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Honeywell C7400A - User Manual

Honeywell C7400A
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SYSTEM ENGINEERING GUIDE
63-2484—03
Solid State Economizer System
(CONSISTING OF: C7046C DISCHARGE AIR SENSOR OR C7150B MIXED AIR SENSOR, C7400 SOLID STATE ENTHALPY
SENSOR OR C7660 SOLID STATE TEMPERATURE SENSOR, M7415, M7215 OR M8405 DAMPER ACTUATORS OR MODU-
LATING DIRECT COUPLED ACTUATORS (MS7503 or MS7505) T6031H THERMOSTAT AND W7459 OR W7212 SOLID
STATE ECONOMIZER LOGIC MODULE)
APPLICATION
The Solid State Economizer System provides an economical
method of providing cooling air by incorporating outdoor air in
the first stage of cooling in heating, ventilating and air
conditioning (HVAC) systems. The Solid State Economizer
System consists of the C7046C Discharge Air Sensor or
C7150B Mixed Air Sensor, C7400 Solid State Enthalpy
Sensor or C7660 Solid State Temperature Sensor, M7215,
M7415 or M8405 Damper Actuators or Modulating Direct
Coupled Actuators (MS7503 or MS7505), T6031H Thermostat
and W7212A,C or W7459A,C Solid State Economizer Logic
Module.
FEATURES
C7046C Discharge Air Sensors have probe lengths of 8 in.
(203 mm) and nominal sensor resistance of 3000 ohms at
77°F (25°C).
• No setting or calibration required.
• Solid state components not affected by dust or dirt.
• Fast reacting.
• Rugged aluminum insertion probe.
C7150B Mixed Air Sensor is used with the W7212/W7459
Economizer Module to sense mixed or discharged air in roof-
top packaged air conditioning equipment.
• No setting or calibration required.
C7400 Solid State Enthalpy Sensor and C7660 Solid State
Temperature Sensors are used with the W7212/W7459 Solid
State Economizer Logic Module to sense outdoor and return
air enthalpy or temperature.
• C7400 senses and combines temperature and humidity
(enthalpy) of outdoor air (heat index).
• C7660 senses temperature only and can only be used
in single referential control. Use C7400 enthalpy for
differential control.
• When enthalpy/temperature of outdoor air increases,
the outdoor air damper closes to a preset minimum
position.
• When enthalpy/temperature of outdoor air is low, the
outdoor air damper opens to reduce the building
cooling load.
C7150B
M7215/M7415/
M8405
C7046C
W7459A,C
C7400A/C7660
W7212A,C
T6031H

Table of Contents

Other manuals for Honeywell C7400A

Preview: Product Data
Product Data20 pages

Questions and Answers

  • M
    mendezdouglasAug 7, 2025
    What to do if the compressor does not operate on Honeywell Accessories?
    • N
      Nathan GarciaAug 8, 2025
      If the compressor on your Honeywell Accessories unit isn't running even when all other conditions appear correct, first, check the wiring from terminal {2} to Y1 on the unit's low voltage control board. Also, verify that there are not 24 Vac to Y1 and C on the unit.
  • E
    Elizabeth WilliamsAug 12, 2025
    What to do if the compressor does not operate with second stage conditions met on Honeywell Accessories?
    • A
      angela74Aug 12, 2025
      If the compressor on your Honeywell Accessories unit isn't running even when the second stage conditions are met, check the wiring from {5} to Y2 on the unit low voltage terminal board, assuming all other functions are working correctly.
  • D
    Deanna FullerAug 17, 2025
    How to troubleshoot a motor that doesn't operate on Honeywell Accessories?
    • K
      Kevin HaneyAug 17, 2025
      If the motor of your Honeywell Accessories unit isn't working even when all conditions are met: * Jumper the mixed air sensor terminals {T} and {T1}. * If the motor starts, check the wiring to the sensor. If the wiring is correct, the temperature might be below the sensor's setpoint, or the sensor could be defective. * If the motor still doesn't operate, and the wiring is correct with the temperature above the sensor setpoint, the motor itself might be faulty.
  • B
    Brendan AguilarAug 22, 2025
    What to do if the motor does not operate with all above conditions met on Honeywell Accessories?
    • D
      davidwhiteAug 22, 2025
      If the motor of your Honeywell Accessories unit isn't working even when all conditions are met: * Jumper the mixed air sensor terminals {6} and {D}. * If the motor starts, check the wiring to the sensor. If the wiring is correct, the temperature might be below the sensor's setpoint, or the sensor could be defective. * If the motor still doesn't operate, the wiring is correct, and the temperature is above the sensor setpoint, the motor itself might be faulty.
  • T
    todd78Aug 27, 2025
    Why is there no 24 Vac to terminals {TR} and {TR1} on Honeywell Accessories?
    • J
      jonescassandraAug 27, 2025
      To troubleshoot a lack of 24 Vac to terminals {TR} and {TR1} on your Honeywell Accessories unit, check the wiring from [G] and [C] on the unit's low voltage terminal strip. Note that {TR} and {TR1} power the actuator.
  • S
    Stephanie FernandezSep 1, 2025
    What to do if there is no 24 Vac to terminals {1} and {TR1} on Honeywell Accessories?
    • J
      Joshua EnglishSep 1, 2025
      To troubleshoot a lack of 24 Vac to terminals {1} and {TR1} on your Honeywell Accessories unit, verify that there is a call for cooling from the thermostat. Without a call for cooling, the compressor cannot be in the normal air conditioning mode.

Summary

Solid State Economizer System Overview

Solid State Economizer System Components and Features

Details key sensors (C7046C, C7150B, C7400/C7660) and their features.

Solid State Economizer System Application

Describes the purpose, benefits, and components of the economizer system.

System Components and Specifications

Damper Actuator and Motor Specifications

Covers M7415, M8405, MS7503/MS7505 actuators and M7215 motors.

Thermostat and Logic Module Specifications

Details T6031H thermostat and W7459/W7212 logic modules.

Air Sensor Specifications

Details C7046, C7150B, C7400, C7660 air sensors.

Installation and Wiring

Damper Actuator and Motor Installation and Wiring

Covers mounting and wiring for M7215, M7415, M8405.

Air Sensor Installation and Mounting

Covers C7046C sensor location and mounting procedures.

Logic Module Installation and Mounting

Covers mounting W7459 and W7212 logic modules.

System Operation, Settings, and Adjustments

Economizer Sensor Location and Operation

Covers C7400/C7660 sensor placement and operational aspects.

Economizer Settings and Adjustments

Covers potentiometer adjustments for damper position and setpoints.

Economizer Sequence of Operation

Describes how the economizer system functions.

Troubleshooting and Checkout

Economizer Logic Module Troubleshooting

Addresses common issues and provides troubleshooting steps.

Economizer Checkout Procedures

Provides step-by-step checkout procedures for logic modules.

Honeywell C7400A Specifications

General IconGeneral
BrandHoneywell
ModelC7400A
CategoryControl Systems
LanguageEnglish

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