Midea ATOM B Series Service Manual page 11

Atom B Series VRF 50/60Hz
Figure 2‐1.3: 60 model piping diagram
Low pressure
switch
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:
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.
10
Gas pipe
4 way valve
Temperature
sense
Oil seperator
Compressor
42
High pressure
switch
Silencer（Reserved）
Oil return capiliary
Temperature sense
DC motor
Liquid pipe
Filter
Refrigerant
radiator
modile
Temperature sense
Distributor
Temperature sense