Wolf CGB-75 Instructions Manual page 68

B) CO adjustment at the lower load - soft start
2
- Remove the protective screw from the zero point adjusting
screw with a Torx screwdriver.
- Restart the condensing boiler by pressing the "Reset but-
ton".
- Check and correct (if required) the CO
after the burner start with the CO
the zero point adjusting screw with Torx in accordance with
the table. This adjustment must be made within 180 s after
the burner start. If necessary, press "Reset" to repeat the
start phase for the adjustment.
- During this adjustment, there must be no DHW operation!
- turn clockwise - higher CO
- turn anti-clockwise - lower CO
Appliance open
at lower load
Natural gas H
8.5% ± 0.2%
- Tighten the protective screw again
C) Checking the CO adjustment
2
- After completing the work, refit the casing cover and check
the CO value with the boiler closed
2
Observe the CO emissions whilst making CO
adjustments. The gas combination valve is in-
correctly adjusted if the CO value is > 300 ppm
when the CO value is correct. Take the following
2
steps:
- Fully insert the zero point adjusting screw
- Open the zero point adjusting screw 1½ revolutions
- Repeat the adjusting process from section A)
- The condensing boiler is correctly adjusted when the CO
values correspond to those in the adjacent table
D) Completing the adjustments
- Shut down the boiler and close the test ports and hose
connection nipples again. Check the gas supply line and
hydraulics for leaks.
68
CO adjustment
2
content approx. 20 s
2
tester, by fine adjusting
2
content
2
content
2
LPG P
9.7% ± 0.2%
Zero point
adjusting screw
Protective screw
Figure: Gas combination valve
2
2
Figure: Flue gas test with a closed boiler
Natural gas H
8.8% ± 0.5%
Natural gas H
8.7% ± 0.5%
Gas flow
adjusting
screw (only for
natural gas)
Test port
"Flue gas"
Appliance closed
at upper load
LPG P
10.3% ± 0.5%
Appliance closed
at lower load
LPG P
9.9% ± 0.5%
3061741_201712.indd