Beretta Power Plus Box 1002 P INT, Руководство по установке, Страница: 19 / 44

19
Figure 25
7 .2 Gas valve calibration
b
Gas valve calibration jobs must be done by the Tech-
nical Assistance Centre authorized by
B
only.
The procedure for calibrating the gas valve is given here
below:
- place the exhaust flue probe of the combustion ana-
lyzer 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
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 26
until reaching the rated CO2 value, (see table), turn-
ing the screws clockwise to reduce the value;
-
N.B.
Turn anti-clockwise to increase the gas flow ca-
pacity 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 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