Honeywell Weather Radio C7772A User Manual

C7772A, F, G  
Wallplate Temperature Sensor  
PRODUCT DATA  
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.  
APPLICATION  
The C7772A series of Wallplate Temperature Sensors are  
designed to be used with the Excel 5000 family and other  
Honeywell controllers. The C7772F Series is designed to be  
used with the TB7600, TB7300, and TB7200 Series  
communicating thermostats and other controllers that require  
a 10K ohm NTC Type II sensor. The C7772G is designed to  
be used with WEBs-AX I/O modules and other controllers that  
require a 10K ohm NTC Type III sensor. The C7772 sensors  
provide a resistive output signal proportional to sensed room  
or space temperature. The C7772 is well suited for low-profile  
wall-mounted applications where durability and tamper-proof  
construction is desired, such as schools, prisons and  
institutions.  
 
C7772A, F, G WALLPLATE TEMPERATURE SENSOR  
Table 1. C7772 Models.  
Resistance-Temperature  
Curve Type  
Lead Wire  
Color  
Model  
C7772A  
C7772F  
C7772G  
Sensor Type  
20K NTC Thermistor  
Nominal Resistance  
20,000 ohms at 77°F (25°C)  
Non-linear Negative TCR  
Green/Blue  
Green/White  
White/White  
10K Ohm NTC Type II Thermistor  
10K Ohm NTC Type III Thermistor  
10,000 ohms @ 77°F (25°C) Non-linear Negative TCR  
10,000 ohms @ 77°F (25°C) Non-linear Negative TCR  
NOTE: TCR = temperature coefficient of resistance.  
Mounting  
To mount on conduit box (see Fig. 2):  
1.  
Do not route temperature sensor wiring with  
1. Remove the appropriate knockout on the standard utility  
conduit box for the application.  
2. Make wiring connections to the system components.  
building power wiring, next to control contactors,  
near light dimming circuits, electric motors or  
welding equipment.  
2.  
3.  
Avoid poor wiring connections.  
Do not mount sensor in an incorrect environment.  
IMPORTANT  
Level only for appearance. The sensor functions  
normally even when not level.  
Connect the low voltage wiring from the controller terminals to  
the sensor screw terminals and tighten. See Fig. 2.  
3. Use the No. 6 screws provided to mount the wallplate to  
the conduit box.  
STANDARD UTILITY  
CONDUIT BOX  
Wiring  
BLANK  
FACEPLATE  
CAUTION  
Electrical Shock or Equipment Damage Hazard.  
Can shock individuals or short equipment  
circuitry.  
CONNECTOR  
LOCKNUT  
AND  
CONDUIT  
Disconnect all power supplies before installation.  
CAUTION  
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.  
Erratic System Operation Hazard.  
TO APPROPRIATE  
SYSTEM  
COMPONENTS  
M16296  
Shielded cable is required in installations where these  
guidelines cannot be met.  
Ground shield only to grounded controller case.  
Fig. 2. Mounting, wiring for C7772.  
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  
wallplate sensor is 300 ft (91m).  
OPERATION  
The C7772 Wallplate Temperature Sensor provides a resistive  
output signal proportional to the sensed room temperature.  
NOTE: Erratic temperature readings from a sensor can be  
caused by the wiring practices described below.  
These must be avoided to assure proper operation:  
3
68-0213—04  
 
C7772A, F, G WALLPLATE TEMPERATURE SENSOR  
Table 2. Typical Resistance of Sensor Models.  
CHECKOUT  
Typical Resistance (in ohms)  
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.  
C7772A  
54,200  
C7772F  
25,392  
C7772G  
23,467  
At 41°F (5°C)  
At 50°F (10°C) 41,758  
At 59°F (15°C) 32,427  
At 68°F (20°C) 25,370  
At 77°F (25°C) 20,000  
At 86°F (30°C) 15,856  
At 95°F (35°C) 12,654  
19,901  
15,712  
12,493  
10,000  
8,057  
18,789  
15,137  
12,268  
10,000  
8,196  
6,531  
6,754  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
® U.S. Registered Trademark  
© 2012 Honeywell International Inc.  
68-0213—04 L.L. Rev. 01-2012  
Printed in United States  
Golden Valley, MN 55422  
customer.honeywell.com  
 

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