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7
GAS VALVE CALIBRATION
Procedure
b
Gas valve calibration jobs must be done by the
Technical Assistance Centre authorized by
only.
The procedure for calibrating the gas valve is given here
below:
- place the exhaust flue probe of the combustion
analyzer into the socket on the clapet;
- make sure there is demand from the two room
thermostats. In case of problems with starting up
the burner after the ignition cycle, turn the adjusting
screws anti-clockwise by about 1 turn at a time;
- take the burner to maximum power from the control
panel by pressing key "SET/ESC" and
5 secs. This will make it possible to select max. speed
with the
work at the set speed; this will be displayed on the
first digit to the left. H = maximum speed. The other 2
digits will show the flow temperature (e.g.: T1=80°C);
- Adjust combustion by the screws shown in Figure
19 until reaching the rated CO2 value, (see table),
turning the screws clockwise to reduce the value;
- N.B. Turn anti-clockwise to increase the gas flow
capacity and clockwise to reduce it;
- leave the boiler to run regularly at maximum power,
then adjust calibration if necessary;
- take the burner to minimum power, pressing key
- the letter "L" (Low=, the boiler will go to minimum
power) will appear to the left on the display; use the
gas valve offset adjusting screws (see Figure 20) to
reach the ideal values given in the following table.
18
GAS
Natural gas
(par. nr.15). All the fans in the system will
MAX CAPACITY
MIN CAPACITY
CO2 = 8.9 - 9.1
CO2 = 8.9 - 9.1
B
together for
;
Figure 19
Figure 20
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