Atom B Series VRF 50/60Hz
19
Part 2 - Outdoor Unit Engineering Data
Figure 2-4.2: 42 model Piping diagram
Figure 2-4.3: 48/56 model Piping diagram
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.
High pressure
switch
Temperature
sensor
Distributor
Liquid pipe
Temperature
sensor
4 way valve
DC motor
Gas pipe
Compressor
Temperature
sensor
Low pressure switch
Accumulator
Refrigerant
radiator
module
Temperature sensor
Oil return capiliary
Oil seperator
Filter
Electronic
expansion
valve
High pressure
switch
Temperature
sensor
Distributor
Liquid pipe
Temperature
sensor
4 way valve
DC motor
Gas pipe
Compressor
Temperature
sensor
Low pressure switch
Accumulator
Refrigerant
radiator
module
Temperature sensor
Oil return capiliary
Oil seperator
Filter
Electronic
expansion
valve
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