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Introduction
2. Heating
The refrigerant (R410A) coming out of the compressors flows into the indoor heat exchanger after passing
through the oil separator and the reversing valve. Dissipating heat to the room, the refrigerant condenses into
a liquid in the indoor heat exchanger.
After that, the refrigerant reduces its pressure at the indoor electronic expansion valve. The refrigerant then
passes through the subcooling heat exchanger and flows to two destinations: the outdoor heat exchanger
through the outdoor heat exchanger liquid flow control valve, and the sub heat exchanger through the sub heat
exchanger liquid flow control valve. These two valves further reduce refrigerant pressure. At the outdoor heat
exchanger the refrigerant evaporates by absorbing heat from the outside air, while at the sub heat exchanger
it evaporates by absorbing heat from the engine exhaust. The refrigerant from the outdoor heat exchanger
flows through the reversing valve and is mixed with the refrigerant from the sub heat exchanger before flowing
into the accumulator and returning to the compressors.
 8 TON
Outdoor heat exchanger
THO
THG
Sub heat exchanger
THL
Check valve for liquid pipe
Fusible plug
Strainer (for liquid)
Sub heat exchanger
liquid flow control valve
SOT
Reversing valve
Hot gas bypass valve
PSH1
HLSW1
Buffer
Oil separator
High pressure service port
Dryer filter
Oil bypass control valve
Strainer
(for vapor)
Strainer
(for vapor)
Electromagnetic compressor
capacity valve 1
C/P T2
C/P T1
C/P2
C/P1
The compressor capacity control valve
bypasses the refrigerant to reduce the refrigerant
amount in the refrigerant system during
low-load operation.
AOT
C/P S
Low pressure service port
P
S
L
Accumulator
Strainer (for vapor)
Strainer (for liquid)
ILT
Stop valve (for liquid)
Stop valve (for vapor)
Supercooling
heat exchanger
Supercooling
valve
Strainer
(for liquid)
Electronic expansion valve
Indoor heat exchanger liquid
pipe temperature sensor
Intake air temperature sensor
Indoor heat exchanger
Indoor heat exchanger vapor pipe
temperature sensor
shows the refrigerant flow direction
Electromagnetic compressor
capacity valve 2
Outdoor heat exchanger
liquid flow control valve
Fusible plug
C/P : Compressor
AOT Accumulator outlet temperature sensor PSH1 Refrigerant high pressure sensor 1
C/P S Compressor intake temperature sensor PSL Refrigerant low pressure sensor
C/P T1
Compressor discharge pipe temperature
sensor 1
SOT
Sub heat exchanger liquid temperature
sensor
C/P T2
Compressor discharge pipe temperature
sensor 2
THG
Outdoor heat exchanger vapor tempera-
ture sensor
HLSW1 Refrigerant high pressure switch 1 THL
Outdoor heat exchanger liquid tempera-
ture sensor
ILT Outdoor liquid pipe temperature sensor THO Outside air temperature sensor
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