C7772A-E WALLPLATE TEMPERATURE SENSOR
3
68-0213—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.
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 weld-
ing 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.
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
STANDARD UTILITY
CONDUIT BOX
CONNECTOR
LOCKNUT
AND
CONDUIT
TO APPROPRIATE
SYSTEM
COMPONENTS
BLANK
FACEPLATE
M16296
