SiUS281811EA Refrigerant Circuit (Piping Diagrams)
Part 2 Refrigerant Circuit 69
1. Refrigerant Circuit (Piping Diagrams)
1.1 RZR18/24TAVJU, RZQ18/24TAVJU
No. in
piping
diagram
Electric
symbol
Name Function
(1) M1C Inverter compressor Compressor is operated in multi-steps according to Te and Tc.
(2) M1F Inverter fan The fan rotation speed is varied by using inverter.
(3) Y1E
Electronic expansion
valve (Main)
While in heating operation, PI control is applied to keep the outlet superheated
degree of air heat exchanger constant.
(4) Y1S Four way valve Used to switch the operation mode between cooling and heating.
(5) Y2S Solenoid valve (Hot gas) Used to prevent the low pressure from transient falling.
(6) Y3S
Solenoid valve
(Unload circuit)
Used for unloading operation of compressor.
(7) S1NPH High pressure sensor Used to detect high pressure.
(8) S1NPL Low pressure sensor Used to detect low pressure.
(9) S1PH
High pressure switch (For
compressor)
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.
(10) —
Fusible plug In order to prevent the increase of pressure when abnormal heating is caused by
fire or others, the fusible part of the plug is molten at a temperature of 70 to 75°C
(158 to 167°F) to release the pressure into the atmosphere.
(11) —
Pressure regulating valve
(Receiver to discharge
pipe)
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.
(12) R1T
Thermistor
(Outdoor air: Ta)
Used to detect outdoor air temperature, correct discharge pipe temperature, and
for other purposes.
(13) R2T
Thermistor
(Discharge pipe: Tdi)
Used to detect discharge pipe temperature, make the temperature protection
control of compressor, and for other purposes.
(14) R3T
Thermistor
(Suction pipe 1: Ts1)
Used to detect suction pipe temperature, keep the suction superheated degree
constant in heating operation, and for other purposes.
(15) R4T
Thermistor (Heat
exchanger deicer: Tb)
Used to detect liquid pipe temperature of air heat exchanger, determine
defrosting operation, and for other purposes.
(16) R5T
Thermistor
(Suction pipe 2: Ts2)
Used to the calculation of an internal temperature of compressor etc.
(17) R7T
Thermistor
(Liquid pipe: Tl)
Used to detect refrigerant overcharge in check operation, and for other purposes.
(18) R10T
Thermistor (Radiation fin) Used for outdoor fan speed control, inverter radiation fin temperature control,
pressure difference control.
To Next Page
Loading...
