Samsung Electronics DVM Series Technical Manual page 162

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. Outdoor unit
6. Refrigerant system diagram
13) 4 Way valve (4-W/V)
This shall control the direction of the refrigerant flow, allowing operation in both cooling
and heat pump mode.
14) Electronic expansion valve (EEV)
This shall control the flow of refrigerant in the heat pump mode. The valve shall sense
the suction line temperature and pressure and adjust accordingly for optimum performance.
15) Check valve (C/V)
This valve shall be used to allow the bypass of refrigerant around the EEV when the unit is in the
cooling mode.
16) Suction lint temperature sensor (SUCS)
This shall measure the suction line temperature and be used to control the Electronic Expansion Valve.
17) Oil temperature sensor (OILS)
This sensor shall measure the oil temperature to prevent oil dilution by liquid refrigerant flooding
back to the compressor.
18) Fixed discharge temperature sensor (FDTS)
Shall be used to measure the temperature of the discharge gas leaving the fixed capacity scroll compressor.
19) Low pressure sensor (LPSO)
By measuring the low pressure, any abnormal system status is determined and the low-pressure
protection control is performed.
20) High pressure sensor (HPSO)
By measuring the high pressure, any abnormal system status is determined and the high-pressure
protection control is performed.
21) Oil separator
This device recovers oils emitted from the compressor and returns it to the compressor again.
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