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UNIT HEATER
Note: At the first firing of the heater it may be necessary to repeat several times whilst purging the
remaining air from the gas train.
There is no adjustment for the start gas burner.
Once the start gas flame has ignited it will be monitored by the flame probe and should remain on until
the controls turn it off.
Turn off the burner at the external control and refit the electrical plug/s to the main gas valve.
Inlet Pressure
Step Opening
adjustment
Electrical connection
Fig. 4.1 S.I.T. Tandem 0.830.033 Gas Valve (Natural gas)
0.830.020 valve (L.P.G)
Burner Pressure
Regulator adjusting screw under cover.
(Note: on L.P.G. heaters this is a throughput adjuster
and must be fully open )
Gas Outlet
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