Haier BD-478A service manual Ground resistor

voltage is 1650V (50Hz) for 2s. At the test, there will not flashover and breakdown occurring.

12.8.2.4 Ground resistor

Check the voltage drop between freezer ground connection point and accessible metal parts, using AC power of load empty voltage not over 12V and 10A current. Calculate the resistance according to the current and voltage drop. Ground connection resistance shall not exceed 0.1 ohm.

12.8.2.5 Leakage of current

When testing, give 1.06 times rated voltage to the freezer, and make the test at operation status. The test complies with GB4706.1-84, the leakage

current testing instrument is made in accordance with the stipulations. The leakage current measured shall not exceed 1.5mA.

12.8.2.6 Noise test

This test is carried out at semi sound eliminating room. The freezer is put to the geometrical center of room, on a 5-10mm thick elastic cushion. The freezer should be empty when testing. Turn the knob of temperature controller to middle or near to strong position and close the door. Test after

the freezer has running more than 30 minutes. The freezer noise power level, 250L and below, ≤52dB(A); 250L above ≤55dB(A)

MAINTENANCE SERVICE AND TROUBLE SHOOTING

Maintenance Service and Trouble Shooting

12.8.2.7 Test method of refrigeration performance

(1) 4 or 6 freezers can be tested simultaneously at the test room. The

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