35
GB
Combustion check at full load
Start
the
boiler
in
controller
stop mode and go to 50% load.
Now the boiler operates at 50%
load. Allow the boiler to stabili-
ze the combustion for 3 minutes.
Then increase the boiler load step
by step up to 100%. Check the gas
pressure on the inlet of the gas valve
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gas pressure should never go below
the minimum required value
ĺ
see
technical data
. When an (optional)
minimum gas pressure switch is
connected, this must be set to
75% of the required gas pressure.
Check the combustion settings via
the test point in the chimney con-
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settings with the small adjustment
screw at the top of the gas valve (2).
Combustion check at minimum load.
Switch the boiler to minimum load
(0%).
Check the combustion settings
the same way as described for full
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-
tings with the large adjustment
screw at the top of the gas valve (3).
Combustion check at 50% load
An additional reference check of
combustion values at 50% load is
recommended in order to check if the
gas valve is set in such way, that the
modulating behaviour is normal. The
CO
2
value should be in between the
settings of full load and minumum
load. CO value should be equal to
full load and minimum load values.
Make sure that the boiler is set to
automatic operation and control-
ler stop mode is disabled after
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2
3
Commissioning
Combustion check
Combustion settings
1
+
-
-
+
SW 2
SW 3
Combustion settings max. load
for natural gas G20 / G25
R40 45-155
CO
2
max
%
± 0.2
Combustion settings min. load
for natural gas G20 / G25
R40 45-155
CO
2
min
%
± 0.2
