Panasonic CU-4KE24NBU, CU-4KE31NBU, CU-3KE19NBU service manual CS-MKE9NKU ×

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Outdoor Unit

: CU-4KE24NBU

 

 

 

 

 

 

 

 

Indoor Unit

: CS-MKE9NKU × 3

 

 

 

 

 

 

 

 

Power Supply : 230V Single Phase 60Hz

 

 

 

 

 

 

 

 

< Cooling Capacity >

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RATING CAPACITY:

23,200 BTU/h

 

AIR FLOW RATE:

777 CFM

 

INDOOR

 

 

 

 

 

OUTDOOR

 

 

 

 

 

ENT. TEMP. o F ( o C)

 

 

 

AMBIENT TEMP. o F ( o C)

 

 

 

WB

 

DB

 

 

65

75

85

95

105

115

 

 

 

 

 

 

(18.3)

(23.9)

(29.4)

(35.0)

(40.6)

(46.1)

 

 

 

 

 

TC

23,420

22,640

21,790

21,190

20,170

15,430

 

 

72

(22.2)

 

SHC

18,350

17,900

17,600

17,290

16,840

14,580

 

59

76

(24.4)

 

SHC

21,070

20,610

20,160

19,860

19,410

15,430

 

(15.0)

80

(26.7)

 

SHC

23,420

22,640

21,790

21,190

20,170

15,430

 

 

84

(28.9)

 

SHC

23,420

22,640

21,790

21,190

20,170

15,430

 

 

88

(31.1)

 

SHC

23,420

22,640

21,790

21,190

20,170

15,430

 

 

 

 

 

TC

24,430

23,630

22,760

22,190

21,150

15,820

 

 

72

(22.2)

 

SHC

15,180

14,880

14,430

14,280

13,820

11,560

 

63

76

(24.4)

 

SHC

17,900

17,600

17,140

16,840

16,540

14,280

 

(17.2)

80

(26.7)

 

SHC

20,760

20,310

20,010

19,710

19,250

15,820

 

 

84

(28.9)

 

SHC

23,330

23,030

22,570

22,190

21,150

15,820

 

 

88

(31.1)

 

SHC

24,430

23,630

22,760

22,190

21,150

15,820

 

 

 

 

 

TC

25,430

24,620

23,730

#

23,200

21,680

16,170

 

 

72

(22.2)

 

SHC

12,010

11,710

11,410

11,260

10,660

8,540

 

67

76

(24.4)

 

SHC

14,730

14,430

14,130

13,820

13,220

11,260

 

(19.4)

80

(26.7)

 

SHC

17,600

17,290

16,840

16,690

16,090

13,970

 

 

84

(28.9)

 

SHC

20,160

19,860

19,560

19,410

18,800

16,170

 

 

88

(31.1)

 

SHC

22,880

22,570

22,270

21,970

21,370

16,170

 

 

 

 

 

TC

26,390

25,570

24,670

24,200

22,130

16,480

 

 

72

(22.2)

 

SHC

8,690

8,390

8,090

7,940

7,190

5,370

 

71

76

(24.4)

 

SHC

11,410

11,110

10,810

10,660

9,900

7,940

 

(21.7)

80

(26.7)

 

SHC

14,280

13,970

13,520

13,370

12,620

10,810

 

 

84

(28.9)

 

SHC

16,840

16,540

16,240

16,090

15,330

13,520

 

 

88

(31.1)

 

SHC

19,560

19,250

18,950

18,800

18,050

16,090

 

 

 

 

 

TC

27,200

26,380

25,470

25,070

22,460

16,700

 

75

76

(24.4)

 

SHC

8,240

7,940

7,640

7,490

6,580

4,920

 

(23.9)

80

(26.7)

 

SHC

10,960

10,660

10,350

10,350

9,450

7,640

 

 

84

(28.9)

 

SHC

13,670

13,370

13,070

12,920

12,160

10,350

 

 

88

(31.1)

 

SHC

16,390

16,090

15,780

15,630

14,880

13,070

TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)

NOTE

1.Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB

:Outdoor Ambient Temp. 95 °F (35 °C) DB

2.Above data does not take Freeze Prevention Protection during cooling operation into account. For this reason, the value may vary from the actual cooling characteristics.

3.Above data represents the value when the operation frequency of a compressor is fixed.

