Panasonic CS-KE12NB41 Technical & Service Manual
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Panasonic CS-KE12NB41 Technical & Service Manual

Dc inverter split system air conditioner
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TECHNICAL & SERVICE MANUAL
CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1
CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU
DC INVERTER SPLIT SYSTEM AIR CONDITIONER
Indoor Model No.
Body (Panel)
CS-KE12NB41 (CZ-18BT1U)
CS-KE18NB4UW (CZ-18BT1U)
Indoor Unit
CS-KE12NB41 (Body) & CZ-18BT1U (Panel)
CS-KE18NB4UW (Body) & CZ-18BT1U (Panel)
Remote Controller
Wired Remote Controller
(Option)
Product Code No.
Body (Panel)
1 852 361 05 (1 852 361 15)
1 852 361 07 (1 852 361 15)
Body
Panel
Outdoor Model No. Product Code No.
CU-KE12NK1
1 852 361 17
CU-KE18NKU
1 852 361 20
Outdoor Unit
CU-KE12NK1
CU-KE18NKU
REFERENCE NO.
SM
700880

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  • Page 1 TECHNICAL & SERVICE MANUAL CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU DC INVERTER SPLIT SYSTEM AIR CONDITIONER Indoor Model No. Product Code No. Outdoor Model No. Product Code No. Body (Panel) Body (Panel) CU-KE12NK1 1 852 361 17...

  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS • Before doing repair work, please read the " SAFETY PRECAUTIONS" carefully and fully understand them. • The precautionary items here are divided into " Warning" and " Caution" items. Items in particular which may cause death or serious injury to the service personnel if the work is not performed correctly, are included in the "...
  • Page 3 Warning If refrigerant gas blows off during the work, do not touch the refrigerant gas as it may cause frostbite. Prohibit If refrigerant gas leaks during the work, ventilate the room. If refrigerant gas catches fire, harmful gas may be generated. Do not mix any gas other than the specified refrigerant gas in the refrigerating cycle.

  • Page 4: Table Of Contents

    Table of Contents Page SAFETY PRECAUTIONS ......................TABLE OF CONTENTS ........................1. OPERATING RANGE ........................2. SPECIFICATIONS 2-1. Unit Specifications ......................2-2. Major Component Specifications ..................2-3. Other Component Specifications ..................3. DIMENSIONAL DATA ........................4. REFRIGERANT FLOW DIAGRAM 4-1. Refrigerant Flow Diagram ....................
  • Page 5 ..................11-8. Retro-Fitting Existing Systems .................... APPENDIX A Operating Instructions .................... (CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU) APPENDIX B INSTALLATION INSTRUCTIONS ................(CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU) APPENDIX C Operating Instructions ....................

  • Page 6: Operating Range

    1. OPERATING RANGE Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp. Maximum 95 °F DB / 71 °F WB 115 °F DB Cooling Minimum 67 °F DB / 57 °F WB 0 °F DB Maximum 80 °F DB / 67 °F WB 75 °F DB / 65 °F WB Heating Minimum...

  • Page 7: Specifications

    2. SPECIFICATIONS 2-1. Unit Specifications 2-1-1. Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1 Voltage Rating 115V Single-Phase 60Hz Cooling Heating Total Capacity BTU/h 11,900 ( 3,000 to 11,900 ) 13,600 ( 3,000 to 13,600 ) ( 0.9 to 3.5 ) ( 0.9 to 4.0 )
  • Page 8 Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1 Individual Unit Indoor Unit Dimensions & Weight (Indoor Unit) Body Panel (CS-KE12NB41 & CZ-18BT1U) (CS-KE12NB41) (CZ-18BT1U) Unit Dimensions Height inch (mm) 12-5/16 (313) 11-5/32 (283) 1-9/16 (40) Width inch (mm) 24-19/32 (625)
  • Page 9 2-1-2. Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU < 230V > Voltage Rating 230V Single-Phase 60Hz Cooling Heating Total Capacity BTU/h 17,500 ( 4,000 to 17,500 ) 20,400 ( 4,400 to 20,400 ) 5.15 ( 1.2 to 5.15 ) ( 1.3 to 6.0 ) Sensible Capacity 10,600...
  • Page 10 Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU < 230V > Individual Unit Indoor Unit Dimensions & Weight (Indoor Unit) Body Panel (CS-KE18NB4UW & CZ-18BT1U) (CS-KE18NB4UW) (CZ-18BT1U) Unit Dimensions Height inch (mm) 12-5/16 (313) 11-5/32 (283) 1-9/16 (40) Width inch (mm) 24-19/32 (625) 22-5/8 (575)
  • Page 11 2-1-3. Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU < 208V > Voltage Rating 208V Single-Phase 60Hz Cooling Heating Total Capacity BTU/h 17,500 ( 4,000 to 17,500 ) 20,400 ( 4,400 to 20,400 ) 5.15 ( 1.2 to 5.15 ) ( 1.3 to 6.0 ) Sensible Capacity 10,600...
  • Page 12 Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU < 208V > Individual Unit Indoor Unit Dimensions & Weight (Indoor Unit) Body Panel (CZ-KE18NB4UW & CZ-18BT1U) (CS-KE18NB4UW) (CZ-18BT1U) Unit Dimensions Height inch (mm) 12-5/16 (313) 11-5/32 (283) 1-9/16 (40) Width inch (mm) 24-19/32 (625) 22-5/8 (575)

  • Page 13: Major Component Specifications

    2-2. Major Component Specifications 2-2-1. Indoor Unit Indoor Unit (Body) CS-KE12NB41 Control PCB Part No. CB-CS-KE12NB4U Controls Microprocessor Control Circuit Fuse 250V 3A Type Turbo Q'ty ... Dia. and Length inch (mm) 1 ... D12-5/8 / L5-3/4 (D322/L147) Fan Motor...
  • Page 14 Indoor Unit (Body) CS-KE18NB4UW Control PCB Part No. CB-CS-KE18NB4U Controls Microprocessor Control Circuit Fuse 250V 3A Type Turbo Q'ty ... Dia. and Length inch (mm) 1 ... D12-5/8 / L5-3/4 (D322/L147) Fan Motor Type DC Motor Model ... Q'ty SIC-62FV-D866-2 ... 1 No.

