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Operating instructionsfor the system user
VIESMANN
With constant temperature or weather-compensated control unit
VITODENS 050-W
5513 086 GB 9/2014 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 operating instructions aredesigned for heating system users.This appliance can also be operated bychildren 8 years and older, as well as byindividuals with reduced physical, sen-sory or mental faculties or those lackingin experience and knowledge, providedsuch individuals are being supervised orhave been instructed in the safe use ofthis appliance and any risks arising fromit.
! Please noteSupervise children in the proxim-ity of the appliance.■ Never permit children to play
with the appliance.■ Cleaning and maintenance
must not be carried out byunsupervised children.
Connecting the appliance
■ Connection and commissioning of theappliance may only be carried out byauthorised contractors.
■ Only operate the appliance with suita-ble fuels.
■ Adhere to the electrical connectionrequirements.
■ Modifications to the existing installa-tion may only be carried out by author-ised contractors.
DangerIncorrectly executed work on theheating system can lead to lifethreatening accidents.■ Work on gas installations must
only be carried out by a regis-tered gas fitter.
■ Work on electrical equipmentmust only be carried out by aqualified electrician.
Working on the appliance
■ When adjusting settings and carryingout work on the appliance always fol-low the guidelines in these operatinginstructions.Additional work on the appliance mayonly be carried out by authorised con-tractors.
■ Never open the appliance.■ Never remove the cladding.■ Never remove or change additional
parts or installed accessories.■ Never open or retighten pipe connec-
tions.
Safety instructions
For your safety
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DangerHot surfaces can cause burns.■ Never open the appliance.■ Never touch the hot surfaces of
uninsulated pipes, fittings orflue pipes.
If you smell gas
DangerEscaping gas can lead to explo-sions which may result in seriousinjury.■ Do not smoke. Prevent naked
flames and sparks. Do notswitch 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 and power sup-
ply utility and your local heatingcontractor 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 all doors in the living
space.
Emergency contact
If you smell gas or detect a gas leak callthe National Gas Emergency service on0800 111 999. Notify your gas or elec-tricity supplier and your heating contrac-tor.■ Shut off the electricity supply to the
building from a safe place (outside thebuilding).
In case of fire
DangerFire presents a risk of burns andexplosion.■ Shut down the heating system.■ Close the shut-off valves in the
fuel supply lines.■ Use a tested fire extinguisher,
class ABC.
What to do if the heating systemdevelops a fault
DangerFault messages indicate faults inthe heating system. If faults arenot rectified, they can have lifethreatening consequences.Do not acknowledge fault mes-sages several times in quick suc-cession. Inform your heating con-tractor so the cause can be ana-lysed and the fault rectified.
Safety instructions
For your safety (cont.)
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Installation room requirements
DangerSealed vents result in a lack ofcombustion air. This leads toincomplete combustion and theformation of life threatening car-bon monoxide.Never cover or close existingvents.Do not make any subsequentmodifications to the buildingcharacteristics that could affectsafe operation (e.g. cable/pipe-work routing, cladding or parti-tions).
DangerEasily flammable liquids andmaterials (e.g. petrol, solvents,cleaning agents, paints or paper)can cause deflagration and fire.Never store or use such materialsin the installation room or in directproximity to the heating system.
! Please noteIncorrect ambient conditions canlead to heating system damageand can put safe operation atrisk.■ Ensure ambient temperatures
are above 0 °C and below35 °C.
■ Prevent air contamination byhalogenated hydrocarbons(e.g. as contained in paints,solvents or cleaning fluids) andexcessive dust (e.g. throughgrinding/polishing work).
■ Avoid continuously high humid-ity levels (e.g. through continu-ous drying of washing).
Extractors
The operation of appliances that extractair to the outside (cooker hoods, extrac-tors, air conditioning units, etc.) can cre-ate negative pressure. If the boiler isoperated at the same time, this can leadto reverse flow 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.Take suitable steps to ensure anadequate supply of combustionair. If necessary, contact yourheating contractor.
Auxiliary components, spare andwearing parts
! Please noteComponents not tested with theheating system may damage thesystem or affect its function.Only allow qualified contractorsto carry out installation orreplacement work.
