73(96)
1) The high and low pressure controllers are used to control the working
pressure of the compressor suction port and outlet port.
2) The pressure of the high pressure controller is set to 37 bar, and pressure of
the low pressure controller is set to 4 bar.
3) Give an alarm when the pressure of the compressor outlet port is higher than
37 bar or the pressure of the compressor suction port is lower than 4 bar.
Picture 2-32：High and Low Pressure Controller
2.2.53.7 Refrigerant Indicator (optional)
Picture 2-33：Refrigerant Indicator
1) The refrigerant indicator is used to detect whether the refrigerant is filled
appropriately.
2) The refrigerant indicator is used to detect the water ratio of the system.
3) The refrigerant indicator is installed infront of expansion valve.
2.2.53.8 Solenoid Valve (optional)
Picture 2-34：Solenoid Valve
1) Solenoid valve is used to cut the refrigerant supply immediately after the
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