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５１
temperature with load.
Type tests include items (1), (2), (8), (9), (10), (13), (17), (18), (20), (21) and
the followings: (22) total effective volume; (23) ice producing ability; (24)
frost melting performance; (25) heat insulation performance and anti dew;
(26) gas tightness of door seal; (27) duration of door bar and handle; (28)
strength of supporting bracket and similar parts; (29) internal freezer
material and smell; (30) firmness of freezer and transportation test.
12.8.2 Test method and instrument
12.8.2.1 Sealing performance test of refrigeration system
In this test, freezer is put to positive pressure room, temperature is 16-32℃.
Leakage inspection instrument is set to 0.5g of yearly leakage, check every
position of refrigeration system. Leakage at any point shall not greater than
0.5g. Leakage inspection instrument normally used includes H-25 of
American GE product and Halogen instrument HLD4000 made by a German
company.
12.8.2.2 Insulation resistor
This test is to check the insulation performance of freezer. The resistance is
measured with a voltage of 500V DC added to live parts and accessible
metal parts. The resistance must be not less than 2 million ohm.
MAINTENANCE SERVICE AND TROUBLE SHOOTING
Maintenance Service and Trouble Shooting
12.8.2.3 Electrical intensity
This test is to check the electrical intensity of live parts and all accessible
metal parts. The testing equipment is flashover and breakdown unit,
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