Submittal Sheet

® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
SPECIFICATION DATA
63-1143-1
C7400A
Solid State Enthalpy Sensor
APPLICATION
The C7400A Solid State Enthalpy Sensor is used with the
W7459 Solid State Economizer Control Package. It permits
the use of outdoor air as the first stage of cooling in heating,
ventilating and air conditioning (HVAC) systems.
FEATURES
• Senses and combines temperature and humidity of
outdoor air.
• Long lasting solid state thermistor sensing element is
accurate and stable over time.
• As enthalpy of outdoor air increases, the outdoor air
damper closes to a preset minimum position.
• As enthalpy of outdoor air becomes low, the outdoor
air damper opens to reduce the cooling load in the
building.
• Maximum economizer savings is achieved when two
C7400A Solid State Enthalpy Sensors are connected
to one W7459 Solid State Economizer Control for
differential enthalpy changeover control.
• Compact size and lightweight construction. Allows
easy mounting in HVAC rooftop unit.
• Sensor is enclosed in a rugged, corrosion-resistant
glass-fiber reinforced plastic duct-mount case.
• Provides a 4 to 20 mA output signal to W7459 Solid
State Economizer Control; setpoint is located on solid
state economizer control.
SPECIFICATIONS
Model:
C7400A Solid State Enthalpy Sensor.
Output Signal:
4 to 20 mA current signal increases from 4 mA to 20 mA as
enthalpy decreases.
Operating Ambient Temperature Range:
-25°F to +125°F (-32°C to +52°C).
Shipping Temperature Range:
-40°F to +150°F (-40°C to +66°C).
Maximum Power Consumption:
0.45 VA.
Supply Voltage:
18-24 Vdc.
Electrical Connections:
Two 1/4 in. (6 mm) quick connect terminals.
Approvals:
Underwriters Laboratories Inc. Flammability Rating: UL94-5V.
Dimensions:
See Fig. 1
M9096
S
+
9/16
(14)
3-7/8 (96)
5/16 (8)
3-5/32 
(80)
2-3/4 
(70)
1 (25)
7/32
(6)
Fig. 1. Approximate dimensions of C7400A Solid State
Enthalpy Sensor in in. (mm).