Panasonic CS-KS18NKU Service Manual

TECHNICAL & SERVICE MANUALCS-KS18NKU + CU-KS18NKU+ CU-KS18NKUACS-KS24NKU + CU-KS24NKU+ CU-KS24NKUADC INVERTER SPLIT SYSTEM AIR CONDITIONERIndoor U

Indoor Unit CS-KS24NKUOutdoor Unit CU-KS24NKU< 208V >DATA SUBJECT TO CHANGE WITHOUT NOTICE.VerticaldB-AdB-AIndoor : Hi/Me/Lo/Qt*Outdoor : HiAir

8(1) Recommended dimensions of the baffle platesDFECJHLIBKQRAGO(3- 6.5 mm)3- 1/4"(2- 6 mm)2- 15/64"ABHCEFKIJGGD(4- 6.5 mm)4- 1

9(3) Installation procedurePanel topPanel frontPanel side RPanel side LFig. 5j1. Air Intake Baffle(1) Left side1. Remove the top panel from the unit.2

10Set screw only for transportationFig. 6Rear panelmarksFig. 7LefttubingRight tubingDownward tubingRight-reartubing(recommended)Left-reartubingFig. 83

11IndoorsideOutdoorsideHole should be made at a slight downward slant to theoutdoor side.NOTEFig. 10Plastic coverINSIDE OUTSIDEWallSlightanglePVC pipe

123-4. Remove the Grille to Install the Indoor UnitBasically, these models can be installed and wired with-out removing the grille. If access to any

133-5. Shape the Indoor Side Tubing(1) Arrangement of tubing by directiona) Right or left tubingCut out the corner of the right/left frame with ahack

14(A)+(B) (A) Power Supply Wiring Length (ft) (C) ControlFuse or Circuit AWG(B) Power Line Length (ft) Line Length (ft)Model (#14) (#12) (#14)Breaker

153-8. Wiring Instructions for Inter-unit Connections(1) Insert the inter-unit wiring (according to local codes)into the through-the-wall PVC pipe. R

16When connecting each power wire to the correspondingterminal, follow the instructions “How to connect wiringto the terminal” and fasten the wire sec

173-9. Mounting(1) To install the indoor unit, mount the indoor unit ontothe 2 tabs on the upper part of the rear plate. (2) Hold down the air discha

Indoor Unit CS-KS18NKUOutdoor Unit CU-KS18NKUA< 230V >DATA SUBJECT TO CHANGE WITHOUT NOTICE.VerticaldB-AdB-AIndoor : Hi/Me/Lo/Qt*Outdoor : HiAir

18Hole in wallBent partNarrow tubeWide tubeRear panelFig. 38Drain capDrain hoseFig. 39 Left-side tubing(1) Lead the tubing and drain hose through the

19To unmount indoor unitPress the 2 marks on the lower part of the indoor unitand unlatch the tabs. Then lift the indoor unit andunmount. (Fig. 42)3-

204. How to Install the Outdoor UnitFirst refer to Section 2. Installation Site Selection.4-1. Wiring Instructions for the Outdoor UnitRegulations o

215. Refrigerant Tubing5-1. Use of the Flaring MethodMany of the conventional split system air conditionersemploy the flaring method to connect refr

225-4. Connecting Tubing between Indoor and Outdoor Unitsa) Tightly connect the indoor side refrigerant tubing exten-ded from the wall with the outdoo

236. Air PurgingAir and moisture remaining in the refrigerant systemhave undesirable effects as indicated below. Therefore,they must be purged comple

24(5) With the vacuum pump still running, close the “Lo”knob of the manifold valve. Then stop the vacuumpump.(6) With the hex wrench, turn the valve s

25How to Test Run the Air ConditionerAfter turning on the power of the air conditioner, use theremote controller and follow the steps below to conduct

26 Pump DownPump down means collecting all refrigerant gas in thesystem back into the outdoor unit without losing any ofthe gas. Pump down is used wh

277. Remote Controller Installation PositionThe remote controller can be operated from either anon-fixed position or a wall-mounted position.To ensur

Indoor Unit CS-KS18NKUOutdoor Unit CU-KS18NKUA< 208V >DATA SUBJECT TO CHANGE WITHOUT NOTICE.VerticaldB-AdB-AIndoor : Hi/Me/Lo/Qt*Outdoor : HiAir

