Haier BD-478A service manual Why the noises of it type freezers are different?, Answer

Page 47

approximate value of sound power level.

The restriction to noise in national standard is more strict and scientific. At present, freezer noise is required to take sound power level stipulated in national standard.

12.6.13 Why the noises of it type freezers are different?

Answer: The noise of each qualified freezer ex-factory is within the range of national standard. Different types of freezers have different powers, compressors used are not the same neither, and so their noises are

different. Even for same type freezers, as the noise of compressors are different, their differences to national standard 52dB(A) are not the same, and the noises are different.

12.6.14Why there are greater noises at starting and stopping of freezer?

Answer:

(1)At the starting of freezer, starting relay will make sound. The acceleration of motor will cause vibration of compressor and makes sound.

MAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shooting

(2)When freezer stops, because of inertial rotation, there will be vibration sound from compressor.

46

PDF created with pdfFactory trial version www.pdffactory.com

Image 47
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 Sometime? Why freezer’s noise increases after stop use for sometime?How to reduce freezer’s noise? Why freezer noise changes greater at night?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%