Basic Control
SiUS39-601
38
Function
2.3
Electronic Expansion Valve PI Control
Main Motorized Valve EV1 Control
Carries out the motorized valve (Y1E) PI control to maintain the evaporator outlet superheated
degree (SH) at constant during heating operation to make maximum use of the outdoor unit heat
exchanger (evaporator).
The optimum initial value of the evaporator outlet superheated degree is 9°F, but varies depending
on the discharge pipe superheated degree of inverter compressor.
Subcooling Motorized Valve EV2 Control
Makes PI control of the motorized valve (Y2E) to keep the superheated degree of the outlet gas
pipe on the evaporator side for the full use of the subcooling heat exchanger.
SH = Ts - Te
SH : Evaporator outlet superheated degree (°F)
Ts : Suction pipe temperature detected by thermistor
R2T (°F)
Te : Low pressure equivalent saturation temperature
(°F)
SH = Tsh
-Te
SH : Outlet superheated degree of evaporator (
°
F)
Tsh : Suction pipe temperature detected with the
thermistor R5T (
°
F)
Te : Low pressure equivalent saturation temperature
(
°
F)
Содержание RXYQ72
Страница 16: ...SiUS39 601 Specifications 5 Part 2 Specifications 1 Specifications 6 1 1 Outdoor Units 6 1 2 Indoor Units 11...
Страница 115: ...Field Setting SiUS39 601 104 Test Operation...
Страница 227: ...Troubleshooting OP Unified ON OFF Controller SiUS39 601 216 Troubleshooting...
Страница 231: ...Piping Diagrams SiUS39 601 220 Appendix 1 Piping Diagrams 1 1 Outdoor Unit RXYQ72M 96M...
Страница 235: ...Wiring Diagrams for Reference SiUS39 601 224 Appendix 2 2 Field Wiring RXYQ72 96MTJU C 3D042647B...
Страница 236: ...SiUS39 601 Wiring Diagrams for Reference Appendix 225 RXYQ144 168 192MTJU C 3D050353A...
Страница 239: ...Wiring Diagrams for Reference SiUS39 601 228 Appendix FXAQ07M 09M 12M 18M 24MVJU FXHQ12M 24M 36M 3D046039C 3D048116...
Страница 240: ...SiUS39 601 Wiring Diagrams for Reference Appendix 229 FXLQ12M 18M 24MVJU FXNQ12M 18M 24MVJU 3D045644A...
Страница 249: ...Example of Connection SiUS39 601 238 Appendix...
Страница 255: ...Method of Replacing The Inverter s Power Transistors and Diode Modules SiUS39 601 244 Appendix...
Страница 265: ...Precautions for New Refrigerant R 410A SiUS39 601 254 Precautions for New Refrigerant R 410A...
Страница 269: ...SiUS39 601 iv Index...