Unit Description
36
Heat/Defrost Mode
The refrigerant flow in Heat/Defrost Mode is a
conventional hot gas heat cycle. The CIS is closed
and the HGS is open so high pressure refrigerant
vapor leaves the compressor and flows through
the DPR (which maintains a minimum discharge
pressure) and the HGS to the hot has line. Most of
the refrigerant flows through the hot gas line and
the drain pan heater to the evaporator. There, the
refrigerant heats the evaporator and returns to the
compressor through the heat exchanger,
accumulator, and SPR (or ETV). Some of the
refrigerant flows through the receiver tank
pressure check valve and forces any liquid
refrigerant out of receiver tank through the drier,
heat exchanger, and expansion valve to the
evaporator. From which it returns to the
compressor through the heat exchanger, and
accumulator.
Solenoid and Check Valves
1. Condenser Inlet Solenoid (CIS)-Closed/
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-Closed
4. Receiver Tank Pressure Check Valve-Open
5. Purge Valve (PV)-Open/Energized
6. Purge Check Valve-Closed
7. Hot Gas Solenoid (HGS)-Open/Energized
Figure 9: Heat/Defrost Mode
1
2
3
4
5
6
7
Содержание UT-1200
Страница 10: ...Table of Contents 10...
Страница 20: ...Safety Precautions 20...
Страница 76: ...Operating Instructions for Premium HMI Control Panel 76...
Страница 88: ...Electrical Maintenance 88...
Страница 98: ...Engine Maintenance 98 Figure 167 Fuel Components...
Страница 142: ...Refrigeration Service Procedures 142...
Страница 148: ...Clutch Maintenance 148...
Страница 150: ...Structural Maintenance 150...
Страница 162: ...Wiring and Schematic Diagrams Index 162...
Страница 163: ...163 Schematic Diagram Page 1 of 2...
Страница 164: ...164 Schematic Diagram Page 2 of 2...
Страница 165: ...165 Wiring Diagram Page 1 of 5...
Страница 166: ...166 Wiring Diagram Page 2 of 5...
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