Refrigerant Circuit Part; Refrigerant Circuit (Piping Diagrams); Outdoor Unit - Daikin RXQ12AHR Service Manual

Refrigerant Circuit (Piping Diagrams)

1. Refrigerant Circuit (Piping Diagrams)
1.1

Outdoor Unit

1.1.1 RXQ6/8/10/12/14A
No. in
Electric
piping
symbol
diagram
(1) M1C Inverter compressor
(2) M1F Inverter fan
Inverter fan
(3) M2F
(RXQ14A only)
Electronic expansion
(4) Y2E
valve (Injection)
Electronic expansion
(5) Y4E valve (Refrigerant auto
charge)
Solenoid valve
(6) Y3S
(Oil return 1)
(7) S1NPH High pressure sensor
(8) S1NPL Low pressure sensor
High pressure switch
(9) S1PH (For M1C compressor)
Pressure regulating valve
(10) —
Double tube heat
(11) — exchanger (Subcooling
heat exchanger)
Capillary tube
(12) —
Thermistor
(13) R1T
(Outdoor air: Ta)
Thermistor
(14) R21T
(Discharge pipe: Tdi1)
Thermistor
(15) R3T
(Suction pipe: Ts)
Thermistor (Heat
(16) R4T exchanger liquid pipe: Tf)
Thermistor (Subcooling
(17) R5T heat exchanger liquid
pipe: Tsc)
Thermistor (Subcooling
(18) R6T heat exchanger gas pipe:
Tsh)
Thermistor
(19) R8T
(Compressor body: Ti1)
42
Name
Inverter compressor is operated in multi-steps according to Te.
The fan rotation speed is varied by using inverter.
PI control is applied to keep the outlet superheated 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 amount of oil from the oil separator to the compressor.
Used to detect high pressure.
Used to detect low pressure.
In order to prevent the increase of high pressure when an error occurs, this switch
is activated at high pressure of 4.0 MPa or more to stop the compressor
operation.
This valve opens at a pressure of 4.0 MPa for prevention of pressure increase,
thus resulting in no damage of functional parts due to the increase of pressure in
transportation or storage.
Used to subcool 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, make the temperature protection
control of compressor, and others.
Used to detect suction pipe temperature, and for other purposes.
This detects temperature of liquid pipe between the air heat exchanger and check
valve. Used to make judgments on the recover or discharge refrigerants to the
refrigerant regulator.
This detects temperature of liquid pipe between the double tube heat exchanger.
This detects temperature of gas pipe on the evaporation side of subcooling heat
exchanger. Used to exercise the constant control of superheated degree at the
outlet of subcooling heat exchanger.
Detects compressor surface temperature, this switch is activated at surface
temperature of 120°C or more to stop the compressor operation.
Function
Part 2 Refrigerant Circuit
SiAF341904E