Controls - Pressure Switches - Bth 120 Through 250 - A.O. Smith Cyclone Xi Service Handbook

CONTROLS – PRESSURE SWITCHES – BTH 120 through 250
BLOCKED INLET
PRESSURE SWITCH
M ODEL PRESSURE
All -0.85"WC
Norm ally Clos ed /
Ope n on a fall in
Pre s sure
Tole rance +/-.05"WC
Note: Check the website
Switches" under "Literature/Technical Bulletins"
A.O. Smith – Technical Training Department
CYCLONE Xi COMMERCIAL GAS WATER HEATER
BTH 120 thru 500 SERVICE HANDBOOK
LOW GAS PRESSURE
SWITCH
MODEL
Natural
LP
Norm ally Ope n / Close
on a Ris e in Pre s s ure
Tole rance +/-.05"WC
Top View of Pressure Switches
www.hotwater.com
Servicing should only be performed by a Qualified Service Agent
BLOWER PROVER
PRESSURE SWITCH
M ODEL
PRESSURE
All
4.0"WC
8.0"WC
Norm ally Ope n / Clos e
on a Ris e in Pre s s ure
Tole rance +/-.05"WC
for Technical Bulletin A023-06 "Air Pressure
33
BLOCKED OUTLET
PRESSURE SWITCH
MODEL
PRESSURE
120N
+0.75"WC
150N
199N
250N
120LP
150LP
199LP
250LP
Norm ally Clos e d /
Open on a Ris e in
Pre s sure
Tole rance +/-.05"WC
Ashland City, Tennessee © 2009
SWITCH
+1.2"WC
+0.98"WC
+1.06"WC
+4.0"WC
+1.3"WC
+1.3"WC
+4.0"WC
+2.0"WC
316586-000