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Haier BD-478A service manual System Flow Chart

Models: BD-478A

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SYSTEM FLOW CHART

System Flow Chart

The refrigeration system of direct cooling single-system freezers belongs to the category of a single-temperature and single-control refrigerating system with only one evaporator and is controlled by a single temperature control.

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Page 13

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Haier BD-478A service manual System Flow Chart

Contents

BD-478A Freezer FeaturesHaier Group Manual No.BD-478AContents PRODUCT CODE ILLUMINNATION AND SERIES INTRODUCTION Product Code Illumination and Series IntroductionB The first letter of “FREEZER” in Chinese spelling C Capacity. Unit litre D Improve Series NumberFEATURES FeaturesSPECIFICATIONS SpecificationsPower Supply V/Hz Unit Dimension W*D*HSafety Precautions SAFETY PRECAUTIONSSafety Precautions SAFETY PRECAUTIONS8. Do not operate your freezer in the presence of explosive fumes 9. Do not refreeze foods, which have been thawed completelyNET DIMENSION Net DimensionInstallation and Accessory Parts INSTALLATION AND ACCESSORY PARTSInstallation and Accessory Parts INSTALLATION AND ACCESSORY PARTSElectrical Requirement Installation and Accessory Parts INSTALLATION AND ACCESSORY PARTSAdjustable temperature dial Operating Your FreezerInstallation and Accessory Parts INSTALLATION AND ACCESSORY PARTSDefrosting and Draining The Freezer System Flow Chart SYSTEM FLOW CHARTFunction Schedule FUNCTION SCHEDULECIRCUIT DIAGRAM 12.1 System Trouble shootingCircuit Diagram MAINTENANCE SERVICE AND TROUBLE SHOOTINGMaintenance Service and Trouble Shooting MAINTENANCE SERVICE AND TROUBLE SHOOTING12.1.1 Servicing freezer 12.1.2 Reasons of electricity leakage of freezerMaintenance Service and Trouble Shooting MAINTENANCE SERVICE AND TROUBLE SHOOTINGIf electricity leakage occurs outside the compressor, please use MAINTENANCE SERVICE AND TROUBLE SHOOTING 12.1.3 Troubleshooting observationMaintenance Service and Trouble Shooting tetra chloromethane or alcohol to clean it. If the leakage occurs in the inner of compressor, it needs to be changedMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.1.4 Troubleshooting by soundsMaintenance Service and Trouble Shooting 1 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 leakageMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.1.5 troubleshooting by touchMaintenance Service and Trouble Shooting normal 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 compressorMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.1.6 System noise repairMaintenance Service and Trouble Shooting please move your hand over it quickly, otherwise your hand will be stuckMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.1.7 Poor freezing effect analysis and solutionsMaintenance Service and Trouble Shooting 6 If the fan supporter is loose and noise is caused, please tightenMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.1.8 How to handle the seal bar for poor sealingMaintenance Service and Trouble Shooting near 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 reduced12.1.10 How to know there is problem with compressor motor 12.1.9 Why freezer cannot be used at low temperature environmentMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.1.11 Freezer problem analysis and service4. The knob of temperature controller is at ProblemsThe temperature controller is out of position for suitable temperatureThere is mechanical problem in the adjust its value to rated6. Temperature around compressor is too AdjustMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.1.12 Procedure for fan changeMaintenance Service and Trouble Shooting 12.1.13 Procedure for temperature controller change12.2.1 Freezer cannot be started 12.2 Common freezer problemsMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.2.2 Operation of freezer is not normalMaintenance 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 12.4.1 Product characters 12.4 Application and maintenance of freezer12.4.2 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 MAINTENANCE SERVICE AND TROUBLE SHOOTING 12.5Maintenance Service and Trouble Shooting 4 Check the casters and change if there is any damage12.5.2 Notice for use 12.5.1 Freezer repair tool and equipmentMAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble ShootingMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.5.3 Procedure for filling equipmentMaintenance Service and Trouble Shooting 12.6.1 Freezer noise sources 12.6 Freezer noise12.6.2 Compressor MAINTENANCE SERVICE AND TROUBLE SHOOTING3 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 12.6.8 How to reduce freezer’s noise? 12.6.7 Why freezer’s noise increases after stop use for sometime?12.6.9 why freezer noise changes greater at night? sometime?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 MAINTENANCE SERVICE AND TROUBLE SHOOTING 12.8Measuring technology of freezer performance parameterMaintenance Service and Trouble Shooting 12.8.1 Measuring contentMAINTENANCE SERVICE AND TROUBLE SHOOTING 12.8.2 Test method and instrumentMaintenance Service and Trouble Shooting 12.8.2.1 Sealing performance test of refrigeration systemMaintenance Service and Trouble Shooting MAINTENANCE SERVICE AND TROUBLE SHOOTING12.8.2.4 Ground resistor 12.8.2.5 Leakage of currentMaintenance 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