19
OCH727
8
REFRIGERANT SYSTEM DIAGRAM
PUZ-WM50VHA.UK
PUZ-WM50VHA-BS.UK
Distributor
TH7
Strainer4(#100)
Strainer1(#100)
Receiver
LEV-B
TH34
Plate HEX
Water IN
Water OUT
Strainer3
(#100)
TH3
CHECK/V(C)
CHECK/V(L)
CHECK/V(H)
H/P SW
TH4
TH8
P/B
LEV-A
COMP
REV/V
P-Sensor
Strainer2
(#100)
TH33
TH6
PRV
Heat exchanger
Refrigerant flow in heating
Refrigerant flow in cooling
Symbol
Part name
Detail
COMP
Compressor
DC inverter twin rotary compressor (Mitsubishi Electric Corporation)
H/P SW
High pressure switch (63H)
For protection (OFF: 4.15MPa)
REV/V
Reversing (4-way) valve (21S4)
Change the refrigerant circuit (Heating/Cooling) and for Defrosting
CHECK/V Check valve
(H): High pressure/(L): Low pressure/(C): For production test use
P-Sensor
Refrigerant pressure sensor (63HS)
For calculation of the saturation temperature from refrigerant pressure
P/B
Power circuit board
Inverter power board
LEV-A
Linear expansion valve -A
Heating: Secondary LEV Cooling: Primary LEV
LEV-B
Linear expansion valve -B
Heating: Primary LEV Cooling: Secondary LEV
TH3
Liquid temperature thermistor
Heating: Evaporating temperature Cooling: Sub cool liquid temperature
TH4
Discharge temperature thermistor
For LEV control and for compressor protection
TH6
2-phase pipe temperature thermistor
Heating: Evaporating temperature Cooling: Condensing temperature
TH7
Ambient temperature thermistor
For fan control and for compressor frequency control
TH8
Heat sink temperature thermistor
For power board protection
TH33
Comp.surface temperature thermistor
For compressor protection
TH34
Plate HEX liquid temperature thermistor
Heating: Sub cool liquid temperature Cooling: Evaporating temperature
Receiver
Receiver
For accumulation of refrigerant
Plate HEX Plate Heat Exchanger
MWA1-28HM (Mitsubishi Electric Corporation)
PRV
Pressure relief valve
For water pressure protection (Discharge: 3bar)
