Mitsubishi Electric PUZ-WZ50VAA Service Manual page 30

PUZ-WZ80VAA.UK
AAV
Water OUT
P.HEX
Water IN
Symbol
INV. Comp Compressor
FIX. Comp Compressor
H/P SW1 High pressure switch (63H)
H/P SW2 High pressure switch (63L)
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
LEV-C Linear expansion valve -C
TH3 Liquid temperature thermistor
TH4 Discharge temperature thermistor
TH6 2-phase pipe temperature thermistor
TH7 Ambient temperature thermistor
TH8 Heat sink temperature thermistor
TH32 Liquid temperature thermistor
TH33 Comp.surface temperature thermistor
TH34 Plate HEX liquid temperature thermistor
TH35 Suction pipe temperature thermistor
T-protector Thermal protector
P.V. Pressure vessel
HIC1/2 Heat inner exchanger
P. HEX Plate Heat Exchanger
PRV1/2 Pressure relief valve
AAV Air separator (Auto air vent)
OCH816
PUZ-WZ80VAA-BS.UK
Check/V(H)
P. Sensor
PRV2
Check/V(L)
PRV1
TH34 LEV-B
Strainer1
Strainer2
Check/V(L)
Part name
DC inverter twin rotary compressor (Mitsubishi Electric Corporation)
Fixed speed single compressor (Mitsubishi Electric Corporation)
For protection (OFF: 3.20MPa)
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
Inverter power board
Heating: Secondary LEV
Heating: Primary LEV
Heating only
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 defrost control
For compressor protection
Heating: Sub cool liquid temperature Cooling: Evaporating temperature
For compressor protection
For compressor protection
For accumulation of refrigerant
For compressor protection
MWA3-44DM (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
H/P. SW1
REV/V
Muffler1
TH4
TH33
TH8 P/B
T-Protector
INV. COMP
HIC1
LEV-A
P.V.
Strainer4
Strainer3
Check/V(H) H/P. SW2
TH35
Muffler2
FIX. COMP
HIC2
LEV-C
Strainer6
Strainer5
Cooling: Primary LEV
Cooling: Secondary LEV
30
TH6 TH7
TH3
TH32
HEX
Refrigerant flow in cooling
Refrigerant flow in heating
Detail
Cooling: Sub cool liquid temperature
Cooling: Condensing temperature