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CU-3KE19NBU, CU-4KE31NBU, CU-4KE24NBU Electrical Data, Electric Wiring Diagrams
Models:
CU-3KE19NBU
CU-4KE24NBU
CU-4KE31NBU
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Troubleshooting
Specifications
Cooling Characteristics
Install
Refrigerant Flow Diagram
Dimension
WARNING When Wiring
Problems of Each Part and Inspection Points
Reset conditions
Diagnostic procedure
Page 68
Image 68
6. ELECTRICAL DATA
6-1.
Electric Wiring Diagrams
Outdoor Unit
CU-3KE19NBU
8FA2-5251-11700-1
68
Page 67
Page 69
Page 68
Image 68
Page 67
Page 69
Contents
OUTDOOR UNIT : CU-3KE19NBU CU-4KE24NBU
CU-4KE31NBU
TECHNICAL & SERVICE MANUAL
Pay special attention when servicing the unit
SAFETY PRECAUTIONS
which may cause a unit breakdown
Table of Contents
SPECIFICATIONS
REFRIGERANT FLOW DIAGRAM
TROUBLESHOOTING BEFORE CALLING FOR SERVICE
APPENDIX A
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
9. REFRIGERANT R410A
Semi-ConcealedType
APPLICABLE INDOOR UNITS
Wall Mounted Type
1. OPERATING RANGE
Temperature
Indoor Air Intake Temp
Outdoor Air Intake Temp
2. SPECIFICATIONS
2-1.Unit Specifications
Type
Number of Connectable Indoor Units
Type
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
Type
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
Type
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
Type
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
Type
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
Type
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
Type
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
Type
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
2-2.Major Component Specifications
2-2-1.Outdoor Unit
Control PCB
Compressor
Control PCB
Compressor
Fan Motor
Heat Exchanger Coil
Control PCB
Compressor
Fan Motor
Heat Exchanger Coil
2-3.Other Component Specifications
Temperature F C
Temperature F C
Resistance k ohm
3. DIMENSIONAL DATA
Unit: inchmm 852-0-0010-11200-0
Unit inchmm
Unit inchmm
Insulation of Refrigerant Tubing
4. REFRIGERANT FLOW DIAGRAM
4-1.Refrigerant Flow Diagram
Outdoor unit
Insulation of Refrigerant Tubing
Indoor unit
Outdoor unit
Insulation of Refrigerant Tubing
Indoor unit
5. PERFORMANCE DATA
5-1.Temperature Charts
5-1-1.Temperature Charts CU-3KE19NBU
Indoor Unit CS-MKE9NKU×
Heating Characteristics
Cooling Characteristics
Indoor Unit CS-MKE18NKU×
Indoor Unit CS-MKE9NB4U×
Heating Characteristics
Cooling Characteristics
Outdoor Unit CU-3KE19NBU
Indoor Unit CS-MKE12NB4U×
Indoor Unit CS-KE12NB4UW×
5-1-2.Temperature Charts CU-4KE24NBU
Indoor Unit CS-MKE7NKU×
Indoor Unit CS-MKE9NKU×
wideat
wideat
current
Heating Characteristics
Cooling Characteristics
Outdoor Unit CU-4KE24NBU
Indoor Unit CS-MKE12NKU×
Cooling Characteristics
Heating Characteristics
1 Low pressure performance chart
1 High pressure performance chart
Indoor Unit CS-MKE24NKU×
Indoor Unit CS-MKE9NB4U×
Heating Characteristics
Cooling Characteristics
Outdoor Unit CU-4KE24NBU
Indoor Unit CS-MKE12NB4U×
Cooling Characteristics
Heating Characteristics
1 Low pressure performance chart
1 High pressure performance chart
5-1-3.Temperature Charts CU-4KE31NBU
Indoor Unit CS-MKE7NKU×
Indoor Unit CS-MKE9NKU×
Indoor Unit CS-MKE12NKU×
Indoor Unit CS-MKE18NKU×
Indoor Unit CS-MKE24NKU×
Cooling Characteristics
Heating Characteristics
1 Low pressure performance chart
1 High pressure performance chart
Indoor 70F
Indoor Unit CS-MKE12NB4U×
temp
Indoor Unit CS-KE12NB4UW×
5-2.Cooling Capacity
Power Supply : 230V Single Phase 60Hz
Outdoor Unit : CU-3KE19NBU
Indoor Unit : CS-MKE9NKU×
CU-3KE19NBU
CS-MKE12NB4U×
CU-4KE24NBU
CS-MKE9NKU×
CU-4KE24NBU
CS-KE18NB4UW+ CS-MKE12NB4U+ CS-MKE12NB4U
CU-4KE31NBU
CS-MKE9NKU×
CU-4KE31NBU
CS-MKE9NB4U×
5-3.Cooling Capacity Low Ambient
Power Supply : 230V Single Phase 60Hz
Outdoor Unit : CU-3KE19NBU
Indoor Unit CS-MKE9NKU×
CU-3KE19NBU
CS-MKE12NB4U×
CU-4KE24NBU
CS-MKE9NKU×
CU-4KE24NBU
CS-KE18NB4UW+ CS-MKE12NB4U+ CS-MKE12NB4U
CU-4KE31NBU
CS-MKE9NKU×
CU-4KE31NBU
CS-MKE9NB4U×
5-4.Heating Capacity
Power Supply : 230V Single Phase 60Hz
Outdoor Unit : CU-3KE19NBU
Indoor Unit : CS-MKE9NKU×
CU-3KE19NBU
CS-MKE12NB4U×
CU-4KE24NBU
CS-MKE9NKU×
CU-4KE24NBU
CS-KE18NB4UW+ CS-MKE12NB4U+ CS-MKE12NB4U
CU-4KE31NBU
CS-MKE9NKU×
CU-4KE31NBU
CS-MKE9NB4U×
6-1.Electric Wiring Diagrams
6. ELECTRICAL DATA
Outdoor Unit CU-4KE24NBU 8FA2-5251-11500-1
Outdoor Unit CU-4KE31NBU 8FA2-5251-11300-1
7. FUNCTIONS
7-1.Explanation of Functions
Clean defrost
Control/conditions
Unit operation
Explanation
Temperature of releasing
Fig.
