Technical data

52
4.5 CONVERSION TO DIFFERENT GASES
The boilers are supplied to work with one of the following gas supply
systems:
2H and 2E categories using reference gas G20 (Methane) at a supply
pressure of 20 mbar.
3 P category using reference gas G31 (Propane) at a supply pressure
of 37 mbar.
3+ category using either G31 (Propane) at a supply pressure of 37 mbar
or G30 (Butane) at a supply pressure of 29 mbar.
3 B/P category using either G31 (Propane) or G30 (Butane) at a supply
pressure of 29 mbar.
(The adjustment of the appliance is identical for systems 3P, 3+ and 3
B/P with the appliance governor out of action and the inlet pressure is
controlled by the supply regulator).
In case a mixed gas is intended for use, the boiler must be regarded as
G30 for conversion process and use.
To adapt the boiler so as to work with a different gas within the above
gas types:
1) Check type of the gas to be used. The conversion is only allowed to
the above-explained gases.
2) Remove the burner (see ‘Servicing section) to replace the injectors
on the burner manifold. Use a suitable socket driver to unscrew the
injectors from the burner manifold. Select the correct injector size for
the new gas (according to ‘Table 1’), obtain new injectors and check
if they are free from dust and dirt, and assemble the new injectors
using new joint rings.
3) Adjust the minimum and maximum outlet pressures of the boiler gas
valve to the correct value given in Tab.1 for that type of gas. Adjust-
ment of pressure is explained in “Commissioning” section in detail.
4) Elektronic Board should also be adjusted. For this go to ‘PARAM-
ETERS’ ADJUSTMENT’ part.
5) Check if the gas supply pressure to the boiler is correct for the type of
gas to be used.