Abstract: Adopting the method of laboratory simulation test analysis and after-sales field actual verification, through a typical case of after-sales condensation water leakage of a frequency conversion multi split, it is analyzed that the return oil will lead to the condensation water leakage of the internal machine which is not opened in the multi split system. The condensation problem can be solved by increasing the oil return period and increasing the wind speed. Concurrently, analyzing the impact of the standardization of after-sales installation and user's use environment on condensation, which provides a relatively comprehensive solution for the condensation water leakage problem of frequency conversion multi split.

Key words: Multi-line, Condensate water leakage, Oil recovery, Installation, Use environment