Wolf CGB-75 Technical specifications

Maintenance instructions
Gas condensing boiler
CGB-75 Wall mounted boiler
CGB-100 Wall mounted boiler
Document no. 30 62 556 Subject to modications 07/09 GB
Wolf GmbH · Postfach 1380 · D-84048 Mainburg · Tel. [phone] · Fax [phone] · Internet: www.wolf-heiztechnik.de

230 62 556_0709
Index ......................................................................................................Page
Safety instructions ........................................................................................ 3
Maintenance procedure............................................................................. 4-9
Overview of the steps to be taken and maintenance report .................. 10-11
List of required parts................................................................................... 12
Index
For easy maintenance!

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30 62 556_0709
The following symbols are used in conjunction with these
important instructions concerning personal safety, as well
as operational reliability.
"Safety instructions" are instructions with which
you must comply exactly, to prevent risks and
injuries to individuals and material losses.
Danger through 'live' electrical components!
NB: Switch OFF the ON/OFF switch before
removing the casing.
Never touch electrical components or contacts
when the ON/OFF switch is in the ON position!
This results in a risk of electrocution that may
lead to injury or death.
The main supply terminals are 'live' even when
the ON/OFF switch is in the OFF position.
"Note" indicates technical instructions that you
must observe to prevent material losses and
boiler malfunctions.
Safety instructions
General notes
Maintenance work must only be carried out by a
qualied heating contractor.
Regular maintenance and the exclusive use of original
Wolf spare parts are necessary preconditions for
trouble-free operation and a long service life.
We therefore recommend you arrange a maintenance
contract with a local heating contractor.
NB
Figure: Terminal box - danger from electrical voltage
Figure: Ignition transformer, high voltage ignition electrode, heat
exchanger
Danger from electrical voltage
Risk of burning from hot components
Figure: Gas combination valve
Danger from electrical voltage
Escaping gas may cause poisoning or an explosion
Figure: Gas connection
Escaping gas may cause poisoning or an explosion

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Maintenance procedure
The mains terminals are 'live' even when the
ON/OFF switch has been switched OFF.
Disconnect the system from the power supply.
Pivot the control unit ap down.
Switch OFF the condensing boiler at the ON/OFF switch.
Close the gas tap.
Undo screws on front casing cover. Release the bottom of the
front casing cover and unhook at the top.
Danger of burning
Leave to cool down for half an hour before beginning
maintenance work on the appliance
Seal the front casing tightly with screws after
completing the service. There is a risk of carbon
monoxide poisoning if the ue system is faulty.
Screws

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Maintenance procedure
Pull out plug:  Ignition electrode
 Earth conductor
 Monitoring electrode (ionisation)
 Thermostat
 Gas fan
 Fan variable speed control
 Solenoid valve (rst undo Phillips head screw)
 Modulation coil (rst undo Phillips head screw)
New photo!
Undo screws on upper casing cover (left / right).
Pull the cover forwards slightly and lift off.

630 62 556_0709
Maintenance procedure
Undo 6 mm Allen screws (3x) on the heat exchanger cover and
the fan manifold. Remove fan with manifold.
Undo gas connection at the gas combination valve.
Remove burner gasket and burner,
clean burner with a vacuum cleaner or ush with water.

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Maintenance procedure
Replace O-ring annually
Remove heat exchanger cover
O-ring
Undo star shaped handles (3x)
Lift heat exchanger cover using maintenance tool

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Maintenance procedure
Cleaning the heating surface:
Hook the maintenance tool into the combustion chamber and
pull out the chamber.
Rotate the maintenance tool 90°, hook into the lifting eye of the
rst combustion chamber extension and pull out the chamber
extension.
Repeat for the second combustion chamber extension.
Clean the heat exchanger with the brush. Clean the condensate
pan with a vacuum cleaner or ush with water.
Maintenance
tool
Replace ignition and monitoring electrodes
Monitoring electrode
Ignition electrode

