Maintenance of Evaporator

- Oct 17, 2017-

1. Often carry out the leak detection work of the evaporator. Leakage is a common fault of the evaporator, in the use of the process should pay attention to frequent leak detection.

Ammonia evaporator leakage, there is a pungent odor, leakage point is not frosting. On the leak can be used Phenolphthalein test paper, because ammonia is alkaline, in the case of Phenolphthalein test red. With the eyes, generally in the evaporator somewhere where frost is usually leaking point, but also in the leakage of soapy water to find leaks.

Freon Evaporator Leakage inspection can use halogen lamp and halogen leak detector, also can be found in soapy water leak. Inspection can be first with the eyes to see if there is oil on the evaporation tube, because freon and oil can be miscible, freon leakage, oil will also seep from the leak point, so where there is oil, where the leak. With halogen lamp leak detection, if there is a freon leakage, halogen lamp burning flame from blue to micro-green, aqua, grass-green, purple, purple, and other colors can judge the amount of freon leakage. If the flames are dark green or purple, the light gas in the flame is poisonous and cannot be inspected for long periods of time. In this case, use soapy water to check the leak point. For trace leaks, the halogen leak detector should be used for leak detection.

2. The frosting condition of the evaporator is often checked. When frost layer is too thick, should defrost in time. When frosting is abnormal, it may be caused by blockage, and should be found in time for reasons and excluded.

3. When the evaporator is stopped for a long time, the refrigerant is humble to the liquid storage device or condenser, so that the pressure of the evaporator is kept at 0.05MPa (gauge pressure) around the appropriate. If the evaporator in the salt pool, also need to rinse water, rinse after the pool filled with tap water.