Gas Conversion Methods - Baxi Mainfour 240 F Manual Para El Usuario

The authorised Technical Assistance Service can convert this boiler to
natural gas (G20) or liquid gas (G31).
Carry out the following operations:
A) replace the main burner nozzles;
B) Change parameter on electronic board
C) new max. and min. calibration of the pressure regulator.
A) Replace the burner injectors
• carefully pull the main burner off its seat;
• replace the main burner injectors making sure to fully tighten them to
prevent gas leaks. Injector diameters are specified in table 1.
B) Change parameters on electronic board
• set parameters F02, F08, F09, F10, F16 according to the gas used, as
described in section 21;
C) Calibrate the pressure regulator (Figure 10)
• connect the positive pressure test point of a differential pressure gauge (possibly water-operated) to the gas valve pres-
sure test point (Pb). Only for models with sealed chambers, connect the negative pressure test point of the pressure
gauge to a "T" fitting in order to join the boiler adjustment outlet, the gas valve adjustment outlet (Pc) and the pressure
gauge. (The same measurement can be made by connecting the pressure gauge to the pressure test point (Pb) after
removing the front panel of the sealed chamber). Measuring burner pressure using methods other than those described
could lead to incorrect results as the low pressure created by the fan in the sealed chamber would not be taken into
account.
To simplify calibration of the gas valve, the calibration
function may be set directly on the boiler control panel
as follows:
a) hold down the buttons
least 6 seconds;
b) after about 6 seconds, the symbols
c) the display shows, at intervals of one second, "100" and
the flow temperature.
In this phase, the boiler works at the maximum heating
output (100%).
d) press +/- to immediately set the power of the boiler
(100% or 0%);
e) adjust the "Pmax/Pmin" screw (figure 10) to set the
burner pressure value as described in table 1.
f) press +/- to gradually set the desired power level (interval = 1%).
Press the button to leave the function.
Note:
The function is automatically deactivated after a period of 15 minutes, at the end of which the electronic board returns to
its operating status prior to the activation of the function or prior to reaching the set maximum temperature.
INSTRUCTIONS FOR FITTERS
19. GAS CONVERSION
19.1 GAS VALVE CALIBRATION FUNCTION
and together for at
flash;
14
Figure 10
926.527.2 - EN