Refrigerant Circuit
Si39-504
44
Refirgerant Circuit
1.
Refrigerant Circuit
1.1
RXYQ5MA
No. in
refrigerant
system
diagram
Symbol
Name
Major Function
A
M1C
Inverter compressor (INV)
Inverter compressor is operated on frequencies between 52 Hz and 210 Hz by using
the inverter. The number of operating steps is as follows when Inverter compressor is
operated.
RXYQ5MA : 20 steps
D
M1F
Inverter fan
Since the system is of air heat exchanging type, the fan is operated at 9-step rotation
speed by using the inverter.
E
Y1E
Electronic expansion valve
(Main: EV1)
While in heating operation, PI control is applied to keep the outlet superheated degree
of air heat exchanger constant.
G
Y1S
Solenoid valve (Hot gas: SVP) Used to prevent the low pressure from transient falling.
J
Y2S
Solenoid valve (Receiver gas
discharging: SVG)
Used to collect refrigerant to receiver.
K
Y4S
Solenoid valve (Injection)
Used to cool the compressor by injecting refrigerant when the compressor discharge
temperature is high.
M
Y3S
4-way valve
Used to switch the operation mode between cooling and heating.
N
S1NPH High pressure sensor
Used to detect high pressure.
O
S1NPL Low pressure sensor
Used to detect low pressure.
P
S1PH
HP pressure switch (For INV
compressor)
In order to prevent the increase of high pressure when a malfunction occurs, this
switch is activated at high pressure of 4.0 MPa or more to stop the compressor
operation.
S
—
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 to
release the pressure into the atmosphere.
T
—
Pressure regulating valve 1
(Receiver to discharge pipe)
This valve opens at a pressure of 2 to 2.7 MPa for prevention of pressure increase,
thus resulting in no damage of functional parts due to the increase of pressure in
transportation or storage.
V
—
Piping heat exchanger
Used to heat the gas refrigerant from the liquid receiver.
W
—
Capillary tube
Used to return the refrigerating oil separated through the oil separator to the
compressor.
1
R1T
Thermistor (Outdoor air: Ta)
Used to detect outdoor temperature, correct discharge pipe temperature, and others.
2
R2T
Thermistor (Suction pipe: Ts)
Used to detect suction pipe temperature, keep the suction superheated degree
constant in heating operation, and others.
3
R3T
Thermistor (INV discharge
pipe: Tdi)
Used to detect discharge pipe temperature, make the temperature protection control of
compressor, and others.
4
R4T
Thermistor (Heat exchanger
deicer: Tb)
Used to detect liquid pipe temperature of air heat exchanger, determine defrosting
operation, and others.
5
R5T
Thermistor (Sub-cooling heat-
exchanger outlet)
Used to judge the refrigerant overcharge at the check operation.
Summary of Contents for VRV II RXYQ5MATL
Page 53: ...Specifications Si39 504 42 Specifications...
Page 115: ...Outline of Control Indoor Unit Si39 504 104 Function...
Page 161: ...Field Setting Si39 504 150 Test Operation...
Page 172: ...Si39 504 Troubleshooting by Remote Controller Troubleshooting 161...
Page 266: ...Si39 504 Piping Diagrams Appendix 255 RXYQ8MA 10MA 12MAYL E TL E 3D048033A...
Page 267: ...Piping Diagrams Si39 504 256 Appendix RXYQ14MA 16MAYL E TL E 3D048034A...
Page 271: ...Wiring Diagrams for Reference Si39 504 260 Appendix RXYQ8MA 10MA 12MAYL E 3D047088C...
Page 272: ...Si39 504 Wiring Diagrams for Reference Appendix 261 RXYQ14MA 16MAYL E 3D047089C...
Page 273: ...Wiring Diagrams for Reference Si39 504 262 Appendix 2 1 2 RXYQ MATL E RXYQ5MATL E 3D049059A...
Page 274: ...Si39 504 Wiring Diagrams for Reference Appendix 263 RXYQ8MA 10MA 12MATL E 3D049060A...
Page 275: ...Wiring Diagrams for Reference Si39 504 264 Appendix RXYQ14MA 16MATL E 3D049061A...
Page 283: ...Wiring Diagrams for Reference Si39 504 272 Appendix FXCQ40M 50M 80M 125MVE 3D039557A...
Page 285: ...Wiring Diagrams for Reference Si39 504 274 Appendix FXKQ25M 32M 40M 63MVE 3D039564B...
Page 289: ...Wiring Diagrams for Reference Si39 504 278 Appendix FXMQ40M 50M 63M 80M 100M 125MVE 3D039620B...
Page 290: ...Si39 504 Wiring Diagrams for Reference Appendix 279 FXMQ200M 250MVE 3D039621B...
Page 291: ...Wiring Diagrams for Reference Si39 504 280 Appendix FXHQ32M 63M 100MVE 3D039801D...
Page 292: ...Si39 504 Wiring Diagrams for Reference Appendix 281 FXAQ20M 25M 32MVE 40M 50M 63MVE 3D034206C...
Page 309: ...Selection of Pipe Size Joints and Header Si39 504 298 Appendix Note 1...
Page 315: ...Method of Replacing The Inverter s Power Transistors and Diode Modules Si39 504 304 Appendix...
