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ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 23 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
CONTROLS – GAS VALVE SUF 120
CONTROLS – GAS VALVE SUF 150
The gas control valve on the SUF 120 has a
built i n adj ustable pre ssure regulator. T he
adjustment screw is accessed by removing
the cap screw m arket regulator i n t he
illustration.
Inlet gas pressure may be read at the inlet
pressure tap only if the manual shut off valve
(gas cock) is in the “ON” position. Leaving
the knob in the “OFF” position will not allow
the burner to fire and will generate a fault
code on th e UIM ( Universal I nterface
Module).
The gas control valve on the SUF 150 is has
a built in pressure regulator. The regulator
may be adjusted by removing the cap screw
marked “regulator” in the illustration.
Inlet gas pressure may be read at the inlet
pressure tap only if the manual switch is set
the “ON” position.