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Contents DC Inverter MULTI-SYSTEM AIR Conditioner Safety Precautions Prohibit Table of Contents Appendix a Wall Mounted Type Semi-Concealed TypeOperating Range Unit Specifications Outdoor Unit CU-3KE19NBUIndoor Unit CS-MKE9NKU × Duct Less Type Rated 230VOutdoor Unit Indoor 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 Major Component Specifications Outdoor UnitOutdoor Unit CU-4KE24NBU Outdoor Unit CU-4KE31NBU Other Component Specifications CU-3KE19NBU CU-4KE24NBU CU-4KE31NBUDimensional Data Unit inchmm 852-0-0010-20400-0 Unit inchmm 852-0-0010-20300-0 Insulation of Refrigerant Tubing Refrigerant Flow DiagramIndoor unit Outdoor unit Valve Narrow tube Curve because it can cause the tube to break or crack Temperature Charts CU-3KE19NBU Temperature ChartsIndoor Unit CS-MKE7NKU × F21 Heating Characteristics Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE12NKU ×Indoor 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 Cooling Capacity Indoor OutdoorPower Supply 230V Single Phase 60Hz Cooling Capacity CS-MKE12NB4U ×CS-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 Heating Capacity TH Total Heating Capacity BTU/hPower Supply 230V Single Phase 60Hz Heating Capacity 29,200 BTU/h 28,400 BTU/h 32,000 BTU/h 000 CFM Electric Wiring Diagrams Outdoor Unit CU-3KE19NBU 8FA2-5251-11700-1Outdoor Unit CU-4KE24NBU 8FA2-5251-11500-1 Outdoor Unit CU-4KE31NBU 8FA2-5251-11300-1 Functions Explanation of FunctionsStop Cool Fluctuation fan Frequency controlFluctuation fan Low Ambient Cooling Operation Clean defrost Protective FunctionsDefrost Detection and Release Non-stop defrostingCurrent Control Description of functionAutomatic frequency control Current controlCompressor Temperature Control Reset conditionsLow Start Current Control at Heat Start-upTroubleshooting Before Calling for Service Precautions before Performing Inspection or RepairLocation of the Error Monitor Lamps Trouble Diagnosis by Error Monitor LampsDisplay of the Error Monitor Lamps Work procedure Check items unit operation Checking the Outdoor SystemChecking the outdoor unit Checking the defrost operationProblems of Each Part and Inspection Points Trouble Diagnosis of Each PartInspection Points for Each Part Electric expansion valve CU-3KE19NBU MV0 MV1 MV2 CU-4KE24NBU CU-4KE31NBUBreaker Branch tubing temperature sensorRefrigerant gas pressure Diagnostic procedure Diagnostic resultsRemedy for symptom 3 to Trouble Diagnosis of Fan MotorCharacteristics of New Refrigerant R410A What is New Refrigerant R410A?Characteristics Components mixing proportionsChecklist before Servicing Tubing Installation Procedures Tools Specifically for R410AProcedure for Replacing Compressor Case of Compressor MalfunctionAmount in the charging cylinder is less than 20% ExampleTo prevent the composition R410A from changingWelding leaking points Case Refrigerant is LeakingRecharging When Tubes are Extended Charging Additional RefrigerantRetro-Fitting Existing Systems Use of Existing UnitsPage 852-6-4190-584-00-2 Contents For Outdoor UnitPlease Read Before Starting Fins of the outdoor unit. You may get injured ‡ 8VHWKHIODUHPHWKRGIRUFRQQHFWLQJWXELQJGeneral Installation Site Selection Indoor UnitFor wall-mounted units For ceiling-mounted cassette unitsH1, H2, H3, H4 Connecting indoor unit for CU-3KE19NBU Connecting Indoor UnitsConnecting indoor unit for CU-4KE24NBU 815.88mm Locally purchased Connecting indoor unit for CU-4KE31NBU CS-MKE24NKU Baffle Plate for the Outdoor Unit It is recommended to use baffle platesFront BackAir Intake Baffle Air Discharge BafflePrecautions for installation Outer Dimensions of Outdoor Unit CU-3KE19NBUCU-4KE24NBU CU-4KE31NBUDiagram of Outdoor Unit Installation Never install only a single indoor unitFlaring Procedure with a Flare Tool Installation ProcessUse of the Flaring Method To 0.5 mm Adjust so that the amount of tube Tubing ConnectionsInsulation of Refrigerant Tubing To prevent heat loss and wet floors due to dripping of con For wall-mounted units  For ceiling-mounted cassette unitsAir Purging Finishing the Installation Air Purging with a Vacuum Pump for Test Run External diameter of service port R410A 5/16 Adapter manual, and use the adapter correctlyWhat is pump-down? Pump-down procedure Pump Down If pump-down is not possibleGeneral Precautions on Wiring Wiring InstructionsRecommended Wire Length and Diameter Disconnect switch may be required by national or local codes How to connect wiring to the terminal For Outdoor Unit  For solid core wiring or F-cable For stranded wiring For Indoor UnitWiring Instructions for the Outdoor Unit Indoor unit DIndoor unit B Indoor unit CTest Run Checking tubing and wiringPerforming a test run Connecting a Home Automation Device Installation Check SheetDC1111-0
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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.