AAON RSMD2R User Manual

26
RSMD2R Technical Guide
TROUBLESHOOTING
Copeland
®
Discharge Thermistor Temperature Sensor Testing
Copeland
®
Discharge Thermistor
Temperature Sensor Testing
The following sensor voltage and resistance table is provided to
aid in checking sensors that appear to be operating incorrectly.
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 table. Please follow the notes
and instructions the appear after the chart when checking sensors.
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 4.98 VDC, then the sensor or wiring is
“open.” If the voltage is less than 0.38 VDC, then the sensor or
wiring is shorted.
Discharge Thermistor Temperature/Resistance
Temp
(ºF)
Temp
(ºC)
Resistance
(K Ohms)
Voltage @
Input (VDC)
Temp
(ºF)
Temp
(ºC)
Resistance
(Ohms)
Voltage @
Input
(VDC)
-40 -40 2889.60 4.98 167 75 12.73 2.80
-31 -35 2087.22 4.97 176 80 10.79 2.59
-22 -30 1522.20 4.96 185 85 9.20 2.39
-13 -25 1121.44 4.95 194 90 7.87 2.19
-4 -20 834.72 4.94 203 95 6.77 2.01
5 -15 627.28 4.92 212 100 5.85 1.84
14 -10 475.74 4.89 221 105 5.09 1.68
23 -5 363.99 4.86 230 110 4.45 1.53
323 0 280.82 4.82 239 115 3.87 1.39
41 5 218.41 4.77 248 120 3.35 1.25
50 10 171.17 4.72 257 125 2.92 1.12
59 15 135.14 4.65 266 130 2.58 1.02
68 20 107.44 4.57 275 135 2.28 0.92
77 25 86.00 4.47 284 140 2.02 0.83
86 30 69.28 4.36 293 145 1.80 0.76
95 35 56.16 4.24 302 150 1.59 0.68
104 40 45.81 4.10 311 155 1.39 0.61
113 45 37.58 3.94 320 160 1.25 0.55
122 50 30.99 3.77 329 165 1.12 0.50
131 55 25.68 3.59 338 170 1.01 0.45
140 60 21.40 3.40 347 175 0.92 0.42
149 65 17.91 3.20 356 180 0.83 0.38
158 70 15.07 3.00
Table 5: Discharge Thermistor Temperature/Resistance

AAON RSMD2R Specifications

General

Brand	AAON
Model	RSMD2R
Category	Control Unit
Language	English