4-Way Valve Control - Daikin SkyAir Service Manual

SiBE28-804

1.10 4-way Valve Control

Purpose The purpose of the 4-way valve control is to control how the superheated refrigerant passes
through the 4-way valve. The 4-way valve control carries out the changeover switching of the 4-
way valve. This changeover switching is only carried out during operation, because a certain
pressure difference is required to move the internal cylinder.
When...
Cooling
Heating
Method The table below describes the 4-way valve control operation.
In...
Heating, except for defrosting
Cooling
Dry keep
Defrosting
Time chart The time chart below illustrates the 4-way valve control.
Functional Description
Then the 4-way valve connects the outlet of the compressor with...
Outdoor heat exchanger
Indoor heat exchanger
ON
Compressor
OFF
Cooling/Dry
Unit mode
Heating
ON
Defrosting
OFF
ON
4-way valve
OFF
The 4-way valve is...
ON
OFF
General Functionality
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