Haier BD-478A service manual Changing procedure of R134a compressor

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(1)Operation method of repairing equipment (please see instruction manual).

(2)Special requirements

①The time interval from opening of compressor to the beginning of evacuation can not exceed 10 minutes.

②The evacuation time shall not be less than 45 min.

③In case there is leakage of freezer, if leakage occurs at high-pressure end, it is repairable. Please blow high purity N2 before welding. If leakage occurs at low-pressure end, Check system pressure, if the system has no pressure, the freezer has to be scrapped and change with new one, if there is pressure, it is repairable.

12.3.4 Changing procedure of R134a compressor

(1)Switch power off：Open the protection cover by using cross screwdriver or universal

(2)Screwdriver.

(3)Remove electrical parts of compressor.

MAINTENANCE SERVICE AND TROUBLE SHOOTING Maintenance Service and Trouble Shooting

(4) Remove the four mounting bolts of compressor by using fork wrench or

universal tool.

３０

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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*810 1690*715*810 Net Dimension1420*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 Repair equipment Requirements Service procedureEvacuation 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 equipmentCompressor Freezer noise sourcesFilling 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%