Wolf CGU-2-18 User manual

WolfGmbH·Postfach1380·84048Mainburg·Tel.[phone]·Fax[phone]·Internet:www.wolf-heiztechnik.de
Operating instructions
as combi boilers and gas boilers
with integrated cylinder connection
CGU-2-18/24
CGG-2-18/24
CGU-2K-18/24
CGG-2K-18/24
Part no: 3062348_0511 Subjecttomodications GB

2 3062348_0511
Index
Index ...................................................................................................... Page
General information.................................................................................................... 2
Safetyinstructions ...................................................................................................... 3
Installationinformation/Maintenanceinformation .................................................. 4-5
Hydraulicconnections ............................................................................................... 6
Control unit operation ................................................................................................. 7
Informationforenergy-efcientoperation............................................................... 8-9
Faults/Faultcodes .................................................................................................... 9
Type plate (Example) Thetypeplateislocatedontheinsideoftheboilercasingandcontainsthefollowing
information:
Theseoperatinginstructionsarefortheattentionofthesystemuser.Theinstallation
andmaintenanceinstructionsaredocumentsintendedforthecontractor.
Enclosed documents
Gasisanenvironmentally-friendlyfuelwhichdoesnotrepresentanydangerunless
handledwithgross negligence.Yourgas red boiler is a high-quality productwhich
incorporatesthelatestsafetytechnology.
These safety instructions should protect you from potential risks.
General notes

3062348_0511 3
Safety instrucions
If you smell gas - Neverturnonalightswitch.
- Neveroperateelectricalswitches.
-Keepnakedamesaway.
- Closethegasshut-offvalve.
- Openwindowsanddoors.
- Informyourgassupplyutility;useatelephoneoutsidethedangerarea.
Caution - risk of poisoning, suffocation and explosion.!
If you smell ue gas - Shutthesystemdown.
- Openwindowsanddoors.
- Notify your local contractor.
Caution - risk of poisoning.
When changing a fuse - Isolatetheboilerfromthemainssupplypriortochangingafuse.Themainsterminals
oftheboilerare‘live’evenwhentheON/OFFswitchhasbeenswitchedOFF.
Caution - risk of electrocution.
Frost protection AslongastheboilerisswitchedON,itwillbeautomaticallyprotectedagainstfrost.
Theuseofanti-freezeisnotpermissible.
Completelydraintheboilerifnecessary.
Caution - risk of water damage and faulty function through freezing.
Balanced ue system
(only CGG-2)
With low outside temperatures, the water vapour contained in the ue gas may
condenseandfreezeonthebalancedue.This ice may fall from the roof causing
injury or material losses. Preventicefromfallingbytakingon-sitemeasures,e.g.the
installationofasnowcatchergrille.
Caution - risk of injury.
SAFETY INSTRUCTIONS

4 3062348_0511
Installation information /
Maintenance information
Donotuse(forcleaning,polishing,etc.)orstoresprays,solvents,chlorinatedcleaning
agents,paints,lacquer,adhesives,salts,etc.onorinthevicinityofthegasredboiler.
Underunfavourableconditions,thesematerialsmayleadtocorrosionintheboilerand
theuegassystem.Ductedventsroutedthrougharoofmayalsocontaincorrosive
vapours.
Caution - ignoring this rule may lead to a risk of re as well as a risk of
destruction, poisoning or explosion.
Corrosion protection
- Yourgasredboilershouldonlybeinstalledandmodiedbyanapprovedheating
contractor,asonlytheyhavetheessentialknowledgetocarryoutsuchwork.
- Gascomponentsmustnotbemodied.
- Never close or restrict the ventilation apertures in doors or walls when
operating the boiler in the open ue mode; only start the boiler when the ue
has been fully installed.
- Only operate the boiler in balanced ue mode, after the balanced ue system
has been fully installed and the wind protector is not covered up.
- Thegasredboilermayonlybeinstalledinroomsthatareprotectedfromfrost.
- Neverisolatetheboilerfromthepowersupplywhenoutsidetemperaturesfallbelow
freezing,asotherwisethereisariskofthesystemfreezing-up.
- Donotmodifythedrainorthesafetyvalve.
Caution - ignoring this rule may lead to a risk of re, as well as a risk
of destruction, poisoning or explosion.
Do not use or store explosive and ammable materials, e.g. petrol,
thinners, paints, paper, etc. inside the boiler room.
Positioning / modications
Energy, and therefore operating costs, can be effectively saved through low DHW
temperatures.Furthermore,scalingupoftheat-plateheatexchangerinthegascombi
boiler version can beprevented. If the water’s hardness is greater than 15°d.H. the
cylinderwatertemperatureshouldbelimitedto55°C.
Water hardness

