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7
REFRIGERANT SYSTEM DIAGRAM
PUHZ-W50VHA2
PUHZ-W50VHA2-BS
Water OUT
Plate HEX
TH32
Water IN
TH6
Symbol
COMP
Compressor
H/P SW
High pressure switch (63H)
Plate HEX
Plate Heat Exchange
REV/V
Reversing (4-way) valve (21S4)
CHECK/V
Check valve
P-Sensor
Pressure sensor (63HS)
P/B
Power board
LEV-A
Linear expansion valve-A
LEV-B
Linear expansion valve-B
TH32
Inlet water temperature thermistor
TH3
Liquid temperature thermistor
TH4
Discharge temperature thermistor
TH6
Plate HEX liquid temperature thermistor
TH7
Ambient temperature thermistor
TH8
Heat sink temperature thermistor
TH34
Comp.surface temperature thermistor
Receiver
Receiver
OCH605A
PUHZ-W50VHA2R1
PUHZ-W50VHA2R1-BS
CHECK/V
REV/V
CHECK/V
Receiver
Strainer
(#100)
LEV-B
Strainer(#100)
Part name
DC inverter twin rotary compressor (Mitsubishi Electric Corporation)
For protection (OFF:4.15 MPa)
MWA1-28LM (MITSUBISHI)
Change the refrigerant circuit (Heating/Cooling) and for Defrosting
High pressure/Low pressure/For production test use
For calculation of the condensing temperature from high pressure
Inverter power board
Heating: Secondary LEV
Heating: Primary LEV
For freeze protection and for compressor frequency control
Heating: Evaporating temperature
For LEV control and for compressor protection
Heating:Sub cool liquid temperature
For fan control and for compressor frequency control
For power board protection
For compressor protection
For accumulation of refrigerant
P-Sensor
CHECK/V
H/P SW
TH34
TH4
TH8
Strainer
(#100)
COMP
LEV-A
Strainer(#100)
Detail
Cooling: Primary LEV
Cooling: Secondary LEV
Cooling: Sub cool liquid temperature
12
TH7
TH3
Distributor
P/B
Refrigerant flow in heating
Refrigerant flow in cooling
Cooling: Evaporating temperature
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