Midea ATOM MDV-V28WDHN1 Manual page 20

Figure 2-4.2: 42 model Piping diagram
Low pressure switch
Compressor
Accumulator
Oil return capiliar y
Figure 2-4.3: 48/56 model Piping diagram
Low pressure switch
sensor
Compressor
Accumulator
Oil return capiliar y
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(ST1):
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. 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.
Gas pipe
Temperature
4 way valve
sensor
Oil seperator
High pressure
switch
Gas pipe
Temperature
4 way valve
Oil seperator
High pressure
switch
Atom B Series VRF 50/60Hz
Temperature
sensor
DC motor
Liquid pipe
Temperature
sensor
sensor
DC motor
Liquid pipe
Filter
Refrigerant
radiator
module
Temperature
sensor
Temperatu re senso r
Distributor
Electronic
expansion
valve
Filter
Refrigerant
radiator
module
Temperature
Temperatu re senso r
Distributor
Electronic
expansion
valve
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