C7772A-E
Wallplate Temperature Sensor
FEATURES
• Low profile when mounted on industry standard utility
conduit box.
• Rugged, brushed stainless steel wallplate.
• Integral foam pad isolates wallplate sensor from
conduit box.
• Insulated screw terminals ensure reliable field wiring
connection.
• Models available with a variety of resistive temperature
sensor elements.
PRODUCT DATA
APPLICATION
The C7772 series of Wallplate Temperature Sensors are
designed to be used with the Excel 5000 family and other
Honeywell controllers. The C7772 sensors provide a resistive
output signal proportional to sensed room or space
temperature. The C7772 is well suited for low-profile wallmounted applications where durability and tamperproof
construction is desired, such as schools, prisons and
institutions.
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Specifications ................................................................... 2
Installation ........................................................................ 2
Operation .......................................................................... 3
Checkout .......................................................................... 3
68-0213-2
C7772A-E WALLPLATE TEMPERATURE SENSOR
SPECIFICATIONS
Models: See Table 1.
Dimensions: See Fig. 1.
Temperature Ratings:
Operating: 45°F to 99°F (7°C to 37°C).
Shipping: -40°F to 150°F (-40°C to 65°C).
Humidity Ratings: 5 to 95% rh, non-condensing.
Approvals:
National Electrical Code (NEC) Class II.
4-1/2
(114)
2-3/4 (70)
Fig. 1. C7772 Dimensions in in. (mm).
3-5/16
(84)
5/16 (8)
M16295A
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. Follow local codes for installation and application.
IMPORTANT
All wiring must agree with applicable codes,
ordinances and regulations.
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect all power supplies before installation.
Location
The C7772 Wallplate Temperature Sensor should be located
where it can sample an average air temperature. Avoid
locations where air stratification can cause sensing errors.
The sensor mounts directly on a 2 in. x 4 in. conduit box with
the screws provided.
Table 1. C7772 Models.
Model Sensor Type Nominal Resistance
C7772A 20K NTC Thermistor 20,000 ohms at 77°F (25°C) Non-linear Negative TCR Green/Blue
C7772B PT 1000 (TCR=385) Platinum Film 1000 ohms at 32°F (0°C) Linear Positive TCR Red
C7772C PT 100 (TCR=385) Platinum Film 100 ohms at 32°F (0°C) Linear Positive TCR Yellow
C7772D PT 3000 Platinum Film 3,266 ohms at 32°F (0°C) Linear Positive TCR Blue
C7772E 1420 ohm Resistor 1420 ohms at 75°F (24°C) Linear (15 ohms per °F) Red/Violet
NOTE: TCR = temperature coefficient of resistance.
Resistance-Temperature
Curve Type
Leadwire
Color
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, 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.
68-0213—2 2
Mounting
To mount on conduit box (see Fig. 2):
1. Remove the appropriate knockout on the standard utility
conduit box for the application.
2. Make wiring connections to the system components.
IMPORTANT
Level only for appearance. The sensor functions
normally even when not level.
3. Use the No. 6 screws provided to mount the wallplate to
the conduit box.
C7772A-E WALLPLATE TEMPERATURE SENSOR
STANDARD UTILITY
CONDUIT BOX
BLANK
FACEPLATE
CONNECTOR
LOCKNUT
AND
CONDUIT
Wiring
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect all power supplies before installation.
CAUTION
Erratic System Operation Hazard.
Failure to follow proper wiring practices can
introduce disruptive electrical interference (noise).
Keep wiring at least one foot away from large inductive
loads such as motors, line starters, lighting ballasts,
and large power distribution panels.
Shielded cable is required in installations where these
guidelines cannot be met.
Ground shield only to grounded controller case.
IMPORTANT
• Temperature sensor wiring can be sized from
16 to 20 AWG depending on the application.
• The maximum length of wire from a device to the wall-
plate sensor is 300 ft (91m).
NOTE: Erratic temperature readings from a sensor can be
caused by the wiring practices described below.
These must be avoided to assure proper operation:
1. Do not route temperature sensor wiring with
building power wiring, next to control contactors,
near light dimming circuits, electric motors or welding equipment.
2. Avoid poor wiring connections.
3. Do not mount sensor in an incorrect environment.
Connect the low voltage wiring from the controller terminals to
the sensor screw terminals and tighten. See Fig. 2.
TO APPROPRIATE
SYSTEM
COMPONENTS
M16296
Fig. 2. Mounting, wiring for C7772.
OPERATION
The C7772 Wallplate Temperature Sensor provides a resistive
output signal proportional to the sensed room temperature.
CHECKOUT
The C7772 Wallplate Temperature Sensor is immediately
operational after wiring connections are made. Use an
accurate thermometer of ±1°F (0.5°C) to measure the
temperature at the sensor location. To verify sensor accuracy,
use an ohmmeter to measure the resistance across the sensor
wires and use Table 2 to check the accuracy of the specific
model.
Table 2. Typical Resistance of Sensor Models.
Typical Resistance (in ohms)
C7772A C7772B C7772C C7772D C7772E
At 41°F (5°C) 54,200 1020 102 3310 1930
At 50°F (10°C) 41,758 1039 103.9 3353 1795
At 59°F (15°C) 32,427 1059 105.9 3397 1660
At 68°F (20°C) 25,370 1078 107.8 3440 1525
At 77°F (25°C) 20,000 1097 109.7 3484 1390
At 86°F (30°C) 15,856 1117 111.7 3527 1255
At 95°F (35°C) 12,654 1137 113.7 3571 1120
3 68-0213—2
C7772A-E WALLPLATE TEMPERATURE SENSOR
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9
customer.honeywell.com
® U.S. Registered Trademark
© 2005 Honeywell International Inc.
68-0213—2 B.B. Rev. 08-05
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