Wolf CGB-2 Series Operating instructions

GB
IE
WOLF GMBH / POSTFACH 1380 / D-84048 MAINBURG / TEL. [phone] / FAX [phone] / www.WOLF.eu
Art.-Nr.: 3064812_201804 Subjecttotechnicalmodications
Serviceinstructionsforcontractors
Gas condensing boilers
CGB-2 (K)
CGW-2
CGS-2 L/R
from 2016 on

2 3064812_201804
Tableofcontents
1. Safety instructions...................................................................................3
2. Checking fault messages ........................................................................6
3. CGB-2 appliance description...................................................................7
4. CGB-2K appliance description ................................................................8
5. CGW-2 appliance description..................................................................9
6. CGS-2L appliance description...............................................................10
7. CGS-2R appliance description.............................................................. 11
8. Maintenance equipment
Maintenance spare parts set.................................................................12
9. Preparing for inspection/
maintenance..........................................................................................13
10. Opening the combustion chamber ........................................................14
11. Checking the burner..............................................................................15
12. Checking the ionisation and ignition electrodes ....................................17
13. Cleaning the heat exchanger ................................................................18
14. Assembling the heat exchanger............................................................20
15. Checking DHW heating.........................................................................22
16. Checking the combustion parameters...................................................23
17. HG control parameters..........................................................................24
18 Maintenance Report..............................................................................25
19 Notes.....................................................................................................26

3064812_201804 3
1. Safetyinstructions
Danger:ifyousmellgas
- Close the gas tap.
- Open the windows.
- Do not operate any electrical switches.
- Extinguish naked flames.
- Phone the gas supply utility company and an ap-
proved contractor from an external location.
Danger:ifyousmelluegas
- Switch OFF the appliance.
- Open windows and doors
- Notify an approved contractor.
Authorised personnel should read these instructions
before any installation, commissioning or service work.
Adhere to the specications in this document. Failure
to observe these installation instructions voids any
WOLF warranty.
The gas condensing boiler must be installed, commis-
sioned and maintained by qualied and trained person-
nel only. In accordance with VDE 0105 Part 1, work on
electrical components (e.g. control unit) may be carried
out only by qualied electricians.
VDE/ÖVE regulations [Germany/Austria] and those of
your local power supply utility are applicable to electri-
cal installation work.
Only operate the gas condensing boiler within its output
range, which is stated in the technical documentation
supplied by WOLF. Intended use of the boiler includes
exclusive use for hot water heating systems in accord-
ance with EN 12828.
Never remove, bypass or otherwise disable any safety
or monitoring equipment. Operate the boiler only if it is
in perfect technical condition.
Any faults or damage which impact or might impact
upon safety must be remedied immediately by a quali-
ed contractor. Replace faulty components and equip-
ment only with original WOLF spare parts.
Dangerfrom„live“electricalcomponents
Nevertouchelectricalcomponentsorcontacts
whentheON/OFFswitchisintheONposition.
Thereisadangerofelectrocution,resultingin
arisktohealthordeath.Themainterminalsare
‘live’,evenwhentheON/OFFswitchisintheOFF
position.
Riskofscalding
Boilersmaycontainhotwater.
Hotwatercancauseseverescalding.
Beforeworkingonpartswhichareincontact
withwater,allowtheappliancetocooltobelow
40°C,shutoffallvalvesand,ifnecessary,drain
theappliance.
Riskofburns
Boilercomponentsmaybeextremelyhot.
Hotcomponentscancauseburns.
Beforeworkingontheopenedupappliance,allow
ittocoolbelow40°Corwearsuitablegloves.
Symbols
The following warning symbols are used in these instructions.
These relate to personal safety and operational reliability.
Instructions that must be followed precisely in order
to prevent risk and injury to persons.
Instructions that must be followed precisely in order
to prevent risk and injury to persons from live electri-
cal components.
Indicates technical instructions that must be
observed to prevent damage to the boiler and
malfunctions.
Please
note