  • Page 15: Outdoor Unit

    2-2-2. Outdoor Unit Outdoor Unit CU-KE12NK1 Control PCB Part No. CB-CU-KE12NK1 Controls Microprocessor Control Circuit Fuse 125V 25A Compressor Type DC Rotary (Hermetic) Compressor Model / Nominal Output G4C090LU1ER / 900W Compressor Oil ... Amount Pints (cc) FV50S ... 0.68 (320) Coil Resistance (Ambient Temp.
  • Page 16 Outdoor Unit CU-KE18NKU Control PCB Part No. CB-CU-KE18NKU Controls Microprocessor Control Circuit Fuse 250V 25A Compressor Type DC Twin Rotary (Hermetic) Compressor Model / Nominal Output C-6RVN93H0M / 1,050W Compressor Oil ... Amount Pints (cc) FV50S ... 0.74 (350) Coil Resistance (Ambient Temp. 68 °F (20 °C)) R - S : 0.482 S - T :...

  • Page 17: Other Component Specifications

    2-3. Other Component Specifications Indoor Unit CS-KE12NB41 & CZ-18BT1U CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE12NK1 CU-KE18NKU • Indoor heat exchanger sensor (Model:PT2M-51H-S3) • Compressor temp sensor (CU-KE12NK1 ... Model:DTN-TKS274Y TH2) • Indoor air temp sensor (CU-KE18NKU ... Model:DTN-TKS293B) (Model:KTEC-35-S98) 32 50 68 86 104 122 140 158 176 194...

  • Page 18: Dimensional Data

    3. DIMENSIONAL DATA Indoor Unit CS-KE12NB41 & CZ-18BT1U CS-KE18NB4UW & CZ-18BT1U 1-3/16 7-11/16 21/32 3-1/8 dimensions opening Ceiling (600) 23-5/8 pitch bolt Suspension (283) 11-5/32 (30) 1-3/16 (625) 24-19/32 (534) 21-1/32 12-7/16 8-15/32 (334) 13-5/32 1-25/32 12-7/8 1-25/32 4-19/32 5-9/16...
  • Page 19 Outdoor Unit CU-KE12NK1 21-3/16 3-19/32 15/32 10-13/16 Wide tube service valve dia.3/8" (9.52) 28-11/32 (720) 2-1/8 Narrow tube service valve dia.1/4" (6.35) 6-3/32 Unit : inch (mm) (852-0-0010-12700-0)
  • Page 20 Outdoor Unit CU-KE18NKU 23-15/16 5-11/32 15/32 11-17/32 Wide tube service valve dia.1/2" (12.70) 34-21/32(880) 2-17/32 Narrow tube service valve dia.1/4" (6.35) 3/32 1-13/16 5-23/32 2-13/32 Unit : inch (mm) (852-0-0010-13200-0)

  • Page 21: Refrigerant Flow Diagram

    4. REFRIGERANT FLOW DIAGRAM 4-1. Refrigerant Flow Diagram Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1 Indoor unit Outdoor unit Accumulator Wide tube service Wide tube valve High pressure switch Muffler O.D. H.P. 3/8" (9.52 mm) 4-way valve Capillary tube for...
  • Page 22 Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU Indoor unit Outdoor unit Accumulator Wide tube service Wide tube valve High pressure switch Muffler O.D. H.P. 1/2" (12.7mm) 4-way valve Capillary tube for Electric split flow Narrow expansion tube valve service Narrow tube valve Cooling cycle...

  • Page 23: Performance Data

    5. PERFORMANCE DATA 5-1. Temperature Charts Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1 Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 115V) (1) Low pressure performance chart Lo Fan Hi Fan (0.9) (0.7) (0.5) (25)
  • Page 24 Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1 Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (60Hz, 115V) (1) High pressure performance chart (3.5) (3.0) (2.5) (2.0) (1.5) (-5) (10) (15) (20) (25) Outdoor inlet air DB temp. °F(°C)
  • Page 25 Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V) (1) Low pressure performance chart Lo Fan Hi Fan (0.9) (0.7) (0.5) (25) (30) (35) (40) Outdoor inlet air DB temp. °F(°C) (2) Operating current performance chart Lo Fan Hi Fan...
  • Page 26 Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (60Hz, 230V) (1) High pressure performance chart (3.5) (3.0) (2.5) (2.0) (1.5) (-5) (10) (15) (20) (25) Outdoor inlet air DB temp. °F(°C) (2) Operating current performance chart (-5) (10)

  • Page 27: Cooling Capacity

    5-2. Cooling Capacity Indoor Unit : CS-KE12NB41 & CZ-18BT1U Outdoor Unit : CU-KE12NK1 Power Supply : 115V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 11,900 BTU/h AIR FLOW RATE: 235 CFM INDOOR OUTDOOR ENT. TEMP. AMBIENT TEMP. (18.3) (23.9)
  • Page 28 Indoor Unit : CS-KE18NB4UW & CZ-18BT1U Outdoor Unit : CU-KE18NKU Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 17,500 BTU/h AIR FLOW RATE: 341 CFM INDOOR OUTDOOR ENT. TEMP. AMBIENT TEMP. (18.3) (23.9) (29.4) (35.0) (40.6) (46.1) 12,260...

