White Rodgers 770-1 Dual Purpose Air Switch Catalog Page
Electrical Ratings
Model
Adjustable
Switch
Resistive (Non-Inductive)
Number
Operating Range
Action
120 VAC
240 VAC
277 VAC 125-277 VAC
770-1
0.05 to 12.0 W.C.
SPDT
15.0A
15.0A
15.0A
300 VA
770-3
0.05 to 12.0 W.C.
SPDT
15.0A
15.0A
15.0A
300 VA
DUAL PURPOSE AIR SWITCH
Responds to Positive, Negative or Differential Air Pressure
FEATURES
•Designeliminates“fluttering”ormalfunctionduetoshockorvibrationnormally
encountered with “sail switches.”
•Wideoperatingrange.
•Furnishedwithone12” piece 1/4”O.D.flexibletubing,nutsandferrules.
•Canbemountedinanypositionexceptupsidedown.
•Encloseddiaphragm.
SPECIFICATIONS
Ambient Temperature . . . . . . . . . . . . . . . . -40 to +180°F
Maximum Pressure. . . . . . . . . . . . . . . . . . 1/2 PSI
Agency . . . . . . . . . . . . . . . . . . . . . . . . . . . U.L. listed and C.S.A. approved
1
/2 HP @ 125 VAC
770-1
AIR SWITCH APPLICATIONS
ELECTRONIC AIR CLEANERS
Switch permits power to cleaner whenever
blower of system is operating.
PROCESS DRYING
Switch monitors negative pressure to stop
conveyor or process and provides alarm
signalonfanfailure.Idealforbulk
chemicals, food processing, grain drying.
POWER HUMIDIFIERS
Switch permits unit to operate whenever
there is proper air movement.
NATURAL DRAFT BURNERS
Switchsignalsinsufficientdraft,provides
safetylimittostopfiringonlackofdraft,
startsagainonsufficientdraft.
REFRIGERATION EQUIPMENT
Switch responds to pressure drop across
refrigeration coils to signal alarm condition
or automatically initiate or terminate
defrost cycle.
INDUCED DRAFT BURNERS
Proves operation of I.D. fan by sampling
draftorairflow.Shutsofffiringequipment
on fan failure.
DUCT STRIP HEATERS
Switch proves air movement across
heaters by positive pressure to prevent
burn-outoninsufficientairflow.
DUAL PURPOSE
AIR SWITCH
Indicates Canadian Model Number: call 1-800-305-6953 to order
www.white-rodgers.com
72
HEA
TING
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