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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

770 SERIES DUAL PURPOSE AIR SWITCH

Responds to Positive, Negative or Differential Air Pressure

FEATURES

• Design eliminates “fluttering” or malfunction due to shock or vibration normally

encountered with “sail switches”.

• Wide operating range.

• Furnished with one 12

piece

1

/

4

O.D. flexible tubing, nuts and ferrules.

• Can be mounted in any position except upside down.

• Enclosed diaphragm.

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

signal on fan failure. Ideal for bulk

chemicals, food processing, grain drying.

POWER HUMIDIFIERS

Switch permits unit to operate whenever

there is proper air movement.

NATURAL DRAFT BURNERS

Switch signals insufficient draft, provides

safety limit to stop firing on lack of draft,

starts again on sufficient draft.

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

draft or air flow. Shuts off firing equipment

on fan failure.

DUCT STRIP HEATERS

Switch proves air movement across

heaters by positive pressure to prevent

burn-out on insufficient air flow.

DUAL PURPOSE

AIR SWITCH

Indicates Canadian Model Number: call 1-800-305-6953 to order

www.white-rodgers.com

76

HEATING