Panasonic CU-4KE24NBU, CU-4KE31NBU, CU-3KE19NBU service manual CS-MKE9NB4U ×

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Outdoor Unit

: CU-4KE31NBU

 

 

 

 

 

 

 

 

Indoor Unit

: CS-MKE9NB4U × 4

 

 

 

 

 

 

 

 

Power Supply : 230V Single Phase 60Hz

 

 

 

 

 

 

 

 

< Cooling Capacity >

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RATING CAPACITY:

28,600 BTU/h

 

AIR FLOW RATE:

883 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

28,830

27,880

26,840

26,270

21,300

15,500

 

 

72

(22.2)

 

SHC

22,560

22,210

21,700

21,360

19,130

15,500

 

59

76

(24.4)

 

SHC

25,810

25,470

24,960

24,610

21,300

15,500

 

(15.0)

80

(26.7)

 

SHC

28,830

27,880

26,840

26,270

21,300

15,500

 

 

84

(28.9)

 

SHC

28,830

27,880

26,840

26,270

21,300

15,500

 

 

88

(31.1)

 

SHC

28,830

27,880

26,840

26,270

21,300

15,500

 

 

 

 

 

TC

29,960

29,000

27,940

27,440

21,790

15,830

 

 

72

(22.2)

 

SHC

18,780

18,270

17,930

17,580

15,360

12,960

 

63

76

(24.4)

 

SHC

22,040

21,700

21,180

21,010

18,610

15,830

 

(17.2)

80

(26.7)

 

SHC

25,470

25,130

24,610

24,440

21,790

15,830

 

 

84

(28.9)

 

SHC

28,730

28,390

27,870

27,440

21,790

15,830

 

 

88

(31.1)

 

SHC

29,960

29,000

27,940

27,440

21,790

15,830

 

 

 

 

 

TC

31,060

30,090

29,010

#

28,600

22,220

16,110

 

 

72

(22.2)

 

SHC

14,840

14,500

13,980

13,810

11,410

9,180

 

67

76

(24.4)

 

SHC

18,100

17,760

17,410

17,240

14,670

12,440

 

(19.4)

80

(26.7)

 

SHC

21,530

21,180

20,840

20,670

18,100

15,870

 

 

84

(28.9)

 

SHC

24,780

24,440

24,100

23,930

21,360

16,110

 

 

88

(31.1)

 

SHC

28,210

27,700

27,360

27,180

22,220

16,110

 

 

 

 

 

TC

32,080

31,110

30,020

29,730

22,560

16,340

 

 

72

(22.2)

 

SHC

10,730

10,380

10,040

9,870

7,470

5,410

 

71

76

(24.4)

 

SHC

13,980

13,640

13,300

13,130

10,730

8,670

 

(21.7)

80

(26.7)

 

SHC

17,410

17,070

16,730

16,560

14,160

12,100

 

 

84

(28.9)

 

SHC

20,670

20,330

19,980

19,810

17,410

15,360

 

 

88

(31.1)

 

SHC

23,930

23,580

23,240

23,240

20,670

16,340

 

 

 

 

 

TC

32,920

31,940

30,850

30,690

22,770

16,470

 

75

76

(24.4)

 

SHC

10,040

9,700

9,360

9,360

6,780

4,900

 

(23.9)

80

(26.7)

 

SHC

13,470

13,130

12,780

12,780

10,210

8,330

 

 

84

(28.9)

 

SHC

16,730

16,380

16,040

16,040

13,470

11,760

 

 

88

(31.1)

 

SHC

19,980

19,640

19,300

19,300

16,730

15,010

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 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 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 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 ServiceLocation of the Error Monitor Lamps Trouble Diagnosis by 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 valveBreaker Branch tubing temperature sensorRefrigerant 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 compositionWelding leaking points Case Refrigerant is LeakingRecharging 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 unit for CU-3KE19NBU Connecting Indoor UnitsConnecting 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 InstallationFlaring Procedure with a Flare Tool Installation ProcessUse 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 unitsAir Purging Finishing the Installation 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 DownGeneral Precautions on Wiring Wiring InstructionsRecommended 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 BTest Run Checking tubing and wiringPerforming 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.