Sanyo XMS1272, XMS0972 service manual Trouble Diagnosis of Fan Motor, Indoor Fan Motor

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8-4. Trouble Diagnosis of Fan Motor

8-4-1. 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

(1)

Vm-Gnd: Between pin 1 and pin 3

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 17,500BTU / h 11,900BTU / hSafety Precautions Prohibit Table of Contents STK-RCS-7TWSUA Applicable MULTI-OUTDOOR Units Indoor Air Intake Temp Outdoor Air Intake Temp Operating RangeUnit Specifications SpecificationsIndoor Unit XMS0972 & PNR-XS1872 XMS0972 & PNR-XS1872 Indoor Unit208V XMS1272 & PNR-XS1872 XMS1272 & PNR-XS1872 XS1872 & PNR-XS1872 XS1872 & PNR-XS1872 Indoor Unit Major Component SpecificationsIndoor Unit Body XMS0972 Indoor Unit PanelIndoor Unit Body XMS1272 Indoor Unit Body XS1872 ModelKTEC-35-S98 Other Component SpecificationsIndoor heat exchanger sensor ModelPT2M-51H-S3534 Dimensional DataRefrigerant Flow Diagram Refrigerant Flow DiagramIndoor Unit XS1872 & PNR-XS1872 Indoor unit 5250-46900 Electrical Data8FA2 Disassembly Procedure MaintenanceDisconnect the connectors in the control box Remove the air intake grillRemove the ceiling panel Remove the power box and control box Remove the indoor air temperature sensorScrew Ground cable CN07 ScrewCN03 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 backupFreeze prevention Protective FunctionsPrecautions before Performing Inspection or Repair TroubleshootingMethod of Self-Diagnostics Self-diagnostics Lamps Checking the Indoor and Outdoor Units Using the TEST/T-RUN terminalsReplace the controller Replace the circuit board or the fuseBefore the Operation Serial Communication Error Identification ProcedureOff Blinking Illuminated Condition E01Terminal board Outdoor Unit Condition E12 Indoor Fan Motor Trouble Diagnosis of Fan MotorNoise malfunction Noise Malfunction and Electromagnetic InterferenceElectromagnetic interference Locations most susceptible to noise Trouble CorrectionXMS0972 & PNR-XS1872 XMS1272 & PNR-XS1872 Pub. OI-85264181141000 Sanyo Mode D’EMPLOIContents FeaturesInstallation Location Alert SymbolsSafety Instructions Product InformationUnit Display and Operation Button Names of PartsSymbols Remote Control Unit DisplayRemote Control Unit Temperature setting buttons Temp HR. Timer button 1-HOUR OFF TimerMode selector button SensorUsing the Remote Control Unit Automatic fan speed Operation with the Remote Control UnitManual fan speed Cooling and DRY Mode Setting the TimerSpecial Remarks How it works?1030 pm 710 am 1100 am Present time Operation IndicationAdjusting the Airflow Direction Using the 1-HOUR OFF TimerTips for Energy Saving Do notWhen the air conditioner is not running Care and CleaningCleaning the flaps Cleaning the main unit and remote control unitHow to remove the air intake grille How to remove the filterAir filter Care After a prolonged idle periodWired Remote Controller TroubleshootingOperating Range XS1872 & PNR-XS1872 Pub. OI-85264181108001 Sanyo XS1271 XS1872OI-108-2-EG Important Multiple use is applied for the model XS1872 only OI-108-4-EG OI-108-5-EG OI-108-6-EG OI-108-7-EG OI-108-8-EG OI-108-9-EG OI-108-10-EG OI-108-11-EG OI-108-12-EG OI-108-13-EG OI-108-14-EG OI-108-15-EG Appendix C Installation Instructions For Indoor Unit ContentsPlease Read Before Starting For safe installation and trouble-free operation, you must…In a Ceiling or Wall …In a RoomAccessories Supplied with Unit Table Tools Required for Installation not suppliedGeneral Optional Copper Tubing KitAdditional Materials Required for Installation Installation Site SelectionH1, H2, H3, H4 Embedding the Tubing and WiringPreparation for Suspending How to Install the Indoor UnitSuspending the Indoor Unit Placing the Unit Inside the CeilingDo not install an air bleeder as Installing the Drain PipingAttach so that the hose band Fastener is on the side10a Checking the DrainageIndoor unit Gaps Ceiling surface Ceiling panel Installing the Ceiling PanelAttaching the air-intake grille Wiring the Ceiling Panel and the IndicatorWhen Removing the Ceiling Panel for Servicing Checking After InstallationAdjusting the Auto Flap Wiring Instructions General precautions on wiringFor Outdoor Unit For solid core wiring or F-cable How to connect wiring to the terminal For Indoor UnitFor stranded wiring How to Test Run the Air Conditioner Rear side Remote control unit mount Remote Control Unit Installation PositionTo take out the remote control unit, pull it forward Mounting on a WallAddress Setting of the Remote Control Unit Address SwitchInstallation Check Sheet Connecting a Home Automation DeviceSTK-RCS-7TWSUA Pub. OI-85264181139000 Sanyo STK-RCS-7TWSUADo not cool or heat the room too much Hot Start Heating System SET button Timer and Present Time setting buttonsAuto Timer Select buttonAutomatic Operation Only for COOL/DRY/HEAT Model Heating Mode Only for COOL/DRY/HEAT Model Remote Control Unit DisplayDaily on / OFF Programmed910 pm 710 am 1130 pm Present time Sweep Cool Drysweep Heat FAN Appendix E Installation Instructions STK-RCS-7TWSUA Remote controller installation guidelines Parts supplied with the remote controllerHow to install the remote controller Installation locationInstalling directly onto the wall Installing with in-wall junction boxHow to wire the remote controller ON/OFF

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