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

SiUS372201EB

1. Refrigerant Circuit (Piping Diagrams)

1.1

Outdoor Unit

1.1.1 REYQ72AA
No. in
Electric
piping
symbol
diagram
(1) M1C Compressor
(2) M1F Fan motor
Electronic expansion valve
(3) Y1E
(Heat exchanger right upper)
Electronic expansion valve
(4) Y2E
(Heat exchanger right lower)
Electronic expansion valve
(5) Y3E
(Subcooling heat exchanger)
Electronic expansion valve
(6) Y4E
(Receiver gas purge)
Electronic expansion valve
(7) Y6E
(Refrigerant cooling IPM)
Electronic expansion valve
(8) Y7E
(Refrigerant cooling air)
(9) Y8E Electronic expansion valve
Solenoid valve
(10) Y1S
(Oil separator oil return)
(11) Y3S Solenoid valve (Liquid shutoff)
Solenoid valve
(12) Y4S
(Accumulator oil return)
Solenoid valve
(13) Y5S
(Refrigerant adjustment)
Four way valve
(14) Y7S
(Heat exchanger right lower)
Four way valve
(15) Y8S
(HP/LP gas pipe)
Four way valve
(16) Y10S
(Heat exchanger right upper)
Solenoid valve
(17) Y11S
(Refrigerant cooling bypass)
(18) S1NPH High pressure sensor
(19) S1NPL Low pressure sensor
High pressure switch
(20) S1PH
Pressure regulating valve
(21) —
(Liquid pipe)
(22) — Subcooling heat exchanger
Capillary tube
(23) —
Thermistor (Outdoor air)
(24) R1T
Thermistor
(25) R2T (Heat exchanger right upper gas
pipe)
Thermistor
(26) R3T
(Electrical box air outlet)
Thermistor
(27) R4T
(Receiver gas purge)
Thermistor
(28) R5T (Suction pipe before
accumulator)
Part 2 Refrigerant Circuit
Name
Compressor is operated in multi-steps according to Te and Tc.
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.
PI control is applied to keep the outlet superheating degree of subcooling
heat exchanger constant.
Used to collect the refrigerant to receiver.
Used to control the refrigerant flow to cool the diode bridge and power
module of the inverter PCB.
Used to control the refrigerant flow to cool the air inside the electrical
component box.
Not used
Used to return oil from the oil separator to the compressor.
Used to shut off liquid refrigerant flow to the receiver.
Used to return oil from the accumulator to the compressor.
Not used
Used to switch outdoor heat exchanger to evaporator or condenser.
Used to switch dual pressure gas pipe to high pressure or low pressure.
Used to switch outdoor heat exchanger to evaporator or condenser.
Used when Y6E alone does not provide enough cooling.
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 gas pipe for air heat exchanger.
Used to detect the outlet pipe temperature of refrigerant cooling air.
Used to detect gas pipe temperature of receiver gas purge piping.
Used to detect temperature of the suction pipe before accumulator.
Refrigerant Circuit (Piping Diagrams)
Function
58