SiENBE37-701 Refrigerant Flow for Each Operation Mode
Refrigerant Circuit 99
2. When switching operation from heating to cooling
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.
In heating
operation
In equalization
To cooling
operation
Indoor Unit
BS Unit
Liquid
Pipe
Dual
Pressure
Gas Pipe
Suction
Pipe
EVH
EVLS
EVHS
EVL
EVSC
Heating
Unit
Indoor Unit
BS Unit
Liquid
Pipe
Dual
Pressure
Gas Pipe
Suction
Pipe
EVH (Close)
EVLS (Open)
EVHS (Close)
EVL (Close)
EVSC
In
equalization
(Close)
Indoor Unit
BS Unit
Liquid
Pipe
Dual
Pressure
Gas Pipe
Suction
Pipe
EVH
EVLS
EVHS
EVL
EVSC
C
ooling
Unit
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