As we all know, the length and inner diameter of the capillary are related to the working efficiency of the whole machine. The choice of capillary length determines the cooling capacity. Different brands and different types of high and low temperature test chambers, the length and inner diameter of the capillary are different, can you repair the capillary of the original machine without replacing the capillary? The answer is yes. The following are the specific steps.

First, you must first find the exit position of the capillary

The exit position of the high and low temperature test chamber capillary is generally in the foam layer in the upper middle portion of the back of the case. When replacing the high and low temperature test chamber evaporator, it is necessary to dig up the back insulation material and bury the connection pipe and the return pipe of the test box. When digging the insulation layer, dig up along the return pipe until the outlet of the capillary is dug. The capillaries of the original machine are generally installed in the return air pipe. There must be two tubes of Φ6 or Φ8 at the outlet of the capillary. The capillary is welded from the inlet of the original evaporator, connected to the inlet of the new evaporator, and then foamed and restored according to the conventional method.

For high and low temperature tanks inside the evaporator, do not rush to replace the evaporator (coil). If it is a micro-leakage, after reducing the various pipes, inject a small amount of refrigerant, start the compressor for ten minutes, carefully observe the position of the first frost in the freezing chamber, and mark it. If the leak is very fast, you can find a test box of the same brand model, observe the position of the first frosting in the power-on state, and then determine the exit position according to the position, because the internal piping of the same brand test box is not arranged. There will be too many discrepancies. In the first frosting area, use a utility knife to gently draw a "7" shaped mouth, take out the outlet of the capillary, and connect it to the inlet of the new evaporator. For the drawn hole, you can stick it with double tube glue. prison.

Second, with the original compressor compressor reverse blow capillary

The refrigeration equipment treated by this method can not adjust the length of the capillary as long as the capillary is unobstructed. Because the length of the original capillary is determined by a rigorous calculation test, it is in an optimal state, so the test time can be shortened and the waste of refrigerant can be reduced. However, care should be taken to ensure that the capillary is not blocked, otherwise it will be blocked with air pressure.

The capillary turns (the inlet becomes the outlet and the outlet becomes the inlet) is welded to the filter, the low pressure end of the compressor is opened, the compressor is started, and the compressed air is used to blow it in the opposite direction. For a capillary that is severely blocked, it can be heated by a gas torch, the dirt is burned, and then it is discharged by air pressure. If the conditions permit, it can be blown in the opposite direction with nitrogen gas, and then washed with about 100 ml of nitrogen tetrachloride for better effect.

The purpose of blowing in the opposite direction of the capillary is that the dirt is generally not far from the inlet of the capillary. If the blowing is performed in the direction of the flow of the refrigerant, dirt (impurities) will be blown into the middle of the capillary, resulting in tighter impurities. Can't be excluded.

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