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UNIT HEATER
10.3 Gas Valves - Automatic Ignition
There are three type of valve used for this range of heaters (see Data Tables in Section 2 for part
numbers and specification numbers).
CUH.../A 60 to 140 use the S.I.T. Tandem gas valve.
Note: Model CUH.../A 60 heaters only cannot be operated on L.P.G.
CUH.../A 160 to 300 use the S.I.T. Nova gas valve.
CUH.../A 340 to 380 use the Johnson multifunction gas valve.
10.3.1 Tandem Range Valves
Tandem range main gas valves cannot be converted between gasses as they are constructed either with
or without a governor. These valves must be changed for the correct type as listed in the data tables.
10.3.2 Nova Range Valves
Nova range main valves may be converted to operate with or without a burner gas pressure regulator.
Follow the instructions in Section 7 of this manual for removal of gas valves.
To convert Nova valve from Natural Gas to L.P.G. (see Fig 10.2)
i) Remove the cover of the pressure regulator.
ii) Completely unscrew the regulator adjusting screw and remove it complete with its spring.
iii) Replace the adjusting screw and original cover with the blanking nut attachment.
This device screws fully into the body of the regulator until it stops and puts the regulator out of action.
The step opening feature of the main valve will still operate.
To Convert Nova Valve from L.P.G. to Natural Gas
Reverse the instructions above.
Blanking screw Governor spring
For L.P.G. assembly
The valve shown is the Nova manual
ignition version, however conversion
of the automatic ignition version is
exactly the same.
Fig 10.2 Conversion of Nova Family Valve
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