© MHG Heating Ltd
MHG Heating Ltd, Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey, KT20 5LR
P:0845 6448802 F:0845 6448803 E:
W: www.mhgheating.co.uk
010617
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15.3 Conversion of the Appliance to Operate on LPG (G31).
Unless specified at the time of ordering the appliance/s will be supplied ready to operate
on a Natural Gas (G20) fuel supply.
The appliances data badge will indicate the type of fuel gas the modules have been set to
operate with.
Prior to firing the unit for the first time it is advisable to check the size of the gas injector
of each module. The injectors are located on the outlet of module gas valves.
The table above indicates the size of injector for the respective fuel gas.
If the unit is required to operate on a fuel gas different from that to which it is currently
set, the following conversion procedure must be undertaken.
Isolate the fuel and electrical supplies at the appliances or module isolator.
Disconnect the electrical connection for the gas valves solenoid coils.
Disconnect the gas valve from the yellow gas supply tubing at the union immediately
prior to the gas valves inlet.
Remove the ‘Circlip’ located at the outlet of the valve securing the injector to the fan inlet
elbow.
Extract the gas valve and injector from the fan inlet elbow.Noting the orientation of the
injector with regards to the flow of combustion air/gas into the modules burner.
Install the correctly sized injector into the outlet of the gas valve ensuring to apply the
sealing washer.
A ‘Gas Flow Direction Arrow’ has been marked on the injector to ensure the injector is
installed in the correct position/orientation.
Reinstall the gas valve/s complete with correct sized injector/s in the reverse order.
Following completion of the re-injectoring of all modules the units will require
recommissioning as detailed in section 15.2.
