Panasonic CU-4KE31NBU User Manual

IMPORTANT
These air conditioners employ new
refrigerant R410A.
Pay special attention when
servicing the unit.
Wall mounted type
CS-MKE7NKU
CS-MKE9NKU
CS-MKE12NKU
CS-MKE18NKU
CS-MKE24NKU
< Applicable Indoor Units >
TECHNICAL & SERVICE MANUAL
OUTDOOR UNIT : CU-3KE19NBU
CU-4KE24NBU
CU-4KE31NBU
DC INVERTER MULTI-SYSTEM AIR CONDITIONER
Product Code No.
1 852 361 27
1 852 361 28
1 852 361 29
REFERENCE NO.
SM700878
Capacity at 230V
19,100 BTU/h
23,200 BTU/h
30,600 BTU/h
Outdoor Model No.
CU-3KE19NBU
CU-4KE24NBU
CU-4KE31NBU
CU-3KE19NBU
CU-4KE24NBU
CU-4KE31NBU
Semi-concealed type
CS-MKE9NB4U & CZ-18BT1U
CS-MKE12NB4U & CZ-18BT1U
CS-KE12NB4UW & CZ-18BT1U

Panasonic CU-4KE31NBU Specifications

General

Brand	Panasonic
Model	CU-4KE31NBU
Category	Air Conditioner
Language	English

Summary

Safety Precautions

When Wiring

Electrical shock hazards during wiring. Follow codes, ensure secure connections.

Applicable Indoor Units

1. Operating Range

2. Specifications

2-1. Unit Specifications

Technical data and specifications for outdoor units and their combinations.

2-2. Major Component Specifications

Detailed specifications for key components like compressors, fans, and heat exchangers.

2-3. Other Component Specifications

Specifications for sensors and other minor components used in the unit.

3. Dimensional Data

4. Refrigerant Flow Diagram

4-1. Refrigerant Flow Diagram

Diagram illustrating refrigerant flow paths for the outdoor unit.

5. Performance Data

5-1. Temperature Charts

Performance charts showing cooling and heating characteristics at various temperatures.

5-2. Cooling Capacity

Tables detailing cooling capacity under various indoor and outdoor temperature conditions.

5-3. Cooling Capacity (Low Ambient)

Cooling capacity data specifically for low ambient outdoor temperature operation.

5-4. Heating Capacity

Tables detailing heating capacity under various indoor and outdoor temperature conditions.

6. Electrical Data

6-1. Electric Wiring Diagrams

Schematics for electrical connections and wiring of the outdoor unit.

7. Functions

7-1. Explanation of Functions

Description of various operating modes and functional behaviors of the air conditioner.

7-2. Protective Functions

Explanation of safety features like defrost, current control, and freeze protection.

8. Troubleshooting (Before Calling for Service)

8-1. Precautions before Performing Inspection or Repair

Safety guidelines for handling electronic circuits and high-voltage components during service.

8-2. Trouble Diagnosis by Error Monitor Lamps

Interpreting error codes indicated by monitor lamps on the control board.

8-3. Checking the Outdoor System

Procedures for verifying the operational status of the outdoor unit and its components.

8-4. Trouble Diagnosis of Each Part

Mapping common problems to specific parts and inspection points for diagnosis.

8-5. Trouble Diagnosis of Fan Motor

Troubleshooting steps for diagnosing issues with the outdoor fan motor.

9. Refrigerant R410A: Special Precautions When Servicing Unit

9-1. Characteristics of New Refrigerant R410A

Properties and handling guidelines for R410A refrigerant during servicing.

9-2. Checklist before Servicing

Pre-service checks and tool requirements specific to R410A.

9-3. Tools Specifically for R410A

List of specialized tools required for servicing R410A systems.

9-5. In Case of Compressor Malfunction

Procedure for replacing a malfunctioning compressor, including refrigerant handling.

9-6. In Case Refrigerant is Leaking

Steps for detecting, repairing, and recharging refrigerant after a leak.

9-7. Charging Additional Refrigerant

Guidelines for adding refrigerant, especially when extending tubing.

Appendix A Installation Instructions