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CO
2
adjustment
Adjusting the gas:air connection
Carry out the adjustments in the following order: At the factory, the gas combination valve has been adjusted for
the gas type stated 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.
NB
A) CO
2
adjustment at the upper load (emissions test
mode) for natural gas
- Pivot the control unit flap down.
Unlock the casing cover with the l.h. and r.h. turnbuckles.
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
2
tester into the "Flue 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
2
content at full load, and compare the actual
values with those in the table below.
- Correct the CO
2
adjustment (if required) using the gas flow
adjusting screw on the gas combination valve in accordance
with the table.
Figure: Opening the turnbuckle
l.h. turnbuckle
r.h. turnbuckle
Gas flow adjusting
screw
(only for natural
gas)
Figure: Gas combination valve
- Terminate the emissions test mode by turning the tempera
-
ture selector back into its original position.
- turn clockwise - lowers CO
2
content
- turn anti-clockwise - raises CO
2
content
Figure: Flue gas test with an open boiler
Test port
"Flue gas"
The upper load cannot be adjusted for LPG.
Appliance open
at
upper
load
Natural gas H
8.6% ± 0.2%
LPG P (check)
10.1% ± 0.2%
Summary of Contents for CGB-100
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