V6R VRF 50Hz
18
Midea V
6
R
Series S
er
vice M
anual
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.
Gas-liquid separator:
Separates liquid refrigerant from gas refrigerant, stores liquid refrigerant and oil to protect compressor from liquid
hammering.
3.
Electronic expansion valve (EEV):
Controls refrigerant flow and reduces refrigerant pressure.
4.
Four-way valve:
Controls heat exchanger function. When open, the heat exchanger functions as an evaporator; When closed, the heat
exchanger functions as a condenser. Refer to part 3, “Heat Exchanger Control”.
5.
Plate heat exchanger:
In cooling mode, it can improve super-cooling degree and the super-cooled refrigerant can achieve better heat exchange
in indoor side. In heating mode, the refrigerant comes from the plate heat exchanger going to the compressor can
enhance the refrigerant enthalpy and improve the heating capacity in low ambient temperature. Refrigerant volume in
plate heat exchanger is controlled according to temperature different between plate heat exchanger inlet and outlet or
the temperature different between discharge temperature and target discharge temperature.
6.
Solenoid valve SV5:
Controls the refrigerant from plate heat exchanger to gas-liquid separator.
7.
Solenoid valve SV7:
Bypass pressure at start-up stage and control capacity at low load condition; High-pressure-rise prevention; Discharge
superheat protection.
8.
Solenoid valve SV8A
Allows refrigerant from plate heat exchanger inject directly to the compressor. SV8A opens when compressor startup
and closes when compressor stop.
9.
High pressure switch
Regulate system pressure. When system pressure rises above the upper limit, the high pressure switch turn off, stopping
the compressor. When the high pressure protection recovers, the compressor restarts.
