Refrigerant Circuit Part; Refrigerant Circuit (Piping Diagrams); Outdoor Unit - Daikin VRV RXYMQ-A Series Service Manual

SiME332106E

1. Refrigerant Circuit (Piping Diagrams)

1.1

Outdoor Unit

No. in
Electric
piping
symbol
diagram
(1) M1C Compressor motor
(2) M1F Fan motor
Electronic expansion
(3) Y1E
valve (Main)
Electronic expansion
(4) Y2E
valve (Injection)
Electronic expansion
(5) Y3E
valve (Refrigerant jacket)
Electronic expansion
(6) Y4E valve (Refrigerant auto
charge)
Solenoid valve (Four way
(7) Y1S
valve
(8) S1NPH High pressure sensor
(9) S1NPL Low pressure sensor
High pressure switch
(10) S1PH
Pressure regulating valve
(11) —
Double tube heat
(12) — exchanger (Subcooling
heat exchanger)
Thermistor
(13) R1T
(Outdoor air: Ta)
Thermistor
(14) R21T
(Discharge pipe: Tdi1)
Thermistor
(15) R3T
(Suction pipe: Ts)
Thermistor
(16) R4T (Heat exchanger liquid
pipe: Tf)
Thermistor
(Subcooling heat
(17) R5T
exchanger liquid pipe:
Tsc)
Thermistor
(18) R6T (Subcooling heat
exchanger gas pipe: Tsh)
Thermistor
(19) R7T (Heat exchanger deicer:
Tb)
Part 2 Refrigerant Circuit
Name
Compressor is operated in multi-steps according to Te.
The fan rotation speed is varied by using the inverter.
Fully open during cooling operation.
PI control is applied to keep the outlet superheating degree of subcooling heat
exchanger constant.
Used in heating operation to control inverter fin temperature by adjusting the
refrigerant flow.
Used to control refrigerant charging speed during refrigerant auto charge
operation and to stop refrigerant charge automatically.
Used to switch the operation mode between cooling and heating.
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 from the electronic expansion valve.
Used to detect outdoor air temperature, correct discharge pipe temperature, and
for other purposes.
Used to detect discharge pipe temperature, make the temperature protection
control of compressor, and for other purposes.
Used to detect suction pipe temperature, and for other purposes.
This detects temperature of liquid pipe between the air heat exchanger and main
electronic expansion valve. Used to make judgments on the recover or discharge
refrigerants to the refrigerant regulator.
This detects temperature of liquid pipe after subcooling heat exchanger.
This detects temperature of gas pipe on the evaporation side of subcooling heat
exchanger. Used to exercise the constant control of superheating degree at the
outlet of subcooling heat exchanger.
Used to detect liquid pipe temperature of air heat exchanger.
Refrigerant Circuit (Piping Diagrams)
Function
15