Refrigerant Circuit Part; Refrigerant Circuit (Piping Diagrams); Outdoor Unit - Daikin VRV Aurora RXLQ-TATJU Series Service Manual

Refrigerant Circuit (Piping Diagrams)

1. Refrigerant Circuit (Piping Diagrams)
1.1

Outdoor Unit

No. in
Electric
piping
symbol
diagram
(1) M1C Compressor
M1F Fan motor
(2)
M2F
Electronic expansion valve
(3) Y1E
(Heat exchanger upper)
Electronic expansion valve
(4) Y2E
(Subcooling heat exchanger)
Electronic expansion valve
(5) Y3E
(Heat exchanger lower)
Electronic expansion valve
(6) Y4E
(Subcooling injection)
Electronic expansion valve
(7) Y5E
(Refrigerant cooling)
Electronic expansion valve
(8) Y6E
(Leak detection)
Electronic expansion valve
(9) Y7E
(Receiver gas purge)
Solenoid valve
(10) Y1S
(Oil separator oil return)
(11) Y2S Solenoid valve (Hot gas bypass) Used to flow discharge gas to the compressor inlet.
(12) Y3S Solenoid valve (Liquid shutoff)
Four way valve
(13) Y4S
(HP/LP gas pipe)
Four way valve
(14) Y5S
(Heat exchanger lower)
Four way valve
(15) Y6S
(Heat exchanger upper)
Solenoid valve
(16) Y7S
(Accumulator oil return)
(17) S1NPH High pressure sensor
(18) S1NPL Low pressure sensor
High pressure switch
(19) S1PH
(For compressor)
Pressure regulating valve
(20) —
(Liquid pipe)
(21) — Subcooling heat exchanger
Capillary tube
(22) —
Thermistor (Outdoor air)
(23) R1T
(24) R21T Thermistor (M1C discharge)
Thermistor
(25) R3T
(Receiver inlet)
Thermistor
(26) R4T
(Heat exchanger liquid upper)
Thermistor
(27) R5T
(Heat exchanger liquid lower)
(28) R6T Thermistor (Subcooling gas)
(29) R7T Thermistor (Subcooling liquid)
Thermistor
(30) R8T
(Heat exchanger gas upper)
Thermistor
(31) R9T
(Heat exchanger gas lower)
(32) R10T Thermistor (Suction)
37
Name
Compressor is operated in multi-steps according to Te and Tc.
Because the system is an air heat exchange type, the fan rotation speed is
varied by using inverter.
While in heating, 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.
While in heating, PI control is applied to keep the outlet superheating degree
of air heat exchanger constant.
Used to control compressor injection.
Used to control the refrigerant amount to cool the diode bridge and power
module of the inverter PCB.
Used to detect refrigerant leakage.
Used to collect the refrigerant to receiver.
Used to return oil from the oil separator to the compressor.
Used to shut off liquid refrigerant flow to the receiver.
Used to switch dual pressure gas pipe to high pressure or low pressure.
Used to switch outdoor unit heat exchanger to evaporator or condenser.
Used to return oil from the accumulator to the compressor.
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 others.
Used to detect discharge pipe temperature.
Used to detect liquid pipe temperature of receiver inlet.
This detects temperature of liquid pipe for air heat exchanger.
This detects temperature of gas pipe for subcooling heat exchanger.
This detects temperature of liquid pipe for subcooling heat exchanger.
This detects temperature of gas pipe for air heat exchanger.
Used to detect suction pipe temperature.
SiUS341802EC
Function
Part 2 Refrigerant Circuit