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SiUS342303E Refrigerant Circuit (Piping Diagrams)
Part 2 Refrigerant Circuit 38
1. Refrigerant Circuit (Piping Diagrams)
1.1 Outdoor Unit
No. in
piping
diagram
Electric
symbol
Name Function
(1) M1C Compressor 1 Compressor is operated in multi-steps according to Te or Tc by
using inverter.
(2) M2C Compressor 2 (Only for 96-240 class)
(3) M1F Fan motor 1 The fan rotation speed is varied by using inverter.
(4) M2F Fan motor 2 (Only for 96-240 class)
(5) Y1E
Electronic expansion valve
(Heat exchanger main)
(Right side for 192-240 class)
While being used as evaporator, PI control is applied to keep the
outlet superheating degree of air heat exchanger constant.
(6) Y2E
Electronic expansion valve
(Refrigerant cooling IPM)
Used to control the refrigerant flow to cool the diode bridge and
power module of the inverter PCB.
(7) Y3E
Electronic expansion valve
(Subcooling heat exchanger)
PI control is applied to keep the outlet superheating degree of
subcooling heat exchanger constant.
(8) Y4E
Electronic expansion valve
(Refrigerant auto charge)
Used to control refrigerant charging speed during refrigerant auto
charge operation and to stop refrigerant charge automatically.
(9) Y5E
Electronic expansion valve
(Refrigerant cooling air)
Used to control the refrigerant flow to cool the air inside the
electrical component box.
(10) Y6E
Electronic expansion valve
(Heat exchanger left)
(Only for 192-240 class)
While being used as evaporator, PI control is applied to keep the
outlet superheating degree of air heat exchanger constant.
(11) Y1S
Solenoid valve
(Oil separator oil return 1 for 72 class,
Oil separator oil return 2 for 96-240 class)
Used to return oil from the oil separator to the compressor.
(12) Y2S
Solenoid valve
(Oil separator oil return 1 for 96-240 class)
(13) Y3S
Solenoid valve (Hot gas bypass) Used to bypass high pressure gas at the bottom of the outdoor
heat exchanger.
(14) Y4S Solenoid valve (Accumulator oil return) Used to return oil from the accumulator to the compressor.
(15) Y5S
Solenoid valve (Four way valve) Used to switch outdoor heat exchanger to evaporator or
condenser.
(16) Y6S Solenoid valve (Injection) Used to control compressor injection.
(17) S1NPH High pressure sensor Used to detect the high pressure.
(18) S1NPL Low pressure sensor Used to detect the low pressure.
(19) S1PH High pressure switch (M1C) This functions when pressure increases to stop operation and
avoid high pressure increase in the fault operation.
(20) S2PH High pressure switch (M2C)
(21) —
Pressure regulating valve (Liquid pipe) This is used when pressure increases, to prevent any damage on
components caused by pressure increase in transport or storage.
(22) — Subcooling heat exchanger Apply subcooling to liquid refrigerant.
(23) — Capillary tube Used to return the refrigerating oil separated through the oil
separator to the compressor.
(24) — Capillary tube
(25) R1T
Thermistor (Outdoor air) Used to detect outdoor air temperature, correct discharge pipe
temperature and for other purposes.
(26) R2T
Thermistor (Heat exchanger liquid pipe)
(Right side for 192-240 class)
This detects temperature of liquid pipe for air heat exchanger.
(27) R3T
Thermistor (Heat exchanger deicer)
(Right side for 192-240 class)
Used to detect liquid pipe temperature of air heat exchanger. Used
to make judgements on defrost operation.
(28) R4T Thermistor (Electrical box air outlet) Used to detect the outlet pipe temperature of refrigerant cooling air.
(29) R5T
Thermistor
(Suction pipe before accumulator)
Used to detect temperature of the suction pipe before accumulator.
(30) R6T Thermistor (Subcooling gas pipe) This detects temperature of gas pipe for subcooling heat
exchanger.
(31) R7T
Thermistor (Subcooling injection)
(Only for 192-240 class)
(32) R8T
Thermistor (Subcooling liquid pipe) This detects temperature of liquid pipe for subcooling heat
exchanger.
(33) R9T
Thermistor (Heat exchanger left liquid
pipe) (Only for 192-240 class)
This detects temperature of liquid pipe for air heat exchanger.