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2.6 Conversion to another gas
Important: Install a gas valve suitable for the type of
gas to be used.
If the water heater has to function on a gas category (LP
or natural gas) other than the gas set as standard (ex
works), the water heater must be converted to the
applicable gas category with the associated conversion
kit(s).
Only an accredited installer may convert the heater.
All the injectors of the main burner bars and the injector
of the ignition pilot must be replaced.
Regurlary natural gas units do have a burner pressure
regulator, but LP-gas units do not.
The burner pressure regulator on the gas control must
be removed when converting the heater for use on LP-
gas (if present).
The burner pressure regulator must be fitted on the gas
control when converting to natural gas (if required)
The table with technical data shows which injectors
must be fitted for the gas category in question.
Procedure:
1. Shut the water heater down; close the main inlet
gas valve and switch of the electricity supply at the
main switch;
2. Remove the burner tray including the gas valve:
a. remove the screws of the burner tray housing,
b. loosen the wiring of ingition and ionisation pen
on the burner controller,
c. loosen the gas control cable,
d. dismount the gas supply to the gas valve;
3. Remove the burner tray from underneath the heater;
4. Replace the main injectors and the injector of the
ignition burner. Use the table with technical data to
check that the diameter of the injectors is correct;
5.
Converting from natural gas to LP-gas:
a. remove the burner pressure regulator on the
gas control,
b. mount the flat covering plate with sealing
provided in the conversion kit,
c. see figure 15;
Converting from LP-gas to natural gas:
a. remove the flat covering plate with sealing on the
gas control,
b. mount the burner pressure regulator on the gas
valve,
c. See figure 16;
6. Mount the burner tray;
7. Reconnect the wiring and gas supply to the gas
valve;
8. Open the main inlet gasvalve;
9. Check the gas inlet pressure;
10. Switch on the electricity supply at the main switch;
11. Commision the water heater;
12. Adjust the burner pressure to the value as indicated
in the technical data;
13. Check the soundness;
14. Check the operation of the heater;
15. Fix the conversion sticker from the conversion kit
below the rating plate to the heater, so that is clear
on which gas category the heater operates.
AOS 0546
AOS 547
Figure 15 - mounting covering plate with sealing on the
gas valve
Figure 16 - mounting burner pressure regulator on the
gas valve,