Sanyo CH1872, CH2472 Noise Malfunction and Electromagnetic Interference, Noise malfunction

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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. Please pay attention to the points listed below.

(1) Noise malfunction

This refers to the application of high-frequency noise to the signal wires, resulting in abnormal signal pulses and malfunction.

Locations most susceptible to noise

 

Trouble

 

Correction

1.

Locations near broadcast stations where

Either of the following trouble may occur.

 

(The fundamental concept is to make the

2.

there are strong electromagnetic waves

1.

The unit may stop suddenly during

 

system less susceptible to noise.)

Locations near amateur radio (short wave)

 

operation.

 

- Insulate for noise or

3.

stations

2.

Indicator lamps may flicker.

1.

distance from the noise source. -

Locations near electronic sewing machines

 

 

Use shielded wires.

 

and arc-welding machines

 

 

2.

Move unit away from the noise source.

 

 

 

 

 

 

(2) Electromagnetic interference

This refers to noise generated by high-speed switching of the microcomputer and compressor. This noise radiates through space and returns to the electric wiring, affecting any wireless devices (televisions, radios, etc.) located nearby.

Locations most susceptible to noise

Trouble

 

Correction

 

 

 

 

 

1.

A television or radio is located near the

1. Noise appears in the television picture,

1.

Select a separate power source.

2.

A/C and A/C wiring.

or the picture is distorted.

2.

Keep the A/C and A/C wiring at least 1 meter

The antenna cable for a television or

2. Static occurs in the radio sound.

 

away from wireless devices and antenna cables.

 

radio is located close to the A/C and A/C

 

3.

Change the wireless device’s antenna to a high-

 

wiring.

 

 

sensitivity antenna.

3.

Locations where television and radio

 

4.

Change the antenna cable to a BS coaxial cable.

 

signals are weak.

 

5.

Use a noise filter (for the wireless device).

 

 

 

 

 

 

6.

Use a signal booster.

 

 

 

 

 