  • Page 29: Cooling Capacity (Low Ambient)

    5-3. Cooling Capacity (Low Ambient) Indoor Unit : CS-KE12NB41 & CZ-18BT1U Outdoor Unit : CU-KE12NK1 Power Supply : 115V Single Phase 60Hz < Cooling Capacity (Low Ambient) > RATING CAPACITY: 11,900 BTU/h AIR FLOW RATE: 235 CFM INDOOR OUTDOOR ENT. TEMP.
  • Page 30 Indoor Unit : CS-KE18NB4UW & CZ-18BT1U Outdoor Unit : CU-KE18NKU Power Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > RATING CAPACITY: 17,500 BTU/h AIR FLOW RATE: 341 CFM INDOOR OUTDOOR ENT. TEMP. AMBIENT TEMP. (-17.8) (-15.0) (-9.4) (-3.9) (1.7)

  • Page 31: Heating Capacity

    5-4. Heating Capacity Indoor Unit : CS-KE12NB41 & CZ-18BT1U Outdoor Unit : CU-KE12NK1 Power Supply : 115V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 13,600 BTU/h AIR FLOW RATE: 268 CFM OUTDOOR INDOOR ENT. TEMP. AMBIENT TEMP. (15.6) (18.3)
  • Page 32 Indoor Unit : CS-KE18NB4UW & CZ-18BT1U Outdoor Unit : CU-KE18NKU Power Supply : 230V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 20,400 BTU/h AIR FLOW RATE: 383 CFM OUTDOOR INDOOR ENT. TEMP. AMBIENT TEMP. (15.6) (18.3) (21.1) (23.9) (26.7) 0 (-17.8) 11,350...

  • Page 33: Electrical Data

    6. ELECTRICAL DATA 6-1. Electrical Characteristics Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1 Cooling Indoor Unit Outdoor Unit Complete Unit Fan Motor Fan Motor + Compressor Performance at 115V Single-phase 60Hz Rating conditions Running amp. 0.21 12.39 12.6 Power input...
  • Page 34 Indoor Unit CZ-KE18NB4U & CZ-18BT1U Outdoor Unit CU-KE18NKU (1) Voltage:230V < > Cooling 230V Indoor Unit Outdoor Unit Complete Unit Fan Motor Fan Motor + Compressor Performance at 230V Single-phase 60Hz Rating conditions Running amp. 0.15 8.15 Power input 1,838 1,860 Rating conditions: Indoor air temperature:...

  • Page 35: Electric Wiring Diagrams

    6-2. Electric Wiring Diagrams Indoor Unit CS-KE12NB41 & CZ-18BT1U CS-KE18NB4UW & CZ-18BT1U COIL-1 ROOM SWITCH FLOAT GRN/YEL YEL/(RED) YEL/(RED) CORE FERRITE...
  • Page 36 Outdoor Unit CU-KE12NK1 8FA2-5251-12200-2...
  • Page 37 Outdoor Unit CU-KE18NKU REACTANCE POWER RELAY TERMINAL PLATE FERRITE CORE ACIN1 CONTROLLER ACIN2 SI-A RV0 RV1 COMP A-TH COIL/OUTDOOR DCFM 1 2 3 4 1 2 3 4 1 2 3 4 5 6 7 1 2 3 4 5 POWER 1 2 3 4 5 6 7 SUPPLY...

  • Page 38: Maintenance

    7. MAINTENANCE T ab 7-1. Address Setting of the Remote Controller The address can be set in order to prevent interference between remote controllers when two indoor units are installed near each other. The address is normally set to "A." To set a different address, it is necessary to change the address on the Fig.

  • Page 39: Disconnecting And Connecting Positive Connector For Outdoor Unit

    7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit One of the two types of connectors illustrated at left is used. Their basic structure is the same for each. How to Disconnect Hold the resin connector cover, and pull the connector off. You cannot disconnect the connector by pulling the wire since it is locked inside.

  • Page 40: Disassembly Procedure

    7-3. Disassembly Procedure To avoid electrical shock hazard, be sure to disconnect power before WARNING attempting to disassemble the unit. When a footstool, etc. is used for disassembling the indoor unit, be careful not to fall down. If you fall down, you might be injured seriously. 7-3-1.
  • Page 41 7-3-3. 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 fixing the corner cover (at 3 locations) and indicator cover (at 1 location). (Fig. 6) (3) Press the center 1 of the cover and remove the cover with the section 2 pulled down.
  • Page 42 7-3-4. Remove the indoor air temperature sensor. (1) Disconnect the connector CN08 (ROOM 2P) in the control box and remove the indoor air temperature sensor. (Fig. 10) Indoor air temperature sensor CN08 Fig.10 7-3-5. Remove the power box and control box. (1) Remove a screw and remove the terminal cover.
  • Page 43 (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 connector CN03 (DCM 6P) in the power box. (Fig. 14) (6) Remove the 4 screws and remove the power box. (Fig. 14) (7) Disconnect the connectors CN06 (FS 3P) and CN09 (COIL-1 2P) in the control box.
  • Page 44 For the removal of the following components, perform any work after removing the indoor NOTE unit (main body) from the ceiling. Main body lower section Heat exchanger sensor Drain pump Float switch Turbo fan Fan motor Heat exchanger 1. Perform the work after draining the water to prevent the water leakage from the drain pan. Put a bucket, etc., under the drain cap and remove the drain cap to drain the water.
  • Page 45 7-3-7. Remove the heat exchanger sensor. (1) Remove the heat exchanger sensor from the sensor holder. (Fig. 19) Heat exchanger sensor Holder Fig.19 7-3-8. Remove the drain pump and float switch. (1) Remove the 2 screws (Fig. 20) (2) Loosen the clamp and disconnect the drain hose from the drain pump. (Fig. 20) (3) Remove the drain pump from the main body upper section.
  • Page 46 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 motor. (Fig. 23) Turbo fan Screw Fan motor Fig.22 Fig.23 7-3-10.

