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

material of enclosure structure of test room is made up of 10mm thick

polyurethane or polystyrene, which has good insulation. There are air

re-treatment motor sets in the test room. Air comes into the room from

the ceiling of porous plate with uniform pressure, so as to assure

airflow speed in the room not over 0.25m/s and thus keep the room

temperature uniformly.

The temperature of test room is adjustable within the range of 10-43℃.

(2)Temperature requirements for different climate freezers please refer to table 6-1.

Each test point shall keep the stipulated environment temperature, the fluctuation range is +-0.5K. Within the range of 2m heights away from the test platform, the vertical temperature gradient shall not exceed 2K/m.

Table 6-1 Different climate sorts for freezers

Climate types	Symbols	Suitable	Measuring
		temperature (℃)	temperature (℃)
Sub-temperate	SN	10-32	25
zone	N	16-32	25
Temperate zone	ST	18-38	25
Sub-tropical	T	18-43	32
zone
Tropical zone

(3) Environmental humidity: normally the relative humidity is 45-75%.

MAINTENANCE SERVICE AND TROUBLE SHOOTING

Maintenance Service and Trouble Shooting

(3)Test pack: Use the rectangle packs of following dimensions as the load of freezer.

(4)Table 6-2 Test packs for freezer performance

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