Wolf CGB-75 Maintenance Instructions Manual page 9

Then clean and refill the siphon.
Assembly
Assembly is carried out in reverse order, observing the following
points:
• Before refitting the heat exchanger cover, lubricate the O-ring
with silicone grease.
• Check the burner gasket for damage before fitting (replace if
necessary) and ensure it is fitted correctly.
• Check gasket at gas combination valve for gas supply, tighten
threaded connection.
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.
Restart / flue 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 CO > 0.2%, check that there are no leaks in the
2
balanced flue:
Flue gas test
Carry out the test in emissions test mode and enter the values
in the maintenance report.
Re-adjust the CO content, if required (see installation
2
instructions).
Leak test on non-return valve in flue gas cascades
Set the first boiler to emissions test mode.
Test the ventilation air at the other boilers in standby mode.
The CO content of the ventilation air must not exceed 0.3% after
2
one minute. Otherwise, check the non-return valve at the fan.
Carry out the same test for the other boilers.
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Maintenance procedure
Expansion vessel
Figure: Flue gas test with a closed boiler
Siphon
Emissions test mode position
Test port
"Intake air"
Test port
"Flue gas"
9