  • Page 47: Functions

    8. FUNCTIONS 8-1. Operation Functions Emergency operation SENSOR DRY Emergency operation is available when the remote During DRY operation, the system adjusts the room controller malfunctions, has been lost, or otherwise temperature and fan speed according to the conditions in the room, in order to maintain a comfortable room environment.

  • Page 48: Night Setback

    HIGH POWER NIGHT SETBACK This function acts to raise the power but keeps the AC system in When NIGHT SETBACK operation is set, the temperature and the same operating mode. fan speed settings will be adjusted automatically to allow This function is set with the HIGH POWER button on the remote comfortable sleep.

  • Page 49: Protective Functions

    8-2. Protective Functions Overload prevention during heating Cold-air prevention during heating During HEAT operation, the temperature of the indoor heat During heating, the fan speed is set to "LL" (very low) or stopped. exchanger is used to control the frequency and lessen the load As the temperature of the indoor heat exchanger rises, the fan on the compressor before the protective device is activated.

  • Page 50: Defrost Detection And Release

    • When the cause of the increase in electrical current is rectified, the system will resume operation in the original mode. Heating operation <CS-KE12NB41> Outdoor fan ON Cooling Dry Heating 4-way valve ON Peak current cut-off trips 22.5...

  • Page 51: Troubleshooting (Before Calling For Service)

    9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE) 9-1. Precautions before Performing Inspection or Repair After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair. High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge (charging voltage DC 310V) even after the power is turned OFF, and some time is required for the charge to dissipate.

  • Page 52: Operation Lamp

    (1) Self-diagnostics Lamps INDOOR UNIT OPERATION button OPERATION lamp TIMER lamp HIGH POWER lamp REMOTE CONTROL receiver Since the indications cover various units, the corresponding parts listed below may not be present in some models..OFF ..BLINKING ..ON INDICATION ON INDOOR UNIT HIGH OPERATION...

  • Page 53: Checking The Indoor And Outdoor Units

    (2) If the self-diagnostics function fails to operate • No indicators illuminate and the Check the indoor unit. indoor fan does not rotate. • Check the power voltage. Blown Is the fuse blown? Normal Replace the circuit board or the fuse. Replace the controller.
  • Page 54 (3) Serial Communication Error Identification Procedure If the lamps on the main body show the following conditions after the completion of self-diagnostics, a communication error between the indoor unit and outdoor unit might be considered. In such a case, identify the breakdown section by using the following procedure. NOTE Refer to "Method of Self-Diagnostics"...
  • Page 55 ( Continued from the previous page A. ) ( Continued from the previous page B. ) Is the voltage of about DC22V to 24V given between the terminals 2 and 3 on the indoor unit terminal strip (Serial Communication Line) ? (Fig.
  • Page 56 (3-2) Condition: E12 Troubleshooting Serial Communication Outdoor Unit Power 1. Turn off the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF. 2. Disconnect the cable from the terminal 3 on the Outdoor Indoor Unit unit terminal strip.

  • Page 57: Trouble Diagnosis Of Fan Motor

    * Disconnect the motor connectors and measure the voltage at the DC motor connectors on the indoor unit controller (3 locations). Measurement location Normal value CS-KE12NB41 CS-KE18NB4UW (1) Vm-Gnd: Between pin 1 and pin 3 DC 130V to 195V DC 280V to 340V...
  • Page 58 9-4-2. Outdoor Fan Motor This outdoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil resistance, and the following procedure should be used to check the motor. Perform the trouble diagnosis by Test Run mode described on Installation Instructions. Important: (A) Turn OFF the power before connecting or disconnecting the motor connectors.

  • Page 59: Noise Malfunction And Electromagnetic Interference

    9-5. Noise Malfunction and Electromagnetic Interference An inverter A/C operates using pulse signal control and high frequencies. Therefore, it is susceptible to the effects of external noise, and is likely to cause electromagnetic interference with nearby wireless devices. A noise filter is installed for ordinary use, preventing these problems. However, depending on the installation conditions, these effects may still occur.

  • Page 60: Checking Electrical Components

    10. CHECKING ELECTRICAL COMPONENTS 10-1. Measurement of Insulation Ground wire Resistance Clip The insulation is in good condition if the resistance exceeds 1M ohm. Probe 10-1-1. Power Supply Cord Insulation Clamp the grounding wire of power cord with the lead tester Fig.

  • Page 61: Checking Continuity Of Fuse On Pcb Ass'y

    10-2. Checking Continuity of Fuse Fuse on PCB Ass'y Remove the PCB Ass'y from the electrical component box. Then pull out the fuse from the PCB Ass'y. (Fig. 5) Check for continuity using a multimeter as shown in PCB Ass'y Fig.

  • Page 62: Refrigerant R410A: Special Precautions When Servicing Unit

    11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 11-1. Characteristics of New Refrigerant R410A 11-1-1. What is New Refrigerant R410A? R410A is a new refrigerant that contains two types of pseudo-non-azeotropic refrigerant mixture. Its refrigeration capacity and energy efficiency are about the same level as the conventional refrigerant, R22. 11-1-2.

