V5 X VRF 50/60Hz
201608 15
Part 2 - Component Layout and Refrigerant Circuits
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 100°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 90°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 SV5:
Enables fast defrosting. During defrosting operation, opens to shorten the refrigerant flow cycle and quicken the
defrosting process. Closed in cooling mode.
8. Solenoid valve SV6:
Allows refrigerant to bypass the expansion valves. Open in cooling mode when discharge temperature exceeds the
limit. Closed in heating mode or standby.
9. 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 10 minutes, the compressor restarts.
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