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SiUS34-801A_b
Refrigerant Flow for Each Operation Mode
VRVIII R-410A Heat Recovery 60Hz
183
Pressure equalizing when switching operation cooling/ heating
1. When switching operation from to cooling to heating
First, the electric expansion valves for EVHS, EVH, EVL and EVLS of the indoor unit will be
closed.
Next, open the EVHS, and it makes to balance the system pressure.
Finally, EVH and EVHS are opened and the electric expansion valve of the indoor unit is
opened to start the operation as a heating circuit.
In cooling
operation
In equalization
To heating
operation
BS Unit
Indoor Unit
Cooling
Unit
EVH
EVL
EVHS
EVLS
EVSC
Suction
Pipe
Dual
Pressure
Gas Pipe
Liquid
Pipe
BS Unit
Indoor Unit
(Close)
EVH (Close)
EVL (Close)
EVHS (Open)
EVLS (Close)
EVSC
Suction
Pipe
Dual
Pressure
Gas Pipe
Liquid
Pipe
BS Unit
Indoor Unit
Heating
Unit
EVH
EVL
EVHS
EVLS
EVSC
Suction
Pipe
Dual
Pressure
Gas Pipe
Liquid
Pipe
Summary of Contents for VRV III
Page 15: ...SiUS34 801A_b xiv ...
Page 23: ...Model Selection SiUS34 801A_b 8 General Information ...
Page 133: ...Field Settings SiUS34 801A_b 118 VRVIII R 410A Heat Pump 60Hz ...
Page 254: ...SiUS34 801A_b Test Operation VRVIII R 410A Heat Recovery 60Hz 239 R 410A Label R 410A Label ...
Page 329: ...Field Setting SiUS34 801A_b 314 Indoor Unit ...
Page 340: ...SiUS34 801A_b Troubleshooting by Remote Controller Troubleshooting 325 ...
Page 490: ...SiUS34 801A_b Piping Diagrams Appendix 475 Heat Pump 230V RXYQ72 96 120PTJU 3D058636A ...
Page 491: ...Piping Diagrams SiUS34 801A_b 476 Appendix Heat Pump 230V RXYQ144PTJU 3D058640 ...
Page 492: ...SiUS34 801A_b Piping Diagrams Appendix 477 Heat Recovery 460V REYQ72 96 120PYDN 3D058639A ...
Page 493: ...Piping Diagrams SiUS34 801A_b 478 Appendix Heat Recovery 460V REMQ72PYDN 3D058637A ...
Page 494: ...SiUS34 801A_b Piping Diagrams Appendix 479 Heat Recovery 460V REMQ96 120PYDN 3D058638A ...
Page 495: ...Piping Diagrams SiUS34 801A_b 480 Appendix Heat Recovery 230V REYQ72 96 120PTJU 3D058639A ...
Page 496: ...SiUS34 801A_b Piping Diagrams Appendix 481 Heat Recovery 230V REYQ144PTJU 3D058640 ...
Page 497: ...Piping Diagrams SiUS34 801A_b 482 Appendix Heat Recovery 230V REMQ72PTJU 3D058637A ...
Page 498: ...SiUS34 801A_b Piping Diagrams Appendix 483 Heat Recovery 230V REMQ96 120PTJU 3D058638A ...
Page 501: ...Piping Diagrams SiUS34 801A_b 486 Appendix 1 3 BS Unit 4D057985A ...
Page 537: ...Piping Installation Point SiUS34 801A_b 522 Appendix ...
Page 543: ...Pressure Sensor SiUS34 801A_b 528 Appendix ...
Page 563: ...SiUS34 801A_b iv Index ...