  • Page 63: Checklist Before Servicing

    11-2. Checklist before Servicing Use a clutch-type flare tool for R410A or the conventional flare tool. Note that sizes of the resultant flares differ between these two tools. Where a conventional flare tool is used, make sure to observe A Specification (amount of extrusion) by using the flare spacer.

  • Page 64: Tools Specifically For R410A

    11-3. Tools Specifically for R410A For servicing, use the following tools for R410A Tool Distinction Tool Name Gauge manifold Charging hose Gas leak detector Refrigerant cylinder Charging cylinder Refrigerant recovery unit Vacuum pump with anti-reverse flow (*1) Tools specifically for R410A (Solenoid valve-installed type, which prevents oil from flowing back into the unit when the power is off, is recommended.) Vacuum pump (*2)...can be used if the following adapter is attached.

  • Page 65: In Case Of Compressor Malfunction

    11-5. In Case of Compressor Malfunction Should the compressor malfunction, be sure to make the switch to a replacement CAUTION compressor as quickly as possible. Use only the tools indicated exclusively for R410A. See "11-3. Tools Specifically for R410A." 11-5-1. Procedure for Replacing Compressor (1) Recovering refrigerant Any remaining refrigerant inside the unit should not be released to the atmosphere, but recovered using the...
  • Page 66 Configuration and characteristics of cylinders (5) Recharging Valve Be sure to charge the specified amount of refrigerant in liquid state using the service port of the wide tube service valve. The proper amount is listed on the unit's nameplate. When the entire amount cannot be charged all at once, charge gradually while operating the unit in Cooling Operation.

  • Page 67: In Case Refrigerant Is Leaking

    11-6. In Case Refrigerant is Leaking Never attempt to charge additional refrigerant when refrigerant has been leaking CAUTION from the unit. Follow the procedure described below to locate points of leaks and carry out repairs, then recharge the refrigerant. (1) Detecting Leaks Use the detector for R410A to locate refrigerant leak points.

  • Page 68: Charging Additional Refrigerant

    11-7. Charging Additional Refrigerant 11-7-1. When Tubes are Extended Observe the proper amount of refrigerant as stated in this service manual or the installation manual that came with the indoor unit. Charge additional refrigerant in liquid state only. Never charge additional refrigerant if refrigerant is leaking from the unit. Follow CAUTION instructions given in "11-6.

  • Page 70: Appendix A Operating Instructions

    APPENDIX A Operating Instructions CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU (852-6-4181-213-00-2)

  • Page 71: Operating Instructions

    Operating Instructions Split System Air Conditioner Model No. Indoor Units Outdoor Units (For Single use) CS-KE12NB41 CU-KE12NK1 CS-KE18NB4UW CU-KE18NKU (For Multiple use) CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU Ceiling Panel CZ-18BT1U This air conditioner uses the refrigerant R410A. “Multiple use” is applied for the model CS-KE18NB4UW only.

  • Page 72: Features

    FEATURES This air conditioner is an inverter type unit that automatically adjusts capability as appropriate. Details on these functions are provided below; refer to these descriptions when using the air conditioner. • Microprocessor Controlled Operation • Automatic Switching between Cooling and Heating The interior compartment of the remote controller contains When the remote controller’s S/M switch is at the “S”...

  • Page 73: Installation Location

    INSTALLATION LOCATION • To prevent possible hazards from insulation failure, the unit must be grounded. • We recommend that this air conditioner be installed • Do not clean inside the indoor and outdoor units by users. properly by qualified installation technicians in Engage authorized dealer or specialist for cleaning.

  • Page 74: Names Of Parts

    NAMES OF PARTS UNIT DISPLAY AND OPERATION BUTTON INDOOR UNIT INDOOR UNIT Air Intakes OPERATION button OPERATION lamp Air Outlet TIMER lamp (4 locations) HIGH POWER lamp REMOTE CONTROL receiver Remote Controller IMPORTANT Refrigerant Tubes Avoid using radio equipment such as mobile phone near (within OUTDOOR UNIT 4 ft.
  • Page 75 REMOTE CONTROLLER (DISPLAY) Displayed when transmitting data Displayed when indoor unit sensor is in use Displayed when setting temperature Displayed when temperature is shown Displayed when setting timer Displayed when the time display is set to 12-hour time. Symbols (1) Operation mode (4) Timer AUTO ........
  • Page 76 REMOTE CONTROLLER Transmitter When you press the buttons on the remote controller, the mark appears in the display to transmit the setting changes to the receiver in the air conditioner. Display Information on the operating conditions is displayed while the remote controller is switched on.
  • Page 77 Sensor A temperature sensor inside the remote controller senses the room temperature. ON/OFF operation button This button is for turning the air conditioner on and off. 1 HR. TIMER button (1-HOUR OFF TIMER) : When you press this button, regardless of whether the unit is operating or stopping, the unit operates for one hour and then shuts down.

  • Page 78: Using The Remote Controller

    USING THE REMOTE CONTROLLER HOW TO INSTALL BATTERIES HOW TO USE THE REMOTE CONTROLLER When using the remote controller, always point the unit’s transmitter head directly at the air conditioner’s receiver. Air Conditioner (Indoor unit) Receiver ACL button Slide the cover in the direction indicated by the arrow and remove (Transmitter Remote Controller head)

  • Page 79: Operation With The Remote Controller

    OPERATION WITH THE REMOTE CONTROLLER 1. Automatic Operation 2. Manual Operation When the remote controller’s S/M switch is at the “S” (Single) position This unit automatically switches between cooling operation and heating operation according to the difference between the room temperature and the temperature setting.

