Panasonic KS12NB41A User Manual

TECHNICAL & SERVICE MANUALCS-KS12NB41 & CZ-18BT1U + CU-KS12NK1ACS-KS18NB4UW & CZ-18BT1U + CU-KS18NKUCS-KS18NB4UW & CZ-18BT1U + CU-KS18

Indoor Unit CS-KS18NB4UW & CZ-18BT1UOutdoor Unit CU-KS18NKUDATA SUBJECT TO CHANGE WITHOUT NOTICE.Remarks: Rating conditions are:Cooling: Indoor ai

Indoor Unit CS-KS12NB41 & CZ-18BT1UOutdoor Unit CU-KS12NK1A2-1-3.VerticaldB-AdB-AIndoor : Hi/Me/LoOutdoor : HiAir FilterCompressorRefrigerant / Am

Indoor Unit CS-KS12NB41 & CZ-18BT1UOutdoor Unit CU-KS12NK1ADATA SUBJECT TO CHANGE WITHOUT NOTICE.Remarks: Rating conditions are:Cooling: Indoor ai

< 230V >Indoor Unit CS-KS18NB4UW & CZ-18BT1UOutdoor Unit CU-KS18NKUA2-1-4.VerticaldB-AdB-AIndoor : Hi/Me/LoOutdoor : HiAir FilterCompressorR

Indoor Unit CS-KS18NB4UW & CZ-18BT1UOutdoor Unit CU-KS18NKUADATA SUBJECT TO CHANGE WITHOUT NOTICE.Remarks: Rating conditions are:Cooling: Indoor a

Indoor Unit CS-KS18NB4UW & CZ-18BT1UOutdoor Unit CU-KS18NKUA< 208V >2-1-5.VerticaldB-AdB-AIndoor : Hi/Me/LoOutdoor : HiAir FilterCompressorR

Indoor Unit CS-KS18NB4UW & CZ-18BT1UOutdoor Unit CU-KS18NKUADATA SUBJECT TO CHANGE WITHOUT NOTICE.Remarks: Rating conditions are:Cooling: Indoor a

Indoor Unit (Body) CS-KS12NB41Indoor Unit (Panel) CZ-18BT1U2-2. Major Component Specifications2-2-1. Indoor UnitMP24ZN-12V ... 2Flap MotorType Stepp

Indoor Unit (Body) CS-KS18NB4UWIndoor Unit (Panel) CZ-18BT1UMP24ZN-12V ... 2Flap MotorType Stepping MotorRating Model ... Q'tyCoil Resistance Ohm

Outdoor Unit CU-KS18NKUControl PCBControl Circuit Fuse ControlsPart No.Microprocessor250V 25ACB-CU-KS18NKUDATA SUBJECT TO CHANGE WITHOUT NOTICE.Pints

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

Outdoor Unit CU-KS12NK1AControl PCBControl Circuit Fuse ControlsPart No.Microprocessor125V 25ACB-CU-KS12NK1ADATA SUBJECT TO CHANGE WITHOUT NOTICE.Pint

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

2-3. Other Component Specifications Indoor Unit CS-KS12NB41 & CZ-18BT1U CS-KS18NB4UW & CZ-18BT1UOutdoor Unit CU-KS18NKU CU-KS12NK1A CU-

3. DIMENSIONAL DATAIndoor Unit CS-KS12NB41 & CZ-18BT1U CS-KS18NB4UW & CZ-18BT1U6-5/16 6-11/161-3/16 (30)4-19/321-25/321-25/322-3/328-15/32

10-13/163-19/32ID:23/322-ID:15/1621-3/166-3/324-9/32 2-5/32Narrow tube service valvedia.1/4" (6.35)Wide tube service valvedia.3/8" (9.52)3-1

Unit : inch (mm)(852-0-0010-13300-0)Narrow tube service valvedia.1/4" (6.35)Wide tube service valvedia.1/2" (12.70)4-3/8 2-5/326-17/325-23/3

Wide tubeNarrow tubeHeat exchangerIndoor unitStrainerO.D.3/8"(9.52 mm)O.D.1/4"(6.35 mm)4. REFRIGERANT FLOW DIAGRAM4-1. Refrigerant Flow Di

Wide tubeNarrow tubeIndoor unitO.D.1/2"(12.7mm)O.D.1/4"(6.35 mm)Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU CU-KS18NK

Hi FanLo FanCooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 115V)(1) Low pressure performance chart(2) Operating current perfor

• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.NOTECooling Characteristics (

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

5-2. Cooling CapacityIndoor Unit : CS-KS12NB41 & CZ-18BT1UOutdoor Unit : CU-KS12NK1APower Supply : 115V Single Phase 60Hz< Cooling Capaci

Indoor Unit : CS-KS18NB4UW & CZ-18BT1UOutdoor Unit : CU-KS18NKU or CU-KS18NKUAPower Supply : 230V Single Phase 60Hz< Cooling Capacity >

