Key components:
1. Oil separator:
Separates oil from gas refrigerant pumped out of the compressor and quickly returns it to the compressor. Separation
efficiency is up to 99%.
2. Accumulator:
Stores liquid refrigerant and oil to protect compressor from liquid hammering.
3. Electronic expansion valve (EXV):
Controls refrigerant flow and reduces refrigerant pressure.
4. Four-way valve:
Controls refrigerant flow direction. Closed in cooling mode and open in heating mode. When closed, the heat exchanger
functions as a condenser; when open, the heat exchanger functions as an evaporator.
5. Solenoid valve SV2:
Protects the compressor. If compressor discharge temperature rises above 98°C, SV2 opens and sprays a small amount
of liquid refrigerant to cool the compressor. SV2 closes again once the discharge temperature has fallen below 85°C.
6. Solenoid valve SV4:
Returns oil to the compressor. Opens once the compressor has run for 200 seconds and closes 600 seconds later and
then opens for 3 minutes every 20 minutes.
7. Solenoid valve SV7:
Allows refrigerant return to the compressor directly. Opens when indoor air temperature is close to the set temperature
to avoid frequent compressor on/off.
8. High and low pressure switches:
Regulate system pressure. When system pressure rises above the upper limit or falls below the lower limit, the high or
low pressure switches turn off, stopping the compressor. After 5 minutes, the compressor restarts.
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