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34
AST 14 C 258/00
4.3 GAS CONVERSION
Our boilers are manufactured to run on the type of gas (natural gas or propane) specified
on the purchase order. Subsequent conversion requires the intervention of a qualified
service engineer.
Gas conversion procedure.
First disconnect the boiler from the power supply, and the turn off the main gas
cock.
Remove the front panel of combustion chamber.
Remove the intake pipe.
Disconnect the gas pipe from the mixer.
Unscrew the three socket head screws and remove the mixer.
Take the mixer apart (see diagram).
Remove the two burner nozzles using a 6mm Allen wrench.
Mount the new nozzles and screw them in but do not overtighten.
IMPORTANT. If the nozzle jiggles in the its
seat, it means the thread is damaged, so the
whole mixer needs to be replaced to
guarantee a perfect seal.
Refit all components, taking care not to
damage the seals.
Power on the boiler and open the gas cock.
Call up the parameter setting page, and enter as the P0 parameter the value
corresponding to the power rating and type of gas used (refer to the illustrated
sequence under Changing the TECHNICAL parameters on page 41).
Check parameters P4, P5, P6 and P7 (refer to the table on page 43) referring to
the gas used, and change them if necessary, following the same procedure.
Now you can adjust the gas valve (see 4.1 on page 37).
Output
Diameter [mm]
Natural gas
LPG
12 kW
3.05 2.5
24 kW
3.7 3.0
28 kW
4.0 3.3
