Haier BD-478A service manual System noise repair

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please move your hand over it quickly, otherwise your hand will be stuck.

(4)At normal operation of freezer, the temperature of filter dryer cover is similar to room temperature, only a little warmer. If the cover temperature is much higher or lower than that of environment, and there is frost, there must be problem with the refrigeration system.

Touching the above mentioned parts, if there is big temperature difference compared with normal, there must be problem and further decision should be made.

12.1.6 System noise repair

Normally there are two kinds of freezer noise, one is the natural noise of compressor and fan, and the other is the resonance noise or structural noise. The natural noise of compressor and fan is controlled within a standard range, if the range is exceeded, the compressor or fan needs to be repaired or changed. The resonance or structural noise can be handled as follows:

MAINTENANCE SERVICE AND TROUBLE SHOOTING

Maintenance Service and Trouble Shooting

(1)If the freezer is not level, or if the floor is loose, please adjust the base cover or fasten the floor.

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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 Net Dimension 1420*715*810 1690*715*8101420*715*1470 1690*715*1470 ·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 Service procedure Repair equipment RequirementsEvacuation and fill machine is special only for R134a use 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 equipmentFreezer noise sources CompressorFilling 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%