Contents

TECHNICAL & SERVICE MANUAL
SAFETY PRECAUTIONS
Table of Contents
APPLICABLE INDOOR
1. OPERATING RANGE
2. SPECIFICATIONS
- 2-1. Unit Specifications
- 2-2. Major Component Specifications
- 2-3. Other Component Specifications
3. DIMENSIONAL DATA
4. REFRIGERANT FLOW DIAGRAM
- 4-1. Refrigerant Flow Diagram
5. PERFORMANCE DATA
- 5-1. Temperature Charts
- 5-2. Cooling Capacity
- 5-3. Cooling Capacity (Low Ambient)
- 5-4. Heating Capacity
6. ELECTRICAL DATA
- 6-1. Electric Wiring Diagrams
7. FUNCTIONS
- 7-1. Explanation of Functions
- 7-2. Protective Functions
8. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)
- 8-1. Precautions before Performing Inspection or Repair
- 8-2. Trouble Diagnosis by Error Monitor Lamps
- 8-3. Checking the Outdoor System
- 8-4. Trouble Diagnosis of Each Part
- 8-5. Trouble Diagnosis of Fan Motor
9. REFRIGERANT R410A:SPECIAL PRECAUTIONS WHEN SERVICING UNIT
- 9-1. Characteristics of New Refrigerant R410A
- 9-2. Checklist before Servicing
- 9-3. Tools Specifically for R410A
- 9-4. Tubing Installation Procedures
- 9-5. In Case of Compressor Malfunction
- 9-6. In Case Refrigerant is Leaking
- 9-7. Charging Additional Refrigerant
- 9-8. Retro-Fitting Existing Systems
APPENDIX A:INSTALLATION INSTRUCTIONS (CU-3KE19NBU / CU-4KE24NBU / CU-4KE31NBU)

Panasonic CU-3KE19NBU, CU-4KE24NBU Service Manual

Panasonic CU-3KE19NBU, CU-4KE24NBU manual cover

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Panasonic CU-3KE19NBU, CU-4KE24NBU Specification

The Panasonic CU-3KE19NBU and CU-4KE24NBU are advanced multi-split air conditioning systems designed to provide efficient climate control for residential and commercial spaces. Both models are part of Panasonic's ECOi EX series, which emphasizes energy efficiency and environmental sustainability.

The CU-3KE19NBU is equipped to handle up to three indoor units, making it ideal for medium-sized installations. It operates with a cooling capacity of 19,000 BTU and a heating capacity of 22,000 BTU. The system uses R-410A refrigerant, known for its eco-friendly properties and enhanced energy efficiency. The unit features an inverter-driven compressor that ensures precise temperature control and reduces energy consumption by adjusting the compressor speed according to the cooling demand.

On the other hand, the CU-4KE24NBU is designed to support up to four indoor units, suitable for larger spaces requiring more extensive climate control. It boasts a cooling capacity of 24,000 BTU and a heating capacity of 27,000 BTU. Like the CU-3KE19NBU, it also utilizes R-410A refrigerant and incorporates an inverter technology for optimal performance and energy savings.

Both systems offer quiet operation, advanced air purification features, and user-friendly controls, making them versatile solutions for various environmental conditions. They are compatible with a range of indoor unit types, including wall-mounted, ducted, and cassette units, allowing for flexible installation options. Additionally, these units are designed with easy maintenance in mind, featuring accessible components and a self-diagnostic function to simplify troubleshooting. With their robust performance and environmentally conscious design, the Panasonic CU-3KE19NBU and CU-4KE24NBU models are excellent choices for efficient and reliable air conditioning.

Panasonic CU-3KE19NBU, CU-4KE24NBU F.A.Q.

How do I perform a basic cleaning of the Panasonic CU-3KE19NBU unit?

To clean the Panasonic CU-3KE19NBU, turn off the unit and unplug it. Use a soft, dry cloth to wipe the exterior. For the air filters, remove them and wash with lukewarm water, then allow them to dry completely before reinserting.

What should I do if the CU-4KE24NBU is not cooling effectively?

First, ensure that the temperature settings are correct and that the doors and windows are closed. Check if the air filter is clean and that there are no obstructions near the outdoor unit. If the issue persists, contact a professional technician.

How often should I schedule maintenance checks for my Panasonic CU-3KE19NBU?

It is recommended to have professional maintenance checks at least once a year to ensure optimal performance and longevity of your CU-3KE19NBU unit.

What is the correct procedure for resetting the CU-4KE24NBU air conditioner?

To reset the CU-4KE24NBU, turn off the unit using the remote control and then unplug it from the power source for at least 30 seconds. Plug it back in and turn it on to complete the reset process.

Why is there water leaking from my Panasonic CU-3KE19NBU indoor unit?

Water leakage can be due to a clogged condensate drain line or a dirty air filter. Clean the filter and ensure the drain line is clear. If the problem continues, contact a technician for assistance.

Can I install the Panasonic CU-4KE24NBU unit myself?

Installation of the CU-4KE24NBU should be performed by a qualified HVAC technician to ensure safety and compliance with local regulations. Attempting self-installation can void the warranty.

What should I do if the remote control for my CU-3KE19NBU is not working?

First, replace the batteries in the remote control. If it still does not work, ensure there are no obstructions between the remote and the unit, and try resetting the remote. If issues persist, consider contacting Panasonic support.

How can I improve the energy efficiency of my CU-4KE24NBU air conditioner?

To enhance energy efficiency, keep the air filters clean, ensure the room is properly insulated, use energy-saving modes, and schedule regular maintenance checks.

Is it normal for the CU-3KE19NBU to make noise during operation?

Some noise is normal during operation, such as the sound of the fan or compressor. However, if you hear unusual sounds like rattling or buzzing, it may indicate a problem that requires professional inspection.

What are the steps to set the timer function on my CU-4KE24NBU unit?

To set the timer, press the 'Timer' button on the remote control. Use the up and down arrows to set the desired time, then press the 'Set' button to confirm. The unit will turn on or off automatically at the set time.