3062348_0511 5
Installation information /
Maintenance information
Cleanthecasingwithadampclothandamildcleaningagent(whichmustnotcontain
chlorine).Thendryimmediatelyafterwards.Thegasredboilercomponentsmayonly
be cleaned by a heating contractor.
Care
Caution - only the heating contractor has the required knowledge and
expertise!
- Accordingtotheregionalregulations,theuserisobligedtoarrangeregularmainte-
nanceofthesystem,inordertoensurethereliableandsafefunctionofthegasred
boiler.
- Yourboilershouldbeservicedannually.
- Maintenanceisexplicitlydetailedintheinstallationandmaintenanceinstructions.
- Isolatetheboilerpowersupplybeforeanymaintenanceworkiscarriedout.
- Aftercompletingmaintenance,andbeforethegasredboilerisrestarted,ensure
thatallcomponentsthathavebeenremovedformaintenancehavebeenproperly
retted.
- Werecommendyouarrangeamaintenancecontractwithanapprovedheatingcon-
tractor.
Please keep your operating instructions safe, in an easily accessible place
near your gas red boiler.
Maintenance

6 3062348_0511
Hydraulic connections
Please note before commissioning
The heating system must be completely lled with water. If necessary top up with
water.Whenllingtheheatingsystem,theshut-offvalvesmustbeopen.Thesystem
pressuremustbe1.5to2.5bar.Theconnectionbetweenthetapwaterandheating
waterrequiredforllingmustberemovedafterthellhasbeencompleted.Otherwise
thereisariskthatyourtapwaterwillbecontaminatedbyheatingwater.
The system may overheat if the boiler is operated without water.
Inhibitors are not permissible. Otherwise there is a risk of damage to
the boiler.
Filling the system
Note
Theshut-offvalvesforheatingowandheatingreturnmustbeopen.
Opening the shut-off
equipment
Regularly check the system pressure. The pressure gauge must indicate between
1.5and 2.5bar.Yourheatingcontractorwill explain howtotop upyoursystem. Do
not supplement your heating water with additives, otherwise components may be
damaged.
Checking the heating
water
Shut-off valves
(accessory)
Fill and drain connection
Heating return
(incl.llanddrain
connection)
Heating ow
(incl.llanddrain
connection)
Gas ball valve
Open:Pushandturnanti-clockwise
Close:Turnclockwise
Maintenance valve
Heating return
Close
Open
Maintenance valve
Heatingow
Close
Open

3062348_0511 7
Control unit operation
Control unit operation
ON/OFFswitch
DHW temperature
selector
Heatingwater
temperature
selector
Resetbutton Thermometer
Pressure
gauge
Illuminated
signalring
Illuminated signal ring as status
indicator Illuminated signal ring Explanation
Flashinggreen Standby(powersupplyON,burnerOFF,
e.g.summermode)
Constantgreenlight Wintermode:Pumprunning,burnerOFF
Flashingyellow Emissionstestmode
Constantyellowlight Burneroperates,ameON
Flashingred Fault
Summermode(heatingOFF)
Wintermodeposition2to8
Emissionstestmode
(illuminatedringashesyellow)
DHW temperature selector,
boiler *
1(15°C)...9(65°C)Gasboilerwithcylinder
1(40°C)...9(65°C)Gascombiboiler
Heating water temperature
selector 2(40°C)...8(80°C)
* When the hardness of the water is over 15°d.H. (2.5mol/m³) the cylinder water
temperaturemaybesettoamaximumof55°C.Thiscorrespondswithoutaccessory
controllertoasettingof5-6ontheDHWtemperatureselectorwithgascombiboilers
or6-7ongasboilerswithcylinders.
The BM programming module can also be integrated into the control unit of gas
redboilers.Thatmeansthatalladjustmentsaremadeatthecontrolunitofthegas
red boiler. For installation and operation, see BM programming module operating
instructions.
Note:

