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ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 28 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
CONTROLS – PRESSURE SWITCHES – SUF 120 through 250
Note: Check the website www.statewaterheaters.com
for Technical Bulletin S023-06 “Air
Pressure Switches” under “Literature/Service Handbooks”
Top View of Pressure Switches
BLOCKED INLET
PRESSURE SWITCH
MODEL PRESSURE
All 0.85”WC
Normally Closed /
Open on a Rise in
Pressure
Tolerance +/-.05”WC
LOW GAS PRESSURE
SWITCH
MODEL PRESSURE
Natural 4.0”WC
LP 8.0”WC
Normally Open / Close
on a Rise in Pressure
Tolerance +/-.05”WC
BLOCKED OUTLET
PRESSURE SWITCH
MODEL SWITCH
120N +1.2”WC
150N +0.98”WC
199N +1.06”WC
250N +4.0”WC
120LP +1.3”WC
150LP +1.3”WC
199LP +4.0”WC
250LP +2.0”WC
Normally Closed /
Open on a Rise in
Pressure
Tolerance +/-.05”WC
BLOWER PROVER
PRESSURE SWITCH
MODEL PRESSURE
All +.075”WC
Normally Open / Close
on a Rise in Pressure
Tolerance +/-.05”WC