Technical assistance and maintenance
Ed. 04/2007
35
SECTION 5: TECHNICAL ASSISTANCE AND MAINTENANCE
In this section you will find all the indications necessary for service technicians to carry out
regulation of the gas valve and change of gas type, as well as some indications regarding
maintenance.
5.1 HOW TO REGULATE THE GAS VALVE
For the proper operation of the M C series heaters, the calibration values of the gas valve
must be the same as those given in Table 9 or in Table 10.The appliance leaves the
factory with the gas valve already calibrated. If regulation is necessary, proceed as
follows.
Regulation of the gas valve must be carried out by
professionally qualified
personnel
.
OPERATION WITH NATURAL GAS
You will need:
the heater installed and connected to the power and gas supply.
1.
Connect a pressure gauge to the pressure intake P1 (see Figure 26).
2.
Switch on the heater.
3.
Remove the protective cover and turn the adjustment screw (see A in Figure 24 or B
in Figure 25) clockwise to increase pressure or anticlockwise to reduce it, until the
pressure indicated in Table 9 is reached.
4.
Switch the heater off and on and check that the pressure to the burner has
stabilised. If necessary adjust it again.
5.
In the case of M 60 C heaters, proceed with regulation of soft opening (see
“REGULATION OF SOFT OPENING (FOR M 60 C HEATERS)”.
)
After regulation has been completed, the adjustment screw of the gas valve must be
sealed.
PRESSURES AT THE BURNER OF SERIES M C APPLIANCES FUELLED BY NATURAL GAS (G20)
(GAS SUPPLY PRESSURE 20 mbar)
M 20 C
M 30 C
M 60 C
PRESSURE at the BURNER
(mbar)
(mmH
2
O)
11.8
120
7.8
80
8.0
82
Table 9
– Pressures at the burners for M C series appliances fuelled by natural gas (G20)
