235 of 282
M-SV-001-EN Rev. G
2. Remove the Service Side Cover. Refer to "4.2.3.1 Service Side Cover Removal and Installation"
on page 58.
3. Disconnect the pressure/temperature cable clip (SUCTION – J18 or DISCHGE – J19) from the
Backplane board. Refer to "Figure 4-303 Pressure/Temperature Cable Terminals" for this and the
following step.
4. Using a multimeter set for resistance measurements, place leads on Terminal 1 and Terminal 2
of the pressure/temperature cable clip.
• The temperature sensor is a 10KΩ @ 77°F (25°C) NTC thermistor. The resistance value
should correspond to "Figure 4-302 Temperature vs. Resistance".
Figure 4-302 Temperature vs. Resistance
Figure 4-303 Pressure/Temperature Cable Terminals
5. If the integrity of the cable is in question, disconnect the compressor controller cable from the
pressure/temperature sensor and proceed to the next step.
6. Place the leads on Terminal 1 & 3 of the pressure/temperature sensor. Refer to "Figure 4-304
Pressure/Temperature Sensor Pin Locations".
To verify pressure reading, compare the readout of the service monitoring software to a calibrated
gauge. Discharge pressure reading should be within 50 kPa (7.25 psig). Suction pressure reading
should be within 17 kPa (2.5 psig).
• The temperature sensor is a 10KΩ @ 77°F (25°C) NTC thermistor. The resistance value should
correspond to "Figure 4-302 Temperature vs. Resistance" on page 235.
Figure 4-304 Pressure/Temperature Sensor Pin Locations
5
10
15
20
25
30
0 5 10 15 20 25 30 35 40
Temperature vs. Resistance
Ω (X 1,000)
Temp (deg C)
Temp (deg F)
32
41
50 59 68
77
86 95 104
Pin 1
Pin 4
Pin 3
Pin 2
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