CYCLONE Xi COMMERCIAL GAS WATER HEATER
BTH 120 thru 500 SERVICE HANDBOOK
A.O. Smith – Technical Training Department 27 Ashl
and City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 316586-000
CONTROLS – GAS VALVE BTH 120
CONTROLS – GAS VALVE BTH 150
The gas control valve on the BTH 120 has a
built in adjustable pressure regulator. The
adjustment screw is accessed by removing
the cap screw market regulator in the
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 the UIM (Universal Interface
Module).
The gas control valve on the BTH 150 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
to the “ON” position.
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