation electrodeA1 Main PCBA2 Power supply unitA3 Programming unitPWM Circulation pump switchingX ... Electrical interface§ Boiler water temperature sensor$ Outlet temperature sensor

aG Flue gas temperature sensorsÖ Circulation pump 230 V~dG Gas solenoid valvefÖ Power supplyfJ Temperature limitergF Ignitiona-Ö Fan motor 230 V~a-ÖA Fan control

Designs


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The following information is required:■ Serial no. (see type plate A)■ Assembly (from this parts list)■ Position number of the individual part

within the assembly (from this partslist)

Standard parts are available from yourlocal supplier.

Parts lists

Ordering parts

5675

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73

A

B C

D E

F

A Type plateB Casing assemblyC Heat cell assembly

D Hydraulic assemblyE Control unit assemblyF Miscellaneous assembly

Parts lists

Overview of assemblies56

75 9

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B

Serv

ice

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Pos. Part0001 Front panel0002 Profiled seal0003 Viessmann logo0004 Wall mounting bracket

00020003

0003

0001

0002

0004

Parts lists

Casing assembly

5675

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75

Pos. Part0001 Gasket DN 600002 Boiler flue connection0003 Boiler flue connection plug0004 Flue gasket0005 Flue gas temperature sensor0006 Heat exchanger0007 Condensate hose0008 Splash siphon0009 Tee connector 7 190010 Gas connection0011 Gasket A 17 x 24 x 2 (5 pce)0012 Burner0013 Thermal insulation block0014 Heat exchanger mounting (set)0015 O-ring 20.63 x 2.62 (5 pce)0016 Corrugated hose 19 x 155 with ferrule/bend0017 Corrugated hose 19 x 500 with ferrule0018 Ignition transformer

Parts lists

Heat cell assembly56

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91 G

B

Serv

ice

76

0008

0007

0018

0004001300140015

0006

00010003

0011

0017

0016

0009

0013

0012

0010

0011

0015

0004

00030014

0014

0014

0002

00010005

Parts lists

Heat cell assembly (cont.)

5675

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77

Pos. Part0001 Burner gasket 7 1870002 Thermal insulation ring0003 Cylinder burner gauze assembly0004 Burner gauze assembly gasket0005 Burner door0006 Gasket, ionisation electrode (5 pce)0007 Ignition/ionisation electrode0008 Burner door flange gasket0009 Radial fan NRG 1180010 Gas valve GB-ND 055 E010011 Venturi extension0012 Gasket set G20/G310013 Conversion kit G20/G31

Parts lists

Burner assembly56

75 9

91 G

B

Serv

ice

78

0004

0003 0002 00010004

0006

0001000400060008

00080012

0012

0012

0010

0013 0011

0011

0009

0008

0007 0006 0005

0012

Parts lists

Burner assembly (cont.)

5675

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79

Pos. Part0001 Diaphragm expansion vessel CRI 80002 Diaphragm expansion vessel padding profile0003 Gasket A 10 x 15 x 1.5 (5 pce)0004 DEV connection line G 3/80005 Connection elbow HR brass0006 Profile hose HR 0007 Spring clip DN 25 (5 pce)0008 Clip 7 10 (5 pce)0009 Clip 7 80010 O-ring 20.63 x 2.62 (5 pce)0011 Temperature sensor0012 Circular seal washer 8 x 2 (5 pce)0013 Profile hose HF0014 Pressure gauge0015 Thermal circuit breaker0016 Connection elbow HF0017 Grundfos hydraulics0018 Spring clip DN 30

Parts lists

Hydraulic assembly56

75 9

91 G

B

Serv

ice

80

0002

0001

0003

0004

0011

0018

0017

0014

0008

0018

0006

0007

0005

0010

0009

0015

0012

00100009

0007

00070018

00070018

0008

0003

0009

0016000700090010

0013

000300090012

00070010

Parts lists

Hydraulic assembly (cont.)

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81

Pos. Part0001 Flow casing EU10002 Temperature sensor0003 Expansion tank0004 O-ring 19.8 x 3.6 (5 pce)0005 O-ring 16 x 3 (5 pce)0006 Clip 7 8 narrow (5 pce)0008 Plate heat exchanger0009 Circulation pump motor0010 Return casing0011 Flow limiter0012 Stepper motor0015 Air vent valve0018 Flow sensor0019 Clip 7 80020 Clip 7 160022 Connection elbow0023 Air box floor0025 Dummy adaptor, time switch0028 Gasket set, plate heat exchanger0030 Tee connector 7 19

Parts lists

Grundfos hydraulic assembly56

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91 G

B

Serv

ice

82

0030

0003

0019

0002 0006

0001

0010

00100005

0008

0028

0018

0011

00040005

0015

00150020 0012

0022

00220022

0022

00040010

0023

0025

0009

0028

00100010

000400050009001100120015001800200028

0011

0028

0006

0019

0010

00100010

00020003000400050006

Parts lists

Grundfos hydraulic assembly (cont.)

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83

Pos. Part0001 Programming unit0002 Burner control unit0003 Cable harness X1/X17/stepper motor0004 Cable harness 100/35/54/ion0005 Cable harness, connecting cable X21/GFA/programming unit0006 Outside temperature sensor lead0007 Connecting cable, heating circuit pump 200008 PWM BUS cable0009 Power cable0010 Fuse 2.5 A (slow) 250 V

Parts lists

Control unit assembly56

75 9

91 G

B

Serv

ice

84

0001

0010

0002

0009000800070006

000500040003

Parts lists

Control unit assembly (cont.)

