2。 In the maintenance of the coil, the tube is not well attached to the inner wall, resulting in a small evaporation area and poor evaporation.

The corresponding measures are:

1。 Choose a capillary tube with a suitable length (the experience is as follows: open the compressor process port, suck air, weld a pressure gauge on the high pressure side, connect the capillary tube to the ground, and the other end of the capillary tube is open. Turn on the compressor and check the pressure. By gradually shortening the capillary, the gauge pressure is maintained at 1 1- 12kg, which is a capillary with an appropriate length. )

2。 Improve by setting and pasting thick aluminum tape.