Daikin RXYQ96PYDN Service Manual page 199

Refrigerant Flow for Each Operation Mode
2. When switching operation from heating to cooling
In heating
operation
In equalization
To cooling
operation
184
First, the electric expansion valve and the solenoid valve for EVHS, EVH, EVL and EVLS of the
indoor unit will be closed.
Next, open the EVLS, and it makes to balance the system pressure.
Finally, EVL and EVLS are opened and the electric expansion valve of the indoor unit is opened
to start the operation as a cooling circuit.
Indoor Unit
Heating
Unit
Indoor Unit
(Close)
In
equalization
Indoor Unit
Cooling
Unit
BS Unit
Liquid
Pipe
EVSC
EVHS
Dual
Pressure
Gas Pipe
EVH
EVL
Suction
Pipe
EVLS
BS Unit
Liquid
Pipe
EVSC
EVHS (Close)
Dual
Pressure
Gas Pipe
EVH (Close)
EVL (Close)
Suction
Pipe
EVLS (Open)
BS Unit
Liquid
Pipe
EVSC
EVHS
Dual
Pressure
Gas Pipe
EVH
EVL
Suction
Pipe
EVLS
VRVIII R-410A Heat Recovery 60Hz
SiUS34-801A_b