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Refrigerant Circuit (Piping Diagrams)
1. Refrigerant Circuit (Piping Diagrams)
1.1
Outdoor Unit
1.1.1 RXQ4ARV1
No. in
Electric
piping
Symbol
diagram
(1)
M1C
Compressor motor
(2)
M1F
Fan motor
Solenoid valve
(3)
Y2S
(Hot gas bypass pipe)
Solenoid valve
(4)
Y3S
(Unload circuit)
(5)
S1NPH
High pressure sensor
(6)
S1NPL
Low pressure sensor
High pressure switch
(7)
S1PH
Pressure regulating valve
(8)
—
(Receiver to discharge pipe)
Thermistor
(9)
R1T
(Outdoor air: Ta)
Thermistor
(10)
R2T
(Discharge pipe: Tdi)
Thermistor
(11)
R3T
(Suction pipe 1: Ts1)
Thermistor
(12)
R4T
(Heat exchanger deicer: Tb)
Thermistor
(13)
R5T
(Suction pipe 2: Ts2)
Thermistor (Radiation fin)
(14)
R10T
16
Name
Compressor is operated in multi-steps according to Te.
The fan rotation speed is varied by using inverter.
Used to prevent the low pressure from transient falling.
Used for unloading operation of 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 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.
Used to detect liquid pipe temperature of air heat exchanger, and for other
purposes.
Used for calculation of internal temperature of compressor, and for other
purposes.
• Used for outdoor fan speed control.
• Used for radiation fin temperature control.
• Used for pressure difference control.
Function
Part 2 Refrigerant Circuit
SiAF332111E
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