Methods and systems for lubricating a transport climate control system having an auxiliary sump

A climate control system for a transport unit, the climate control system comprising:

• a compressor, the compressor comprising:
• a compressor housing;
• a compressor element provided in the compressor housing for compressing a working fluid;
• a lubricant circuit, wherein the lubricant circuit comprises a lubricant sump provided in the compressor housing for storing a lubricant, wherein the lubricant is provided for lubricating moving parts of the compressor;
• and
• an auxiliary sump in fluid communication with the lubricant sump, wherein the auxiliary sump is configured such that the lubricant flows by gravity between the auxiliary sump and the lubricant sump,
• wherein the auxiliary sump is provided externally of the compressor housing and is in fluid communication with the lubricant sump via a pipe, wherein the pipe has a vapor space configured such that a vapor space of the auxiliary sump is connected to a vapor space of the lubricant sump,
• wherein the auxiliary sump is a dead-end system such that the auxiliary sump is only in fluid communication with the lubricant sump.