No frost fin evaporator Key Quality Control: Inner cleanness, washed 1st time, to get rid ofinner impurity etc, leakage testing Then anodized evaporator to make one anodizing film onsurface of evaporator to increase its corrosion resistance, and wash again. 0.1~0.15Mpa inner Nitrogen gas pressure Rust free liquid on end tubes, finally check leakage. Pressure keeping 1.Check dewell needle head with leakage ornot, the deweel gun with leakage or not. 2. Adjust pressure adjust valve, to make exitpressure within 0.6~0.8Mpa 3. Check dewell time: insert dewell needleinside cap, after pressure keeping test pressure within 0.1~0.15MPa withoutchange; if not qualified then need to adjust dewell time till good. (dewelltime: about 8s) 4. For internal installed cap, insert dewellneedle into tube, turn on swith, the dewell indication light onset; and dewellindication light off when dewell time arrives. 5.  For external installed cap, the cap shallinsert 1/5 depth, dewell needle insert inside tube from 1/3 place of cap side,dewell to 0.1~0.15MPa, then pull needle and then press cap to inner tubeuickly. Enclosure cap leakage test: 1.Cup with 2/3 rust free liquid 2. Put the cap inside liquid over 3s, checkthere is air bubble or not; if cap hole or needle hole has air buble, then needto shake evaporator or clean it and re-test, if there is no air bubble, it isqualified piece; if it still has air bubble, then needs to take it out toreplace cap and re-make pressure keeping leakage test.