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Table 11. Zone Sensor Temperature Resistance
(a) Thumbwheel resistance checks are made at terminal 2 and 3 on the zone sensor. Temperature sensor resistance is measured
VAV-SVX07B-EN
Verify that the zone sensors are not shorted out. Check the resistance across the wires.
Disconnect wires from the UC400 controller and zone sensor, ensuring that the ends are not
touching each other, and then measure resistance. It should be infinite or no conductivity. If
lower resistance is shown, then the wires are shorted together and need to be replaced.
o
Temperature ( F)
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
at terminal 1 and 2 of the zone sensor.
Thermostat Thumbwheel
(a)
Resistance (Ohms)
792
772
753
733
714
694
675
656
636
617
597
578
558
539
519
500
481
461
442
422
403
383
364
344
325
306
286
267
247
228
208
Troubleshooting
Sensor Resistance (k Ohms)
17.0
16.5
16.1
15.7
15.4
15.0
14.6
14.3
14.0
13.6
13.3
13.0
12.6
12.3
12.1
11.8
11.5
11.2
11.0
10.7
10.4
10.2
10.0
9.7
9.5
9.3
9.0
8.8
8.6
8.4
8.2
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