Honeywell W7459 User Manual

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

Honeywell W7459 Specifications

General

Frequency	50/60 Hz
Differential	Adjustable
Enclosure Rating	NEMA 4X
Termination	Screw Terminals
Application	Industrial burner control
Approvals	UL, CSA, FM

Summary

Solid State Economizer System Overview

System Features

Key features of the Solid State Economizer System components.

Application Overview

How the Solid State Economizer System is applied in HVAC systems.

Economizer Component Details

Damper Actuators and Motors

Details on M7415, M8405, M7215, MS7503, MS7505 actuators and motors.

Logic Modules

Specifications and operation of W7459 and W7212 logic modules.

Sensors and Thermostats

Specifications for sensors (C7046, C7150, C7400, C7660) and thermostat (T6031H).

Installation and Wiring

Component Installation Procedures

Mounting and wiring instructions for various system components.

Logic Module Mounting

Procedures for mounting W7459 and W7212 logic modules.

Settings and Adjustments

Minimum Damper Position Adjustment

How to adjust the minimum damper position for ventilation.

Enthalpy Changeover Setpoint

Setting the enthalpy threshold for economizer operation.

DCV and Exhaust Setpoints

Adjusting DCV and exhaust fan setpoints for ventilation control.

Sequence of Operation

Economizer Sequence

Explains the economizer's operating sequence for cooling.

Differential Enthalpy Control

How differential enthalpy control optimizes cooling with outdoor air.

Troubleshooting and Checkout

Modulating Economizer Troubleshooting

Diagnosing issues with modulating economizers based on conditions.

W7212 Economizer Checkout

Step-by-step checkout procedures for W7212 economizers.