Product Overview

C76
UNI-LINE FACTORY SET POINT
ORDER NO. NO. SWITCH RANGE COMMENTS
2374-410 AFS-222 SPDT (N.C.) .05" TO 12.0" WC *
2374-411 AFS-460 SPST (N.C.) .05" TO 12.0" WC MANUAL
RESET
MODEL
2374-412 AFS-262 SPDT (N.C.) .05" TO 2.0" WC
*Replaces White-Rodgers 770-1, Cemco Ritt 3, Dayton 2E462, Johnson
P32 series & Landis G4R 141-0518 & 141-0575 switches.
DIFFERENTIAL PRESSURE SWITCHES
UNI-LINE SET POINT
ORDER NO. RANGE SWITCH
2374-495 .25 TO 1.0" W.C.
2374-498 1.0 TO 4.0" W.C.
2374SERIES AIR SWITCHES
The 2374 Series Differential Pressure Switches are sensitive and reliable
devices for remotely sensing the operation of fans and blowers associated with
ducted ventilation systems. They can also be used for sensing static pressure
drop across filters.
Pressure differentials as small as .05" W.C. are sufficient to actuate the con-
tacts which in turn, operate various devices including electronic air cleaners,
remote status indicators, alarms and control circuits.
The switches are field adjustable and are relatively insensitive to temperature
change. They may be used to sense positive, negative or differential air pressure.
Electrical rating 300 VA @ 115/277 VAC pilot duty
15 amps noninductive to 277 VAC
Control set point field adjustable
Differential ±.02 W.C. with a slight increase
at higher operating pressures
Maximum pressure .5 psig
Operating position diaphragm vertical
Conduit opening 7/8" dia. for 1/2" conduit
Electrical connections screw terminals with cup washers
Pressure sampling line
connections 1/4" O.D. rigid or semirigid tubing
Ambient temperature limits –40°F to 180°F
2374-410
2374-411
2374
SERIES ADJUSTABLE
AIR SENSING SWITCHES
The new 2374 Series Adjustable Air Sensing Switches are designed to
replace a wide variety of air-sensing switches found in residential and light
commercial applications including - furnaces, electronic air cleaners and
humidifiers. Two models are currently available with an adjustable range of
.2" W.C. to 1.0" W.C. or 1.0" W.C. to 4.0" W.C. Both models are provided
with an SPDT switch that can be actuated by positive or negative pressure,
or by pressure differential.
Highly accurate, these switches are practically insensitive to temperature
change with an operating temperature range of –40°F to 190°F (–40° to
88°C). They are U.L. and C.S.A. approved for aftermarket applications.
Each switch is provided with mounting hardware and an adjustment tool for
easy installation and calibration.
Electrical rating 5 amp noninductive 120-277 VAC
5 amp noninductive 28 VDC
1 amp pilot duty 120 VA
Control set point field adjustable (see order chart)
Maximum pressure .5 PSI
Ambient temperature –40°F to 190°F (–40° to 88°C)
Operating (mounting position) diaphragm vertical
Switch SPDT
Electrical connections 1/4" spade
Air sample line connectors will accept 1/8", 1/4" or 3/8" tubing
2374-495
SPDT
File No. MH6213 File No. LR18754
Agency Approvals
SPECIFICATIONS
ORDERING DATA
ORDERING DATA
SPECIFICATIONS