5675

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85

Pos. Part0001 Touch-up spray paint, Vitowhite, 150 ml can0002 Touch-up paint stick, Vitowhite0003 Special grease0004 Operating instructions0005 Installation and service instructions

0004

0005

0003

0002

0001

Parts lists

Miscellaneous assembly56

75 9

91 G

B

Serv

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Rated voltage: 230 V~Rated frequency: 50 HzRated current: 2.0 A~Safety category: IIP rating: IP X4D to EN 60529

Permissible ambient temperature ■ During operation: -5 to +40 °C■ During storage

and transport: -35 to +65 °C

Temperature limitersetting: 100 °C (fixed)Backup fuse (powersupply): 3 A

Gas boiler, category II 2H3P

Rated heating output range in heating mode TF/TR 50/30 °C kW 6.5 – 24 8.8 – 33TF/TR 80/60 °C kW 5.9 – 21.9 8.0 – 30.1Rated heating output rangefor DHW heating kW 5.9 – 29 8.0 – 35

Rated heating input range kW 6.1 – 22.4 8.2 – 30.9Connection values *1Relative to the max. load with:

- Natural gas H m3/h 2.37 3.28- LPG P kg/h 1.71 2.36Power consumption (max.) W 118 142DHW heating Permiss. operating pressure bar 10 10 MPa 1.0 1.0Min. operating pressure, cold water bar 1 1 MPa 0.1 0.1Nominal water flow rateat ΔT 30 K (to EN 13203)

l/min 13.8 16.7

Set flow rate (max.) l/min 10 14Min. flow rate l/min 2.1 2.1Product ID CE-0085CP0029

*1 The connection values are only for reference (e.g. in the gas contract application)or for a supplementary, rough estimate to check the volumetric settings. Due tofactory settings, the gas pressure must not be altered from these values. Refer-ence: 15 °C, 1013 mbar (101.3 kPa).

Specification

Specification

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Declaration of Conformity for the Vitodens 050-W

We, Viessmann Werke GmbH & Co KG, D-35107 Allendorf, confirm as sole respon-sible body that the product Vitodens 050-W complies with the following standards:

EN 297 EN 55 014-2EN 483 EN 60 335-1EN 625 EN 60 335-2-102EN 677 EN 61 000-3-2EN 806 EN 61 000-3-3EN 12 897 EN 62 233EN 55 014-1

In accordance with the following Directives, this product is designated _-0085:

92/42/EEC 2006/95/EC2004/108/EC 2009/142/EC

This product complies with the requirements of the Efficiency Directive (92/42/EEC) for condensing boilers.

Allendorf, 01 February 2015 Viessmann Werke GmbH & Co KG

Authorised signatory Manfred Sommer

Certificates

Declaration of conformity56

75 9

91 G

B

Serv

ice

88

BBoiler water temperature sensor .......55Burner gasket.....................................38Burner gauze assembly.....................38Burner installation..............................43Burner removal..................................38

CCombustion chamber cleaning..........41Commissioning..................................25Condensate........................................18Condensate drain.........................18, 42Connection diagram...........................67– Control unit.....................................70– Programming unit...........................68Connections.......................................16

DDeclaration of Conformity..................87

EElectrical connections........................21

FFault code..........................................48Fault display.......................................48Filling function....................................25Flow limiter.........................................59Flow sensor........................................60Flue gas temperature sensor.............58Flue pipe............................................19Frost limit...........................................66Frost protection..................................66Function sequence.............................47Fuse...................................................62

GGas connection..................................17Gas supply pressure..........................29Gas train ...........................................28Gas type conversion..........................63– LPG................................................27– Natural gas.....................................63

HHeat exchanger cleaning...................41Heating curve.....................................65Heating output reduction....................29

IIgnition...............................................40Ignition electrode................................40Ionisation electrode............................40

MMax. heating output...........................29Multiple flue system connection.........31

OOutlet temperature sensor.................57Output adjustment– Multiple connection.........................31Output matching to flue system.........30Outside temperature sensor........22, 54

PPlate heat exchanger.........................61Power supply.....................................22Programming unit opening.................20

RReset..................................................51

SSafety chain ......................................56Safety valve.......................................18Siphon..........................................19, 42Software version................................51Specification ......................................86Static pressure...................................28Supply pressure.................................27System filling................................25, 27System pressure................................27

TTemperature limiter............................56Troubleshooting.................................53

Keyword index

Keyword index

5675

991

GB

89

VVentilation air pipe.............................19

WWall mounting....................................13Water side connections......................16Weather-compensated mode.............65

Keyword index

Keyword index (cont.)

5675

991

GB

90

5675

991

GB

91

5675

991

GB

92

Applicability

These service instructions relate to appliances with the following serial num-bers (see type plate):7202938 7202939

Viessmann LimitedHortonwood 30, TelfordShropshire, TF1 7YP, GBTelephone: +44 1952 675000Fax: +44 1952 675040E-mail: [email protected]

Viessmann Werke GmbH&Co KGD-35107 AllendorfTelephone: +49 6452 70-0Fax: +49 6452 70-2780www.viessmann.com

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Date post:	14-Apr-2018
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