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6. ADJUSTEMENT OF THE GAS VALVE
After starting the system, it is not necessary to set the gas valve, it was already done in the factory.
P in
In order to set the gas valve, there are 2 setting screws :
- Ratio screw : for the operation at low capacity
- Offset screw : for the operation at high capacity
Turning on the appliance at its high speed by pressing the servicing button S1 for 10 seconds then
press it again. The display shows alternatively H and b.
Research the appropriate CO
1) Check the CO
2) Then check the CO
After have set the CO
Then go back to low speed to eventually readjust the CO
Repeat these steps until the 2 values are correct.
In the case of AMC 78, 97 and 116 models, check respectively at low and high capacity the 2 heating
units and adjust if necessary.
After this control, the 2 units shall heat together.
In case of replacement, only a qualified person is allowed to set the new gas valve.
An inappropriate setting can cause an overheating, a non-ignition of the burner or the
emission of carbon monoxide.
Use a calibrated combustion analyser and place the probe in the provided hole.
at high speed (High mode).
2
Decrease the CO
by turning the Ratio screw in clockwise (less gas).
2
Increase the CO
by turning the Ratio screw in anticlockwise (more gas).
2
at low speed (Low mode) by pressing twice the S1 button, then press it for
2
10 seconds.
The CO
level at low speed shall be lower than the CO
2
Decrease the CO
by turning the Offset screw in clockwise.
2
Increase the CO
by turning the Offset screw in anticlockwise.
2
at low speed, go back to high speed and readjust the CO
2
Do never forget to check the CO level (carbon monoxyde) of the appliance !!!
Too much CO means mainly that the mix air/gas is to rich.
The CO value has to be always lower than 100 ppm.
P offset
P out
Offset screw
Offset adj.
Ratio screw
Ratio adj.
values in the technical specifications of the table 5.
2
level at high speed.
2
2
level.
2
level.
17
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