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Cycle Diagram; Refrigerant Cycle - LG THERMA V Air-to-Water Heat Pump Installation Manual

Therma v air-to-water heat pump.
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General Information

Cycle Diagram

Refrigerant Cycle(Non-Vapor Injection)
Description
Category
Symbol
Th1
Indoor Unit
Th2
Th3
Th4
Th5
Th6
Outdoor Unit
Th7
Th8 *1
EEV
*1:Applied Model : AHUW128A1, AHUW148A1, AHUW168A1, AHUW096A1, AHUW126A1, AHUW146A1, AHUW166A1
Refrigerant Cycle(Vapor Injection)
Description
Category
Symbol
Th1
Indoor Unit
Th2
Th3
Th4
Th5
Th6
Outdoor Unit
Th7
Th8
EEV
16 Air-to-Water Heat Pump
INDOOR UNIT
LIQUID SIDE
3-Way
Service Valve
Th2
Indoor Unit
Plate Heat
Exchanger
Th3
GAS SIDE
3-Way
Service Valve
Meaning
Remote air temperature sensor
Inlet evaporator temperature sensor
Outlet evaporator temperature sensor
Compressor-suction pipe temperature sensor
Compressor-discharge pipe temperature sensor
Condenser temperature sensor
Outdoor air temperature sensor
Condenser middle temperature sensor
Electronic Expansion Valve
INDOOR UNIT
LIQUID SIDE
3-Way
Service Valve
Th2
Indoor Unit
Plate Heat
Exchanger
Th3
GAS SIDE
3-Way
Service Valve
Meaning
Remote air temperature sensor
Inlet evaporator temperature sensor
Outlet evaporator temperature sensor
Compressor-suction pipe temperature sensor
Compressor-discharge pipe temperature sensor
Condenser temperature sensor
Outdoor air temperature sensor
Condenser middle temperature sensor
Electronic Expansion Valve
OUTDOOR UNIT
EEV
Outdoor Unit
Heat Exchanger
Low Pressure
Switch
Th4
Reversing Valve
Accumulator
Th5
High Pressure
COMPRESSOR
Switch
PCB
Connector
- Optional accessory (being sold separately)
CN_ROOM
- Not shown in diagram
- Meaning is expressed based on Cooling
CN_PIPE
CN_PIPE/O
CN_TH3
- Th4 and Th5 are connected at 4 pin type
CN_TH3
- Description is expressed based on Cooling
CN_TH2
- Th6 and Th7 are connected at 4 pin type
CN_TH2
CN_TH3
CN_LEV1
OUTDOOR UNIT
EEV
EEV
Phase,
Separator
Outdoor Unit
Heat Exchanger
Low Pressure
Switch
Th4
Reversing Valve
Accumulator
Th5
High Pressure
COMPRESSOR
Switch
PCB
Connector
CN_ROOM
CN_PIPE
CN_PIPE/O
CN_TH3
CN_TH3
CN_TH2
CN_TH2
CN_TH3
CN_LEV1
CN_LEV2
CN_LEV3
Th6
Th7
Th8
COOLING
HEATING
Remarks
mode.
connector CN_TH3.
mode.
connector CN_TH2
- Th8 is connected at 4 pin type connector CN_TH3
Th6
Th7
Th8
COOLING
HEATING
Remarks
- Optional accessory (being sold separately)
- Not shown in diagram
- Meaning is expressed based on Cooling mode.
- Th4 and Th5 are connected at 4 pin type connector
CN_TH3.
- Description is expressed based on Cooling mode.
- Th6 and Th7 are connected at 4 pin type connector
CN_TH2
- Th8 is connected at 4 pin type
connector CN_TH3
- Adjusting mass flow rate of circulating
refrigerant or injecting refrigerant

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