Panasonic CU-4KE31NBU, CU-4KE24NBU, CU-3KE19NBU service manual Prohibit

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Warning

If refrigerant gas blows off during the work, do not touch the refrigerant gas as it may cause frostbite.

 

 

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If refrigerant gas leaks during the work, ventilate the room.

 

If refrigerant gas catches fire, harmful gas may be generated.

 

 

 

Do not mix any gas other than the specified refrigerant gas in the refrigerating cycle.

 

If air or other contaminants mix with the gas, pressure will become extremely high in the refrigerating cycle,

 

which may cause a unit breakdown."

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When the welded section of the compressor intake or discharge pipe is to be disconnected, perform it in

 

a well-ventilated place after sufficiently recovering the refrigerant gas.

 

Any residue gas may jet out refrigerant or refrigerating machine oil, which may cause an injury.

 

 

 

When the work is to be performed in a high place (About 2 meters or more), make sure to wear a safety helmet,

 

gloves and safety belt. Insufficient safety gear may cause a serious injury in case of a fall.

 

 

 

When the unit is to be relocated, confirm that the new installation location has sufficient strength for the weight of the unit.

 

Insufficient strength of the installation location and incomplete installation work may cause an injury due to

 

the unit falling.

 

 

 

When the remote controller batteries are replaced, dispose of the old batteries out of the reach of children.

 

If a child swallows a battery, make sure that the child gets immediate medical attention.

 

 

 

Caution

Do not wash the air conditioner with water, as this may cause an electric shock or fire. Prohibit

For the repair work in places with high humidity or moisture, make sure to ground the unit.

Failure to do so may cause an electric shock.

Confirm that the component attachment position, wiring condition, soldering condition and connector connection are normal.

If not, it may cause overheating or fire.

Confirm that the temperature around the compressor is not too high, and then perform the repair work.

Failure to do so may cause a burn.

Perform welding work in a place with good ventilation.

If the work is performed in a poorly ventilated area, it might cause a lack of oxygen.

If the installation plate or attachment frame has deteriorated due to corrosion, etc., replace it.

Failure to do so may cause an injury due to the unit falling.

When the cleaning is to be performed, make sure to turn off the power and pull out the plug.

Touching the fan that is rotating at high speed may result in an injury.

When the indoor unit is to be removed, do not place it on an incline.

Doing so may cause wet furniture because water left inside may trickle down.

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Do not hold the sharp end of the unit or the aluminum fins, as it may cause an injury to your hand or finger. Prohibit

After repairs, make sure to measure the insulation resistance and confirm that the value is 1 Mohm or more.

Any insulation error may cause an electric shock.

After repairs, make sure to check the drainage of the indoor unit.

Inappropriate drainage may cause wet furniture and floors due to water leakage.

