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
M ODEL PRESSURE
300 -.085”WC
400 -1.25”WC
500 -1.35”WC
Norm ally Clos ed/
Ope n on a Ris e in
Pr es s ur e
Toler ance +/-.05”WC
LOW GAS PRESSURE
SWITCH
M ODEL PRESSURE
Natur al +4.6”WC
LP +9.0”WC
Norm ally Ope n/
Clos e on a Ris e in
Pr e s s ur e
Tole r ance +/-.05”WC
BLOCKED EXHAUST
PRESSURE SWITCH
M ODEL PRESSURE
300 +1.15”WC
400 +1.39”WC
500 +1.77”WC
Nor m ally Clos e d /
Ope n on a Rise in
Pr es s ur e
Toler ance +/-.05”WC
BLOWER PROVER
PRESSURE SWITCH
M ODEL PRESSURE
300 +1.0”WC
400 +2.5”WC
500 +4.5 'WC
Nor m ally Open / Clos e on
a r is e in Pre s s ur e
Tole r ance +/-.05”WC
