Refrigerant Circuit (Piping Diagrams) SiAF332111E
16 Part 2 Refrigerant Circuit
1. Refrigerant Circuit (Piping Diagrams)
1.1 Outdoor Unit
1.1.1 RXQ4ARV1
No. in
piping
diagram
Electric
Symbol
Name Function
(1) M1C Compressor motor Compressor is operated in multi-steps according to Te.
(2) M1F Fan motor The fan rotation speed is varied by using inverter.
(3) Y2S
Solenoid valve
(Hot gas bypass pipe)
Used to prevent the low pressure from transient falling.
(4) Y3S
Solenoid valve
(Unload circuit)
Used for unloading operation of compressor.
(5) S1NPH High pressure sensor Used to detect high pressure.
(6) S1NPL Low pressure sensor Used to detect low pressure.
(7) 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.
(8) —
Pressure regulating valve
(Receiver to discharge pipe)
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.
(9) R1T
Thermistor
(Outdoor air: Ta)
Used to detect outdoor air temperature, correct discharge pipe temperature,
and for other purposes.
(10) R2T
Thermistor
(Discharge pipe: Tdi)
Used to detect discharge pipe temperature, make the temperature protection
control of compressor, and for other purposes.
(11) R3T
Thermistor
(Suction pipe 1: Ts1)
Used to detect suction pipe temperature, and for other purposes.
(12) R4T
Thermistor
(Heat exchanger deicer: Tb)
Used to detect liquid pipe temperature of air heat exchanger, and for other
purposes.
(13) R5T
Thermistor
(Suction pipe 2: Ts2)
Used for calculation of internal temperature of compressor, and for other
purposes.
(14) R10T
Thermistor (Radiation fin) • Used for outdoor fan speed control.
• Used for radiation fin temperature control.
• Used for pressure difference control.
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