Table
Control/conditions
Control/conditions
Unit operation
Explanation
SENSOR
1/f fluctuation fan
Fig.
< Low Ambient Cooling Operation >
7-2.Protective Functions
7-2-1.Defrost Detection and Release
7-2-2.Current Control
Description of function
1Automatic frequency control
2 Current control
7-2-4.Compressor Temperature Control
7-2-3.Low Start Current
7-2-5.Control at HEAT Start-up
Reset conditions
8. TROUBLESHOOTING BEFORE CALLING FOR SERVICE
8-2-2.Display of the Error Monitor Lamps
8-2.Trouble Diagnosis by Error Monitor Lamps
8-2-1.Location of the Error Monitor Lamps
8-3-2.Checking the defrost operation
8-3.Checking the Outdoor System
8-3-1.Checking the outdoor unit
8-4-1.Problems of Each Part and Inspection Points
8-4.Trouble Diagnosis of Each Part
8-4-2.Inspection Points for Each Part
1 Outdoor control circuit board
2 Fuse
3 Compressor
7 Electric expansion valve
10 Refrigerant gas pressure
8 Branch tubing temperature sensor
9 Breaker
8-5.Trouble Diagnosis of Fan Motor
Diagnostic procedure
Diagnostic results
Remedy for symptom 3 to
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
9-1.Characteristics of New Refrigerant R410A
9-1-1.What is New Refrigerant R410A?
9-1-3.Characteristics
9-2.Checklist before Servicing
Tubing precautions
Size of flare
No addition of compressor oil for R410A
9-4.Tubing Installation Procedures
9-3.Tools Specifically for R410A
9-5-1.Procedure for Replacing Compressor
9-5.In Case of Compressor Malfunction
Page
9-6.In Case Refrigerant is Leaking
9-7-1.When Tubes are Extended
9-7.Charging Additional Refrigerant
9-8. Retro-FittingExisting Systems
9-8-1.Use of Existing Units
Page
APPENDIX A INSTALLATION INSTRUCTIONS
CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU
Contents
For Outdoor Unit
SPECIAL PRECAUTIONS
In Case of Improper Installation
WARNING When Wiring
When Transporting
When Servicing
Others
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fins of the outdoor unit. You may get injured
1. General
2. Installation Site Selection
Max. Allowable Total
Limit of
Limit of Elevation
Required Amount
Outdoor unit
Indoor unit
Outdoor unit
3/89.52mm
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
5/815.88mm
CS-MKE24NKU
About
Air Intake Baffle
Air Discharge Baffle
Dimensions
Dimensions
3 Installation procedure
4 Precautions for installation
1. Air Intake Baffle
2. Air Discharge Baffle
unit: inch mm
2-5.Outer Dimensions of Outdoor Unit
Fig. 6a
Fig. 6b
2-6. Diagram of Outdoor Unit Installation
Indoor unit D
Indoor unit C Indoor unit B
Indoor unit C Indoor unit B
3. Installation Process
3-1. Embedding the Tubing and Wiring
D C B
3-4.Caution before Connecting Tubes Tightly
Fig.
Fig.
3-6.Insulation of Refrigerant Tubing
4. Air Purging
Air Purging with a Vacuum Pump for Test Run
Table
adapter manual, and use the adapter correctly
Fig.
Pump Down
gas without releasing it into the atmosphere
5. Wiring Instructions
5-1.General Precautions on Wiring
5-2.Recommended Wire Length and Diameter
Table
Each wire must be firmly connected
5-4.How to Connect Wiring to the Terminal
5-5.Wiring Instructions for the Outdoor Unit
Fig.
6. Test Run
Checking tubing and wiring
Performing a test run
Fig.
7. Connecting a Home Automation Device
8. Installation Check Sheet
DC1111-0