Refrigerant Circuit - Carrier 38VMH-1P Service Manual

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Refrigerant Circuit

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