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ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 26 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
CONTROLS – GAS VALVE , ORIFICE CHART– SUF300,400,
The gas control valve has a bu ilt in field
adjustable pressure regulator. The regulator
may be adjusted by removing the cap screw
marked “regulator”. The adjustment screw is
underneath. The g as val ve for the SUF
Natural gas model is shown above. This is
a 24V. solenoid operated gas valve.
Refer to the replacement parts information at
the back of this manual for part numbers for
Natural and LP gas valves for all SUF 300,
400, and models.
ORIFICE CHART – SUF 300,400,
Model 300 400
Natural .27 4” .314”
LP .189” .219”
24V
Solenoid
connection
Low Gas
Pressure
Switch
Manual Gas
Control Knob