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Table Of Contents

PRODUCT DATA

63-2140-09

C7400A and C7400C

Enthalpy Sensors

APPLICATION

The C7400A Enthalpy Sensor is used with the economizer

logic modules with the A,B,C, and D performance curves; the

C7400C sensor is used with the logic modules with the

A,B,C,D, and E performance curves. The sensors combined

with the economizer logic modules permit 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.

• 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 mechanical cooling

load in the building.

• Maximum economizer savings is achieved when two

C7400 Enthalpy Sensors are used for differential

enthalpy changeover control.

• Compact size and lightweight construction allows

easy mounting in HVAC rooftop unit. A duct mounting

kit

is available for the 2000 series sensor models

(C7400A2xxx and C7400C2xxx).

• Sensors are enclosed in a rugged, corrosion-resistant

glass-fiber reinforced plastic duct-mount case.

• Provides a 4 to 20 mA output signal to Economizer

Logic Module; setpoint is located on the logic module.

Honeywell part number 50053060-001

Contents

Application ........................................................................ 1

Specifications ................................................................... 2

Installation ........................................................................ 2

Ordering Information ........................................................ 2

Operation .......................................................................... 4

Summary of content (8 pages)

PAGE 1
C7400A and C7400C Enthalpy Sensors PRODUCT DATA APPLICATION The C7400A Enthalpy Sensor is used with the economizer logic modules with the A,B,C, and D performance curves; the C7400C sensor is used with the logic modules with the A,B,C,D, and E performance curves. The sensors combined with the economizer logic modules permit the use of outdoor air as the first stage of cooling in heating, ventilating and air conditioning (HVAC) systems.
PAGE 2
C7400A AND C7400C ENTHALPY SENSORS SPECIFICATIONS INSTALLATION Models: C7400A enthalpy sensor for use with economizer logic modules with A,B,C, and D performance curves. C7400C enthalpy sensor for use with economizer logic modules with A,B,C,D, and E performance curves. When Installing this Product... 1. 2. Dimensions: C7400A1xxx and C7400C1xxx – See Fig. 1. C7400A2xxx and C7400C2xxx – See Fig. 2 on page 3. 3. Output Signal:4 to 20 mA current signal increases from 4 mA to 20 mA as enthalpy decreases.
PAGE 3
C7400A AND C7400C ENTHALPY SENSORS Location IMPORTANT When selecting the location, make sure the C7400 Enthalpy Sensor is not exposed to rain, snow or direct sunlight. 51/64 (21) 4-1/4 (108) NOTES: — 2-3/4 (70) 2-1/64 (55) — — M32331 Fig. 2. Approximate dimensions of C7400A2xxx and C7400C2xxx Enthalpy Sensors in inches (mm). The C7400 Sensor can be mounted in any position.
PAGE 4
C7400A AND C7400C ENTHALPY SENSORS OPERATION Controller Dial Setting C7400A OUTPUT CURRENT Control setpoint scale is located on the logic modules. Control points (A,B,C,D, and E) are field selectable and are used for single enthalpy sensing. Turn to D or E (fully clockwise ) when differential enthalpy control is desired. When differential enthalpy control is desired, two enthalpy sensors must be connected to the economizer logic module. See Fig. 3 on page 3.
PAGE 5
C7400A AND C7400C ENTHALPY SENSORS 46 85 90 95 100 105 110 (29) (32) (35) (38) (41) (43) 44 CONTROL CONTROL POINT APPROX.
PAGE 6
C7400A AND C7400C ENTHALPY SENSORS 46 85 90 95 100 105 110 (29) (32) (35) (38) (41) (43) 44 CONTROL CONTROL POINT CURVE APPROX.
PAGE 7
C7400A AND C7400C ENTHALPY SENSORS 7 63-2140—09
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C7400A AND C7400C ENTHALPY SENSORS Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2011 Honeywell International Inc. 63-2140—09 M.S. Rev. 06-11 Printed in U.S.A.