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Panasonic CU-4KS31NBU service manual OUTDOOR UNIT : CU-3KS19NBU CU-4KS24NBU, Capacity at

Models: CU-4KS31NBU

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TECHNICAL & SERVICE MANUAL

OUTDOOR UNIT : CU-3KS19NBU

CU-4KS24NBU

CU-4KS31NBU

DC INVERTER MULTI-SYSTEM AIR CONDITIONER

Capacity at 230V	Outdoor Model No.	Product Code No.

19,700 BTU/h	CU-3KS19NBU	1 852 361 24

25,400 BTU/h	CU-4KS24NBU	1 852 361 25

30,600 BTU/h	CU-4KS31NBU	1 852 361 26

CU-3KS19NBU

CU-4KS24NBU

CU-4KS31NBU

< Applicable Indoor Units >

Wall mounted type

CS-MKS7NKU

CS-MKS9NKU

CS-MKS12NKU

CS-MKS18NKU

CS-MKS24NKU

Semi-concealed type CS-MKS9NB4U & CZ-18BT1U CS-MKS12NB4U & CZ-18BT1U CS-KS18NB4UW & CZ-18BT1U

IMPORTANT

These air conditioners employ new refrigerant R410A.

Pay special attention when servicing the unit.

REFERENCE NO. SM700877

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Panasonic CU-4KS31NBU service manual OUTDOOR UNIT : CU-3KS19NBU CU-4KS24NBU, Technical & Service Manual, Capacity at