4 3064812_201804
1. Safetyinstructions
Dangerfrompressurisedwater
Boilersaresubjecttohighwaterpressure.
Waterpressurecancausesevereinjuries.
Beforeworkingonpartswhichareincontact
withwater,allowtheappliancetocooltobelow
40°C,shutoffallvalvesand,ifnecessary,drain
theappliance.
Note:
Sensorscanbeincontactwithwaterandthere-
foreexposedtopressure.
Workingonthesystem
- Close the gas shut-off valve and secure it against uninten-
tional reopening.
- Isolate the system from the power supply (e.g. by remov-
ing the separate mains fuse or by means of a main switch
or a heating emergency stop switch) and check to ensure
there is no voltage.
- Safeguard the system against reconnection.
Inspectionandservice
- Ensure the correct operation of the gas boiler by having a
contractor carry out inspections at least once a year and
maintenance/repair when required.
- (DVGW - TRGI 2008 - G600).
We recommend arranging a suitable maintenance contract.
- The operator is responsible for the safety, environmental
compatibility and energy quality of the heating system
(German Immission Control Act/Energy Saving Ordinance)
[Germany].
- Only use genuine WOLF spare parts.

3064812_201804 5
1. Safetyinstructions
Fig: Ignition transformer, high voltage ignition electrode,
combustion chamber
Danger from 'live' electrical components, risk of burning
from hot components
Fig: Gas combination valve
Danger from 'live' electrical components
Escaping gas may cause poisoning or an explosion
Gaskombiventil
Fig: Gas connection: Risk of poisoning or explosion in
the event of gas escaping
Fig: Terminal box: Danger from 'live' electrical compo-
nents

6 3064812_201804
2. Checkingfaultmessages
Any faults that have occurred during operation can be called up on the ‘Contrac-
tor’ level under ‘Message history’. Press rotary selector 5, select ‘Contractor’,
enter the code and call up ‘Message history’. The last 40 fault messages will be
displayed which can provide the contractor with information for maintenance.
Messagehistoryin
AM or BM-2
Either an AM display module or a BM-2 programming unit can be installed in
the front panel for operating the appliance.
The ON/OFF switch (integrated in the Wolf logo) switches the appliance off
across all poles.
ON/OFFswitch
Operatingmode
Heating mode
Burnerstatus
ON
Status
1
2
3
4
5
Status display Function display
1 - 4 Quick start keys
5Rotary selector with pushbutton function
Front panel with integral
ON/OFF switch

3064812_201804 7
3. CGB-2appliancedescription
1 Gas fan
2 Expansion vessel
3 Mixing valve
4 Gas valve
5 Trap
6 3-way valve
7 Control unit enclosure
(GBC-e burner control unit, top)
(HCM-2 control unit PCB, bottom)
8 Flue pipe
9 Combustion chamber cover HLSC (thermostat)
10 Combustion chamber temperature sensor
(eHLSC sensor)
11 Burner
12 Heating water heat exchanger
13 Flue gas temperature sensor
14 Pressure sensor
15 Return temperature sensor
16 Boiler water temperature sensor
17 Heating circuit pump with air vent valve
22 Heating return
23 Cylinder return
24 Gas supply pipe
25 Cylinder ow
26 Heating ow
CGB-2
Wall mounted gas condensing boiler
1
8
9
10
11
12
13
14
15
16
17
22
23
25
24
26
2
3
4
6
5
7

8 3064812_201804
4. CGB-2Kappliancedescription
1 Gas fan
2 Expansion vessel
3 Mixing valve
4 Gas valve
5 Trap
6 3-way valve
7 Control unit enclosure
(GBC-e burner control unit, top)
(HCM-2 control unit PCB, bottom)
8 Flue pipe
9 Combustion chamber cover HLSC (thermostat)
10 Combustion chamber temperature sensor
(eHLSC sensor)
11 Burner
12 Heating water heat exchanger
13 Flue gas temperature sensor
14 Pressure sensor
15 Return temperature sensor
16 Boiler water temperature sensor
17 Heating circuit pump with air vent valve
18 Plate heat exchanger
19 Flow limiter
20 Flow sensor
21 DHW outlet temperature sensor
22 Heating return
23 Cold water connection
24 Gas supply pipe
25 DHW connection
26 Heating ow
CGB-2K
Wall mounted gas condensing combi boiler
1
8
9
10
11
12
13
14
15
16
17
18
19
20
21
2
3
4
6
5
7
22
23
25
24
26

