Manuals / Haier / Kitchen Appliance / Freezer

Haier BD-478A System Trouble shooting, Circuit Diagram, Maintenance Service And Trouble Shooting

Models: BD-478A

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CIRCUIT DIAGRAM

CIRCUIT DIAGRAM

Circuit Diagram

Brief description of principle about BD-318A/428A:

Brief description of principle about Thermostat:

When the temperature in the freezer is higher and reaches the value for starting the machine, the thermostat will be closed, the compressor will run; When the temperature in the freezer is lower and reaches the value for closing the machine, the thermostat will be open, thus the compressor will be stop running.

MAINTENANCE SERVICE AND TROUBLE SHOOTING

Maintenance Service and Trouble Shooting

12.1 System Trouble shooting

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Haier BD-478A service manual System Trouble shooting, Circuit Diagram, Maintenance Service And Trouble Shooting

Contents

Manual No.BD-478A FeaturesBD-478A Freezer Haier GroupContents C Capacity. Unit litre D Improve Series Number Product Code Illumination and Series IntroductionPRODUCT CODE ILLUMINNATION AND SERIES INTRODUCTION B The first letter of “FREEZER” in Chinese spellingFEATURES FeaturesUnit Dimension W*D*H SpecificationsSPECIFICATIONS Power Supply V/HzSafety Precautions SAFETY PRECAUTIONS9. Do not refreeze foods, which have been thawed completely SAFETY PRECAUTIONSSafety Precautions 8. Do not operate your freezer in the presence of explosive fumesNET DIMENSION Net DimensionInstallation and Accessory Parts INSTALLATION AND ACCESSORY PARTSINSTALLATION AND ACCESSORY PARTS Installation and Accessory PartsElectrical Requirement Operating Your Freezer INSTALLATION AND ACCESSORY PARTSInstallation and Accessory Parts Adjustable temperature dialINSTALLATION AND ACCESSORY PARTS Installation and Accessory PartsDefrosting and Draining The Freezer System Flow Chart SYSTEM FLOW CHARTFunction Schedule FUNCTION SCHEDULEMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.1 System Trouble shootingCIRCUIT DIAGRAM Circuit Diagram12.1.2 Reasons of electricity leakage of freezer MAINTENANCE SERVICE AND TROUBLE SHOOTINGMaintenance Service and Trouble Shooting 12.1.1 Servicing freezerMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble ShootingIf electricity leakage occurs outside the compressor, please use tetra chloromethane or alcohol to clean it. If the leakage occurs in the inner of compressor, it needs to be changed 12.1.3 Troubleshooting observationMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shooting1 At normal operation conditions, the temperature around the surface of freezer evaporator is nearly the same the thickness of frost layer is similar. If there is no frost at the surface of evaporator bed type freezer at all of its inner wall, or only a small part at the upper, conclusion can be made that the operation of refrigeration system is not normal, the refrigerant is insufficient or there is leakage 12.1.4 Troubleshooting by soundsMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shootingnormal running sounds. If there is heavy buzz that means the motor has not been started normally. If there is bump sound, this means that the suspended spring in the compressor is broken and the compressor is running in tilt. When these matters occur, please change compressor 12.1.5 troubleshooting by touchMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shootingplease move your hand over it quickly, otherwise your hand will be stuck 12.1.6 System noise repairMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shooting6 If the fan supporter is loose and noise is caused, please tighten 12.1.7 Poor freezing effect analysis and solutionsMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shootingnear thermal source or not if the room temperature is too high or not if the condenser is blocked by cloth pieces or paper or dirt or not. Any one of these matters will affect heat radiation of condenser and refrigeration ability will be reduced 12.1.8 How to handle the seal bar for poor sealingMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shooting12.1.11 Freezer problem analysis and service 12.1.9 Why freezer cannot be used at low temperature environment12.1.10 How to know there is problem with compressor motor MAINTENANCE SERVICE AND TROUBLE SHOOTINGposition for suitable temperature Problems4. The knob of temperature controller is at The temperature controller is out ofAdjust adjust its value to ratedThere is mechanical problem in the 6. Temperature around compressor is too12.1.13 Procedure for temperature controller change 12.1.12 Procedure for fan changeMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shooting12.2.1 Freezer cannot be started 12.2 Common freezer problems12.2.2 Operation of freezer is not normal MAINTENANCE SERVICE AND TROUBLE SHOOTINGMaintenance Service and Trouble Shooting 12.3.2 Repair equipment Requirements 12.3.3 Service procedure12.3.4 Changing procedure of R134a compressor 12.3.5 Compressor installation and brazing procedures 12.4 Application and maintenance of freezer 12.4.1 Product characters12.4.2 Notice for use 3 Please don’t leave the freezer at humid or corrosive gas area 12.4.4 Maintenance 12.4.3 Safety notice of product12.4.5 Standard procedure of maintenance 4 Check the casters and change if there is any damage 12.5MAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble ShootingMaintenance Service and Trouble Shooting 12.5.1 Freezer repair tool and equipment12.5.2 Notice for use MAINTENANCE SERVICE AND TROUBLE SHOOTING12.5.3 Procedure for filling equipment MAINTENANCE SERVICE AND TROUBLE SHOOTINGMaintenance Service and Trouble Shooting MAINTENANCE SERVICE AND TROUBLE SHOOTING 12.6 Freezer noise12.6.1 Freezer noise sources 12.6.2 Compressor3 Noise of flowing liquid 12.6.4 Gas flowing sound 12.6.3 How is the sound of water flowing generated?12.6.6 Why the freezer’s noise increases after using sometime? 12.6.7 Why freezer’s noise increases after stop use for sometime?12.6.8 How to reduce freezer’s noise? 12.6.9 why freezer noise changes greater at night?12.6.10 What are the national stipulations for freezer noise? 12.6.11 Why freezer noise measured at home is incorrect?2 Put freezer onto 5-10mm elastic cushion 12.6.13 Why the noises of it type freezers are different? 12.6.16 How to determine that the sound is noise or normal? 12.7.2 Noise test 12.7 National standard for noiseMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shootingthe freezer stops, the measurement must be interrupted and resume 3min 12.8.1 Measuring content 12.8Measuring technology of freezer performance parameterMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shooting12.8.2.1 Sealing performance test of refrigeration system 12.8.2 Test method and instrumentMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shooting12.8.2.5 Leakage of current MAINTENANCE SERVICE AND TROUBLE SHOOTINGMaintenance Service and Trouble Shooting 12.8.2.4 Ground resistorMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shootingmaterial of enclosure structure of test room is made up of 10mm thick MAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shootinga. Its temperature MAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shooting7 Cooling speed Table 6-3 Storage temperature of freezer EXPLODED VIEW Exploded ViewExploded View LIST OF PARTS Parts list0070810207 0075020001 6.The spare parts price on net is FOB Qingdao term