Safety instructions
For your safety (cont.)
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Introductory informationCommissioning..................................................................................................... 7Intended use......................................................................................................... 7Terminology.......................................................................................................... 7Your system is preset at the factory..................................................................... 8Energy saving tips................................................................................................ 8
Where to find the controlsSummary of controls and indicators..................................................................... 9■ Display and control elements............................................................................ 9■ Symbols on the display..................................................................................... 10■ Operation.......................................................................................................... 10Operating mode of the heating system................................................................ 10■ Operation without room temperature controller................................................ 10■ Operation with room temperature controller..................................................... 11■ Weather-compensated mode............................................................................ 11
Start-up/shutdownStarting the heating system.................................................................................. 12Shutting down the heating system....................................................................... 13Shutting down central heating and DHW heating................................................. 14■ Shutting down central heating........................................................................... 14■ Stopping DHW heating..................................................................................... 14
Adjusting the room temperatureSetting the central heating temperature............................................................... 15■ Operation without room temperature controller ― Setting the heating water
temperature....................................................................................................... 15■ Operation with room temperature controller ― Setting the boiler water tem-
perature............................................................................................................. 15■ Weather-compensated operation ― setting the room temperature.................. 16
Setting the DHW temperatureDHW temperature................................................................................................ 17
Emissions test modeStarting emissions test mode (to be used by a competent person only).............. 18■ Ending emissions test mode............................................................................. 18
What to do if...Rooms are too cold.............................................................................................. 19Rooms are too hot................................................................................................ 19There is no hot water............................................................................................ 20
Index
Index55
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The DHW is too hot.............................................................................................. 20
UpkeepCleaning............................................................................................................... 21Inspection and maintenance................................................................................ 21Boiler.................................................................................................................... 21Power cable.......................................................................................................... 21
AppendixTerminology.......................................................................................................... 22
Keyword index.................................................................................................... 23
Index
Index (cont.)
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The commissioning and matching up ofthe control unit to local conditions andthe structural characteristics of the build-ing must be carried out by your heatingcontractor.
Intended use
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).
Terminology
To provide you with a better understand-ing of the functions of your Viessmanncontrol unit, some terminology isexplained.The terms are marked as follows:
Further information can be foundin chapter "Terminology" in the ap-pendix.
Introductory information
Commissioning55
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Your heating system is preset at the fac-tory and is therefore ready for operation.DHW and central heating are enabled.Your heating contractor can make fur-ther adjustments for you during commis-sioning.You can change these settings at anytime to suit your individual require-ments.
Power failureAll settings are saved if there is a powerfailure.
Energy saving tips
Central heating
■ Room temperature:Never overheat your rooms. Everydegree of room temperature reductionsaves up to 6 % on your heating bills.If possible, set your room temperatureno higher than 20 °C (see page 15).
■ Ventilation:For venting/airing, open the windowsfully for a brief time. During this time,close the thermostatic valves (if nomechanical ventilation system isinstalled).
■ Roller shutters:Close roller shutters (where installed)at dusk.
■ Thermostatic valves:Ensure that thermostatic valves areproperly adjusted.
■ Radiators:Never cover radiators or thermostaticvalves.
DHW heating
■ DHW temperature:Never set the DHW temperature toohigh (see page 17).
■ Hot water consumption:Consider showering instead of runninga bath. A shower generally uses lessenergy than a full bath.
Introductory information
Your system is preset at the factory
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Display and control elements
You can change any settings on yourheating system centrally at the controlunit.
NoteIf your system is equipped with a roomtemperature controller, you can use it toset the room temperature (see separateoperating instructions)..All thermostatic radiator valves must befully open in the room where the roomtemperature controller is installed.
bar1
0
2 3
4
DCBA
A DisplayB Keys (see page 10)
C ON/OFF switchD Pressure gauge
Where to find the controls
Summary of controls and indicators55
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Symbols on the display
°C°F
SERV
A
B C D
E
FGH
A DHW heatingB Heating modeC Display value or fault codeD Temperature displayed in °C or °F
E Fault displayF Service modeG Current burner outputH Burner operation
Operation
A B C
A Selecting/terminating functionsB Changing or selecting values
C Accepting values/confirming selec-tion
Operating mode of the heating system
Operation without room temperature controller
Further information can be foundin chapter "Terminology" in the ap-pendix.
