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ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 29 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
CONTROLS – PRESSURE SWITCHES – SUF 300,400,
Note: Check the website www.statewaterheaters.com
for Technical Bulletin S023-06 “Air
Pressure Switches” under “Literature/Service Handbooks”
Top View of Pressure Switches
SUF 300,400,
BLOCKED INLET
PRESSURE SWITCH
MODEL PRESSURE
300 -.085”WC
400 -1.25”WC
500 -1.35”WC
Normally Closed/
Open on a Rise in
Pressure
Tolerance +/-.05”WC
LOW GAS PRESSURE
SWITCH
MODEL PRESSURE
Natural +4.6”WC
LP +9.0”WC
Normally Open/
Close on a Rise in
Pressure
Tolerance +/-.05”WC
BLOCKED EXHAUST
PRESSURE SWITCH
MODEL PRESSURE
300 +1.15”WC
400 +1.39”WC
500 +1.77”WC
Normally Closed /
Open on a Rise in
Pressure
Tolerance +/-.05”WC
BLOWER PROVER
PRESSURE SWITCH
MODEL PRESSURE
300 +1.0”WC
400 +2.5”WC
500 +4.5 'WC
Normally Open / Close on
a rise in Pressure
Tolerance +/-.05”WC