52
3044826_201403
Service Manual
- Restart the boiler by pressing the „Reset button“.
- Check and correct (if required) the CO
2
content approx. 20
s after burner start with the CO
2
meter, by fine adjusting
the zero point adjusting screw in accordance with the table
below. Make this adjustment within 120 s after burner start.
If necessary, repeat the start phase for setting purposes by
pressing the „Reset button“.
-
Turn clockwise
-
higher CO
2
content.
-
Turn anti-clockwise
-
lower CO
2
content.
B) CO
2
adjustment at the lower load (soft start)
Fig.: Gas combination valve
Zero point adju-
sting screw
- Switch the boiler OFF and close the test ports and hose
nipple; check for leaks.
D) Completing the adjustments
C) Checking the CO
2
adjustment
- After completing the work, refit the casing lid and check the
CO
2
value with the boiler closed.
During the initial start-up, the EC emissions can reach
200 ppm for the first hours, as binding agents from
the insulation combust.
Observe the CO emissions whilst making CO
2
ad-
justments. The gas combination valve is incorrectly
adjusted, if the CO value lies >200ppm, when the
CO
2
value is correct. In that case, take the following
steps::
- Fully insert the zero point adjusting screw
- open the zero point adjusting screw 3 revolutions for natural
gas, and 2 revolutions for LPG.
- Repeat the adjusting process from section A).
- The boiler is correctly adjusted, when the CO
2
value corre-
sponds with those in the adjacent table.
NB
CGB / CGB-K
boiler open
at
lower
load
Natural gas H
8,8% ± 0,2%
LPG P
10,8% ± 0,5%
CGB / CGB-K
boiler closed
at
lower
load
Natural gas H
9,0% ± 0,2%
LPG P
11,1% ± 0,5%
CGB / CGB-K
boiler closed
at
upper
load
Natural gas H
9,0% ± 0,2%
LPG P
10,1% ± 0,3%
Fig.: Flue gas test with a closed boiler
Test port „Flue gas“
