Thermo King T-500R Maintenance Manual page 49

1. Scroll Compressor
2. Compressor Temperature Sensor
3. Compressor Sight Glass
4. Liquid Injection Solenoid (LIS)
5. High Pressure Cutout Switch (HPCO)
6. Discharge Service Port
7. Condenser Inlet Solenoid (CIS)
8. Condenser Coil
9. High Pressure Relief Valve
10. Receiver Tank Outlet Valve
11. Receiver Tank Sight Glass
12. Dehydrator (Filter-Drier)
13. Heat Exchanger
Cool Mode
The refrigerant flow in Cool Mode is a conventional refrigeration cycle. High pressure refrigerant vapor leaves the compressor
and flows through the open CIS to the condenser where the refrigerant releases heat and condenses into high pressure liquid. The
liquid refrigerant flows through the condenser check valve, receiver tank, drier, heat exchanger, and the expansion valve into the
evaporator. There, liquid refrigerant absorbs heat as it evaporates into low pressure vapor. The refrigerant returns to the
compressor through the heat exchanger, accumulator, (and ETV - T-Series or SPR in T-500R/T-Dairy).
Refrigeration System Components UT-Series
14. Expansion Valve
15. Distributor
16. Evaporator Coil
17. Drain Pan Heater
18. Accumulator
19. Mechanical Throttle Valve
20. Suction Service Valve
21. Suction Pressure Transducer
22. Hot Gas Solenoid (HGS)
23. Discharge Pressure Regulator (DPR)
24. Purge Valve (PV)
25. Condenser Check Valve
Unit Description 5-15