PRODUCT DATA
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
Solid State Economizer System
(CONSISTING OF: C7046C DISCHARGE AIR SENSOR OR C7150B MIXED AIR SENSOR,
C7400A SOLID STATE ENTHALPY SENSOR OR C7650A SOLID STATE TEMPERATURE SENSOR,
M7415 OR M8405 DAMPER ACTUATORS, T6031H THERMOSTAT AND
W7459A,C, OR D 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,
C7150B Mixed Air Sensor, C7400A Solid State Enthalpy
Sensor or C7650A Solid State Temperature Sensor, M7415
and M8405 Damper Actuators, T6031H Thermostat, and
W7459A,C,D 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 M7415/M8405
Damper Actuator to sense mixed or discharged air in rooftop
packaged air conditioning equipment.
• No setting or calibration required.
C7400A Solid State Enthalpy Sensor and C7650A Solid State
Temperature Sensors are used with the W7459 Solid State
Economizer Logic Module to allow using outdoor air as the
first stage of cooling in HVAC systems.
• C7400A senses and combines temperature and
humidity of outdoor air (heat index).
• C7650A senses temperature only.
• Long-lasting, solid state sensing element is accurate
and stable over time.
• 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.
•Provides a 4 to 20 mA output signal to the W7459 Solid
State Economizer Logic Module; setpoint is located on
solid state economizer control.
• Maximum economizer savings is achieved when two
C7400A Solid State Enthalpy Sensors are connected
to one W7459 Solid State Economizer Logic Module
for differential enthalpy changeover control.
C7046C
C7150B
C7400A/C7650A
M7415/M8405
T6031H
W7459A,C,D
Contents
Application........................................................................... 1
Features .............................................................................. 1
Ordering Information ........................................................... 2
Specifications ...................................................................... 3
Installation ........................................................................... 7
Operation and Checkout ..................................................... 13
Settings and Adjustments ................................................... 15
Sequence of Operation ....................................................... 16
Checkout and Troubleshooting ............................................ 17
(Continued)
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