Thermo King T-500R Maintenance Manual page 51

Solenoid and Check Valves (UT-Series)
1. Condenser Inlet Solenoid (CIS)-Open/ De-energized
2. Liquid Injection Solenoid (LIS)-Closed/ De-energized but the microprocessor will open it if necessary to control compressor
temperature.
3. Condenser Check Valve-Open
4. Purge Valve (PV)-Closed/De-energized
5. Hot Gas Solenoid (HGS)-Closed/ De-energized
1
4
5
2
3
Cool Mode UT-Series
Solenoid and Check Valves (T-500R/T-Dairy)
1. Condenser Inlet Solenoid (CIS)-Open/ De-energized
2. Condenser Check Valve-Open
3. Receiver Tank Pressure Check Valve-Closed
4. Purge Valve (PV)-Closed/De-energized
5. Purge Check Valve-Closed
6. Hot Gas Solenoid (HGS)-Closed/ De-energized
Unit Description 5-17