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Contents DC Inverter MULTI-SYSTEM AIR Conditioner Safety Precautions Prohibit Table of Contents Appendix a Semi-Concealed Type Wall Mounted TypeOperating Range Duct Less Type Rated 230V Unit SpecificationsOutdoor Unit CU-3KE19NBU Indoor Unit CS-MKE9NKU ×Indoor Unit Outdoor Unit208V CU-4KE24NBU Running Amperes 10.1 Running Amperes 10.0 11.1 CU-4KE31NBU Running Amperes 12.3 10.3 Running Amperes 12.7 11.4 Outdoor Unit Major Component SpecificationsOutdoor Unit CU-4KE24NBU Outdoor Unit CU-4KE31NBU CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU Other Component SpecificationsDimensional Data Unit inchmm 852-0-0010-20400-0 Unit inchmm 852-0-0010-20300-0 Refrigerant Flow Diagram Insulation of Refrigerant TubingIndoor unit Outdoor unit Valve Narrow tube Curve because it can cause the tube to break or crack Temperature Charts Temperature Charts CU-3KE19NBUIndoor Unit CS-MKE7NKU × F21 Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE12NKU × Heating CharacteristicsIndoor Unit CS-MKE18NKU × Indoor Unit CS-MKE9NB4U × Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE12NB4U × Indoor Unit CS-KE12NB4UW × Temperature Charts CU-4KE24NBU 188 Lo fan Hi fan HH fan Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE12NKU × Indoor Unit CS-MKE18NKU × Indoor Unit CS-MKE24NKU × 23C 73F Current 21C Temp 70F 17C Air Indoor 63F Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE12NB4U × Indoor Unit CS-KE12NB4UW × Temperature Charts CU-4KE31NBU Wide 362 Pressure 290 High 218 Outdoor air temperature F C 73F 23C Temp Indoor 73F 23C Air Temp 86F 30C Temp Air Indoor 63F Wide 362 Current Indoor Outdoor Cooling CapacityCS-MKE12NB4U × Power Supply 230V Single Phase 60Hz Cooling CapacityCS-MKE9NKU × CS-KE18NB4UW + CS-MKE12NB4U + CS-MKE12NB4U 30,600 BTU/h CS-MKE9NB4U × Cooling Capacity Low Ambient TC Total Cooling Capacity BTU/h ENT. TEMP. o F o C Ambient TEMP. o F o C 12.8 23,390 23,310 18,570 22,160 24,260 30,760 22,560 28,790 22,730 TH Total Heating Capacity BTU/h Heating CapacityPower Supply 230V Single Phase 60Hz Heating Capacity 29,200 BTU/h 28,400 BTU/h 32,000 BTU/h 000 CFM Outdoor Unit CU-3KE19NBU 8FA2-5251-11700-1 Electric Wiring DiagramsOutdoor Unit CU-4KE24NBU 8FA2-5251-11500-1 Outdoor Unit CU-4KE31NBU 8FA2-5251-11300-1 Explanation of Functions FunctionsStop Cool Frequency control Fluctuation fanFluctuation fan Low Ambient Cooling Operation Non-stop defrosting Clean defrostProtective Functions Defrost Detection and ReleaseCurrent control Current ControlDescription of function Automatic frequency controlControl at Heat Start-up Compressor Temperature ControlReset conditions Low Start CurrentPrecautions before Performing Inspection or Repair Troubleshooting Before Calling for ServiceTrouble Diagnosis by Error Monitor Lamps Location of the Error Monitor LampsDisplay of the Error Monitor Lamps Checking the defrost operation Work procedure Check items unit operationChecking the Outdoor System Checking the outdoor unitTrouble Diagnosis of Each Part Problems of Each Part and Inspection PointsInspection Points for Each Part CU-3KE19NBU MV0 MV1 MV2 CU-4KE24NBU CU-4KE31NBU Electric expansion valveBranch tubing temperature sensor BreakerRefrigerant gas pressure Trouble Diagnosis of Fan Motor Diagnostic procedureDiagnostic results Remedy for symptom 3 toComponents mixing proportions Characteristics of New Refrigerant R410AWhat is New Refrigerant R410A? CharacteristicsChecklist before Servicing Tools Specifically for R410A Tubing Installation ProceduresCase of Compressor Malfunction Procedure for Replacing CompressorR410A from changing Amount in the charging cylinder is less than 20%Example To prevent the compositionCase Refrigerant is Leaking Welding leaking pointsRecharging Use of Existing Units When Tubes are ExtendedCharging Additional Refrigerant Retro-Fitting Existing SystemsPage 852-6-4190-584-00-2 For Outdoor Unit ContentsPlease Read Before Starting ‡ 8VHWKHIODUHPHWKRGIRUFRQQHFWLQJWXELQJ Fins of the outdoor unit. You may get injuredGeneral For ceiling-mounted cassette units Installation Site SelectionIndoor Unit For wall-mounted unitsH1, H2, H3, H4 Connecting Indoor Units Connecting indoor unit for CU-3KE19NBUConnecting indoor unit for CU-4KE24NBU 815.88mm Locally purchased Connecting indoor unit for CU-4KE31NBU CS-MKE24NKU Back Baffle Plate for the Outdoor UnitIt is recommended to use baffle plates FrontAir Discharge Baffle Air Intake BafflePrecautions for installation CU-4KE31NBU Outer Dimensions of Outdoor UnitCU-3KE19NBU CU-4KE24NBUNever install only a single indoor unit Diagram of Outdoor Unit InstallationInstallation Process Flaring Procedure with a Flare ToolUse of the Flaring Method Tubing Connections To 0.5 mm Adjust so that the amount of tube For ceiling-mounted cassette units Insulation of Refrigerant TubingTo prevent heat loss and wet floors due to dripping of con  For wall-mounted unitsFinishing the Installation Air Purging Air Purging with a Vacuum Pump for Test Run Adapter manual, and use the adapter correctly External diameter of service port R410A 5/16If pump-down is not possible What is pump-down?Pump-down procedure  Pump DownWiring Instructions General Precautions on WiringRecommended Wire Length and Diameter Disconnect switch may be required by national or local codes For Indoor Unit How to connect wiring to the terminalFor Outdoor Unit  For solid core wiring or F-cable  For stranded wiringIndoor unit C Wiring Instructions for the Outdoor UnitIndoor unit D Indoor unit BChecking tubing and wiring Test RunPerforming a test run Installation Check Sheet Connecting a Home Automation DeviceDC1111-0
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CU-3KE19NBU, CU-4KE24NBU, CU-4KE31NBU specifications

The Panasonic CU-4KE24NBU, CU-4KE31NBU, and CU-3KE19NBU are high-efficiency air conditioning units that represent Panasonic's commitment to innovative climate control solutions. These models integrate advanced technologies to deliver superior performance, energy savings, and user comfort, making them ideal for both residential and commercial applications.

The CU-4KE24NBU, a part of the ECOi series, is designed for medium-sized spaces. It boasts an impressive cooling capacity, ensuring optimal temperature regulation. Its inverter technology adjusts the compressor speed according to the needs of the environment, resulting in reduced energy consumption and consistent comfort levels. The unit operates quietly, making it suitable for bedrooms, offices, or other noise-sensitive environments. Additionally, it features a robust air filtration system that improves indoor air quality by removing dust and allergens.

The CU-4KE31NBU offers a slightly higher capacity, making it perfect for larger areas. Like its counterpart, it utilizes inverter technology, which not only enhances energy efficiency but also minimizes wear and tear on the components, leading to a longer lifespan. Its multi-split capability allows for the connection of multiple indoor units to a single outdoor unit, providing flexibility in installation. The CU-4KE31NBU also integrates smart technology that allows users to control the system remotely via smartphones, giving them greater convenience and control over their environment.

For applications requiring a more compact option, the CU-3KE19NBU is an excellent choice. This model balances size and power, offering a competitive cooling capacity that can easily service small to medium-sized rooms. The unit is designed for easy installation and maintenance, featuring a lightweight construction that simplifies handling by technicians. The efficient inverter technology ensures that users benefit from lower energy bills while maintaining a consistent indoor climate.

All three models are equipped with Panasonic’s advanced refrigerants, which contribute to their eco-friendly performance. These refrigerants help reduce greenhouse gas emissions while maintaining high efficiency. Moreover, the units come with built-in diagnostic capabilities, allowing for quick detection of any issues, thus ensuring that the systems operate at peak efficiency throughout their lifespan.

In summary, the Panasonic CU-4KE24NBU, CU-4KE31NBU, and CU-3KE19NBU are exemplary air conditioning solutions that combine cutting-edge technology with user-friendly features, ensuring that they meet the varying needs of today's consumers while promoting energy efficiency and sustainability.