RT-SVD03L-EN
109
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:
•
Mis-wire/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)
Service Tips
To check for induced voltage, read AC voltage to
ground from each sensor wire. Should be less than 1
VAC.
Figure 67.
Temperature input / voltmeter display
RTRM J6
Heating Setpoint
Mode Input
Cooling Setpoint
Common
Zone Temperature
5.00
DC
Volts
Table 80.
Temperature input
Temp °F
Resistance (K
ohms)
DC Volts
40
26.097
3.613
41
25.383
3.585
42
24.69
3.557
43
24.018
3.528
44
23.367
3.5
45
22.736
3.471
46
22.123
3.442
47
21.53
3.412
48
20.953
3.383
49
20.396
3.353
50
19.854
3.324
51
19.33
3.294
52
18.821
3.264
53
18.327
3.233
54
17.847
3.203
Table 80.
Temperature input (continued)
Temp °F
Resistance (K
ohms)
DC Volts
55
17.382
3.173
56
16.93
3.142
57
16.491
3.111
58
16.066
3.08
59
15.654
3.05
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
68
12.435
2.77
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
9.71
2.462
79
9.477
2.432
80
9.25
2.402
81
9.03
2.372
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
2.08
92
6.963
2.052
93
6.803
2.024
94
6.648
1.996
95
6.497
1.969
Setpoint Input
Terminals to Read Voltage: RTRM J6-3
(cooling), J6-5 (heating), J6-2
Read DC voltage with Zone Sensor Module (ZSM)
attached. If voltage read does not appear to be correct,
read the resistance of the circuit, then the ZSM itself, to
see if a problem exists in the ZSM or the wiring. With
the ZSM not attached there should be 5.00 VDC at the
terminals as shown. To check for induced voltage, read
AC voltage to ground from each sensor wire. Should be
less than 2VAC.
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