Daikin RXYQ-TA Series, Руководство по обслуживанию, Страница: 24 / 337

Refrigerant Circuit SiUS341615E
11 Refrigerant Circuit
1.1.2 RXYQ96/120TAYDU, RXYQ96/120TATJU
No. in
piping
diagram
Electric
symbol
Name Function
(1) M1C Inverter compressor Inverter compressor is operated in multi-steps according to Te.
(2) M1F
Inverter fan
Because the system is an air heat exchange type, the fan is operated at 10-step rotation
speed by using the inverter.
(3) M2F
(4) Y1E
Electronic expansion valve
(Main)
Fully open during cooling operation.
(5) Y2E
Electronic expansion valve
(Injection) PI control is applied to keep the outlet superheated degree of subcooling heat exchanger
constant.
(6) Y1S
Solenoid valve
(Four way valve)
Used to switch the operation mode between cooling and heating.
(7) Y2S
Solenoid valve
(Accumulator oil return)
Used to return oil from the accumulator to the compressor.
(8) Y3S Solenoid valve (Oil return) Used to control the amount of oil from the oil separator to the compressor.
(9) S1NPH High pressure sensor Used to detect high pressure.
(10) S1NPL Low pressure sensor Used to detect low pressure.
(11) S1PH High pressure switch
In order to prevent the increase of high pressure when an error occurs, this switch is
activated at high pressure of 4.0 MPa (580 psi) or more to stop the compressor operation.
(12) — Pressure regulating valve
This valve opens at a pressure of 4.0 MPa (580 psi) for prevention of pressure increase,
thus resulting in no damage of functional parts due to the increase of pressure in
transportation or storage.
(13) — Subcooling heat exchanger Used to subcooling liquid refrigerant from the electronic expansion valve.
(14) — Capillary tube Used to return the refrigerating oil separated through the oil separator to the compressor.
(15) R1T Thermistor (Outdoor air) Used to detect outdoor air temperature, correct discharge pipe temperature, and others.
(16) R21T Thermistor (Discharge pipe)
Used to detect discharge pipe temperature, make the temperature protection control of
compressor, and others.
(17) R3T Thermistor (Accumulator inlet) Used to detect gas pipe temperature at the accumulator inlet.
(18) R4T
Thermistor (Heat exchanger
liquid pipe)
This detects temperature of liquid pipe between the air heat exchanger and main
electronic expansion valve. Used to make judgements on the recover or discharge
refrigerants to the refrigerant regulator.
(19) R5T
Thermistor (Subcooling heat
exchanger liquid pipe) This detects temperature of liquid pipe between the main electronic expansion valve and
subcooling heat exchanger.
(20) R6T
Thermistor (Subcooling heat
exchanger gas pipe)
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.
(21) R7T
Thermistor
(Heat exchanger deicer)
Used to detect liquid pipe temperature of air heat exchanger.
(22) R8T
Thermistor
(Compressor body) Detects compressor surface temperature, this switch is activated at surface temperature
of 120°C (248°F) or more to stop the compressor operation.