Ingersoll-Rand ReliaTel, Manual, Page: 113 / 176

RT-SVD03L-EN 113
RTRM/RTOM - Temperature Inputs
Outdoor Air Sensor, Discharge
Air Sensor, Coil Temperature
Sensor
Terminals to Read Voltage
Outdoor Air Sensor — RTRM J8-2, J8-1
Discharge Air Sensor — RTOM J4-5, J4-4
Coil Temperature Sensor 1 — RTRM J2-3, J2-4
Coil Temperature Sensor 2 — RTRM J9-2, J9-1
N No otte e:: These are RTRM, RTOM inputs only. Economizer
inputs (MAS, RAS, OHS, RHS, CO
2
) are in the
ReliaTel ™ Economizer inputs section.
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
listed above.
Service Tips
The second sensor terminal listed above is common.
All common terminals are grounded, therefore one volt
meter lead can be attached to ground for voltage tests.
To check for induced voltage, read AC voltage to
ground from each sensor wire. Should be less than 1
VAC.
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
Table 85. Temperature input
Temp °F
Resistance (K
ohms)
DC Volts
-40 345.684 4.856
-39 333.237 4.851
-38 321.274 4.845
-37 309.777 4.84
-36 298.724 4.834
-35 288.097 4.828
-34 277.879 4.823
-33 268.053 4.816
-32 258.603 4.81
-31 249.523 4.804
-30 240.81 4.797
-29 232.425 4.79
-28 224.355 4.783
-27 216.59 4.776
Table 85. Temperature input (continued)
Temp °F
Resistance (K
ohms)
DC Volts
-26 209.114 4.768
-25 201.918 4.76
-24 194.991 4.752
-23 188.32 4.744
-22 181.904 4.736
-21 175.738 4.727
-20 169.798 4.718
-19 164.076 4.709
-18 158.562 4.7
-17 153.248 4.69
-16 148.127 4.68
-15 143.192 4.67
-14 138.435 4.66
-12 129.449 4.638
-11 125.199 4.627
-10 121.1 4.615
-9 117.146 4.603
-8 113.331 4.591
-7 109.652 4.579
-6 106.102 4.566
-5 102.676 4.553
-4 99.377 4.54
-3 96.197 4.526
-2 93.127 4.512
-1 90.163 4.498
0 87.301 4.483
1 84.537 4.468
2 81.868 4.453
3 79.291 4.437
4 76.802 4.421
5 74.403 4.404
6 72.087 4.388
7 69.849 4.371
8 67.687 4.353
9 65.597 4.336
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