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M-SV-001-EN Rev. G
4.24.4.3 Stator Thermistor Resistance Verification
1. Isolate the compressor power as described in Section "1.8 Electrical Isolation" on page 19.
2. Disconnect the DC supply cable harness from the motor thermistor terminals. Refer to "Figure
4-244 Connection to Stator" on page 192.
3. Using a multimeter set for resistance measurements, place the red (+) multimeter lead on one
motor thermistor terminal and the black (-) multimeter lead on the other motor thermistor
terminal. The measured value should correspond to the expected resistance (150-300Ω at 70°F
(21°C) outlined in "Figure 4-245 Stator Thermistor R/T Curve 1". If the measured value does
not correspond to the expected resistance, then the Stator thermistor is faulty and the Stator
assembly must be replaced. Due to the fact that this is not a field-serviceable component, the
compressor must be replaced.
Figure 4-245 Stator Thermistor R/T Curve 1
4.24.5 Motor Assembly Removal and Installation
This section contains steps that explain the removal and replacement of the Motor Bus Bars, Copper
Tubes, Cover Plate, and the High-Power Feed Throughs. The following steps apply to all TTS/TGS/TTH/
TGH compressors.
The TTS/TGS/TTH/TGH compressors utilize two different styles of High-Power Feedthroughs. There is a
clear physical distinction between the two styles. The Polyphenylene Sulfide (PPS) style has threaded
female ends while the stainless-steel style has threaded male ends that require brass nuts. When
necessary, the two different types will be identified.
4.24.5.1 Motor Bus Bar Removal
1. Isolate compressor power as described in Section "1.8 Electrical Isolation" on page 19.
2. Remove the Soft Start. Refer to "4.15.3 Soft Start Removal and Installation" on page 112.
3. Remove the Motor Bus Bars. If the feedthrough is PPS, hold the High-Power Feedthrough while
removing the motor bus bar fastener in order to prevent the feedthrough from rotating. If the
feedthrough is stainless-steel, hold the inner nut with a wrench while loosening the outer nut.
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