Samsung AVMKH020EA4 Service Manual page 164

I Main parts status
11. Digital scroll compressor
The variable capacity type compressor to control the capacity up to 10 ~ 100% with 19 steps.
12. Accumulator
To prevent the incoming of the liquid refrigerant to the compressor (prevention of liquid back).
13. Receiver
To reduce the noise by flowing the high pressure liquid refrigerant to the high pressure pipe and to control the amount of
refrigerant during the individual operation of indoor unit.
14. Solenoid valve (PWM)
It is installed at the top of digital scroll compressor and at the low pressure pipe, which is used for operating the digital scroll
compressor. When the valve is open, the digital scroll compressor keeps the state of unloading.
15. Solenoid valve (HGBV:Hot Gas Bypass Valve)
When the low pressure gets lower, the valve is open by the low pressure safety device.
The valve is open in order to reduce the load at the start of compressor and when the system stops and then keep the
balance of low pressure.
16. Solenoid valve (LBV:Liquid Bypass Valve)
When the compressor is overheated, it actuates to lower the temperature of compressor for stable operation.
17. High pressure switch (HPS)
To stop the system for the system protection when the high pressure exceeds the set value.
18. Low pressure switch (LPS)
To stop the system for the system protection when the low pressure doesn't exceeds the set value.
19. Temperature sensor (DTS, Discharge Temperature Sensor)
It is the means to measure the refrigerant temperature of compressor outlet which is used as the data for control of
compressor.
10. Temperature sensor (COS, Condenser Out Sensor)
When heating, used for defrost control by sensing outdoor heat exchanger temperature.
11. Temperature sensor (OATS, Outdoor Air Temperature Sensor)
To measure the outdoor temperature which is used for the determination of start method.
12. 4-Way valve (4-W/V)
It enables the change between cooling and heating by reversing the flow direction of refrigerant.
13. Electronic expansion valve (EEV)
By sensing suction temperature and low pressure, controls the suction super heat and mass flow of refrigerant in heating
mode.
Samsung Electronics
Circuit Descriptions
8-10