Samsung Electronics DVM Series Technical Manual page 158

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. Outdoor unit
6. Refrigerant system diagram
(3) Main parts
1) Digital scroll compressor
The variable capacity compressor shall control the unit capacity from 10% to 100%, utilizing 19 separate
capacity steps.
2) Accumulator
This shall prevent the return of liquid refrigerant to the compressor.
3) Liquid receiver
This shall reduce the unit noise level, and also shall allow control of the flow of high pressure liquid
refrigerant to the individual indoor units.
4) Solenoid valve (PWM)
This valve shall be installed at the top of the digital scroll compressor and shall be used to provide capacity
control of the compressor. When the valve is open the compressor is in its unloaded state.
5) Solenoid valve (HGBV)
Should the suction pressure in the unit fall this valve shall open. The valve shall also be used to equalize
system pressures upon shut down and assist the compressor in starting.
6) Solenoid valve (LBV)
Should the compressor temperature rise this valve shall open to cool the compressor and maintain reliable
operation.
7) Solenoid valve (VBV)
This valve shall also assist in equalizing the system pressure upon shut down, reducing the starting load on the
compressor.
8) High pressure switch (HPS)
Shall be used to stop the system operation in the event of a high pressure situation occurring.
9) Low pressure switch (LPS)
Shall be used to prevent system operation should the system pressure fall below a preset limit (20 Psig)
10) Discharge temperature sensor (DTS)
Shall be used to measure the temperature of the discharge gas from the digital scroll compressor.
11) Condenser Mid point temperature sensor (CMS)
Shall be used to measure condenser coil temperature to provide control of the condenser fan motor
and head pressure.
12) Condenser outlet sensor (COS)
Shall be used to measure the temperature of the liquid refrigerant leaving the condenser coil.
13) Outdoor air temperature sensor (OATS)
Shall be used to measure the outdoor air temperature.
14) Fixed capacity scroll compressor
Shall be used whenever the system load exceeds 50% in a two compressor unit.
15) Fixed discharge temperature sensor (FDTS)
Shall be used to measure the temperature of the discharge gas leaving the fixed capacity scroll compressor.
16) Low pressure sensor (LPSO)
By measuring the low pressure, any abnormal system status is determined and the low-pressure
protection control is performed.
17) High pressure sensor (HPSO)
By measuring the high pressure, any abnormal system status is determined and the high-pressure
protection control is performed.
18) Oil separator
This device recovers oils emitted from the compressor and returns it to the compressor again.
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