5-3. Cooling Capacity (Low Ambient)Indoor Unit : CS-KS12NB41 & CZ-18BT1UOutdoor Unit : CU-KS12NK1APower Supply : 115V Single Phase 60Hz<

Indoor Unit : CS-KS18NB4UW & CZ-18BT1UOutdoor Unit : CU-KS18NKUAPower Supply : 230V Single Phase 60Hz< Cooling Capacity (Low Ambient) >

6. ELECTRICAL DATA6-1. Electrical CharacteristicsIndoor Unit CS-KS12NB41 & CZ-18BT1UOutdoor Unit CU-KS12NK1AIndoor Unit Outdoor Unit Complete

Indoor Unit CS-KS18NB4UW & CZ-18BT1UOutdoor Unit CU-KS18NKUIndoor Unit Outdoor UnitFan Motor Fan Motor + CompressorPerformance at 230V Single-

6-2. Electric Wiring DiagramsIndoor Unit CS-KS12NB41 & CZ-18BT1U CS-KS18NB4UW & CZ-18BT1U8FA2-5250-46900-21 2 3 4 5 61 2 3 4 5 6FMDPFAN MOT

Outdoor Unit CU-KS12NK1A8FA2-5251-12300-237

Outdoor Unit CU-KS18NKU CU-KS18NKUA8FA2-5251-12000-225ACONTROLLERDCFM MV0FAN MOTOR12 3 4 5 6 7BLKWHTREDBLUYELBLKWHTREDBLUYELwwwwwwww1 2 3 4 551 2 4

ACL(Reset)button1HR.TIMERbuttonON/OFFoperationbuttonHIGH POWERbuttonTest run modeSelf-diagnostic modeAddress setting modeFig. 1Fig. 2Fig. 3Ta bACL but

Table of Contents SAFETY PRECAUTIONSTABLE OF CONTENTS1. OPERATING RANGE2. SPECIFICATIONS2-1. Unit Specifications 2-2. Major Component Specific

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

7-3. Disassembly Procedure7-3-1. Remove the air intake grill.(1) Slide the 2 latches each to the corresponding arrow direction. (Fig. 1 and Fig. 2)

NOTE7-3-3. Remove the ceiling panel.(1) Open the clamp (4 locations) and remove the 2 lead wires from the clamps. (Fig. 6)(2) Remove the 4 screws fixi

1237-3-4. Remove the indoor air temperature sensor.(1) Disconnect the connector CN08 (ROOM 2P) in the control box and remove the indoor air temperatu

12 3(4) Disconnect the connector CN07 (DP 2P) in the power box. (Fig. 13) Remove a screw and disconnect the ground cable. (Fig. 13)(5) Disconnect the

For the removal of the following components, perform any work after removing the indoor unit (main body) from the ceiling. Main body lower section

7-3-7. Remove the heat exchanger sensor.(1) Remove the heat exchanger sensor from the sensor holder. (Fig. 19) 7-3-8. Remove the drain pump and float

7-3-9. Remove the turbo fan and fan motor.(1) Remove a nut and remove the turbo fan. (Fig. 22)(2) Remove the 2 screws and 3 nuts, and remove the fan m

8. FUNCTIONS8-1. Operation FunctionsEmergency operation SENSOR DRY During DRY operation, the system adjusts the room temperature and fan speed acco

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

10. CHECKING ELECTRICAL COMPONENTS10-1. Measurement of Insulation Resistance10-2. Checking Continuity of Fuse on PCB Ass'y11. REFRIGERANT R410A

a. Area: Automatic capacity controlb. When the temperature drops below Point A, the operation frequency is reduced by a certain proportion.c. Area:

< Clock display >Test run modeSelf-diagnostics mode9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)9-1. Precautions before Performing Inspectio

Since the indications cover various units, the corresponding parts listed below may not be present in some models.(1) Self-diagnostics Lamps(1) DRA

(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

(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 t

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

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, an

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

95 °F DB / 71 °F WB67 °F DB / 57 °F WB1. OPERATING RANGEMaximumMinimum115 °F DB67 °F DBTemperature Indoor Air Intake Temp. Outdoor Air Intake Temp.Co

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

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

< 230V >Indoor Unit CS-KS18NB4UW & CZ-18BT1UOutdoor Unit CU-KS18NKU2-1-1.VerticaldB-AdB-AIndoor : Hi/Me/LoOutdoor : HiAir FilterCompressorRe

Indoor Unit CS-KS18NB4UW & CZ-18BT1UOutdoor Unit CU-KS18NKUDATA SUBJECT TO CHANGE WITHOUT NOTICE.Remarks: Rating conditions are:Cooling: Indoor ai

Indoor Unit CS-KS18NB4UW & CZ-18BT1UOutdoor Unit CU-KS18NKU< 208V >2-1-2.VerticaldB-AdB-AIndoor : Hi/Me/LoOutdoor : HiAir FilterCompressorRe