Panasonic CU-3KE19NBU, CU-4KE31NBU, CU-4KE24NBU service manual Cooling Capacity Low Ambient

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5-3. Cooling Capacity (Low Ambient)

Outdoor Unit : CU-3KE19NBU

Indoor Unit : CS-MKE9NKU × 3

Power Supply : 230V Single Phase 60Hz

< Cooling Capacity (Low Ambient) >

RATING CAPACITY:

18,600 BTU/h

 

AIR FLOW RATE:

777 CFM

INDOOR

 

 

 

OUTDOOR

 

 

 

ENT. TEMP.oF (oC)

 

 

 

AMBIENT TEMP.oF (oC)

 

 

WB

DB

 

 

 

15

25

35

45

55

 

 

 

 

 

(-9.4)

(-3.9)

(1.7)

(7.2)

(12.8)

 

 

TC

 

 

19,030

18,900

18,890

18,960

18,810

 

72 (22.2)

SHC

 

 

16,240

18,900

16,240

16,240

16,090

59

76 (24.4)

SHC

 

 

18,950

18,900

18,800

18,950

18,800

(15.0)

80 (26.7)

SHC

 

 

19,030

18,900

18,890

18,960

18,810

 

84 (28.9)

SHC

 

 

19,030

18,900

18,890

18,960

18,810

 

88 (31.1)

SHC

 

 

19,030

18,900

18,890

18,960

18,810

 

 

TC

 

 

19,430

19,350

19,410

19,580

19,480

 

72 (22.2)

SHC

 

 

13,070

19,350

13,070

13,070

13,070

63

76 (24.4)

SHC

 

 

15,780

19,350

15,780

15,780

15,780

(17.2)

80 (26.7)

SHC

 

 

18,500

19,350

18,500

18,650

18,500

 

84 (28.9)

SHC

 

 

19,430

19,350

19,410

19,580

19,480

 

88 (31.1)

SHC

 

 

19,430

19,350

19,410

19,580

19,480

 

 

TC

 

 

19,740

19,710

19,870

20,150

20,120

 

72 (22.2)

SHC

 

 

9,900

19,710

9,900

10,050

10,050

67

76 (24.4)

SHC

 

 

12,470

19,710

12,620

12,620

12,620

(19.4)

80 (26.7)

SHC

 

 

15,330

19,710

15,330

15,480

15,480

 

84 (28.9)

SHC

 

 

18,050

19,710

18,050

18,200

18,200

 

88 (31.1)

SHC

 

 

19,740

19,710

19,870

20,150

20,120

 

 

TC

 

 

19,900

19,950

20,220

20,640

20,700

 

72 (22.2)

SHC

 

 

6,430

19,950

6,580

6,730

6,730

71

76 (24.4)

SHC

 

 

9,150

19,950

9,300

9,450

9,450

(21.7)

80 (26.7)

SHC

 

 

11,860

19,950

12,010

12,160

12,160

 

84 (28.9)

SHC

 

 

14,580

19,950

14,730

14,880

14,880

 

88 (31.1)

SHC

 

 

17,290

19,950

17,440

17,600

17,600

 

 

TC

 

 

19,890

20,020

20,430

21,000

21,140

75

76 (24.4)

SHC

 

 

5,830

20,020

5,980

6,130

6,280

(23.9)

80 (26.7)

SHC

 

 

8,690

20,020

8,840

9,000

9,000

 

84 (28.9)

SHC

 

 

11,260

20,020

11,560

11,710

11,710

 

88 (31.1)

SHC

 

 

13,970

20,020

14,130

14,280

14,430

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

NOTE

1.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.

2.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 Indoor unit Outdoor unit Refrigerant Flow DiagramInsulation of Refrigerant Tubing Valve Narrow tube Curve because it can cause the tube to break or crack Indoor Unit CS-MKE7NKU × Temperature ChartsTemperature Charts CU-3KE19NBU 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 RepairDisplay of the Error Monitor Lamps Trouble Diagnosis by Error Monitor LampsLocation 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-4KE31NBURefrigerant gas pressure Branch tubing temperature sensorBreaker 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 changingRecharging Case Refrigerant is LeakingWelding leaking points 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-4KE24NBU Connecting Indoor UnitsConnecting indoor unit for CU-3KE19NBU 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 unitUse of the Flaring Method Installation ProcessFlaring Procedure with a Flare Tool 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 units Air Purging with a Vacuum Pump for Test Run Finishing the InstallationAir Purging 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 possibleRecommended Wire Length and Diameter Wiring InstructionsGeneral Precautions on Wiring 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 CPerforming a test run Checking tubing and wiringTest 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.

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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.

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