  • Page 80: Adjusting The Fan Speed

    3. Adjusting the Fan Speed A. In Cooling and DRY Mode: ( A. Automatic fan speed When the night setback mode is selected, the air conditioner Simply set the FAN SPEED selector button to the automatically raises the temperature setting 2 °F when 30 minutes have passed after the selection was made, and then another 2 °F position.

  • Page 81: Special Remarks

    SETTING THE TIMER • When the HIGH POWER button is pressed, the unit operates at maximum output for 30 minutes, regardless of the desired temperature. The fan speed is 1 step above “High”. • HIGH POWER Mode cannot be used when the operation mode is in Automatic Operation.
  • Page 82 2. How to set the OFF time 4. How to set daily ON/OFF repeat timer (Example) To stop the air conditioner at 11:00 am. (Example) To start operation at 7:10 am. and stop the air conditioner at 11:00 am. 10:30 pm. 7:10 am.

  • Page 83: Using The 1-Hour Off Timer

    USING THE 1-HOUR OFF ADJUSTING THE AIRFLOW TIMER DIRECTION The vertical airflow can be adjusted by moving the flap with the 1. 1-Hour OFF Timer remote controller. Do not move the flap with your hands. Confirm that the remote controller has been turned on. Use the FLAP button to set either the sweep function or one of the six airflow direction settings.

  • Page 84: Operation Without The Remote Controller

    OPERATION WITHOUT THE CARE AND CLEANING REMOTE CONTROLLER • Cleaning and maintenance operations must be carried out by specially INDOOR UNIT trained personnel. While working in high places, slipping or falling may result in serious injury. • For safety, be sure to turn the air conditioner off and also to disconnect the power before cleaning.
  • Page 85 Air filter How to remove the air intake grille The air filter collects dust and other particles from the air and should Open the air intake grille. be cleaned once every 6 months. Detach the safety cord from the frame (remember to attach it If the filter gets blocked, the efficiency of the air conditioner drops again after cleaning or maintenance).

  • Page 86: Troubleshooting (Before Calling For Service)

    TROUBLESHOOTING OPERATING RANGE (BEFORE CALLING FOR SERVICE) The air conditioner is operable within the temperature ranges as listed below: If your air conditioner does not work properly, first check the following Temperature Indoor air Outdoor air points before requesting service. If it still does not work properly, temperature temperature contact your dealer or service center.
  • Page 87 SPECIFICATIONS • For Single use Outdoor Unit Indoor Unit Model No. CU-KE12NK1 CS-KE12NB41 Power Source Single-phase, 115 V, 60 Hz 3.50 [ 0.90 ~ 3.50 ] Cooling Capacity 11,900 [ 3,000 ~ 11,900 ] BTU/h 4.00 [ 0.90 ~ 4.00 ]...
  • Page 88 SPECIFICATIONS (CONTINUED) • For Multiple use Indoor Unit Model No. CS-KE18NB4UW Power Source Single-phase, 208-230 V, 60 Hz 5.15 Cooling Capacity 17,500 BTU/h 6.00 Heating Capacity 20,400 BTU/h Cooling Operation dB(A) 44/40/36 Operation (H/M/L) Sound Heating Operation dB(A) 44/40/36 (H/M/L) 11-5/32×22-5/8×22-5/8 Unit Dimensions (H×W×D) inch(mm)
  • Page 90 APPENDIX B INSTALLATION INSTRUCTIONS CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU (852-6-4190-577-00-2)

  • Page 91: Installation Instructions

    1-3. Optional Copper Tubing Kit Model No. 1-4. Type of Copper Tube and Insulation Material 1-5. Additional Materials Required for Installation Indoor Unit Outdoor Unit CS-KE12NB41 CU-KE12NK1 INSTALLATION SITE SELECTION ....5 2-1. Indoor Unit Power Source: 2-2. Outdoor Unit...

  • Page 92: Please Read Before Starting

    IMPORTANT! When Transporting Please Read Before Starting Be careful when picking up and moving the indoor and out- door units. Get a partner to help, and bend your knees when This air conditioning system meets strict safety and operating lifting to reduce strain on your back. Sharp edges or thin alu- standards.
  • Page 93 Others the flare and union tubes before connecting them, CAUTION then tighten the nut with a torque wrench for a leak- free connection. the refrigeration system. Escaped refrigerant gas, on contact with fire or heat, can produce dangerously or re-installation, and while repairing refrigeration parts. toxic gas.
  • Page 94 Narrow Tube Wide Tube and regulations before Model Outer Dia. Thickness Outer Dia. Thickness obtaining wire. Also, check CS-KE12NB41 1/4" (6.35 mm) 0.0314" (0.8 mm) 3/8" (9.52 mm) 0.0314" (0.8 mm) any specified instructions or limitations. CS-KE18NB4UW 1/4" (6.35 mm) 0.0314"...

  • Page 95: Installation Site Selection

    Additional Refrigerant (ft.) (ft.) (ft.) (oz./ft.)* CS-KE12NB41 0.16 CS-KE18NB4UW 0.27 * If total tubing length becomes 25 to 65 ft. (Max.) or 25 to 100 ft. (Max.), charge additional refrigerant (R410A) by 0.16 or 0.27 oz./ft. No additional charge of compressor oil is necessary. For more detailed charging information, refer to the Technical & Service Manual.
  • Page 96 2-2. Outdoor Unit Exhaust fan AVOID: Hot air heat sources, exhaust fans, etc. (Fig. 3) Heat source damp, humid or uneven locations. Outdoor unit choose a place as cool as possible. choose a place that is well ventilated. Fig. 3 install in a location where at least two sides are unob- structed, so that the flow of air at the intake port or exhaust port is not blocked, and so that sufficient...