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Maintenance procedure
Assembly
Assembly is carried out in reverse order, observing the following
points:
• Before retting the heat exchanger cover, lubricate the O-ring
with silicone grease.
• Check the burner gasket for damage before tting (replace if
necessary) and ensure it is tted correctly.
• Check gasket at gas combination valve for gas supply, tighten
threaded connection.
Restart / ue gas test
• Reset the MCB
• Open the gas tap
• Check the gas supply line for leaks
• Switch ON the boiler
• Set the program selector to emissions test mode
Testing the inlet air
If the CO2 > 0.2%, check that there are no leaks in the
balanced ue:
Flue gas test
Carry out the test in emissions test mode and enter the values
in the maintenance report.
Re-adjust the CO2 content, if required (see installation
instructions).
Leak test on non-return valve in ue gas cascades
Set the rst boiler to emissions test mode.
Test the ventilation air at the other boilers in standby mode.
The CO2 content of the ventilation air must not exceed 0.3% after
one minute. Otherwise, check the non-return valve at the fan.
Carry out the same test for the other boilers.
Before restarting:
• Check the system pressure, and top up heating water if
required.
• When you notice a loss of water, check the expansion vessel
pre-charge pressure and increase it, if required, to 0.75
bar. The heating circuit must be at zero pressure. Fill the
system.
Then clean and rell the siphon.
Siphon
Expansion vessel
Emissions test mode position
Figure: Flue gas test with a closed boiler
Test port
"Flue gas"
Test port
"Intake air"

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Overview of the steps to be taken
and maintenance report
Overview of the steps to be taken and maintenance report
No. Step Report item Report item Report item
1Switch OFF the boiler, emergency stop switch is OFF
2Close the gas supply valve
3Remove the casing and the combustion chamber housing
4Unplug the electrical connections from the fan, sensors and
electrodes
5Remove the combustion chamber lid upwards
6Clean the burner, if required OOO
7Clean the heating water heat exchanger OOO
8Clean the condensate pan OOO
9Clean the mixing chamber, if required OOO
10 Check the combustion chamber insulation for damage OOO
11 Check gaskets, and if required, replace them and
lubricate with silicone grease OOO
12 Rell granulate, if a neutralising system is installed OOO
13 Check the protective anode every two years on enamelled
cylinders OOO
14 Assemble the equipment
15 Clean and ll the siphon, install and check for tight t OOO
16 Descale the DHW heat exchanger, if required OOO
17 Clean the DHW strainer OOO
18 Check the expansion vessel in case of water loss OOO
19 Open the gas supply valve and start the boiler
20 Gas leak test OOO
21 Flue gas leak test OOO
22 Check the ignition OOO
23 Check the interaction with control accessories OOO
24 Flue gas test in emissions test mode OOO
25 Gross ue gas temperature °C °C °C
26 Ventilation air temperature °C °C °C
27 Net ue gas temperature °C °C °C
28 Carbon dioxide content (CO2)%%%
29 or oxygen content (O2)%%%
30 Carbon monoxide content (CO) %%%
31 Flue gas loss %%%
Conrm maintenance (company stamp, signature)

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Report item Report item Report item Report item Report item Report item Report item
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Overview of the steps to be taken
and maintenance report

12 30 62 556_0709
Check control accessories
List of required parts
Figure: AWTFigure: DWT
Figure: BM
BUS
connection
• The display must show
BUS connection.
Maintenance requires the following:
1Maintenance set CGB-75/100 Part no. 86 12 865
1Cleaning brush Part no. 24 40 053
1Tester for BImSch test
We recommend the following as part of your service kit:
1 10 g tube of silicone grease Part no. 86 02 264
1 Burner gasket Part no. 86 02 527
1Return temperature sensor Part no. 27 41 061
1Flow temperature sensor Part no. 27 41 058
1Flue gas temperature regulator Part no. 86 03 058
1Ignition electrode Part no. 86 12 425
1Monitoring electrode Part no. 86 03 059
1O-ring 320x8 silicone foam Part no. 89 05 729
1Double lip sealing ring Part no. 89 05 663
1Flow temperature limiter Part no. 86 03 038