1. The oil separator should be installed in the semi-sealed or fully-closed compressor, and an appropriate amount of oil should be added to the oil. When the evaporation temperature is lower than -15 degrees, a gas-liquid separator should be installed and an appropriate amount of refrigeration oil should be installed.

2. The base of the compressor should be equipped with a damping rubber seat.

3, the installation of the unit should have maintenance space, easy to observe the adjustment of the instrument and valve.

4. The high pressure gauge should be installed at the three-way of the liquid storage valve.

5. The overall layout of the unit is reasonable and the colors are consistent. The installation structure of each type of unit should be consistent.