3064812_201804 9
5. CGW-2appliancedescription
CGW-2
Gascondensingcentre
4
2
1
3
19
17
18
20
21
22
24
26
25
27
28
23
5
6
7
9
8
10
13
11
12
14
15
16
1 Flue pipe
2 Combustion chamber cover HLSC (thermostat)
3 Combustion chamber temperature sensor
(eHLSC sensor)
4 Gas fan
5 Expansion vessel
6 Mixing valve
7 Gas valve
8 Trap
9 3-way valve
10 Control unit enclosure
(GBC-e burner control unit, top)
(HCM-2 control unit PCB, bottom)
11 Plate heat exchanger
12 DHW outlet temperature sensor
13 Non-return valve
14 Heating ow (accessory)
15 Gas supply pipe
16 Heating return (accessory)
17 Burner
18 Heating water heat exchanger
19 Flue gas temperature sensor
20 Pressure sensor
21 Return temperature sensor
22 Boiler water temperature sensor
23 Heating circuit pump with air vent valve
24 Cylinder temperature sensor
25 DHW connection
26 BDF valve/DHW circulation connection
27 Cold water connection
28 Cylinder primary pump

10 3064812_201804
6. CGS-2Lappliancedescription
CGS-2L
Gascondensingcentre
1
19
17
14
18
15
16
20
21
22
24
25
27
26
29
28
30
23
2
3
4
6
5
7
8
9
10
11
12
13
1 Gas fan
2 Expansion vessel
3 Mixing valve
4 Gas valve
5 3-way valve
6 Trap
7 Control unit enclosure
(GBC-e burner control unit, top)
(HCM-2 control unit PCB, bottom)
8 Plate heat exchanger
9 DHW outlet temperature sensor
10 Heating ow
11 Gas supply pipe
12 Heating return
13 DHW circulation connection
14 Flue pipe
15 Combustion chamber cover HLSC (thermostat)
16 Combustion chamber temperature sensor
(eHLSC sensor)
17 Burner
18 Heating water heat exchanger
19 Flue gas temperature sensor
20 Pressure sensor
21 Return temperature sensor
22 Boiler water temperature sensor
23 Heating circuit pump with air vent valve
24 Heating circuit safety valve
25 Non-return valve
26 Cold water connection
27 Cylinder primary pump
28 DHW connection
29 Protective anode
30 Cylinder temperature sensor

3064812_201804 11
7. CGS-2Rappliancedescription
CGS-2R
Gascondensingcentre
1
18
16
13
17
14
15
19
20
21
23
25
26
27
24
28
22
2
3
4
6
5
7
12
8
9
10
11
1 Gas fan
2 Expansion vessel
3 Mixing valve
4 Gas valve
5 3-way valve
6 Trap
7 Control unit enclosure
(GBC-e burner control unit, top)
(HCM-2 control unit PCB, bottom)
8 Heating ow
9 Gas supply pipe
10 Heating return
11 DHW circulation connection
12 Cylinder ow
13 Flue pipe
14 Combustion chamber cover HLSC (thermostat)
15 Combustion chamber temperature sensor
(eHLSC sensor)
16 Burner
17 Heating water heat exchanger
18 Flue gas temperature sensor
19 Pressure sensor
20 Return temperature sensor
21 Boiler water temperature sensor
22 Heating circuit pump with air vent valve
23 Heating circuit safety valve
24 DHW connection
25 Cold water connection
26 Protective anode
27 Cylinder return
28 Cylinder temperature sensor

12 3064812_201804
8. Maintenanceequipment
 Maintenancesparepartsset
Maintenancerequiresthefollowing:
1 Maintenance set Part no. 86 14 984
1 Cleaning set Part no. 86 03 194
1 Measuring instrument for immission test [BImSch - Germany]
Werecommendyoucarrythefollowingpartsinyourservicekit:
1 Universal installation key Part no. 17 31 146
1 Flue gas temperature sensor Part no. 27 45 24 399
1 Displacer Part no. 17 31 02 299
1 Protective anode for enamelled cylinder (for CGS-2) Part no. 24 45 128

3064812_201804 13
9. Preparingforinspection/
maintenance
Isolatingthesystemfromthepowersupply
The mains terminals remain 'live' even when
the ON/OFF switch has been switched OFF.
- Disconnect the system from the power supply.
Closethegasballvalve.
OpeningtheCGW-2
First, grip the control unit cover on the r.h. side and
swivel to the side.
Then undo the two screws on the r.h. and l.h. sides of
the front casing.
The front casing can then be released at the top and
removed.
Pull the bottom of the cylinder casing forwards, release
it at the top and remove.
1
2
OpeningtheCGS-2
To remove the cylinder front casing, undo the two screws on
the r.h. and l.h. side.
The casing can then be pulled forwards and removed.

