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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