Midea ATOM B Series - 2 Refrigerant Flow Diagrams

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