14 3064812_201804
10.Openingthecombustionchamber
Riskofburns
Various components may be very hot.
Let them cool down or wear gloves.
Releasethelockofthegassupplypipetothemixing
chamber.
Press the locking lever and push the gas pipe upwards.
(O-ring will be visible.)
Disconnect both connection plugs on the gas fan.
PulloutthemonitoringelectrodeandHLSCplugs.
Pullouttheignitiontransformerplug.
FittheWolfcleaningvesseltotheappliance.
Pulloutthelockingclipfromthebottomrotaryentry
at the bottom.

3064812_201804 15
11.Checkingtheburner
Position the installation key (accessory) and lift the
combustionchamberandswingitout.
The heating water does not need to be drained as the
work can be carried out at system pressure.
●Visualinspectionofgasketsofgassupply
Inspet and if required replace gaskets of gas supply to
mixing chamber. Grease gaskets.

16 3064812_201804
Removingthecombustionchambercover
Open the retaining tabs for the combustion chamber
cover at the front and back.
Lift off the gas fan unit with the combustion chamber
cover.
●Visualburnerinspection
In principle, the burner is maintenance-free.
Carry out a visual check of the burner for damage or
deposits.
Replace if damaged, clean in case of deposits (deter-
gent, damp cloth).
After cleaning or replacing the burner, carry out a 100 %
calibration.
- See description HG43 in chapter
“Parameter description”
Replace the burner gasket after replacing or cleaning
the burner.
●Visualinspectionoftheburnergasket
Clean the supporting surface on the combustion cham-
ber cover and the burner ange. Replace the burner
gasket without lubricating it!
●Graphiteseal
Clean the supporting surfaces. Install or replace graphite
seal.
●Visualinspectionofrefractorybrick
Inspect and if required replace refractory brick.
11.Checkingtheburner

3064812_201804 17
12.Checkingtheionisationandignition
electrodes
Repacingtheignitionelectrode
Replace ignition electrode with every maintenance.
Check spacings and adapt if not correct.
Replacingtheionisationelectrode
Replace ionisation electrode with every maintenance.
Tighten the electrode xing screws with a torque of
3,0 Nm.!
Carry out a 100 % calibration after working on
the ionisation electrode.
See description HG43 in chapter
“Parameter description” in the installation
instructions.
Fig.: Ionisation electrode gap
Fig.: Ignition electrode gap

18 3064812_201804
13.Cleaningtheheatexchanger
The heat exchanger can be cleaned under pressure
and with swung out combustion chamber.
Push the combustion chamber module upwards
(loosen if necessary).
Then rotate and remove it downwards.
Cleaningthecobustionchamber
Never use a metal brush for cleaning as this
will destroy the protective coating of the nned
tube
Cleanresiduesfromthecondensatepan

3064812_201804 19
13.Cleaningtheheatexchanger
If you notice a loss of water, check the expansion
vessel pre-charge pressure.
The connection valve is at the top rear
and is secured with a protective cap.
When the heating circuit is depressurised, the
pre-charge pressure should be about 0.75 bar.
Replace the top and bottom combustion chamber
gaskets.
After installing the gaskets, lubricate them with
silicone grease on the outside.

20 3064812_201804
14.Assemblingtheheatexchanger
Assemblyofthecombustionchamber
Install cobustion chamber pot.
Turn pot until stop and secure by drawing downwards.
Check secure t.
Put combustion chamber cover outo the chamber and
press down regularly.
Check perfect t of combustion chamber gasket.
Lock both retaining brackets with assembly tool.
Putonplugsoutoignitionandionisationelectrodes
aswellasonignitiontransformerandsafetytempe-
rature cutout (STB)