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Honeywell W7459A

Honeywell W7459A
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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

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Questions and Answers:

Honeywell W7459A Specifications

General IconGeneral
Voltage24V AC
Frequency60 Hz
Housing MaterialPlastic
Enclosure RatingNEMA 1
Input Voltage24V AC
TypeElectronic Controller
ApplicationHVAC Control

Summary

Solid State Economizer System Overview

System Engineering Guide

Provides technical guidelines for system engineering.

Features

Highlights key characteristics and capabilities of the economizer system components.

Application

Explains the use cases and purpose of the solid state economizer system.

Component Specifications

Sensors Specifications

Details specifications for various sensors used in the economizer system.

Actuators and Thermostat Specifications

Covers specifications for damper actuators and the thermostat.

Logic Modules Specifications

Details specifications and features of the W7459 and W7212 economizer logic modules.

Installation, Operation, and Settings

Actuator and Sensor Installation

Guides for installing actuators, sensors, and logic modules.

Component Operation

Explains the operational behavior of actuators, sensors, and logic modules.

Sequence of Operation

Describes the economizer operating sequence for cooling.

Settings and Adjustments

Guides for adjusting economizer system settings, damper positions, and setpoints.

W7212 Module Operation and Settings

Explains operational modes, configurations, and adjustments for the W7212 module.

Checkout and Troubleshooting

General Checkout and Troubleshooting

Provides steps for checkout and troubleshooting the economizer system.

W7212 Checkout Procedure

Step-by-step checkout procedures for W7212 economizers.

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