Refrigerant Flow for Each Operation Mode SiENBE37-701
98 Refrigerant Circuit
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
EVH
EVL
EVHS
EVLS
EVSC
Cooling
Unit
Indoor Unit
BS Unit
Liquid
Pipe
Dual
Pressure
Gas Pipe
Suction
Pipe
(Close)
Indoor Unit
BS Unit
Liquid
Pipe
Dual
Pressure
Gas Pipe
Suction
Pipe
EVH (Close)
EVLS (Close)
EVHS (Open)
EVL (Close)
EVSC
Indoor Unit
BS Unit
Liquid
Pipe
Dual
Pressure
Gas Pipe
Suction
Pipe
EVH
EVLS
EVHS
EVL
EVSC
Heating
Unit
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