Haier BD-478A service manual Maintenance Service and Trouble Shooting

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(1)Leakage of compressor: mainly because of serious vibration, the motor coil of compressor contacts with the shell, the coat of enameled wire will come off some where and connect with shell. Other reasons may be over voltage, insufficient of voltage, adverse circumstances (temperature too high, ventilation and heat radiation to bad) for freezer, thermal protection unit out of order, etc. They will make the motor coil over temperature, insulation material loose, insulation is damaged then electricity will occur.

(2)Leakage of motor connection terminals: the connection terminals of fully enclosed compressor are made from high temperature soda glass sintered ceramics, around the terminals are filled with a high polymer. The terminals and insulation material must have the same linear expansion coefficient, the for requirement between terminals and the shell is more than 0.5 million ohm. The reason of terminal leakage is that soda glass is broken or there are conductive materials such as water, dirt, etc., adhered to terminals.

MAINTENANCE SERVICE AND TROUBLE SHOOTING

Maintenance Service and Trouble Shooting

If electricity leakage occurs outside the compressor, please use

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Contents BD-478A Contents First letter of Freezer in Chinese spelling Product Code Illumination and Series IntroductionFeatures FeaturesBD-388A BD-478A SpecificationsSafety Precautions Safety Precautions 1420*715*1470 1690*715*1470 Net Dimension1420*715*810 1690*715*810 ·Proper Air Circulation Installation and Accessory PartsElectrical Requirement Installation and Accessory Parts Food Storage Basket Defrosting and Draining The FreezerSystem Flow Chart Function Schedule Adjustable temperature dialBrief description of principle about BD-318A/428A Maintenance Service and Trouble ShootingReasons of electricity leakage of freezer Servicing freezerMaintenance Service and Trouble Shooting Maintenance Service and Trouble Shooting Troubleshooting by sounds Troubleshooting by touch System noise repair Poor freezing effect analysis and solutions How to handle the seal bar for poor sealing How to know there is problem with compressor Motor Why freezer cannot be used at low temperature environmentPage Page Procedure for temperature controller change Procedure for fan changeCommon freezer problems Operation of freezer is not normal Evacuation and fill machine is special only for R134a use Service procedureRepair equipment Requirements Changing procedure of R134a compressor Compressor installation and brazing procedures Product characters Application and maintenance of freezerPage Maintenance Safety notice of productStandard procedure of maintenance 12.5 It is not allowed to fill R134a by R12 filling equipment Freezer repair tool and equipment⑧ Switch off motor Procedure for filling equipmentFilling Freezer noise sourcesCompressor Resonance sound of compressor components Gas flowing sound How is the sound of water flowing generated?Why the freezer’s noise increases after using How to reduce freezer’s noise? Why freezer’s noise increases after stop use for sometime?Why freezer noise changes greater at night? Sometime?What are the national stipulations for freezer Noise? Why freezer noise measured at home is incorrect?Page Answer Why the noises of it type freezers are different?How to determine that the sound is noise or Normal? There are stipulations in Items 6.5.7.1 and 6.3.6.1.of GB/T Noise testMaintenance Service and Trouble Shooting 12.8Measuring technology of freezer performance parameter Test method and instrument Temperature with loadGround resistor Maintenance Service and Trouble Shooting Maintenance Service and Trouble Shooting Maintenance Service and Trouble Shooting Exploded View List of Parts QTY BD-388A/478A 392% 600% Lamp switch BD-388A/478A 010% 020%