Honeywell C7046C, C7150B, C7400A, M7415, M8405 Product Data
...
Solid State Economizer System
63-2484-1
(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)
PRODUCT DATA
FEATURES
C7046C Discharge Air Sensors have probe lengths of 8 in.
C7046C
M7415/M8405
C7150B
C7400A/C7650A
T6031H
W7459A,C,D
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.
(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.
(Continued)
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
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
SOLID STATE ECONOMIZER SYSTEM
M7415 and M8405 Damper Actuators are 25 lb-in. spring
return damper actuators that provide modulating or threeposition control of economizer systems, ventilation dampers
and combustion air dampers used in residential or
commercial HVAC equipment.
• M7415 Damper Actuator provides modulating
control of economizer dampers from a thermistor
mixed-air or discharge sensor to maintain 56°F
(13°C) air temperature.
• M8405A Damper Actuator provides three-position
control: closed, adjustable mid-position, and open.
• Quiet, high efficiency drive motor.
• High impact, glass-fiber reinforced, plastic case is
rugged, lightweight and corrosion resistant.
T6031H Thermostat acts as changeover thermostat.
• Switches enclosed to resist effects of dust and
moisture.
•Warmer-Cooler temperature scale.
• Sensing bulb installed in return air flow.
W7459A,C,D Solid State Economizer Logic Module used
with C7400 Solid State Enthalpy Sensors and M7415 or
M8405 Damper Actuators to proportion outdoor and
return air dampers for economizer control in commercial
HVAC equipment.
• Combine functions of solid state enthalpy changeover
control, minimum damper position potentiometer
(W7459A,D) and compressor staging relays.
• Optional differential enthalpy control provides greater
economizer savings than single enthalpy control by
selecting the most economical air for cooling.
Differential enthalpy control utilizes two sensor inputs:
one in return air and one in outdoor air; the
economizer control then determines which air has the
lower enthalpy.
• Solid state control package provides improved
accuracy, reliability and stability.
• W7459A,D mounts on M7415 Damper Actuator and
accepts inputs from C7150B Mixed Air Sensors,
C7400 Solid State Enthalpy Sensors, C7046C
Discharge Air Sensor, and optional remote minimum
damper position potentiometer.
• W7459C mounts on M8405A Damper Actuator and
accepts inputs from single pole single throw (spst)
mixed or discharge air control and C7400 Solid State
Enthalpy Sensors.
•Packages are designed to operate from the cooling
space thermostat to provide a totally integrated
control system.
• Housed in high-impact, glass-fiber reinforced plastic
case that matches the lines of M7415 and M8405
Damper Actuators.
• Quick connect terminals.
• Enthalpy setpoint (A,B,C,D) located on W7459 Solid
State Economizer Logic Module is used to select
combination of air temperature and humidity that is
suitable for free cooling.
• W7459A,D include built-in adjustable minimum damper
position potentiometer that controls the amount of
outdoor air admitted to meet minimum ventilation
requirements; include terminals for connecting
optional remote minimum position potentiometer.
• LED on W7459 indicates free cooling is available when
there is a call for cooling from the thermostat.
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Relations
Honeywell, 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
63-2484—1
2
SOLID STATE ECONOMIZER SYSTEM
SPECIFICATIONS
IMPORTANT
The specifications given in this publication do not
include normal manufacturing tolerances. Therefore,
these units may not exactly match the specifications
listed. Also, these products are tested and calibrated
under closely controlled conditions and some minor
differences in performance can be expected if these
conditions are changed.
Models:
Specifications for each model are listed separately.
C7046 Discharge Air Sensors
Intended for use as a discharge sensor in rooftop
applications.
Sensing Element:
Carbon type, thermistor-resistor element.
Performance Characteristics:
Reaction Time Constant with Air Approach Velocity of
8.33 ft/sec (2.54 m/sec): 60 seconds.
Resistance/Temperature (NTC):
Nominal Resistance: 3000 ohms at 77°F (24°C).
Nominal Sensitivity: 70 ohms per degree F (124 ohms per
degree C) at midrange.
Maximum Ambient Temperature:
250°F (121°C).
Operating Temperature Range:
-40°F to +110°F (-40°C to +44°C).
Dimensions:
See Fig. 2.
C7400A Solid State Enthalpy Sensor/C7650A Solid
State Temperature Sensor
Permits use of outdoor air as the first stage of cooling in
HVAC systems.
Temperature Sensing Element:
Thermistor.
Output Signal:
4 to 20 mA current signal; increases from 4 mA to 20 mA as
enthalpy decreases.
Ambient Operating Temperature Range:
-40°F to +125°F (-40°C to +52°C).
3/4
(19)
Mounting Arrangement:
Integral mounting flange that requires two no. 8 screws
(not provided).