288. Address Switch8-1. Address Setting of the Remote ControllerThe address can be set in order to prevent interferencebetween remote controllers wh

DC1111-0

Indoor Unit CS-KS24NKUOutdoor Unit CU-KS24NKUA< 230V >DATA SUBJECT TO CHANGE WITHOUT NOTICE.VerticaldB-AdB-AIndoor : Hi/Me/Lo/Qt*Outdoor : HiAir

Indoor Unit CS-KS24NKUOutdoor Unit CU-KS24NKUA< 208V >DATA SUBJECT TO CHANGE WITHOUT NOTICE.VerticaldB-AdB-AIndoor : Hi/Me/Lo/Qt*Outdoor : HiAir

Indoor Unit CS-KS18NKUMP24Z3Flap MotorType Stepping MotorRating ModelCoil Resistance Ohm(Ambient Temp. 77 °F (25 °C))Each Pair of Terminal : 400 +/- 7

Indoor Unit CS-KS24NKUMP24Z3Flap MotorType Stepping MotorRating ModelCoil Resistance Ohm(Ambient Temp. 77 °F (25 °C))Each Pair of Terminal : 400 +/- 7

Outdoor Unit CU-KS18NKU2-2-2. Outdoor UnitControl PCBControl Circuit Fuse ControlsPart No.Microprocessor250V 25ACB-CU-KS18NKUDATA SUBJECT TO CHANGE W

Outdoor Unit CU-KS24NKUControl PCBControl Circuit Fuse ControlsPart No.Microprocessor250V 25ACB-CU-KS24NKUDATA SUBJECT TO CHANGE WITHOUT NOTICE.Pints

Outdoor Unit CU-KS18NKUAControl PCBControl Circuit Fuse ControlsPart No.Microprocessor250V 25ACB-CU-KS18NKUADATA SUBJECT TO CHANGE WITHOUT NOTICE.Pint

• Before doing repair work, please read the " SAFETY PRECAUTIONS" carefully and fully understand them. • The precautionary items here ar

Outdoor Unit CU-KS24NKUAControl PCBControl Circuit Fuse ControlsPart No.Microprocessor250V 25ACB-CU-KS24NKUADATA SUBJECT TO CHANGE WITHOUT NOTICE.Pint

2-3. Other Component Specifications Indoor Unit CS-KS18NKUCS-KS24NKUOutdoor Unit CU-KS18NKU CU-KS24NKUCU-KS18NKUA CU-KS24NKUA032 50 68 86 104 122 140

3. DIMENSIONAL DATAIndoor Unit CS-KS18NKUCS-KS24NKUCS-KS18NKUCS-KS24NKUUnit: inch(mm)(852-0-0010-216-00-0)22

Unit: inch(mm)Narrow tube service valvedia.1/4" (6.35)Wide tube service valvedia.1/2" (12.70)4-3/82-5/326-17/325-23/323/3226-3/8 (670)23/321

Wide tube service valvedia.5/8" (15.88)Narrow tube service valvedia.1/4" (6.35)4-7/165-29/322-1/32 4-1/229-1/8 (740)23/321-21/3235-7/16(900)

CompressorAccumulatorWide tubeservicevalveWide tubeNarrowtubeservicevalveNarrow tubeHeat exchangerHeat exchangerMufflerCooling cycleIndoor unit Outdoo

5. PERFORMANCE DATA5-1. Temperature ChartsIndoor Unit CS-KS18NKUOutdoor Unit CU-KS18NKU• Check each performance value in test-run mode. Electrical p

Indoor Unit CS-KS18NKUOutdoor Unit CU-KS18NKUA• Check each performance value in test-run mode. Electrical performance values represent a combined indo

Indoor Unit CS-KS24NKUOutdoor Unit CU-KS24NKUCooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)(1) Low pressure performance

Indoor Unit CS-KS24NKUOutdoor Unit CU-KS24NKUACooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)(1) Low pressure performan

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

Indoor Unit : CS-KS18NKUOutdoor Unit : CU-KS18NKU / CU-KS18NKUAPower Supply : 230V Single Phase 60Hz< Cooling Capacity >5-2. Cooling CapacityTC

