106 RT-SVD03G-EN
ReliaTel Economizer Operation & Inputs
ReliaTel Economizer Inputs
Terminals to read voltage:
Note: These are Economizer inputs only. RTRM, RTOM inputs (Zone temp, Setpoints, OAS, DAS)
are in the ReliaTel Temperature inputs section.
Note: 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.
Mixed Air Sensor
ECA
Module
MAT
Return Air Sensor
ECA
Module
RAT
Table 39. W7340A1004 used Before August 1st, 2005
Temp °F
Resistance
(K ohms)
DC
Volts
Temp°
F
Resistance
(K ohms)
DC
Volts
40 26.105 1.853 61 14.899 1.551
41 25.393 1.839 62 14.521 1.536
42 24.703 1.826 63 14.154 1.520
43 24.033 1.812 64 13.797 1.505
44 23.385 1.799 65 13.451 1.490
45 22.756 1.785 66 13.114 1.475
46 22.146 1.771 67 12.787 1.460
47 21.554 1.757 68 12.469 1.444
48 20.980 1.743 69 12.160 1.429
49 20.424 1.728 70 11.860 1.413
50 19.884 1.714 71 11.568 1.398
51 19.360 1.699 72 11.284 1.383
52 18.852 1.685 73 11.008 1.367
53 18.359 1.670 74 10.740 1.352
54 17.880 1.656 75 10.479 1.337
55 17.415 1.641 76 10.225 1.321
56 16.964 1.626 77 9.978 1.306
57 16.527 1.611 78 9.738 1.291
58 16.102 1.596 79 9.505 1.276
59 15.689 1.581 80 9.278 1.261
60 15.288 1.566
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