Co Adjustments - Wolf CGB-75 Installation And Operating Instructions Manual

Setting the gas/air mixture
Carry out the adjustments in the order described below. The gas combination valve has been set at the factory
Note
to the gas type specified on the type plate. Only adjust the gas combination valve after the system has been
changed to a different gas type or when servicing.
If too little heat is drawn off, open some radiator valves.
A) CO setting for upper load (emissions test mode)
2
Release the casing cover with the l.h. and r.h. screw. Release
the bottom of the casing cover and unhook at the top.
- Remove the screw from the l.h. "Flue gas" test port.
- Insert the test probe of the CO
gas" test port (approx. 120 mm).
- Turn the temperature selector to "Emissions test"
.
(illuminated signal ring as status indicator flashes yellow.)
- Ensure that the boiler is not limited electronically.
- Check the CO content at full load, and compare the actual
2
values with those in the table below.
- Correct the CO adjustment as required using the gas flow
2
adjusting screw on the gas combination valve in accordance
with the table.
After completing servicing, close the front casing
again and fasten the screws tightly. There is a
risk of carbon monoxide poisoning if the flue
system is faulty.
- Turn clockwise - lowers CO
- Turn anti-clockwise - raises CO
Appliance open
at upper load
Natural gas E/H/LL
8.6% ± 0.2%
- Terminate the emissions test mode by returning the temper-
ature selector to its original position.
38
23. CO
2
test instrument into the "flue
2
content
2
content
2
LNG P
10.1% ± 0.2%
adjustments
Fig.: Undoing screws
Fig.: Gas combination valve
Fig.: Emission test with open appliance
Screws
Gas flow adjust-
ing screw
Test port
"Flue gas"
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