Indoor Unit : CS-KS24NKUOutdoor Unit : CU-KS24NKU / CU-KS24NKUAPower Supply : 230V Single Phase 60Hz< Cooling Capacity >TC : Total Cooling Capac

Indoor Unit : CS-KS18NKUOutdoor Unit : CU-KS18NKUAPower Supply : 230V Single Phase 60Hz< Cooling Capacity (Low Ambient) >5-3. Cooling Capacity

Indoor Unit : CS-KS24NKUOutdoor Unit : CU-KS24NKUAPower Supply : 230V Single Phase 60Hz< Cooling Capacity (Low Ambient) >TC : Total Cooling Capa

Horizontal distance (ft.)Axis air velocity (ft./sec.)Vertical distance (ft.)Room air temp. : 80°F (26.7°C)Fan speed : HighCooling : Flap angle 0 , :

Horizontal distance (ft.)Axis air velocity (ft./sec.)Vertical distance (ft.)Room air temp. : 80°F (26.7°C)Fan speed : HighCooling : Flap angle 0 , :

6. ELECTRICAL DATA6-1. Electrical CharacteristicsIndoor Unit CS-KS18NKUOutdoor Unit CU-KS18NKUIndoor Unit Outdoor UnitFan Motor Fan Motor + Compress

Indoor Unit CS-KS24NKUOutdoor Unit CU-KS24NKUIndoor Unit Outdoor UnitFan Motor Fan Motor + CompressorPerformance at 230V Single-phase 60HzRating condi

8FA2-5251-11000-26-2. Electric Wiring DiagramsIndoor Unit CS-KS18NKU CS-KS24NKUWARNINGTo avoid electrical shock hazard, be sure todisconnect power be

8FA2-5251-12000-2Outdoor Unit CU-KS18NKU CU-KS18NKUAWARNINGTo avoid electrical shock hazard, be sure todisconnect power before checking, servicingand/

Table of Contents1. OPERATING RANGE2. SPECIFICATIONS2-1. Unit Specifications 2-2. Major Component Specifications 2-3. Other Component Specificatio

8FA2-5251-12800-2Outdoor Unit CU-KS24NKUWARNINGTo avoid electrical shock hazard, be sure todisconnect power before checking, servicingand/or cleaning

8FA2-5251-12700-2Outdoor Unit CU-KS24NKUAWARNINGTo avoid electrical shock hazard, be sure todisconnect power before checking, servicingand/or cleaning

1HR.TIMERbuttonON/OFFoperationbutton ACL(Reset)buttonQUIETbutton7. MAINTENANCE7-1. Address Setting of the Remote Control UnitThe address can be set

One of the two types of connectors illustrated at left is used. Theirbasic structure is the same for each. How to DisconnectHold the resin connector c

Emergency operation SENSOR DRYDuring DRY operation, the system adjusts the room temperature and fan speed according to the conditions in the room, in

HIGH POWERNIGHT SETBACKLamp colorsTimer backupThis function acts to raise the power but keeps the AC system in the same operating mode.This function i

Compressor discharge temperature controlFreeze preventionDuring COOL or DRY operation, freezing is detected and operation is stopped when the temperat

1HR.TIMERbuttonON/OFFoperationbutton ACL(Reset)buttonQUIETbutton< Clock display >Test run modeSelf-diagnostics mode9. TROUBLESHOOTING (BEFORE C

Since the indications cover various units, the corresponding parts listed below may not be present in some models.REMOTE CONTROL receiver(1) OPERAT

(2) If the self-diagnostics function fails to operateCheck the indoor unit.Is the fuse blown?Replace the controller.Replace the circuitboard or the fu

11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT11-1. Characteristics of New Refrigerant R410A11-2. Checklist before Servicing11-3. Tool

9-3. Checking the Indoor and Outdoor Units(1) Checking the indoor unit(2) Checking the outdoor unit Using the TEST/T-RUN terminalsControlNo. Check ite

(3) Serial Communication Error Identification ProcedureRefer to "Method of Self-Diagnostics" for the self-diagnostics procedure.(3-1) Condit