  • Page 97: How To Install The Indoor Unit

    3. How to Install the Indoor Unit Hole-in-anchor Concrete Insert Hole-in-plug 3-1. Preparation for Suspending This unit uses a drain pump. Use a carpenter’s level to check that the unit is level. 3-2. Suspending the Indoor Unit Suspension bolt (M10 or 3/8") (1) Fix the suspension bolts securely in the ceiling using (locally purchased) the method shown in the diagrams, by attaching...
  • Page 98 Twist tie 3-4. Installing the Drain Piping (4 vinyl ties, supplied) Hard PVC pipe Drain hose (1) Prepare standard hard PVC pipe (locally purchased O.D. Position to Drain port (equivalent to insulation O.D. 1-1/32" (26mm)) fasten hose 1-1/32" (26 mm)) for the drain and use the supplied hose (supplied) bands (locally purchased)
  • Page 99 3-5. Checking the Drainage Water drain After wiring and drain piping are completed, use the following pro- cedure to check that the water will drain smoothly. For this, pre- pare a bucket and wiping cloth to catch and wipe up spilled water. Be sure to do the wiring between the units before installing the ceiling panel.
  • Page 100 (2) Removing the corner cover and indicator cover a) While lightly pressing the cen- ter of the corner cover, pull up the tab for the screw hole. Use the same procedure to Corner cover Press remove the indicator cover. (Fig. 6-16) Pull up Indicator cover Fig.
  • Page 101 3-6-3. Wiring the Ceiling Panel and the Indicator Drain pipe side (1) Remove the 2 screws from the control box cover, then open the cover. Be careful that the cover does not fall. (2) Connect the 5P FLAP wiring connector from the ceiling Control box panel to the connector on the control PCB in the control box.
  • Page 102 3-6-5. Checking After Installation Check that there are no gaps between the unit and the ceiling panel, or between the ceiling panel and the ceiling sur- face. Gaps may cause water leakage and condensation. Check that the wiring is securely connected. If it is not securely connected, the auto flap will not operate.
  • Page 103 Table 4 Cross-Sectional (A)+(B) (A) Power Supply Wiring Length (ft) (C) Control Fuse or Circuit Area (AWG) (B) Power Line Length (ft) Line Length (ft) Breaker Capacity Model (#14) (#12) (#14) CU-KE12NK1 131 (Max.) 230 (Max.) 65 (Max.) CU-KE18NKU 131 (Max.) 230 (Max.) 100 (Max.) # ...
  • Page 104 3-9. Wiring Instructions for Inter-unit Connections (1) Remove the 1 screw from the terminal cover, then open the cover. Be careful that the cover does not fall. (2) Remove the 3 screws from the power box cover, then open the cover. Be careful that the cover does not fall. (3) Use the screw to securely fasten the ground wire from the outdoor unit in place.

  • Page 105: How To Install The Outdoor Unit

    For stranded wiring (1) Cut the wire end with a cutting pliers, then strip the insulation to expose the stranded wiring about 3/8" (10 mm) and tightly twist the wire ends. (Figs. 11 and 12) (2) Using a screwdriver, remove the terminal screw(s) on the terminal plate. (3) Using a ring connector fastener or pliers, securely clamp each stripped wire end with a ring connector.

  • Page 106: Refrigerant Tubing

    5. Refrigerant Tubing Deburring Before After 5-1. Use of the Flaring Method Many of the conventional split system air conditioners employ the flaring method to connect refrigerant tubes which run between indoor and outdoor units. In this method, the copper tubes are flared at each end and connected with flare nuts.

  • Page 107: Connecting Tubing Between Indoor And

    5-4. Connecting Tubing between Indoor and Torque wrench Outdoor Units a) Tightly connect the indoor side refrigerant tubing exten- Spanner Indoor unit ded from the wall with the outdoor side tubing. (Fig. 21) b) To fasten the flare nuts, apply specified torque as: Outdoor unit Table 5 Fig.

  • Page 108: Air Purging

    5-6. Taping the Tubes (1) At this time, the 2 refrigerant tubes (and electrical wire if local codes permit) should be taped together with armoring tape. The drain hose may also be included and taped together as 1 bundle with the tubing. (2) Wrap the armoring tape from the bottom of the outdoor unit to the top of the tubing where it enters the wall.
  • Page 109 (4) With the “Lo” knob of the manifold valve open, run NOTE the vacuum pump. The operation time for the vacu- um pump varies with tubing length and the capacity To prevent other refrigerants from being mistakenly of the pump. The following table shows the amount charged to units which use R410A, the size of the of time for evacuation: charge port on the service valve is different from the...
  • Page 110 How to Test Run the Air Conditioner After turning on the power of the air conditioner, use the remote controller and follow the steps below to conduct the test run. (1) Set the remote controller in Test Run mode. (Fig. 29) a)Press and hold the HIGH POWER button and the 1HR.

  • Page 111: Basic Functions Of The Service Valves

    Basic Functions of the Service Valves The basic functions of the service valves are given in Table 7 below. Table 7 Narrow Tube Service Wide Tube Service Action Valve (2-Way) Valve (3-Way) O-ring Valve cap CLOSED Stem Shipping Fully OPEN Operating and test running the air conditioner...

