Refrigerant Circuit (Piping Diagrams); Outdoor Unit; Refrigerant Circuit Part - Daikin VRV EMERION RXYQ-AATJA Service Manual

SiUS342303E

1. Refrigerant Circuit (Piping Diagrams)

1.1

Outdoor Unit

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

Refrigerant Circuit (Piping Diagrams)

Function
38