Mitsubishi Electric PUZ-WZ50VAA Service Manual page 29

8 REFRIGERANT SYSTEM DIAGRAM
PUZ-WZ50VAA.UK
PUZ-WZ50VAA-BS.UK
PRV2
AAV
PRV1
Water OUT
P.HEX
Water IN
Symbol
INV. Comp Compressor
H/P SW High pressure switch (63H)
REV/V Reversing (4-way) valve (21S4)
Check/V Charge plug
P-Sensor Refrigerant 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
TH8 Heat sink temperature thermistor
TH33 Comp. surface temperature thermistor
TH34 Plate HEX liquid temperature thermistor Heating: Sub cool liquid temperature Cooling: Evaporating temperature
T-protector Thermal protector
P.V. Pressure Vessel
HIC Heat inner exchanger
P/B Power circuit board
P. HEX Plate Heat Exchanger
PRV1/2 Pressure relief valve
AAV Air separator (Auto air vent)
OCH816
PUZ-WZ60VAA.UK
PUZ-WZ60VAA-BS.UK
P-Sensor
Check/V(L)
TH34
LEV-B
Strainer1
Strainer2
Parts name
HP. SW
Check/V(H)
REV/V
Muffler1
TH4
INV. COMP
HIC1
Pressure Vessel
DC inverter scroll compressor (Mitsubishi Electric Corporation)
For protection (OFF: 3.20MPa)
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
Heating: Secondary LEV Cooling: Primary LEV
Heating: Primary LEV Cooling: Secondary 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 protection
For compressor protection
For accumulation of refrigerant
For compressor protection
Inverter power board
MWA1-28DM (Mitsubishi Electric Corporation)
For water pressure protection and for protection of refrigerant leakage into
the indoor (Discharge: 3bar)
For air venting and for protection of refrigerant leakage into the indoor
29
HEX TH6 TH7
TH33
TH8 P/B
T-Protector
LEV-A
Strainer4
Strainer3
Refrigerant flow in heating
Refrigerant flow in cooling
Detail
Cooling: Sub cool liquid temperature
Cooling: Condensing temperature
TH3