Panasonic CZ-18BT1U + CU-KS18NKUA, CS-KS12NB41 Trouble Diagnosis of Fan Motor, Indoor Fan Motor

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9-4. Trouble Diagnosis of Fan Motor

9-4-1. Indoor Fan Motor

This indoor 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.

To perform diagnosis, operate the unit in cooling mode with indoor fan speed "High". Next, make sure that the indoor unit receive the signals from the remote controller when the ON/OFF operation button is pressed.

Important: (A) Turn OFF the power before connecting or disconnecting the motor connectors.

(B)When performing voltage measurement at the indoor controller connector for (3) in the table below, the DC motor will trip and voltage output will stop approximately 1 minute after operation is started. For this reason, to measure the voltage again, turn OFF the unit once using the remote controller, and then start the air conditioner again.

[Trouble symptom 1] The fan does not stop when the unit stops. Indoor unit controller trouble.

[Trouble symptom 2] The fan motor does not rotate when the unit is operating.

(Diagnostic procedure)

*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-KS12NB41

CS-KS18NB4UW

 

 

 

(1) Vm-Gnd: Between pin 1 and pin 3

DC 130V to 195V

DC 280V to 340V

 

 

 

(2) Vcc-Gnd: Between pin 4 and pin 3

DC 15V +/- 10%

(3) Vs-Gnd: Between pin 5 and pin 3

Fluctuation between DC 1.8V to 5.7V

 

 

 

 

(Diagnostic results)

All of the above measured values are normal. Fan motor trouble (Replace the motor.)

Any one of the above measured values is not normal. Indoor unit controller trouble (Replace the controller .)

(Reference) DC motor connector pin arrangement Pin 1: Vm (red)

Pin 2: Not used

Pin 3: Gnd (black)

Pin 4: Vcc (white)

Pin 5: Vs (yellow)

Pin 6: PG (blue)

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

(There is trouble in the system that provides feedback of motor rotation speed from the motor to the indoor unit controller.)

[Trouble symptom 4] Fan motor rotation speed does not change during indoor unit operation.

[Trouble symptom 5] Fan motor rotation speed varies excessively during indoor unit operation.

(Remedy for symptom 3 to 5)

It is not possible to identify whether the trouble is indoor unit controller trouble or motor trouble. Therefore, first replace the indoor unit controller, then (if necessary) replace the DC motor.

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Contents DC Inverter Split System AIR Conditioner Safety Precautions Prohibit Table of Contents Checking Electrical Components Operating Range Models CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKUModels CS-KS12NB41 & CZ-18BT1U + CU-KS12NK1A Unit Specifications SpecificationsIndoor Unit Outdoor UnitDimensions & Weight Indoor Unit 208V Unit Dimensions Height Inch mm 12-5/16 Outdoor Unit CU-KS12NK1A CS-KS12NB41 & CZ-18BT1UCU-KS12NK1A Outdoor Unit CU-KS18NKUA 230V CU-KS18NKUA Indoor Unit Outdoor Unit CU-KS18NKUA 208V Indoor Unit Major Component SpecificationsIndoor Unit Body CS-KS12NB41 Indoor Unit Panel CZ-18BT1UCB-CS-KS18NB4U Indoor Unit Body CS-KS18NB4UWOutdoor Unit CU-KS18NKU Outdoor UnitControl Circuit Fuse 125V 25A Outdoor Unit CU-KS18NKUA Other Component Specifications Unit inch mm Dimensional DataUnit inch mm 852-0-0010-12600-0 CU-KS18NKUA Refrigerant Flow Diagram Refrigerant Flow DiagramIndoor unit Outdoor unit Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKULow pressure performance chart Temperature ChartsOperating current performance chart Indoor discharge air performance chartTube Cooling Capacity Power Supply 115V Single Phase 60Hz Cooling CapacityPower Supply 230V Single Phase 60Hz Cooling Capacity CS-KS18NB4UW & CZ-18BT1UCU-KS18NKU or CU-KS18NKUA Cooling Capacity Low Ambient TC Total Cooling Capacity BTU/h Electrical Characteristics Electrical DataCooling Outdoor Unit Complete Unit Fan Motor CS-KS12NB41 18BT1U8FA2-5250-46900-2 Outdoor Unit CU-KS12NK1A 8FA2-5251-12300-2 BLK Outdoor Unit CU-KS18NKU CU-KS18NKUAAddress Setting of the Remote Controller MaintenanceHow to Connect How to DisconnectDisassembly Procedure Disconnect the connectors in the control boxRemove the air intake grill Remove the ceiling panel Remove the power box and control box Remove the indoor air temperature sensorScrew Ground cable CN07 CN03 CN09 CN06 Remove the main body lower section Remove the heat exchanger sensor Remove the drain pump and float switchRemove the heat exchanger Remove the turbo fan and fan motorOperation Functions FunctionsEmergency operation PAM- controlLamp colors Timer backupProtective Functions Compressor discharge temperature controlFreeze prevention CT Peak current cut-off controlTroubleshooting Before Calling for Service Precautions before Performing Inspection or RepairMethod of Self-Diagnostics Indoor Unit Self-diagnostics LampsChecking the Indoor and Outdoor Units Using the TEST/T-RUN terminalsReplace the controller Replace the circuit board or the fuseOff Blinking Illuminated Serial Communication Error Identification ProcedureBefore the Operation Condition E01From the previous page a Condition E12 Indoor Fan Motor Trouble Diagnosis of Fan MotorOutdoor Fan Motor Noise Malfunction and Electromagnetic Interference Noise malfunctionElectromagnetic interference Checking Electrical Components Power Supply CordMeasurement of Insulation Resistance Measurement of Insulation Resistance for Electrical PartsChecking Continuity of Fuse on PCB Assy Characteristics of New Refrigerant R410A Refrigerant R410A Special Precautions When Servicing UnitWhat is New Refrigerant R410A? CharacteristicsChecklist before Servicing Tools Specifically for R410A Tubing Installation ProceduresCase of Compressor Malfunction Procedure for Replacing CompressorAmount in the charging cylinder is less than 20% ExampleTo prevent the composition Case Refrigerant is Leaking Welding leaking pointsRecharging Charging Additional Refrigerant When Tubes are ExtendedRetro-Fitting Existing Systems Use of Existing Units

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