Page 1
C7660
Selectable Temperature Sensor
FOR ECONOMIZERS
FEATURES
• Senses temperature of outdoor air and provides a
signal to economizer control with OK or not OK to
economize.
• Selectable dip switch provides 8 change over
temperature options.
• When temperature of outdoor air is below change over
temperature, the outdoor air damper is opened to
reduce the cooling load in the building.
• Provides 4 OR 20 mA output signal to economizer
control; At 4 mA not OK to economize, 20 mA OK to
economize.
• Highly accurate microprocessor control.
• Sensor is enclosed in a rugged, corrosion-resistant
plastic case.
• Replaces C7650 temperature sensors and the control
function of temperature change over in the economizer
control.
PRODUCT DATA
GENERAL
C7660 Selectable Temperature Sensor is used with the
W7459, W7215, W7212, W7213 and W7214 Economizer
Controls. The economizer controls are mounted on an M7415/
M7215 Actuator. They permit the use of outdoor air as the first
stage of cooling in heating, ventilating and air conditioning
(HVAC) systems.
The C7660 Selectable Temperature Sensor is only to be used
with single temperature change over with the sensor located
in the outdoor air.
Contents
General .............................................................................1
Features............................................................................1
Specifications.................................................................... 1
Ordering Information .........................................................2
Installation......................................................................... 2
Operation ..........................................................................3
63-2670EF-01
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C7660 SELECTABLE TEMPERATURE SENSOR
SPECIFICATIONS
Model: C7660 Selectable Temperature Sensor
Case: Duct mount
Temperature Sensing Element: Thermistor
Output Signal: 4mA not OK to economize, 20 mA OK to
economize
Operating Ambient Temperature Range: -40° to 149° F
(-40° to 65° C).
Shipping Temperature Range: -40° to 149° F (-40° to
65° C).
9/16
(14)
1 (25)
5/16 (8)
3-5/32
(80)
2-3/4
(70)
7/32
(6)
ON
1 2 3
OFF
+
–
3-7/8 (96)
M27634
Supply Voltage: Power to sensor is supplied through
economizer or if not used with an economizer, logic power
input is 21.6 vdc ± 1.5 vdc.
Electrical Connections: Two 1/4 in. (6.4 mm) quick connect
terminals.
Approval: Underwriters Laboratories Inc. Flammability
Rating UL94-5V
Dimensions: See Fig. 1
Hysteresis: Hysteresis +/- 1F; Economizer Cut-in 1F below
setpoint, Cut-out 1F above setpoint
Accuracy: ± 1° F
Fig. 1. C7660 Selectable Temperature Sensor Dimensions
in in. (mm).
INSTALLATION
When installing this Product...
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 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 product
operation as provided in these instructions.
5. Verify dip switch settings match desired changeover
outside air temperature.
6. Verify polarity of wiring connections from sensor to
controller is correct.
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 Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).
2. Honeywell Customer Care
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, 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.
63-2670EF—01 2
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C7660 SELECTABLE TEMPERATURE SENSOR
W7459 ECONOMIZER PACKAGE MOUNTED ON ACTUATOR
L1
(HOT)
L2
+
2
–
C7660 OUTDOOR
AIR TEMPERATURE
SENSOR
3
620 OHM
RESISTOR
1
TR
SO
SR
TR1
+
BC
A
D
TEMPERATURE
SETPOINT
+
5
1
2
3
4
MINIMUM
POSITION
T
T1
P
P1
OPEN
W7459 ECONOMIZER PACKAGE ACTUATOR
1
SEE W7459 SPECIFICATIONS FOR ADDITIONAL WIRING INFORMATION.
2
POLARITY OF SENSOR IS REQUIRED TO CONNECT + ON SENSOR TO + ON ECONOMIZER AND – ON SENSOR TO SO ON ECONOMIZER.
3
ONLY ONE C7660 SENSOR CAN BE USED WITH AN ECONOMIZER FOR SINGLE DRY-BULB CHANGEOVER. DO NOT USE A SECOND
C7660 SENSOR ON THE SR AND SR+ TERMINALS.
TR
TR1
TR
TR1
TR
TR1
24 Vac
MIXED AIR
SENSOR
MINIMUM
POSITION
M27635
Fig. 2. Wiring Connections for C7660 Temperature Sensor.
CAUTION
1. Before beginning installation, disconnect power
supply to prevent electrical shock or equipment
damage.
2. When selecting the location, make sure the
sensor is not exposed to rain, snow or direct
sunlight.
Location
The C7660 Temperature Sensor can be mounted in any
position; however, the sensor must be installed where it is
exposed to freely circulating air but protected from rain and
direct sunlight.
Wiring
Disconnect power supply before beginning installation to
prevent electrical shock or equipment damage. All wiring must
comply with applicable codes and ordinances. Follow the
wiring information furnished by the equipment manufacturer or
see Fig. 2 for typical wiring hookups.
OPERATION
Temperature Change Over Control Setting
The temperature change over setpoint is made by changing
the setting on a 3-position dip switch through the cover of the
sensor. See Fig. 3 for temperature change over settings.
Operation
The C7660 Selectable Temperature Sensor is used with an
economizer control and damper actuator to proportion an
outdoor air damper in a ventilation system.
When outdoor air temperature is below the change over
setpoint, the sensor will provide a 20 mA signal to the
economizer with translate to OK to economize
damper open on a call for cooling. When the outdoor air is
above the change over setpoint, the sensor provides a 4 mA
signal to the economizer which translates to not OK to
economize and the outdoor damper drives to minimum
position.
The C7660 temperature sensors replace the control function of
the temperature changeover in the economizer control.
The A, B, C, D potentiometer on the economizer does not
control the changeover point when a C7660 sensor is used in
place of an enthalpy sensor. This potentiometer is only
adjusted when using a C7400 enthalpy sensor for single
enthalpy changeover. For single dry-bulb and differential
enthalpy set the potentiometer to “D”.
positioning the
3 63-2670EF—01
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C7660 SELECTABLE TEMPERATURE SENSOR
The changeover temperature switch settings for the C7660
are shown in Fig. 3. Default and factory setpoint is 63° F.
Changeover on an economizer can operate in two basic
modes:
1) exclusive operation where either the economizer or the
mechanical cooling function, but not both OR
2) integrated operation where the economizer and mechanical
cooling operate at the same time. Integrated operation
requires a two stage cooling thermostat. The integrated
control will provide the most energy savings.
DIP SWITCH
POSITION
ON
OFF
132
ON
OFF
132
ON
OFF
132
For exclusive operation, the changeover set point needs to
allow mechanical cooling when the economizer can no longer
meet the cooling load requirement. The 63 degree F setting is
the most typical changeover set point for this type of control
but is dependent on the building and climate.
For integrated operation, the changeover should be just at or
just below the typical cooling setpoint expected in the zone
served. For example, if the cooling setpoint is 74 degrees F or
75 degrees F, the changeover setpoint should be set at 73
degrees F.
CHANGEOVER
TEMPERATURE
48ºF
53ºF
55ºF
ON
OFF
58ºF
132
ON
OFF
63ºF
132
ON
OFF
68ºF
132
ON
OFF
73ºF
132
ON
OFF
78ºF
132
Fig. 3. C7660 Temperature Sensor Dip Switch Settings.
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9
customer.honeywell.com
M27636
® U.S. Registered Trademark
© 2008 Honeywell International Inc.
63-2670EF—01 M.S. 09-08
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