Refrigerant Flow for Each Operation Mode
SiBE37-701_B
101
Refrigerant Circuit
Pressure equalizing when switching operation cooling / heating
1. When switching operation from to cooling to heating
First, the electronic 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 electronic expansion valve of the indoor unit is
opened to start the operation as a heating circuit.
In cooling
operation
In equalization
To heating
operation
Indoor Unit
BS Unit
Cooling
Unit
EVSC
Liquid
Pipe
EVHS
EVH
EVLS
EVL
Dual
Pressure
Gas Pipe
Suction
Pipe
Indoor Unit
BS Unit
EVSC
Liquid
Pipe
EVHS
(Open)
EVH
(Close)
EVLS
(Close)
EVL (Close)
Dual
Pressure
Gas Pipe
Suction
Pipe
(Close)
Indoor Unit
BS Unit
Heating
Unit
EVSC
Liquid
Pipe
EVHS
EVH
EVLS
EVL
Dual
Pressure
Gas Pipe
Suction
Pipe
Summary of Contents for REYQ8-48PY1B
Page 1: ...Service Manual REYQ8 48PY1B R 410A Heat Recovery 50Hz SiBE37 701_B ...
Page 456: ...Piping Installation Point SiBE37 701_B 445 Appendix ...
Page 460: ...Example of connection SiBE37 701_B 449 Appendix ...
Page 476: ...Revision History Date News No Contents 2010 9 10 M 10011 Correction of service manual ...