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