What is the latest self-diagnosis result ?Condition: E12Defect in the outdoor unitP.C. board.Condition: E01Defect or connection errorin the inter-unit

(3-2) Condition: E12Troubleshooting Serial Communication1. Turn off the power and wait until the power lamp (LED)of the outdoor unit controller is tur

[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the indoor unit operates.(There is trouble in the syst

9-4-2. Outdoor Fan MotorThis outdoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil resistance, and

9-5. Noise Malfunction and Electromagnetic InterferenceAn inverter A/C operates using pulse signal control and high frequencies. Therefore, it is sus

Insulation testerProbeClipGround wireTerminal plateCoppertube ormetallic partClipInsulation testerProbeFig. 1Fig. 2Fig. 3Fig. 4Coppertube ormetallic p

FusePCB Ass'yFig. 5Fig. 6Fuse10-2. Checking Continuity of Fuse on PCB Ass'yRemove the PCB Ass'y from the electrical component box. The

11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT11-1. Characteristics of New Refrigerant R410A11-1-1. What is New Refrigerant R410A?R

95 °F DB / 71 °F WB 67 °F DB / 57 °F WB 1. OPERATING RANGEMaximumMinimum115 °F DB67 °F DBTemperature Indoor Air Intake Temp. Outdoor Air Intake Te

Tubing precautionsRefrigerant R410A is more easily affected by dust or moisture compared with R22, thus be sure to temporarily cover the ends of the t

11-3. Tools Specifically for R410A For servicing, use the following tools for R410AGauge manifoldCharging hoseGas leak detectorRefrigerant cylinderCh

11-5. In Case of Compressor Malfunction CAUTIONShould the compressor malfunction, be sure to make the switch to a replacement compressor as quickly a

ValveSingle valveCharge liquid refrigerant with cylinder in up-side-down position.Single valve (with siphon tube)Charge with cylinder in normal positi

Length of tubingEvacuation timeLess than 33 ft. (10 m)More than 10 minutesMore than 33 ft. (10 m)More than 15 minutes11-6. In Case Refrigerant is Le

11-7. Charging Additional Refrigerant11-7-1. When Tubes are ExtendedObserve the proper amount of refrigerant as stated in this service manual or the

Operating InstructionsCS-KS18NKU + CU-KS18NKU+ CU-KS18NKUACS-KS24NKU + CU-KS24NKU+ CU-KS24NKUA(852-6-4181-210-00-1)APPENDIX AA-1

This air conditioner uses the refrigerant R410A.Split System Air ConditionerModel No.Panasonic Corporation1006 Kadoma, Kadoma City, Osaka, Japan852641

2FEATURESThis air conditioner is an inverter type unit that automatically adjusts capability as appropriate. Details on these functionsare provided be

3INSTALLATION LOCATION• We recommend that this air conditioner be installed properly by qualified installation technicians in accordance with the Inst

2. SPECIFICATIONS2-1. Unit SpecificationsIndoor Unit CS-KS18NKUOutdoor Unit CU-KS18NKU< 230V >DATA SUBJECT TO CHANGE WITHOUT NOTICE.Remarks: R

4• To prevent possible hazards from insulation failure, the unit must be grounded.• Do not clean inside the indoor and outdoor units by users. Engage

5NAMES OF PARTSThis illustration is based on the external view of a standard model.Consequently, the shape may differ from that of the air conditioner

6UNIT DISPLAY AND OPERATION BUTTONREMOTE CONTROL receiver This section picks up infrared signals from the remote controller (transmitter).OPERATION bu

7REMOTE CONTROLLER (DISPLAY)(1) Operation modeMILD DRY ...COOL ...FAN ...

