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

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Dimensions (mm)

Mass (g)

Note

 

Small

25×50×100

125

In the geometrical center of 5oog

 

 

Middle

50×100×100

500

pack, there is a thermal element;

 

Big

50×100×200

1000

this pack is called M pack.

 

 

 

 

 

 

The contents of test packs are (take 1000g pack as the datum): hydroxyethlmethylcellulose 230g; water 764.2g; sodium chloride 5g; parachlorometacresol 0.8g. The freezing point of filling of pack is -1, its thermal property is similar to lean beef.

(5)Temperature measuring gauge: The measuring of temperature normally use platinum resistor. There are two types:

Put the platinum resistor directly into test pack (M pack) when measuring

a. Its temperature;

b.Insert the platinum resistor into the center of four tin electroplated copper columns, the diameter and height of column is the same 15.2mm.

The measuring equipment is temperature-measuring bridge with the accuracy of +-0.3K.

MAINTENANCE SERVICE AND TROUBLE SHOOTING

Maintenance Service and Trouble Shooting

(6)Humidity measuring instrument: the measurement of relative humidity is wet and dry bulb method. Put the dry bulb thermometer and wet bulb thermometer (enclose 1.5-2 layers of degreased gauze at the temperature

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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%