SiBE28-804
General Functionality
Functional Description
45
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.
Method
The table below describes the 4-way valve control operation.
Time chart
The time chart below illustrates the 4-way valve control.
When...
Then the 4-way valve connects the outlet of the compressor with...
Cooling
Outdoor heat exchanger
Heating
Indoor heat exchanger
In...
The 4-way valve is...
Heating, except for defrosting
ON
Cooling
Dry keep
Defrosting
OFF
Compressor
4-way valve
Defrosting
Unit mode
ON
OFF
OFF
ON
OFF
ON
Heating
Cooling/Dry
Summary of Contents for FHQ100BUV1B x 2
Page 13: ...SiBE28 804 2 ...
Page 19: ...Model Name and Power Supply SiBE28 804 8 General Information ...
Page 29: ...Specifications SiBE28 804 18 Specifications ...
Page 33: ...Wired Remote Controller SiBE28 804 22 Remote Controller 1 2 Installation ...
Page 34: ...SiBE28 804 Wired Remote Controller Remote Controller 23 ...
Page 93: ...Outdoor Unit Fan Speed Control SiBE28 804 82 Functional Description ...
Page 131: ...Test Run and Operation Data SiBE28 804 120 Test Operation ...
Page 251: ...Troubleshooting by Remote Controller Display LED Display SiBE28 804 240 Troubleshooting ...
Page 277: ...PCB Layout SiBE28 804 266 Appendix ...
Page 297: ...RZQ100 140C7 RZQS125 140C7V1B SiBE28 804 286 Removal Procedure ...
Page 311: ...SiBE28 804 iv Index ...