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Zone Sensor Module Testing
Mechanical Zone Sensor Module
Temperature input
Terminals to read voltage: RTRM J6-1, J6-2
Read DC voltage with the sensor attached. If voltage does not appear to be correct, read the
resistance of the circuit, then the sensor itself, to see if a problem exists in the sensor or the wiring.
With the sensor not attached there should be 5.00 VDC at the terminals as shown below.
Problems to look for:
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Service Tips:
To check for induced voltage, read AC voltage to ground from each sensor wire. Should be less than
1 VAC.
Figure 51. ZSM Testing/voltmeter display
Heating Setpoint
Cooling Setpoint
Zone Temperature
Table 26. Temperature Input
Temp
Resistance
DC
°F
(K ohms)
Volts
40
26.097
3.613
41
25.383
3.585
42
24.690
3.557
43
24.018
3.528
44
23.367
3.500
45
22.736
3.471
46
22.123
3.442
47
21.530
3.412
48
20.953
3.383
49
20.396
3.353
50
19.854
3.324
51
19.330
3.294
52
18.821
3.264
53
18.327
3.233
78
Miswire/short/open
Excessive resistance in circuit (corroded or loose connection)
Sensor inaccurate (should be ± 2F of chart)
Moisture in sensor (becomes accurate when dry)
Induced voltage (high voltage wires in same conduit)
RTRM J6
Mode Input
Common
Temp
Resistance
DC
°F
(K ohms)
Volts
54
17.847
3.203
55
17.382
3.173
56
16.930
3.142
57
16.491
3.111
58
16.066
3.080
59
15.654
3.050
60
15.253
3.019
61
14.864
2.988
62
14.486
2.957
63
14.119
2.926
64
13.762
2.895
65
13.416
2.864
66
13.078
2.832
67
12.752
2.801
5.00
DC
Volts
Temp
Resistance
DC
°F
(K ohms)
Volts
68
12.435
2.770
69
12.126
2.739
70
11.827
2.708
71
11.535
2.677
72
11.252
2.646
73
10.977
2.616
74
10.709
2.58
75
10.448
2.554
76
10.194
2.523
77
9.949
2.493
78
9.710
2.462
79
9.477
2.432
80
9.250
2.402
81
9.030
2.372
Temp
Resistance
DC
°F
(K ohms)
Volts
82
8.815
2.342
83
8.607
2.312
84
8.404
2.283
85
8.206
2.253
86
8.014
2.224
87
7.827
2.195
88
7.645
2.166
89
7.468
2.137
90
7.295
2.109
91
7.127
2.080
92
6.963
2.052
93
6.803
2.024
94
6.648
1.996
95
6.497
1.969
RT-SVD03G-EN
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Troubleshooting
