Table of Contents
Advertisement
TECHNICAL & SERVICE MANUAL
OUTDOOR UNIT : CU-3KE19NBU
DC INVERTER MULTI-SYSTEM AIR CONDITIONER
CU-3KE19NBU
CU-4KE24NBU
CU-4KE31NBU
CU-4KE24NBU
CU-4KE31NBU
Capacity at 230V
Outdoor Model No.
19,100 BTU/h
CU-3KE19NBU
23,200 BTU/h
CU-4KE24NBU
30,600 BTU/h
CU-4KE31NBU
Product Code No.
1 852 361 27
1 852 361 28
1 852 361 29
< Applicable Indoor Units >
Wall mounted type
CS-MKE7NKU
CS-MKE9NKU
CS-MKE12NKU
CS-MKE18NKU
CS-MKE24NKU
Semi-concealed type
CS-MKE9NB4U & CZ-18BT1U
CS-MKE12NB4U & CZ-18BT1U
CS-KE12NB4UW & CZ-18BT1U
IMPORTANT
These air conditioners employ new
refrigerant R410A.
Pay special attention when
servicing the unit.
REFERENCE NO.
SM
700878
Advertisement
Chapters
Table of Contents
Related Manuals for Panasonic CU-4KE24NBU
Summarization of Contents
2. SPECIFICATIONS
2-1. Unit Specifications
Detailed specifications for each outdoor unit model.
2-2. Major Component Specifications
Technical details of key components like compressor, fan motor, etc.
2-3. Other Component Specifications
Specifications for sensors and other minor components.
4. REFRIGERANT FLOW DIAGRAM
4-1. Refrigerant Flow Diagram
Schematic illustrating the refrigerant flow path in the system.
5. PERFORMANCE DATA
5-1. Temperature Charts
Performance charts showing operational data at various temperatures.
5-2. Cooling Capacity
Tables detailing cooling capacity under different conditions.
5-3. Cooling Capacity (Low Ambient)
Cooling capacity data for low ambient temperature operations.
5-4. Heating Capacity
Tables detailing heating capacity under different conditions.
6. ELECTRICAL DATA
6-1. Electric Wiring Diagrams
Diagrams showing electrical connections for the outdoor unit.
7. FUNCTIONS
7-1. Explanation of Functions
Description of various operational modes and functions.
7-2. Protective Functions
Explanation of safety features and protective operations.
8. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)
8-1. Precautions before Performing Inspection or Repair
Safety guidelines before starting troubleshooting or repair work.
8-2. Trouble Diagnosis by Error Monitor Lamps
Interpreting error codes indicated by monitor lamps.
8-3. Checking the Outdoor System
Procedures for checking the outdoor unit's functionality.
8-4. Trouble Diagnosis of Each Part
Identifying common problems and inspection points for components.
8-5. Trouble Diagnosis of Fan Motor
Troubleshooting steps for the outdoor DC fan motor.
9. REFRIGERANT R410A:
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
Guidelines for handling and servicing units with R410A refrigerant.
9-1. Characteristics of New Refrigerant R410A
Details on R410A refrigerant composition, properties, and handling.
9-2. Checklist before Servicing
Pre-service checks including tools and tubing precautions for R410A.
9-3. Tools Specifically for R410A
List of specialized tools required for servicing R410A systems.
9-4. Tubing Installation Procedures
Steps for proper installation of tubing, including flare and sealing.
9-5. In Case of Compressor Malfunction
Procedure for replacing a compressor in R410A units.
9-6. In Case Refrigerant is Leaking
Steps for detecting, repairing, and recharging refrigerant leaks.
9-7. Charging Additional Refrigerant
Guidelines for adding refrigerant, especially when tubes are extended.
9-8. Retro-Fitting Existing Systems
Precautions for using R410A with existing units and tubing.
APPENDIX A INSTALLATION INSTRUCTIONS
1. GENERAL
Overview of installation requirements, tools, and materials.
2. INSTALLATION SITE SELECTION
Guidelines for choosing appropriate locations for indoor and outdoor units.
3. INSTALLATION PROCESS
Step-by-step instructions for installing tubing, wiring, and insulation.
4. AIR PURGING
Procedure for removing air and moisture from the refrigerant system.
5. WIRING INSTRUCTIONS
Guidelines for electrical wiring, including precautions and diagrams.
6. TEST RUN
Procedures for performing a test run after installation.
7. CONNECTING A HOME AUTOMATION DEVICE
Instructions for connecting the unit to a home automation system.
8. INSTALLATION CHECK SHEET
A checklist to verify proper installation procedures.
Need help?
Do you have a question about the CU-4KE24NBU and is the answer not in the manual?
Questions and answers