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Refrigerant System Diagram - Mitsubishi Electric PUHZ-SW50VHA Service Manual

Split-type, air to water heat pump
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9

REFRIGERANT SYSTEM DIAGRAM

PUHZ-SW40VHA
PUHZ-SW40VHA-BS
PUHZ-SW50VHA
PUHZ-SW50VHA-BS
Stop valve
(with service port)
Refrigerant GAS pipe
connection ø12.7(1/2F)
Linear
expansion valve B
Stop valve
Refrigerant LIQUID pipe
connection ø6.35(1/4F)
Symbol
Part name
COMP
Compressor
H/P SW
High pressure switch (63H)
REV/V
Reversing (4-way) valve (21S4)
Charge plug
Charge plug
P-Sensor
High pressure sensor (63HS)
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
TH34
Comp.surface temperature thermistor
Power Receiver
Power Receiver
OCH525C
PUHZ-SW40VHAR1
PUHZ-SW40VHAR1-BS
PUHZ-SW50VHAR1
PUHZ-SW50VHAR1-BS
Solenoid valve
(Four-way valve)
Strainer
#50
Power
receiver
Strainer
#100
DC inverter twin rotary compressor (Mitsubishi Electric Corporation)
For protection (OFF: 4.15MPa)
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
Heating: Secondary LEV
Heating: Primary LEV
Heating: Evaporating temperature
For LEV control and for compressor protection
Outdoor 2-phase pipe temperature
For fan control and for compressor frequency control
For compressor protection
For accumulation of refrigerant
17
PUHZ-SW50VKA
PUHZ-SW50VKA-BS
High pressure sensor
(63HS)
Charge plug
High pressure
switch 63H
Thermistor TH4
(Discharge)
Thermistor TH34
(Comp. surface)
Compressor
Linear expansion valve A
Strainer
#100
Detail
Cooling: Primary LEV
Cooling: Secondary LEV
Cooling: Sub cool liquid temperature
Unit: mm (in)
Thermistor TH7
Heat exchanger
(Ambient)
Thermistor TH6
(2-phase pipe)
Thermistor TH3
(Liquid)
Distributor
Refrigerant flow in cooling
Refrigerant flow in heating

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