Haier BD-478A Maintenance Service And Trouble Shooting, Maintenance Service and Trouble Shooting

	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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