Setting the required heating water tem-perature, see page. 15.
Where to find the controls
Summary of controls and indicators (cont.)
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Operation with room temperature controller
Further information can be foundin chapter "Terminology" in the ap-pendix.
Make any settings on the connectedroom temperature controller using therelevant operating instructions.
NoteSet the boiler water temperature set highenough in order to achieve the requiredroom temperature.
For settings, see page 15.
Weather-compensated mode
Further information can be foundin chapter "Terminology" in the ap-pendix.
The boiler water temperature is regula-ted in accordance with a defaulted heat-ing curve and the prevailing outside tem-perature.For setting the room temperature, seepage 16.
NoteConnect a room temperature controllerto your heating system to prevent gen-erating heat unnecessarily at times whenyou do not require central heating. Thisenables central heating to be suspendedat night, for example, in order to saveenergy.
Where to find the controls
Operating mode of the heating system (cont.)
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We recommend you contact your heat-ing contractor if you are planning to takeyour heating system out of use for longperiods.
bar1
0
2 3
4
AB C
1. Check the heating system pressureat pressure gauge A:The system pressure is too low if theindicator points to the area below0.8 bar(80 kPa). In this case, top upwith water or notify your local heatingcontractor. When topping up the sys-tem with water the pressure (cold)should not exceed 1.5 bar.
2. Open gas shut-off valve C.
3. Switch ON the power supply, e.g. ata separate MCB/fuse or a mains iso-lator.
4. Switch ON/OFF switch B ON.The control unit carries out a self testafter being switched ON.Your heating system and room tem-perature controller (if installed) arenow ready for operation.
°C
NoteBoiler frost protection is enabled.
Start-up/shutdown
Starting the heating system
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! Please noteFrost protection is onlyensured for as long as thepower supply is stable.Switch ON the power supply(MCB/fuse, mains isolator)and the control unit ON/OFFswitch.
Shutting down the heating system
■ If you do not intend using your heatingsystem for a while, such as during asummer holiday, switch off centralheating and DHW heating (see page 14).
■ You can switch your heating systemOFF at the ON/OFF switch if you donot intend using it.We recommend you contact yourheating contractor if you are planningto take your heating system out of usefor long periods.Your heating contractor can then takesuitable steps such as frost protectionfor the system or heating surface pres-ervation as required.
Shutting down the heating system
1. Switch ON/OFF switch B OFF.The display goes blank.
2. Close gas shut-off valve C.
NoteThe system is no longer protectedagainst frost.All control unit settings are retained.
Start-up/shutdown
Starting the heating system (cont.)
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Shutting down central heating
You do not want to heat your interior butyou want to have DHW available (sum-mer mode).
Press the following keys:
1. the set boiler water temperatureflashes and will be displayed.
2. until "OFF" is displayed.
°C
3. OK to confirm.
Note■ The circulation pump briefly starts
every 24 hours to prevent it from seiz-ing up.
■ Boiler frost protection is enabled.
Stopping DHW heating
You do not want to have DHW availa-ble
Press the following keys:
1. MODE
2. / until flashes.
3. OK to confirm.The set DHW temperatureflashes.
4. until "OFF" is displayed.
°C
5. OK to confirm.
Start-up/shutdown
Shutting down central heating and DHW heating
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Operation without room temperature controller ― Setting theheating water temperature
If no outside temperature sensor and noroom temperature controller is connec-ted. The room temperature is influenced bythe heating water temperature. In thedelivered condition, the heating watertemperature is set to 70 °C.
Press the following keys:
1. / the set heating water tempera-ture flashes and will be dis-played.
2. / until the required heating watertemperature is displayed.
°C
3. OK to confirm.
Operation with room temperature controller ― Setting the boilerwater temperature
If no outside temperature sensor is con-nected, but a room temperature control-ler is. Set the boiler water temperature highenough if the required room temperaturecannot be achieved. In the deliveredcondition, the boiler water temperature isset to 70 °C.
