Conversion To Lpg - andrews MAXXflo EVO CWH 90/302 Installation And Maintenance Manual

5.3 CONVERSION FROM SECOND FAMILy (NATuRAL GAS - G20) TO
THIRD FAMILy OF GASES (PROPANE - G31)
This water heater is supplied from the factory already set up for G20 Natural Gas, but each heater can be
converted on site to operate on Liquefied Propane Gas (G31).
CAuTION
This conversion must be carried out by a competent qualified person using only the parts provided
by the manufacturer.
Before work commences turn off the Mains Electricity and Gas Supply to the heater.
achieved by following these instructions, and must be carried out to all heat exchangers.
• Remove the throttle adjustment screw cover
• Compress the spring clip holding the black air intake hose onto the venturi and remove the hose
• Undo and remove the 5 screws securing the venturi to the gas valve and fan
• Remove the venturi completely and if you can, do not disturb the cork gasket if it is stuck to one of the two
metal surfaces (this will be helpful during re-assembly)
• Check the size of the LPG orifice is correct (refer to table overleaf) and fit the orifice into the rubber seal that
is located in the outlet of the gas valve (see illustrations below)
GAS VALVE
• Before re-assembly examine the condition of the cork gasket and replace if it is damaged
• Re-assemble the venturi between the fan and gas valve and secure onto the fan using the 2 screws
Commissioning
Air intake hose
Spring Clip
SET FOR NG
46
The conversion can then be
5 x Venturi screws
Orifice should be seated flush
with the body of the valve
LPG ORIFICE
SET FOR LPG
MAXXflo EVO