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M-SV-001-EN Rev. G
Figure 4-32 Compressor Cooling Solenoid Coil Cable Connector
4.7.3.2 Output Voltage to Solenoid Coils
1. Remove the Service Side Cover. Refer to "4.2.3.1 Service Side Cover Removal and Installation"
2. The compressor must be running and make a call to enable the cooling solenoid coils for the
LEDs to turn on. The SMT Cooling Mode will indicate "inverter," "motor," or "motor and inverter"
when the software is sending the signal to the coils.
3. To ensure the Serial Driver is providing power to the solenoids, look for the Cool-L and Cool-H
LEDs on the Backplane. Refer to "Figure 4-33 Backplane - Cool LEDs and +24V Test Points".
4. To determine if 24VDC is present at one or both solenoid coils, use a multimeter to test the
back sides of pins 1 & 3 and pins 5 & 6 of the cooling solenoid coils WHILE they are energized.
Refer to "Figure 4-32 Compressor Cooling Solenoid Coil Cable Connector".
Figure 4-33 Backplane - Cool LEDs and +24V Test Points
4.7.3.3 Cooling Path Blockage Inspection
1. Isolate compressor power as described in Section "1.8 Electrical Isolation" on page 19.
2. Isolate the compressor and recover the refrigerant according to industry standards. Refer to
"3.1 Refrigerant Containment" on page 41.
3. Remove the actuators, solenoids, and orifices.
4. Remove the Liquid Line connection from the compressor and inspect the strainer.
5. Ensure that the cooling paths are clean, as shown in "Figure 4-34 Solenoid Cooling Path
Figure 4-34 Solenoid Cooling Path - TTS300/TGS230
1
2
3
4
5
6
+24 Test Point
Cool-L & Cool-H
LEDs
Cooling Paths
Summary of Contents for Turbocor TTS Series
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