Instruction manual BFM 39
is
4 Conversion to a
different gas category
Caution
The conversion may only by carried out by an authorised installation
engineer.
If the appliance must operate on a family of gases (LP gas or natural gas) or
other gas category than that for which the appliance has been set at the
factory, the appliance will have be adapted using a special conversion kit.
Caution
You must check the supply pressure and burner pressure once the
conversion is complete.
4.1 Conversion
1. Isolate (10.3 "Isolating the appliance from the mains") the water heater from
the power supply.
2. Shut off the gas supply.
3. Referring to the gas table (3.4.3 "Gas data"), determine whether the pilot
flame orifice for the intended gas category is different from the one that is
currently fitted. If so, replace (4.2 "Orifice replacement") it.
Note
The current gas category is stated on the type plate.
4. Referring to the gas table (3.4.3 "Gas data"), determine whether the main
orifice for the intended gas category is different from the one that is currently
fitted. If so, replace (4.2 "Orifice replacement") it.
5. Referring to the gas table (3.4.3 "Gas data"), determine whether the use of
a blank plate or burner pressure regulator is required for the intended gas
category. If this is different than for the current gas category,
exchange (4.3 "Replacement of burner pressure regulator or blank plate
BFM30-50-80-100") it.
6. Referring to the gas table (3.4.3 "Gas data"), determine whether the supply
pressure and burner pressure for the intended gas category correspond with
those for the current gas category, and adjust (3.11 "Checking the supply
pressure and burner pressure") these if necessary.