  • Page 112: Service Valve Connections

    Service Valve Connections a) Temporary connection: Screw in 3 – 5 turns by hand. (Fig. 34) b) To fasten the flare nuts, apply specified torque as Table 8 and Fig. 35. Table 8 Fig. 34 Tube Dia. Tightening Torque 1/4" (6.35 mm) 21/32"...
  • Page 113 8. Address Switch 8-1. Address Setting of the Remote Controller The address can be set in order to prevent interfer- ence between remote controllers when 2 indoor units are installed near each other. The address is normally set to “A.” To set a different address, it is necessary to change the address on the second remote controller.
  • Page 114 APPENDIX C Operating Instructions CZ-RD515U (852-6-4181-230-00-1)

  • Page 115: Wired Remote Controller

    “COOL/DRY Model” indoor unit. Once the wired remote controller is connected, the wireless remote controller cannot be used. Before operating the unit, read these operating instructions thoroughly and keep them for future reference. Panasonic Corporation 1006 Kadoma, Kadoma City, Osaka, Japan 85264181230001 CV6233187877...

  • Page 116: Safety Precautions

    FEATURES • Microprocessor Controlled Operation • Air Sweep Control The interior compartment of the remote controller contains several This function moves a flap up and down in the air outlet, directing features to facilitate automatic operation, easy logically displayed air in a sweeping motion around the room and providing comfort in for easy use.

  • Page 117: Installation Location

    INSTALLATION LOCATION • To prevent possible hazards from insulation failure, the unit must be grounded. We recommend that this wired remote controller be • Do not clean inside the indoor and outdoor units by users. installed properly by qualified installation technicians Engage authorized dealer or specialist for cleaning.

  • Page 118: Remote Controller

    REMOTE CONTROLLER NOTE The descriptions on the AUTO ( ) or HEAT ( ) operation mode are only for the “COOL/DRY/HEAT Model,” and not for the “COOL/DRY Model.” Display Information on the operating conditions is displayed while the remote controller is switched on. If the unit is turned off, only the mode that was set previously is still displayed.
  • Page 119 ON/OFF operation button This button is for turning the air conditioner on and off. MODE selector button Use this button to select AUTO, HEAT, DRY, COOL or FAN mode. (AUTO) : When this setting is selected, the air conditioner calculates the difference between the thermostat setting and the room temperature and automatically switches to the ‘‘COOL’’...
  • Page 120 REMOTE CONTROLLER (DISPLAY) Displayed when indoor unit sensor Displayed when operating NIGHT is in use SETBACK mode Displayed when setting temperature Displayed when temperature is shown Displayed when setting timer Symbols (1) Operation mode (3) Temperature setting 60 – 86 °F ......AUTO ........

  • Page 121: Operation With The Remote Controller

    OPERATION WITH THE REMOTE CONTROLLER 1. Automatic Operation 2. Manual Operation (only for COOL/DRY/HEAT Model) • Single use This unit automatically switches between cooling operation and heating operation according to the difference between the room temperature and the temperature setting. •...

  • Page 122: Adjusting The Fan Speed

    3. Adjusting the Fan Speed A. In Cooling and DRY Mode: ( A. Automatic fan speed When the night setback mode is selected, the air conditioner Simply set the FAN SPEED selector button to the automatically raises the temperature setting 2 °F when 30 minutes have passed after the selection was made, and then another 2 °F position.

  • Page 123: Setting The Timer

    SETTING THE TIMER 3. How to set the ON time (Example) To start operation at 7:10 am. ON TIME Present time Operation Indication Press the SET button once. The timer indication alone flashes and the previous set- time is only displayed. •...

  • Page 124: Using The 1-Hour Off Timer

    USING THE 1-HOUR OFF ADJUSTING THE AIRFLOW TIMER DIRECTION The vertical airflow can be adjusted by moving the flap with the 1. 1-Hour OFF Timer remote controller. Do not move the flap with your hands. Confirm that the remote controller has been turned on. Use the FLAP button to set either the sweep function or one of the six airflow direction settings.

  • Page 126: Appendix D Installation Instructions

    APPENDIX D INSTALLATION INSTRUCTIONS CZ-RD515U (852-6-4190-592-00-0)
  • Page 127 INSTALLATION INSTRUCTIONS Wired Remote Controller In order to install this wired remote controller onto a wall-mounted model, the connection kit IMPORTANT (CZ-RC515U or CZ-RC515UA), which must be purchased separately, is required. Once the wired remote controller is connected, the wireless remote controller cannot be used. Table 1 Parts supplied with the remote controller Parts...
  • Page 128 A. Installing with in-wall junction box In-wall junction box (locally purchased) (1) Install the junction box (locally purchased) into the wall. (Figs. 2-a and 3) (2) Pass the wire harness through the junction box and conduit. (Fig. 3) (3) Insert a flathead screwdriver into the 5 tab locations and disconnect the back plate of the remote controller by 2-3/8"...
  • Page 129 How to wire the remote controller 5P FLAP 7P IND and 4P RC Ceiling wiring connector wiring connector panel (1) Turn OFF the power and remove the ceiling panel air-intake grille. (Refer to 3-6-1 Before Installing the Ceiling Panel in the Installation Instructions supplied with the indoor unit.) (2) Remove the 3 power box cover screws and 2 control box cover screws, then remove both covers.
  • Page 130 How to Test Run the Air Conditioner After turning on the power of the air conditioner, use the remote controller and follow the steps below to conduct the test run. (1) Set the remote controller in Test Run mode. (Fig. 9) a)Press and hold the NIGHT SETBACK button and ON/OFF the 1HR.
  • Page 132 DC1111-0...

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