AAON RSMD2R User Manual

27
RSMD2R Technical Guide
TROUBLESHOOTING
Temperature Sensor Testing
Thermistor Sensor Testing Instructions
Use the resistance column to check the thermistor sensor while
disconnected from the controllers (not powered).
Use the voltage column to check sensors while connected to
powered controllers. Read voltage with meter set on DC volts.
Place the “-” (minus) lead on GND terminal and the “+” (plus)
lead on the sensor input terminal being investigated.
If the voltage is above 4.88 VDC, then the sensor or wiring is
“open.” If the voltage is less than 0.05 VDC, then the sensor or
wiring is shorted.
Sensor Voltage and Resistance
The following sensor voltage and resistance table is provided to
aid in checking sensors that appear to be operating incorrectly.
See Table 5, below. Many system operating problems can be
traced to incorrect sensor wiring. Be sure all sensors are wired
per the wiring diagrams in this manual.
If the sensors still do not appear to be operating or reading
correctly, check voltage and/or resistance to conrm that the
sensor is operating correctly per the tables. Please follow the
notes and instructions that appear after the chart when checking
sensors.
Table 6: 0-5V Temperature Sensor - Voltage & Resistance for Type III Sensors
Temperature – Resistance – Voltage for Type III 10 K Ohm Thermistor Sensors
Temp
(ºF)
Temp
(ºC)
Resistance
(Ohms)
Voltage @
Input (VDC)
Temp
(ºF)
Temp
(ºC)
Resistance
(Ohms)
Voltage @
Input
(VDC)
-10 -23.3 93333 4.51 72 22.2 11136 2.635
-5 -20.6 80531 4.45 73 22.8 10878 2.605
0 -17.8 69822 4.37 74 23.3 10625 2.576
5 -15 60552 4.29 75 23.9 10398 2.549
10 -12.2 52500 4.2 76 24.4 10158 2.52
15 -9.4 45902 4.1 77 25 10000 2.5
20 -6.6 40147 4.002 78 25.6 9711 2.464
25 -3.9 35165 3.891 80 26.7 9302 2.41
30 -1.1 30805 3.773 82 27.8 8893 2.354
35 1.7 27140 3.651 84 28.9 8514 2.3
40 4.4 23874 3.522 86 30 8153 2.246
45 7.2 21094 3.39 88 31.1 7805 2.192
50 10 18655 3.252 90 32.2 7472 2.139
52 11.1 17799 3.199 95 35 6716 2.009
54 12.2 16956 3.143 100 37.8 6047 1.884
56 13.3 16164 3.087 105 40.6 5453 1.765
58 14.4 15385 3.029 110 43.3 4923 1.65
60 15.6 14681 2.972 115 46.1 4449 1.54
62 16.7 14014 2.916 120 48.9 4030 1.436
64 17.8 13382 2.861 125 51.7 3656 1.339
66 18.9 12758 2.802 130 54.4 3317 1.246
68 20 12191 2.746 135 57.2 3015 1.159
69 20.6 11906 2.717 140 60 2743 1.077
70 21.1 11652 2.691 145 62.7 2502 1.001
71 21.7 11379 2.661 150 65.6 2288 0.931

AAON RSMD2R Specifications

General

Brand	AAON
Model	RSMD2R
Category	Control Unit
Language	English