Press the following keys:
1. / the set boiler water temperatureflashes and will be dis-played.
2. / until the required boiler watertemperature is displayed.
°C
3. OK to confirm.
Adjusting the room temperature
Setting the central heating temperature55
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Weather-compensated operation ― setting the room tempera-ture
An outside temperature sensor must beconnected for weather-compensatedoperation. In the delivered condition, a parametervalue of 20 is set for central heating.Should you wish to set a higher roomtemperature, increase the parametervalue; reduce it for a lower room temper-ature.
Press the following keys:
1. / the set parameter flashes and will be displayed.
2. / until the required room temper-ature is achieved.
NoteWhen adjusting this setting,bear in mind that your heatingsystem requires some time toheat the interior to the requiredtemperature.
3. OK to confirm.
Adjusting the room temperature
Setting the central heating temperature (cont.)
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Press the following keys:
1. MODE
2. / until flashes.
3. OK to confirm.The set DHW temperatureflashes.
4. / to set the required DHWtemperature.
°C
5. OK to confirm.
Setting the DHW temperature
DHW temperature55
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Emissions test mode should only be acti-vated by your flue gas inspector duringthe annual inspection.Various output stages can be set forchecking the flue gas.
Press the following keys:
1. MODE
2. / until "SERV" flashes.
3. OK to confirm."OFF" flashes (test modedisabled).
4. / to set the required burneroutput.
Display Display
Burneroutput
_ 20 20 %_ _ 40 40 %_ _ _ 60 60 %_ _ _ _ 80 80 %_ _ _ _ _ 100 100 %
5. OK to confirm.Test mode enabled.
Ending emissions test mode
NoteThis function will also terminate auto-matically after 30 minutes.
Press the following keys:
1. MODE
2. / until "SERV" flashes.
3. OK to confirm. The value set lastflashes.
4. until "OFF"flashes.
5. OK to confirm.Test mode is now disabled.
Emissions test mode
Starting emissions test mode (to be used by a competent person only)
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Cause RemedyRoom temperature controller incorrectlyset.
Set the required room temperature at theroom temperature controller.
The heating system is switched off. ■ Switch the ON/OFF switch ON.■ Switch the mains isolator ON (if instal-
led).■ Check the MCB/fuse in the power dis-
tribution board (main domestic MCB/fuse).
Control unit incorrectly set. ■ Operation with room temperature con-troller:Set a higher boiler water temperature(see page 15).
■ Weather-compensated operation:Set a higher room temperature (seepage 16).
Symbol flashes and a fault code (e.g.F2) will be displayed.
Notify your local heating contractor.The indication disappears when the faulthas been removed.
No fuel. Open the gas shut-off valve.■ If necessary, check with your gas sup-
ply utility.
Rooms are too hot
Cause RemedyRoom temperature controller incorrectlyset.
Set the required room temperature at theroom temperature controller.
Control unit incorrectly set. ■ Operation with room temperature con-troller:Set a lower boiler water temperature(see page 15).
■ Weather-compensated operation:Set a lower room temperature (seepage 16).
SERV is displayed (the service functionhas been enabled).
The service function will terminate auto-matically no later than after 30 minutes.
What to do if...
Rooms are too cold55
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Cause RemedyHeating system switched off. ■ Switch the ON/OFF switch ON.
■ Switch the mains isolator ON (if instal-led).
■ Check the MCB/fuse in the power dis-tribution board (main domestic MCB/fuse).
Control unit incorrectly set. Set a required DHW temperature (seepage 17).
Symbol flashes and a fault code (e.g.F2) will be displayed.
Notify your local heating contractor.The indication disappears when the faulthas been removed.
No fuel. Open the gas shut-off valve.■ If necessary, check with your gas sup-
ply utility.
The DHW is too hot
Cause RemedyControl unit incorrectly set. Set a required DHW temperature (see
page 17).SERV is displayed (the service functionhas been enabled).
The service function will terminate auto-matically no later than after 30 minutes.
What to do if...
There is no hot water
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The appliance may be cleaned with acommercially available domestic clean-ing agent (non-scouring).
