SiAF332111E Refrigerant Circuit (Piping Diagrams)
Part 2 Refrigerant Circuit 23
1.1.4 RXMQ10/12ARY1
No. in
piping
diagram
Electric
symbol
Name Function
(1) M1C
Compressor motor Compressor is operated on frequencies between 60 Hz and 387.3 Hz by
using the inverter.
(2)
M1F
M2F
Fan motor Since the system is of air heat exchanging type, the fan is operated at 8-step
rotation speed by using the inverter.
(3) Y1E
Electronic expansion valve
(Main)
Fully open during cooling operation.
(4) Y2E
Electronic expansion valve
(Injection)
Used to cool the compressor by injecting refrigerant when the compressor
discharge pipe temperature is high.
(5) Y2S
Solenoid valve
(Accumulator oil return)
Used to return oil from the accumulator to the compressor.
(6) S1NPH High pressure sensor Used to detect high pressure.
(7) S1NPL Low pressure sensor Used to detect low pressure.
(8) 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 or more to stop the
compressor operation.
(9) —
Pressure regulating valve
(Receiver to discharge pipe)
This valve opens at a pressure of 4.0 MPa to prevent pressure increase, thus
protecting functional parts from damage due to the increase of pressure in
transportation or storage.
(10) —
Capillary tube Used to return the refrigerating oil separated through the oil separator to the
compressor.
(11) R1T
Thermistor (Outdoor air) Used to detect outdoor air temperature, correct discharge pipe temperature,
and for other purposes.
(12) R21T
Thermistor (Discharge pipe) Used to detect discharge pipe temperature, for temperature protection control
of the compressor, and for other purposes.
(13) R3T Thermistor (Accumulator) Used to detect gas pipe temperature at the accumulator inlet.
(14) R4T
Thermistor
(Heat exchanger liquid pipe)
Used to detect liquid pipe temperature.
(15) R5T
Thermistor
(Subcooling heat exchanger
liquid pipe)
Used to detect liquid pipe temperature of the subcooling heat exchanger.
(16) R6T
Thermistor
(Subcooling heat exchanger
gas pipe)
Used to detect the gas pipe temperature on evaporation side of the heat
exchanger, keep the superheating degree at the heat exchanger constant,
and for other purposes.
(17) R7T
Thermistor
(Heat exchanger deicer)
Used to detect liquid pipe temperature of air heat exchanger and for other
purposes.
(18) R8T
Thermistor (Compressor
body)
Detects compressor surface temperature to stop operation at the surface
temperature of 120°C or more.
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