TECHNICAL ASSISTANCE CENTRE
55
CONVERSION FROM ONE TYPE OF GAS TO ANOTHER
The ALU PRO power boilers are supplied to operate
with G20 (methane gas). They can, however, be con-
verted to operate with G25 or G31 using the relative Kit
supplied.
b Contact the r Technical Assistance Centre.
Before carrying out the conversion:
- Switch off the electricity supply setting the system's
main switch and that of the control panel to "off"
- Close the gas shut-off tap
- Remove the top panel
- Disconnect the line gas valve
- With a TORX wrench unscrew the screws (3) and free
the gas valve (1) from the venturi pipe unit (2)
- Replace the diaphragm (4), fitted on the gas valve, with
the one supplied with the kit, whose diameter is shown
in the table below.
- Put back the gas valve and carry out all the calibration
operations described in the section “Setting the com-
bustion parameters” on page 51.
b After installing the kit, check the seals on all connec-
tions made.
b The pressures to have on the gas network are
shown in the table below.
b Conversions should only be carried out by the
r Technical Assistance Centre or by authorised
personnel, even when the boiler has already been
installed.
b On completion of the conversion, adjust the boil-
er again following the instructions given in the
“Calibrating combustion parameters” section”.
1
2
4
3
NOMINAL gas feeding pressures
G20
20 mbar
G25
25 mbar
G31
37 mbar
MINIMUM gas feeding pressure
G20
13 mbar
DIAPHRAGM diameter (Ø)
G20
7.7
G25
NO (not present)
G31
5.8
b THIS CHAPTER IS NOT VALID FOR COUNTRIES WHERE IT IS NOT POSSIBLE TO CARRY OUT THIS TYPE OF
CONVERSION.
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