Inspection and maintenance
The inspection and maintenance of aheating system is prescribed by theEnergy Saving Ordinance [EnEV - Ger-many] and the DIN 4755,DVGW-TRGI 2008 and DIN 1988-8standards.
Regular maintenance ensures trouble-free, energy efficient and environmen-tally responsible heating. For this, westrongly advise you to arrange aninspection and maintenance contractwith an authorised heating contractor.
Boiler
Increasing boiler contamination raisesthe flue gas temperature and therebyincreases energy losses. All boilersshould therefore be cleaned annually.
Power cable
Never replace faulty power cables. Havea qualified electrician replace faultycables.
Upkeep
Cleaning55
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Heating water temperature
The temperature of the heating waterthat flows to the radiators (roughly equalto boiler water temperature).
Boiler water temperature
The heating water in the boiler (boilerwater) is heated to the temperature setat the control unit. This temperature isreferred to as boiler water temperature.
Room temperature-dependent opera-tion
A room temperature controller capturesthe room temperature and compares thiswith the required room temperature youset. If the room temperature is lower thanthe required value, the boiler is switchedon; if the room temperature is higherthan the required value, the boiler isswitched off.Make any settings on the connectedroom temperature controller using therelevant operating instructions.
NoteThe boiler water temperature must beset high enough in order to achieve therequired room temperature.
Safety valve
A safety device (pressure relief valve)which must be installed in the cold waterpipe if the mains water pressure exceeds10 bar. The safety valve opens if a cer-tain pressure has been reached.
Flow temperature
The temperature of the heating waterthat flows to the radiators (in the flowline). Accordingly, the temperature of theheating water that flows from the radia-tors to the boiler (in the return line) isreferred to as return temperature.
Weather-compensated operation
In weather-compensated mode, theboiler water temperature is regulatedaccording to the prevailing outside tem-perature. For this, a temperature sensormounted outside the building envelopemust be connected to your heating sys-tem. The outside temperature is captured andtransmitted to the control unit by this sen-sor.
Appendix
Terminology
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BBoiler water temperature....................15– Explanation.....................................22
CCentral heating– Energy saving...................................8Cleaning.............................................21Commissioning..................................12Controls................................................9
DDHW heating– Energy saving...................................8DHW temperature..............................17DHW too hot......................................20Display...............................................10Display elements..................................9
EEmissions test mode..........................18Energy saving (tips).............................8
FFault display.................................19, 20Flow temperature– Explanation.....................................22Frost protection......................12, 13, 14
GGas shut-off valve........................12, 13Glossary.............................................22
HHeating– Energy saving...................................8Heating water temperature– Explanation.....................................22– Setting......................................10, 11
IInspection...........................................21
KKeys.....................................................9
MMaintenance......................................21
NNo hot water.......................................20
OON/OFF switch..............................9, 12Outside temperature..........................11
PPower failure........................................8Pressure gauge..............................9, 12Programming unit.................................9
RRemote control...................................11– With................................................11– Without...........................................10Rooms are too cold............................19Room temperature.............................10– Energy saving...................................8– Setting......................................10, 11Room temperature controller– With................................................11– Without...........................................10Room temperature-dependent opera-tion– Explanation.....................................22Room thermostat.................................9Rotary selector...................................10
SSafety valve– Explanation.....................................22Service function...........................19, 20Setting the room temperature............15Shutting down....................................13Shutting down central heating............14Shutting down the system..................13
Keyword index
Keyword index55
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Standby mode....................................13Starting the system............................12Stopping DHW heating......................14Summer mode...................................14Switching off a heating circuit............14Switching off central heating/DHW heat-ing......................................................14Symbols.............................................10
TTemperature, changing......................10Terminology.......................................22
Test mode..........................................18Tips– Energy saving...................................8Troubleshooting...........................19, 20
WWeather-compensated mode.............11Weather-compensated operation– Explanation.....................................22Window ventilation...............................8
Your contact
Contact your local contractor if you have any questions regarding the maintenanceand repair of your system. You may, for example, find local contractors on the internetunder www.viessmann.com.
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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Keyword index
Keyword index (cont.)