8REMOTE CONTROLLERThe illustration above pictures the remote controller after the cover has been opened.Transmitter When you press the buttons on the

9REMOTE CONTROLLER (CONTINUED)Temperature setting buttons(TEMP.)Press the button to increase the set temperature.Press the button to reduce the se

10REMOTE CONTROLLER (CONTINUED)USING THE REMOTE CONTROLLERTemperature Display Selector buttonThis switches the temperature display between °C and °F.T

11USING THE REMOTE CONTROLLER (CONTINUED)How to Use the RemoteControllerWhen using the remote controller, always point the unit’s transmitter head dir

12OPERATION WITH THE REMOTE CONTROLLER1. OperationCheck that the circuit breaker on the power panel is turned on.Press the setting buttons as describ

13OPERATION WITH THE REMOTE CONTROLLER (CONTINUED)• Choose the best position in the room for the remote controller, which also acts as the sensor for

Indoor Unit CS-KS18NKUOutdoor Unit CU-KS18NKU< 208V >DATA SUBJECT TO CHANGE WITHOUT NOTICE.VerticaldB-AdB-AIndoor : Hi/Me/Lo/Qt*Outdoor : HiAir

14OPERATION WITH THE REMOTE CONTROLLER (CONTINUED)4. Night Setback ModeNight Setback Mode is used for saving energy.Press the NIGHT SETBACK button wh

15OPERATION WITH THE REMOTE CONTROLLER (CONTINUED) 5. QUIET ModeQUIET Mode is used to reduce the fan sound of the indoor unit. Press the QUIE

16SPECIAL REMARKSHow it works? • Once the room temperature reaches the level that was set, the unit’s operation frequency is changed automatically.• D

17SETTING THE TIMERIn the descriptions below, the following settings are used for the temperature and time indicator selector button on the bottom fro

18SETTING THE TIMER (CONTINUED)3. How to set the ON time(Example) To start operation at 7:10 am.4. How to set DAILY ON/OFF REPEAT timer(Example) To st

19USING THE 1-HOUR OFF TIMERTIPS FOR ENERGY SAVING1. 1-Hour OFF Timer This function causes the unit to operate for one hour and then stop, regardless

20ADJUSTING THE AIRFLOW DIRECTION1. Horizontal The horizontal airflow can be adjusted by moving the vertical vanes with your hands to the left or righ

21OPERATION WITHOUT THE REMOTE CONTROLLERCARE AND CLEANINGINDOOR UNIT If you have lost the remote controller or it has trouble, follow the steps below

22CARE AND CLEANING (CONTINUED)Filter The filter behind the air intake grille should be checked and cleaned at least once every two weeks.How to remov

23CARE AND CLEANING (CONTINUED)WIRED REMOTE CONTROLLERCleaning the main unit andRemote Controller• Wipe clean using a soft, dry cloth.• To remove stub

Indoor Unit CS-KS24NKUOutdoor Unit CU-KS24NKU< 230V >DATA SUBJECT TO CHANGE WITHOUT NOTICE.VerticaldB-AdB-AIndoor : Hi/Me/Lo/Qt*Outdoor : HiAir

24TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)If your air conditioner does not work properly, first check the following points before requesting servi

25SPECIFICATIONSModel No.Heating CapacityOperationSoundUnit Dimensions (H×W×D)(Indoor unit : Include panel)Net WeightPower SourceCooling CapacitykWBTU

INSTALLATION INSTRCTIONSCS-KS18NKU + CU-KS18NKU+ CU-KS18NKUACS-KS24NKU + CU-KS24NKU+ CU-KS24NKUA(852-6-4190-576-00-0)APPENDIX BA-2

This air conditioner uses the refrigerant R410A.External diameter of service port R410A: 5/16"Split System Air Conditioner85264190576000 2011INST

2IMPORTANT! Please Read Before StartingThis air conditioning system meets strict safety and operatingstandards. As the installer or service person, it

3 8VHWKHIODUHPHWKRGIRUFRQQHFWLQJWXELQJ $SSO\UHIULJHUDQWOXEULFDQWWRWKHPDWFKLQJVXUIDFHVRIthe flare and union tubes before connecting the

41. GeneralThis booklet briefly outlines where and how to install theair conditioning system. Please read over the entire setof instructions for the

51-5. Additional Materials Required for Installation1. Refrigeration (armored) tape2. Insulated staples or clamps for connecting wire(See local codes

62-2. Outdoor UnitAVOID: heat sources, exhaust fans, etc. (Fig. 4) damp, humid or uneven locations.DO: choose a place as cool as possible. choose

72-3. Baffle Plate for the Outdoor Unit(CU-KSxxNKUA models only)It is recommended to use baffle plates for models CU-KS18NKUA and CU-KS24NKUA. The ba