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ESIE02–01
Overview of the heating mode functions
Part 2 – Functional Description
2–45
3
2
4
5
1
3.6
4-way Valve Control
Applicable units
RYP71-250B
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 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.
Used input
The 4-way valve control uses the following inputs:
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 keep
Input
Connection on
indoor PCB
Connection on
outdoor PCB
Indoor air temperature R1T (auto changeover)
X19A
—
Outdoor heat exchanger temperature R2T (defrost)
—
X5A
Summary of Contents for FHC45BZ7V1
Page 1: ...ESIE02 01 Service Manual Sky Air R 407C B series SV p p p...
Page 2: ......
Page 3: ...ESIE02 01 Service Manual Sky Air R 407C B series SV p p p...
Page 4: ......
Page 16: ...Introduction ESIE02 01 xii 3 1 4 5...
Page 18: ...ESIE02 01 1 2 Part 1 System Outline 3 1 1 5...
Page 42: ...General Outline Outdoor Units ESIE02 01 1 26 Part 1 System Outline 3 1 1 4 5...
Page 49: ...ESIE02 01 General Outline Indoor Units Part 1 System Outline 1 33 3 1 4 5...
Page 72: ...General Outline Indoor Units ESIE02 01 1 56 Part 1 System Outline 3 1 1 4 5...
Page 86: ...Specifications ESIE02 01 1 70 Part 1 System Outline 3 1 1 4 5...
Page 110: ...ESIE02 01 1 94 Part 1 System Outline...
Page 130: ...Switch Box Layout ESIE02 01 1 114 Part 1 System Outline 3 1 1 4 5...
Page 180: ...PCB Layout ESIE02 01 1 164 Part 1 System Outline 3 1 1 4 5...
Page 182: ...ESIE02 01 2 2 Part 2 Functional Description 3 1 2 5...
Page 204: ...General Functionality ESIE02 01 2 24 Part 2 Functional Description 3 1 2 4 5...
Page 216: ...Overview of the cooling mode functions ESIE02 01 2 36 Part 2 Functional Description 3 1 2 4 5...
Page 232: ...ESIE02 01 3 2 Part 3 Troubleshooting 3 1 3 5...
Page 294: ...Error Codes System Malfunctions ESIE02 01 3 64 Part 3 Troubleshooting 3 1 3 4 5...