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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
14
Refrigerant Circuit
Table 20 —Refrigerant Circuit Description
A210242
Fig. 21 —Refrigerant Circuit Diagram
Name Symbol Major Function
Inverter compressor INV Used to vary the refrigerant flow rate by adjusting the frequency based on capacity requirement
Oil separator O/S Used to separate oil from high pressure gas refrigerant, which is pumped out from the compressor
4-way valve ST1 Switches the operation mode between heating and cooling
Heat exchanger HEX Transfers heat with outside surroundings
Inverter fan FAN Regulates the heat exchanger capacity by adjusting rotating speeds
Electronic expansion valve EEV Used to adjust refrigerant flow rate
Gas/liquid separator ACC Used to separate gas refrigerant to prevent liquid slugging
Solenoid valve
SV4 Used to control the amount of oil from the oil separator back to the inverter compressor
SV5 Bypasses hot gas from compressor discharge in heating mode
SV6 Used to cool down compressor by spraying liquid refrigerant when discharge temperature > 199°F
Thermistor
T3 Used to detect pipe temperature on heat exchanger
T4 Used to detect ambient temperature
T5 Used to detect discharge pipe temperature
Fusible plug FP This plug is going to melt at a temperature of 158°F to 167°F when fire occurs
High pressure sensor P-Sensor Used to detect high pressure
High pressure switch HPS Prevents abnormal increase of high pressure, which will activate at 638 psi and shut down compressor
Low pressure switch LPS Prevents abnormal decrease of low pressure, which will activate at 20.3 psi and shut down compressor
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