8 3062348_0511
Information for energy-efcient
operation
Saving energy with modern heating technology: A Wolf boiler saves you hard
cash.
Withmoderncondensingtechnologyenergyisusedefcientlyforheating.
Use as little electrical energy as possible.
Operatethesystemwiththeheatingpumpatthelowestpossiblelevel.
Regular heating system maintenance pays for itself.
Acontaminatedburnerorpoorlyadjustedgasboilercanreducetheheatingsystem
efciency.Regularheatingsystemmaintenancethroughyourlocalcontractorquickly
paysforitself.
Heating at the lowest energy level
Operateyourheatingsystem,wherepossible,withareturntemperatureoflessthan
45°C,toachievethehighestpossibleenergyutilisation.
A heating system control unit also regulates your heating costs
A heating system in standby mode saves energy.A modern, weather-compensated
orroomtemperaturedependentheatingsystemcontrolunitensures-withautomatic
nightsetback andthermostaticvalves -thatthe systemonlyoperates whenheatis
required,savingmoneyfortherestofthetime.
- Equipyourheatingsystemwithaweather-compensatedheatingcontrollerfromthe
Wolfrangeofaccessories.Yourheatingcontractorwillbehappytoadviseyouabout
optimumadjustments.
- InconjunctionwiththeWolfcontrolaccessories,usethenightsetbackfunctionto
matchtheenergyleveltotheactualdemandperiod.
- Usetheoptionalsummermodeadjustment.
Never overheat your home
Adjust the room temperature as accurately as possible. This leaves occupants
comfortable,andenergyisnotwastedonprovidingaheatingoutputthatisnotrequired
byanyone.Differentiatebetweentheoptimumtemperaturefordifferentrooms,such
aslivingroomsandbedrooms.
A room temperature which is one degree higher than necessary represents an
additionalenergyconsumptionofapprox.6%.
- Use room thermostats to match the room temperature to the actual use of the
room.
- In the room, where you have installed a room temperature sensor, open the
thermostaticvalvefully.Thisenablesyoutoachieveoptimumcontrolcharacteristics
foryourheatingsystem.
Ensure adequate air circulation
Air must be able to freely circulate near the radiators and the room temperature
sensors,otherwisetheheatingsystemwillloseeffectiveness.Badlypositionedlong
curtainsorfurniture“swallow”upto20%ofenergy.
Heating mode

3062348_0511 9
Information for energy-efcient
operation
Keep the heat inside the room - at night too
Atnight,closing shutters and drawing curtains noticeably reduces heat lossviathe
windowareas.Insulatingtheradiatorrecessesandlightcolouredpaintworkcanreduce
yourheatingbillsbyupto4%.Airtightjointsatwindowsanddoorsalsohelptokeep
energyinsidetheroom.
Minimise energy loss through sensible ventilation
Ventilatingforhourslosesheatstoredinwallsandobjects.Asaresult,theambient
climatewillonlybecomecomfortableagainafterprolongedheating.Shortandthorough
airingismoreeffectiveandpleasant.
Venting the radiators
Regularly vent the radiators in every room. This safeguards the perfect function of
radiatorsandthermostats,particularlyintheupperapartmentsofapartmentblocks.
Theradiatorwillthenbeabletorespondquicklytochangingheatdemands.
Intelligent use of DHW circulation pumps
AlwayscontrolDHWcirculationpumpsviatimeswitches.Programtheseinaccordance
withyourDHWdemandpatterns.
The optimum DHW temperature
Onlyever set the DHWtemperature,orthat of thecylinder,to thetemperatureyou
reallyrequire.Anyadditionalheatingusesadditionalenergy.
Whenthehardnessofthewaterisover15°d.H.(2.5mol/m³)theDHWtemperature
maybesettoamaximumof55°C.Thiscorrespondswithoutaccessorycontrollertoa
settingof5-6ontheDHWtemperatureselectorwithgascombiboilers,or6-7ongas
boilerswithcylinders.Theactualtemperaturethenfallsbetween50°Cand55°C.
Sensible handling of DHW
Showering consumes only approx. 1/3 of the water volume required for a bath.
Immediatelyrepairanydrippingtaps.
DHW mode
Iftheilluminatedringofthestatusindicatorashesred,wherepossiblereadthefault
codeof the connected controller andnotethecode.Theboilercanbe restarted by
pressingtheresetbutton.Incaseofrepeatedfaults,switchOFFtheboilerandnotify
your heating contractor.
GasboilersfromtheCGU-2seriesareequippedwithanelectronicuegasmonitor.
Ifuegasisescapingatthedraughthoodthisshutsdownthegasboiler.Theboiler
restartsautomaticallyafterapprox.15mins.
Caution - risk of damage, poisoning and suffocation.
Faults / Fault codes

10 3062348_0511
Notes

3062348_0511 11
Notes