132
RT-SVD03L-EN
N
No
otte
e:: These are economizer inputs only. RTRM, RTOM
inputs (zone temp, setpoints, OAS, DAS) are in
the ReliaTel
™
temperature inputs section.
The ECA module was upgraded August 1st, 2005
to widen the temperature range measured by the
mixed air and return air sensor. As a result, the
open DC voltage values measured at the ECA
also changed. To determine which module you
have, disconnect the sensor and measure the DC
voltage at the MAT or RAT terminals on the ECA.
The voltage reading for modules before August
1st, 2005 will read 2.50 VDC. Modules for August
1st, 2005 and later will be 5.0 VDC.
Economizer Actuator Module W7340A1004
(used prior to 08/1/05)
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 approximately 2.50 VDC at
the terminals listed above.
Service Tips
Terminal 1 in each of these circuits is common. All
common terminals are grounded, therefore one volt
meter lead can be attached to ground for voltage
measurements.
Table 94.
W7340A1004 used before August 1st, 2005
Temp °F
Resistance (K
ohms)
DC Volts
40
26.105
1.853
41
25.393
1.839
42
24.703
1.826
43
24.033
1.812
44
23.385
1.799
45
22.756
1.785
46
22.146
1.771
47
21.554
1.757
48
20.98
1.743
49
20.424
1.728
50
19.884
1.714
51
19.36
1.699
52
18.852
1.685
53
18.359
1.67
54
17.88
1.656
55
17.415
1.641
56
16.964
1.626
57
16.527
1.611
58
16.102
1.596
59
15.689
1.581
60
15.288
1.566
61
14.899
1.551
62
14.521
1.536
63
14.154
1.52
64
13.797
1.505
65
13.451
1.49
66
13.114
1.475
67
12.787
1.46
68
12.469
1.444
69
12.16
1.429
Table 94.
W7340A1004 used before August 1st, 2005
(continued)
Temp °F
Resistance (K
ohms)
DC Volts
70
11.86
1.413
71
11.568
1.398
72
11.284
1.383
73
11.008
1.367
74
10.74
1.352
75
10.479
1.337
76
10.225
1.321
77
9.978
1.306
78
9.738
1.291
79
9.505
1.276
80
9.278
1.261
Economizer Actuator Module W7340B1002
(08/01/05 and later)
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 approximately 5.0 VDC at the
terminals listed above.
Table 95.
W7340B1002 used August 1, 2005 and later
Temp °F
Resistance (K Ohms)
DC Volts
10
63.577
4.317
11
61.624
4.299
12
59.737
4.28
13
57.913
4.261
14
56.153
4.241
15
54.452
4.221
16
52.807
4.201
17
51.216
4.18
18
49.677
4.159
19
48.188
4.138
20
46.748
4.116
21
45.354
4.094
22
44.007
4.072
23
42.705
4.049
24
41.446
4.026
25
40.226
4.002
26
39.046
3.978
27
37.904
3.954
28
36.797
3.929
29
35.726
3.904
30
34.689
3.879
31
33.686
3.853
32
32.72
3.827
33
31.797
3.801
34
30.903
3.775
35
30.037
3.749
36
29.198
3.722
37
28.386
3.695
38
27.599
3.668
39
26.836
3.641
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
Summary of Contents for ReliaTel
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