Contents

CU-4KS31NBU OUTDOOR UNIT : CU-3KS19NBU CU-4KS24NBUTECHNICAL & SERVICE MANUAL Pay special attention when servicing the unitSAFETY PRECAUTIONS which may cause a unit breakdown SPECIFICATIONS Table of ContentsREFRIGERANT FLOW DIAGRAM APPLICABLE INDOOR UNITS9. REFRIGERANT R410A SPECIAL PRECAUTIONS WHEN SERVICING UNITAPPENDIX A Wall Mounted Type APPLICABLE INDOOR UNITSSemi-ConcealedType Temperature 1. OPERATING RANGEIndoor Air Intake Temp Outdoor Air Intake Temp2-1.Unit Specifications 2. SPECIFICATIONSType Number of Connectable Indoor UnitsNumber of Connectable Indoor Units TypeNumber of Operatable Indoor Units Voltage RatingNumber of Connectable Indoor Units TypeNumber of Operatable Indoor Units Voltage RatingNumber of Connectable Indoor Units TypeNumber of Operatable Indoor Units Voltage RatingNumber of Connectable Indoor Units TypeNumber of Operatable Indoor Units Voltage RatingNumber of Connectable Indoor Units TypeNumber of Operatable Indoor Units Voltage RatingNumber of Connectable Indoor Units TypeNumber of Operatable Indoor Units Voltage RatingNumber of Connectable Indoor Units TypeNumber of Operatable Indoor Units Voltage RatingNumber of Connectable Indoor Units TypeNumber of Operatable Indoor Units Voltage Rating2-2-1.Outdoor Unit 2-2.Major Component SpecificationsControl PCB CompressorCompressor Control PCBFan Motor Heat Exchanger CoilCompressor Control PCBFan Motor Heat Exchanger CoilResistance k ohm 2-3.Other Component SpecificationsTemperature F C Resistance k ohmUnit: inchmm 852-0-0010-11500-0 3. DIMENSIONAL DATAUnit: inchmm 852-0-0010-20500-0 Unit: inchmm 852-0-0010-20600-0 4-1.Refrigerant Flow Diagram 4. REFRIGERANT FLOW DIAGRAMInsulation of Refrigerant Tubing Indoor unit Insulation of Refrigerant TubingOutdoor unit Indoor unit Insulation of Refrigerant TubingOutdoor unit 5-1.Temperature Charts 5. PERFORMANCE DATA5-1-1.Temperature Charts CU-3KS19NBU Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS9NKU× Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS12NKU× Cooling CharacteristicsOutdoor Unit CU-3KS19NBU Indoor Unit CS-MKS18NKU× Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS9NB4U× Page Page Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS7NKU× 5-1-2.Temperature Charts CU-4KS24NBU1 Low pressure performance chart Cooling Characteristics2 Operating current performance chart 3 Indoor discharge air performance chartOutdoor Unit CU-4KS24NBU Indoor Unit CS-MKS12NKU× Cooling Characteristics1 Low pressure performance chart Cooling Characteristics2 Operating current performance chart 3 Indoor discharge air performance chartOutdoor Unit CU-4KS24NBU Indoor Unit CS-MKS24NKU× 1 Low pressure performance chart Cooling Characteristics2 Operating current performance chart 3 Indoor discharge air performance chart1 Low pressure performance chart Cooling Characteristics2 Operating current performance chart 3 Indoor discharge air performance chart1 Low pressure performance chart Cooling Characteristics2 Operating current performance chart 3 Indoor discharge air performance chartCooling Characteristics 5-1-3.Temperature Charts CU-4KS31NBU1 Low pressure performance chart 2 Operating current performance chart1 Low pressure performance chart Cooling Characteristics2 Operating current performance chart 3 Indoor discharge air performance chartOutdoor Unit CU-4KS31NBU Indoor Unit CS-MKS12NKU× 1 Low pressure performance chart Cooling Characteristics2 Operating current performance chart 3 Indoor discharge air performance chartOutdoor Unit CU-4KS31NBU Indoor Unit CS-MKS24NKU× 1 Low pressure performance chart Cooling Characteristics2 Operating current performance chart 3 Indoor discharge air performance chart1 Low pressure performance chart Cooling Characteristics2 Operating current performance chart 3 Indoor discharge air performance chartPage Power Supply : 230V Single Phase 60Hz 5-2.Cooling CapacityOutdoor Unit : CU-3KS19NBU Indoor Unit : CS-MKS9NKU×CS-MKS12NB4U× CU-3KS19NBUCS-MKS9NKU × CU-4KS24NBUCS-KS18NB4UW+ CS-MKS12NB4U+ CS-MKS12NB4U CU-4KS24NBUCS-MKS9NKU × CU-4KS31NBUCS-MKS9NB4U× CU-4KS31NBUPower Supply : 230V Single Phase 60Hz 5-3.Cooling Capacity Low AmbientOutdoor Unit : CU-3KS19NBU Indoor Unit : CS-MKS9NKU×CS-MKS12NB4U× CU-3KS19NBUCS-MKS9NKU × CU-4KS24NBUCS-KS18NB4UW+ CS-MKS12NB4U+ CS-MKS12NB4U CU-4KS24NBUCS-MKS9NKU × CU-4KS31NBUCS-MKS9NB4U× CU-4KS31NBU6. ELECTRICAL DATA 6-1.Electric Wiring DiagramsOutdoor Unit CU-4KS24NBU 8FA2-5251-11600-1 Outdoor Unit CU-4KS31NBU 8FA2-5251-11400-1 7-1.Explanation of Functions 7. FUNCTIONSUnit operation Control/conditionsExplanation COOLControl/conditions 1/f fluctuation fanUnit operation Explanation< Low Ambient Cooling Operation > 7-2-1.Current Control 7-2.Protective FunctionsLow Start Current 7-2-27-2-3.Compressor Temperature Control 2 Current control8. TROUBLESHOOTING BEFORE CALLING FOR SERVICE 8-2-1.Location of the Error Monitor Lamps 8-2.Trouble Diagnosis by Error Monitor Lamps8-2-2.Display of the Error Monitor Lamps 8-3-1.Checking the outdoor unit 8-3.Checking the Outdoor System8-4.Trouble Diagnosis of Each Part 8-4-1.Problems of Each Part and Inspection Points1 Outdoor control circuit board 8-4-2.Inspection Points for Each Part2 Fuse 3 Compressor6 Electric expansion valve 8 Breaker 7 Branch tubing temperature sensor9 Refrigerant gas pressure Diagnostic procedure 8-5.Trouble Diagnosis of Fan MotorDiagnostic results Remedy for symptom 3 to9-1.Characteristics of New Refrigerant R410A SPECIAL PRECAUTIONS WHEN SERVICING UNIT9-1-1.What is New Refrigerant R410A? 9-1-3.CharacteristicsTubing precautions 9-2.Checklist before ServicingSize of flare No addition of compressor oil for R410A9-3.Tools Specifically for R410A 9-4.Tubing Installation Procedures9-5.In Case of Compressor Malfunction 9-5-1.Procedure for Replacing CompressorPage 9-6.In Case Refrigerant is Leaking 9-7.Charging Additional Refrigerant 9-7-1.When Tubes are Extended9-8. Retro-FittingExisting Systems 9-8-1.Use of Existing UnitsCU-3KS19NBU CU-4KS24NBU CU-4KS31NBU APPENDIX A INSTALLATION INSTRUCTIONSFor Outdoor Unit ContentsIn Case of Improper Installation SPECIAL PRECAUTIONSWARNING When Wiring When TransportingOthers When Servicing‡RQRWLQVWDOORQO\DVLQJOHLQGRRUXQLW fins of the outdoor unit. You may get injured1. General 2. Installation Site Selection Limit of Max. Allowable TotalLimit of Elevation Required AmountIndoor unit Outdoor unitOutdoor unit 3/89.52mmIndoor unit Outdoor unitOutdoor unit Indoor unitIndoor unit Outdoor unitOutdoor unit Indoor unitIndoor unit Outdoor unit5/815.88mm CS-MKS24NKUAbout Air Discharge Baffle Air Intake BaffleDimensions Dimensions4 Precautions for installation 3 Installation procedure1. Air Intake Baffle 2. Air Discharge Baffle2-5.Outer Dimensions of Outdoor Unit unit: inch mmFig. 6a Fig. 6bIndoor unit D 2-6. Diagram of Outdoor Unit InstallationIndoor unit C Indoor unit B Indoor unit C Indoor unit B3-1. Embedding the Tubing and Wiring 3. Installation Process3-4.Caution before Connecting Tubes Tightly D C BFig. Fig.3-6.Insulation of Refrigerant Tubing Air Purging with a Vacuum Pump for Test Run 4. Air PurgingFig. adapter manual, and use the adapter correctlyTable gas without releasing it into the atmosphere Pump Down5-1.General Precautions on Wiring 5. Wiring Instructions5-2.Recommended Wire Length and Diameter Each wire must be firmly connected 5-4.How to Connect Wiring to the Terminal Fig. 5-5.Wiring Instructions for the Outdoor UnitChecking tubing and wiring 6. Test RunPerforming a test run Fig.8. Installation Check Sheet 7. Connecting a Home Automation DeviceDC1111-0

TECHNICAL & SERVICE MANUAL

OUTDOOR UNIT : CU-3KS19NBU

CU-4KS31NBU

DC INVERTER MULTI-SYSTEM AIR CONDITIONER

Capacity at 230V

Outdoor Model No.

Product Code No.

19,700 BTU/h

CU-3KS19NBU

1 852 361 24

25,400 BTU/h

CU-4KS24NBU

30,600 BTU/h

CU-4KS31NBU

CU-3KS19NBU

< Applicable Indoor Units >

Pay special attention when servicing the unit.