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Contents Indoor Model No. Product Code No DC Inverter Split System AIR ConditionerPlease Read Before Starting Table of Contents Checking Electrical Components Indoor Air Intake Temp Outdoor Air Intake Temp Operating RangeCH1872 SpecificationsUnit Specifications KHS1872208V CH2472 KHS247212.1 13.5 Indoor Unit Major Component SpecificationsCB-KHS2472 Microprocessor 250V 3A External Finish Outdoor UnitOutdoor Unit CH1872 CompressorOutdoor Unit CH2472 Outdoor air temp sensor Other Component SpecificationsIndoor heat exchanger sensor Compressor temp sensorIndoor Unit KHS1872 Dimensional Data11-17/32 23-15/16 35-7/16900 After a tube has been insulated To break or crack Refrigerant Flow DiagramRefrigerant Flow Diagram Insulation of Refrigerant TubingIndoor discharge air performance chart Temperature ChartsLow pressure performance chart Operating current performance chartHigh pressure performance chart Wide 73F Cooling Capacity Power Supply 230V Single Phase 60Hz Cooling Capacity24,200 BTU/h Indoor Outdoor Cooling Capacity Low Ambient24,200 BTU/h Power Supply 230V Single Phase 60Hz Heating Capacity Heating CapacityTH Total Heating Capacity BTU/h 29,000 BTU/h Heating Vertical distance ft Air Throw Distance ChartsCooling Vertical distance ft Room air temp F 26.7C Fan speed High Horizontal distance ftHeating Voltage208V Cooling Electrical CharacteristicsElectrical Data CH1872 Voltage230V CoolingCH2472 Voltage230V Cooling Electric Wiring Diagrams Indoor Unit KHS1872 KHS24728FA2-5257-70500-0 WHT WHT YEL YEL Maintenance Address Setting of the Remote Control UnitButton Operation HR.TIMER button ACL Reset button How to Connect How to DisconnectAuto cooling/heating operation FunctionsOperation Functions Emergency operationLamp colors Timer backupFreeze prevention Compressor discharge temperature controlProtective Functions Overload prevention during heatingDefrost detection and release CT Peak current cut-off controlReverse-Cycle Defrosting Troubleshooting Precautions before Performing Inspection or RepairMethod of Self-Diagnostics Self-diagnostics Lamps Normal Replace the controllerReplace the circuit board or the fuse Using the TEST/T-RUN terminals Checking the Indoor and Outdoor UnitsChecking the indoor unit Control Check items unit operation Condition E01 Serial Communication Error Identification ProcedureOff Blinking Illuminated Before the OperationTerminal board Outdoor Unit Condition E12 Indoor Fan Motor Trouble Diagnosis of Fan MotorOutdoor Fan Motor Locations most susceptible to noise Trouble Correction Noise Malfunction and Electromagnetic InterferenceNoise malfunction Electromagnetic interferenceMeasurement of Insulation Resistance for Electrical Parts Power Supply CordChecking Electrical Components Measurement of Insulation ResistanceChecking Continuity of Fuse on PCB Assy Characteristics Refrigerant R410A Special Precautions When Servicing UnitCharacteristics of New Refrigerant R410A What is New Refrigerant R410A?Checklist before Servicing Tools Specifically for R410A Tubing Installation ProceduresCase of Compressor Malfunction Procedure for Replacing CompressorExample Never charge a large amountUnit. This may cause Damage to the compressorCase Refrigerant is Leaking Welding leaking pointsRecharging Use of Existing Units When Tubes are ExtendedCharging Additional Refrigerant Retro-Fitting Existing SystemsOI-852-6-4180-801-00-2 Features Contents Alert SymbolsProduct Information Installation Location Safety InstructionsElectrical Requirements Names of Parts Quiet lamp Unit Display and Operation ButtonRemote Control Unit Display Transmitter Remote Control UnitHR. Timer button Advance buttonFAN Speed selector button Quiet buttonButton Time Display Selector button Using the Remote Control UnitTemperature Display Selector How to Install BatteriesUsing the Remote Control Unit Press the ON/OFF operation button Operation with the Remote Control UnitSet the FAN Speed selector button to the setting you want Operation with the Remote Control UnitPress the Mode selector button and select the desired mode Press the TEMP. setting buttons to change the temperatureAdjusting the Fan Speed Night Setback Mode is used for saving energy Cooling and DRY ModeQuiet Mode Special Remarks Setting the Timer Example To set to 1030 pmOperation Indication 1030 pm 710 am 1100 am Present time Setting the TimerHow to set the on time Example To start operation at 710 am To cancel a timer program Press the Cancel buttonOperation together with the Daily ON/OFF Repeat Timer Using the 1-Hour OFF TimerSetting procedure Cancellation procedureSweep function Adjusting the Airflow DirectionSetting the airflow manually HorizontalOperation without the Remote Control Unit Care and CleaningWhen the air conditioner is not running Intake grille Care and CleaningCleaning Grasp both ends of the airNegative ion generator metal electrodes inside plastic case Follow the steps below when the generator has become dirtyMax DB / 71 F WB Min DB / 57 F WB TroubleshootingOperating Range Trouble Possible Cause RemedyAppendix B Installation Instructions Contents Installation InstructionsPlease Read Before Starting Optional Copper Tubing Kit Tools Required for Installation not suppliedAccessories Supplied with Unit Table GeneralAdditional Materials Required for Installation Installation Site SelectionSolid base must not cover the hole of the bottom plate Make a Hole How to Install the Indoor UnitTrical wiring or conduits are Remove the Rear Panel from the UnitInstall the Rear Panel on the Wall If Wooden WallIf Block, Brick, Concrete or Similar Type Wall Remove the Grille to Install the Indoor Unit How to remove the grilleHow to replace the grille Shape the Indoor Side Tubing Wiring Instructions General precautions on wiringAWG Recommended Wire Length and DiameterWiring Instructions for Inter-unit Connections How to connect wiring to the terminal For Indoor Unit For Outdoor Unit For solid core wiring or F-cableFor stranded wiring Right-side tubing MountingSwitching drain hose and drain cap Left-side tubingDrain cap Unit or operate it until all Do not supply power toTubing and wiring to the out To unmount indoor unitHow to Install the Outdoor Unit First refer to . Installation Site SelectionWiring Instructions for the Outdoor Unit Use of the Flaring Method Flaring Procedure with a Flare ToolTo 0.5 mm Adjust so that the amount of tube Refrigerant TubingTo prevent heat loss and wet floors due to dripping of con Connecting Tubing between Indoor and Outdoor UnitsFinishing the Installation Insulation of Refrigerant TubingAir Purging Be sure to completely insert Hex wrench beforeAttempting to turn the valve How to Test Run the Air Conditioner Pump Down Basic Functions of the Service ValvesWhen opening or clos Ing the service valve Stem, use the accessoryMounting on a Wall Remote Control Unit Installation PositionAddress Setting of the Remote Control Unit Address Switch
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