Panasonic CZ-18BT1U + CU-KS12NK1A, CS-KS12NB41, CS-KS18NB4UW service manual Outdoor Fan Motor

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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.

(B)When performing voltage measurement at the outdoor controller connector for (3) in the table below, the DC motor will trip and voltage output will stop approximately 10 seconds after operation is started. For this reason, to measure the voltage again, first turn OFF the outdoor unit power, then, measure the voltage in Test Run mode.

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

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

(Diagnostic procedure)

*Disconnect the motor connectors and measure the voltage at the DC motor connectors on the outdoor unit controller (3 locations).

Measurement location

Normal value

 

 

(1) Vs-Gnd: Between pin 1 and pin 4

DC 110V or more

 

 

(2) Vcc-Gnd: Between pin 5 and pin 4

DC 14V or more

 

 

(3) Vsp-Gnd: Between pin 7 and pin 4

After fluctuating 4 times between DC 1.0 to 4.3V

 

(1 sec. ON) and DC 0 V (1 sec. OFF), the DC

 

motor trips.

 

 

(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. Outdoor unit controller trouble

(Replace the controller .)

(Reference) DC motor connector pin arrangement Pin 1: Vs (white)

Pin 2: Not used

Pin 3: Not used

Pin 4: Gnd (black)

Pin 5: Vcc (red)

Pin 6: FG (blue)

Pin 7: Vsp (yellow)

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

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

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

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

(Remedy for symptom 3 to 5)

It is not possible to identify whether the trouble is outdoor unit controller trouble or motor trouble. Therefore, first replace the outdoor 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 Models CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKU Operating RangeModels CS-KS12NB41 & CZ-18BT1U + CU-KS12NK1A Indoor Unit SpecificationsUnit Specifications Outdoor UnitDimensions & Weight Indoor Unit 208V Unit Dimensions Height Inch mm 12-5/16 CS-KS12NB41 & CZ-18BT1U Outdoor Unit CU-KS12NK1ACU-KS12NK1A Outdoor Unit CU-KS18NKUA 230V CU-KS18NKUA Indoor Unit Outdoor Unit CU-KS18NKUA 208V Indoor Unit Body CS-KS12NB41 Major Component SpecificationsIndoor Unit Indoor Unit Panel CZ-18BT1UIndoor Unit Body CS-KS18NB4UW CB-CS-KS18NB4UOutdoor Unit Outdoor Unit CU-KS18NKUControl Circuit Fuse 125V 25A Outdoor Unit CU-KS18NKUA Other Component Specifications Dimensional Data Unit inch mmUnit inch mm 852-0-0010-12600-0 CU-KS18NKUA Refrigerant Flow Diagram Refrigerant Flow DiagramIndoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU Indoor unit Outdoor unitOperating current performance chart Temperature ChartsLow pressure performance chart Indoor discharge air performance chartTube Power Supply 115V Single Phase 60Hz Cooling Capacity Cooling CapacityCS-KS18NB4UW & CZ-18BT1U Power Supply 230V Single Phase 60Hz Cooling CapacityCU-KS18NKU or CU-KS18NKUA Cooling Capacity Low Ambient TC Total Cooling Capacity BTU/h Electrical Data Electrical CharacteristicsCooling Outdoor Unit Complete Unit Fan Motor 18BT1U CS-KS12NB418FA2-5250-46900-2 Outdoor Unit CU-KS12NK1A 8FA2-5251-12300-2 Outdoor Unit CU-KS18NKU CU-KS18NKUA BLKMaintenance Address Setting of the Remote ControllerHow to Disconnect How to ConnectDisconnect the connectors in the control box Disassembly ProcedureRemove the air intake grill Remove the ceiling panel Remove the indoor air temperature sensor Remove the power box and control boxScrew Ground cable CN07 CN03 CN09 CN06 Remove the main body lower section Remove the drain pump and float switch Remove the heat exchanger sensorRemove the turbo fan and fan motor Remove the heat exchangerEmergency operation FunctionsOperation Functions PAM- controlTimer backup Lamp colorsFreeze prevention Compressor discharge temperature controlProtective Functions CT Peak current cut-off controlPrecautions before Performing Inspection or Repair Troubleshooting Before Calling for ServiceMethod of Self-Diagnostics Self-diagnostics Lamps Indoor UnitReplace the controller Using the TEST/T-RUN terminalsChecking the Indoor and Outdoor Units Replace the circuit board or the fuseBefore the Operation Serial Communication Error Identification ProcedureOff Blinking Illuminated Condition E01From the previous page a Condition E12 Trouble Diagnosis of Fan Motor Indoor Fan MotorOutdoor Fan Motor Noise malfunction Noise Malfunction and Electromagnetic InterferenceElectromagnetic interference Measurement of Insulation Resistance Power Supply CordChecking Electrical Components Measurement of Insulation Resistance for Electrical PartsChecking Continuity of Fuse on PCB Assy What is New Refrigerant R410A? Refrigerant R410A Special Precautions When Servicing UnitCharacteristics of New Refrigerant R410A CharacteristicsChecklist before Servicing Tubing Installation Procedures Tools Specifically for R410AProcedure for Replacing Compressor Case of Compressor MalfunctionExample Amount in the charging cylinder is less than 20%To prevent the composition Welding leaking points Case Refrigerant is LeakingRecharging Retro-Fitting Existing Systems When Tubes are ExtendedCharging Additional Refrigerant Use of Existing Units

CZ-18BT1U + CU-KS18NKU, CZ-18BT1U + CU-KS12NK1A, CZ-18BT1U + CU-KS18NKUA, CS-KS18NB4UW, CS-KS12NB41 specifications

The Panasonic CZ-18BT1U indoor unit, when paired with the appropriate outdoor units like CU-KS18NKU, CU-KS18NKUA, CU-KS12NK1A, CS-KS18NB4UW, and CS-KS12NB41, offers a robust solution for maintaining optimal indoor climates. These units are designed for residential and commercial applications, ensuring reliable heating and cooling performance.

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