Maximum Ambient Temperature:
250°F (121°C).
Operating Temperature Range:
40°F to 150°F (4°C to 66°C).
Wiring Connections:
6 in. (152 mm) leadwires.
Dimensions:
See Fig. 1.
C7150B Mixed/Discharge Air Sensor
Used to sense mixed or discharged air in rooftop packaged
air conditioning equipment.
Resistance/Temperature (NTC):
Nominal Resistance: 3000 ohms at 77°F (24°C).
Nominal Sensitivity: 70 ohms per degree F (124 ohms per
degree C) at midrange.
7/8
(22)
3/16 (5) DIAMETER
2
(51)
2-1/2 (64)
M9084
Fig. 2. Approximate dimensions of C7150B Mixed/
Discharge Air Sensor in in. (mm).
1/2 (13)
DIAMETER
3/8 (10)
DIAMETER
1/4 (6)
DIAMETER
(2)
3/4 (19)
1-1/2 (38)
Fig. 1. Approximate dimensions of C7046C Air Temperature Sensor in in. (mm).
9/16
(14)
IMMERSION LENGTH: 8 (203)
M9087
3
63-2484—1
SOLID STATE ECONOMIZER SYSTEM
Approval:
Underwriters Laboratories Inc. Flammability Rating:
UL94-5V.
Dimensions:
See Fig. 3.
5/16 (8)
9/16
(14)
1 (25)
3-5/32
(80)
2-3/4
(70)
7/32
(6)
3-7/8 (96)
+
S
M9096
Fig. 3. Approximate dimensions of C7400A Solid State
Enthalpy Sensor/C7650A Solid State
Temperature Sensor in in. (mm).
M7415A, M8405A Damper Actuators
Provides control of economizer systems, ventilation dampers
and combustion air dampers used in residential or
commercial HVAC equipment.
Actuator Rotation:
Closed position is the limit of clockwise rotation; open position
is the limit of counterclockwise rotation as viewed from the
shaft end of the motor. These motors are shipped with the
shaft in the closed position.
Auxiliary Switch Rating (M8405A only):
24 Vac, 20 VA inrush, 20 VA run (R8222 or equivalent load).
Terminal Connections:
1/4 in. (6 mm) male quick connect terminals mounted on
actuator. Terminal arrangement is dependent on actuator
model.
Ambient Operating Temperature Range:
-40°F to +125°F (-40°C to +52°C).
Voltage and Timing:
See Table 1.
Dimensions:
See Fig. 4.
Shaft:
Single-ended drive shaft with crank arm supplied.
Flammability Rating:
Underwriters Laboratories Inc. UL94-5V.
Approval:
Underwriters Laboratories Inc.
Component Recognized: File No. E4436, Guide No. XAPX2,
Vol. 9, Section 1, 7-25-83.
Table 1. M7415A/M7405A Actuator Specifications.
Power (Vac) Torque
Model
Number
M7415A
M8405A
a
Timing with 60 Hz power.
b
Spring return.
c
Modulating.
d
Three-position with field adjustable minimum position control.
Voltage (Vac)
50/60 Hz (Drive) (Hold)
b,c
24 8 5 90 90 25 2.8 ccw cw
b,d
24 7 3 90 90 25 2.8 ccw cw
4-1/2 (114)
4-1/32
(102)
7/16
(11)
3-1/2 (89)
2-1/4 (57)
5-3/16 (132)
1-1/4
(32)
4-1/2
(114)
(127)
5
Timing
(sec)
4-1/2
(114)
Stroke
a
(°) (lb-in.) (N•m)
Open Rotation
(Shaft End View)
1/4 (6)
1-3/8 (35)
3-1/8 (79)
Spring Return
(Shaft End View)
M3851TOP VIEW SIDE VIEW POWER END VIEW
Fig. 4. Approximate dimensions of M7415A and M8405A in in. (mm).
63-2484—1
4
SOLID STATE ECONOMIZER SYSTEM
M9085A
2-3/16
(56)
4-1/16
(103)
7/8 (22)
5/8
(16)
2-13/16 (71)
1-1/4
(32)
T6031H Thermostat
A standard spdt switch, without a case, that acts as a
changeover thermostat.
Electrical Rating:
0.25A at 1/.4V to 12 Vdc inductive load.
Control Range, Element Temperature and Differential:
See Table 2.
Approval:
Underwriters Laboratories Inc. Listed:
File E4436, Vol. 4, Guide No. XAPX2.
Dimensions:
See Fig. 5.
MOUNTING
HOLES
1
3/4 (19)
4-3/16
(106)
Temperature Ratings:
-25°F to +125°F (-32°C to +52°·C).
Approval:
Underwriters Laboratories Inc.:
Flammability Rating: UL94V-5V.
Specifications:
See Table 3.
Dimensions:
See Fig. 6.
