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UNIT HEATER
Section 10. Conversion Between Gasses
10.1 General
Note all versions of models CUH...60 may not be operated on L.P.G
All versions of the heaters use the same main burner bars and pilot burners.
Natural gas
All natural gas versions use the same main burner injectors, marked 840, and pilot injectors marked
34.
The gas valves vary according to the models size and method of control i.e. manual or automatic
ignition but in all cases the valve contains a gas pressure regulator to allow for setting of the burner
pressure.
L.P.G.
All L.P.G. versions use the same main burner injector, marked 250, and pilot injectors marked 19.
The gas valves vary according to the models size and method of control i.e. manual or automatic
ignition but in all cases the valve DOES NOT contain a gas pressure regulator.
The correct operation of the heater depends on the close control of the gas inlet pressure to the appliance.
10.2 Burner Conversion
To convert the burner assembly from one gas to the other is the same for all types of heater.
i) Remove the burner tray as in Section 7 of these instructions and remove all of the main burner
injectors.
ii) Replace with the ones for the new gas.
iii) Remove the pilot burner assembly retaining the flame monitor, and spark electrode.
iv) Fit the new pilot burner injector following the instructions in Section 7.
Fig 10.1 Pilot Burner Options
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