19
FIRST OPERATING
Figure 25
7. 2 Gas valve calibration
9
Gas valve calibration jobs must be done by the Technical As-
sistance Service authorized by
R only.
The procedure for calibrating the gas valve is given here below:
− place the exhaust ue probe of the combustion analyzer
into the socket on the clapet;
− make sure there is demand from the two room thermo-
stats. In case of problems with starting up the burner
after the ignition cycle, turn the adjusting screws an-
ti-clockwise by about 1 turn at a time;
− take the burner to maximum power from the control
panel by pressing key ”SET/ESC” and
together for 5
secs. This will make it possible to select max. speed with
the
(par. nr.15). All the fans in the system will work at
the set speed; this will be displayed on the rst digit to
the left. H = maximum speed. The other 2 digits will show
the ow temperature (e.g.: T1=80°C);
− Adjust combustion by the screws shown in Figure 26 un-
til reaching the rated CO2 value, (see table), turning the
screws clockwise to reduce the value;
− N.B. Turn anti-clockwise to increase the gas ow 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 pow-
er) will appear to the left on the display; use the gas valve
offset adjusting screws (see Figure 27) to reach the ideal
values given in the following table.
GAS MAX CAPACITY MIN CAPACITY
Natural gas CO2 = 8.9 - 9.1 CO2 = 8.9 - 9.1
Figure 26
Figure 27
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