OVERALL LENGTH: 5 (127)
OVERALL DEPTH LESS
ADJUSTING DIAL SHAFT:
2-1/8 (54)
ON THE 114496 BRACKET, THE MOUNTING HOLES ARE TWO
1
NO. 8-32 TAPPED HOLES. THE 107940 BRACKET IS MOUNTED
WITH A 5/32 (4) DIAMETER HOLE AT THE TOP AND A VERTICAL
5/32 X 5/16 (4 X 8) SLOT AT THE BOTTOM.
Fig. 5. Approximate dimensions of back mounting
M9090
bracket for T6031H in in. (mm).
W7459A,C,D Solid State Economizer Logic Module
Used with C7400 Sensor or C7650A Sensor and M7415 or
M8405 Actuator to proportion outdoor and return air
dampers for economizer control in commercial HVAC
equipment. Do
enthalpy limit devices.
Electrical Ratings:
Input Voltage: 24 Vac, 50/60 Hz.
Power Consumption: 5.5 VA.
Relay Contact Rating at 24 Vac: 1.5A run, 3.5A inrush.
Model
Number
T6031H 0° to 95° -18° to +35° 150° 66° 3° 2° Back 2 0.6 3/8 x 3-1/2 10 x 89
not
use C7650A Sensor with W7459D high
Table 2. T6031H Thermostat Specifications.
Control
Range
°F °C °F °C °F °C
Max Element
Temperature Differential
Fig. 6. Approximate dimensions of W7459 Solid State
Economizer Logic Module in in. (mm).
Capillary
Type of
Mounting
Length Bulb Size
ft m in. mm
5
63-2484—1
SOLID STATE ECONOMIZER SYSTEM
Table 3. W7459A,C,D Specifications.
For Use with
Model
Actuator
W7459A M7415 Thermistor Sensor Yes Yes 2 spdt
W7459C M8405 Spst control No. Minimum position
W7459DaM7415 Thermistor Sensor
a
W7459D has a high enthalpy limit and defaults to mechanical cooling when the outdoor enthalpy reaches the preset limit.
Do not use a dry bulb sensor for a high temperature limit.
Discharge Air
Temperature Input
C7150B or C7046A
Minimum Position
Potentiometer Adjustment
Terminals for Remote
Minimum Damper Position
Output
Relays
No 2 spdt
adjustment is built into
M8405 Actuator
Yes Yes 2 spdt
INSTALLATION
When Installing these Products…
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and marked
on the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
CAUTION
CAN CAUSE ELECTRICAL SHOCK OR
EQUIPMENT DAMAGE.
Disconnect power supply before connecting wiring.
C7046C Discharge Air Temperature Sensor
The sensor assembly consists of an aluminum sensor
probe (element housed internally) with attached flange that
can be mounted on a flat duct or plenum surface, or in a
2 in. by 4 in. (51 by 102 mm) junction box, using two no. 8
screws. Connections to the sensor are made through two
6 in. (152 mm) leadwires.
쐋 If necessary, use the flange as a template to mark and
drill two holes for no. 8 mounting screws.
쐏 Fasten the sensor to the duct or plenum surface with
the two no. 8 sheet metal screws (not provided).
To mount the C7046C Sensor in a junction box (see Fig. 8):
쐃 Cut a 1/2 in (13 mm) hole in the duct or plenum surface
at the desired location.
쐇 Remove the center rear knockout from the junction box
and insert the sensor probe through the knockout with
the flange flat against the junction box.
쐋 Using the flange as a template, mark and drill two holes
in the junction box and the duct or plenum surface for
no. 8 mounting screws.
쐏 Insert the sensor probe through both the junction box
knockout and the 1/2 in. (13 mm) hole drilled in the duct
or plenum and fasten the junction box and sensor to the
duct or plenum surface with the two no. 8 sheet metal
screws (not provided).
SYSTEM DUCT OR PLENUM
FLANGE
SENSOR PROBE
NO. 8
MOUNTING
SCREWS (2)
Location
Locate the sensor in the air duct or plenum where it can
sample average air temperature. Avoid locations where air
stratification can cause sensing errors.
Mounting
To mount the C7046C Sensor on a flat duct or plenum
surface (see Fig. 7):
쐃 Cut a 1/2 in (13 mm) hole in the duct or plenum surface
at the desired location.
쐇 Insert the sensor probe into the duct or plenum hole
until the flange rests against the duct or plenum wall.
63-2484—1
1
TO APPROPRIATE
SYSTEM COMPONENTS
(SEE WIRING DIAGRAM)
SCREWS NOT PROVIDED.1
SENSOR WIRES WITH
2 SOLDERLESS
CONNECTORS
M9086
Fig. 7. Mounting C7046C Air Temperature
Sensor on duct or plenum.
6
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