I received a phone call today from an HVAC contractor who was in the process of changing out the compressor in a RTU which was fed with a grounded B phase system. He wanted to know if he could install a 3phase monitor that would prevent his compressor from running on single phase if the unit lost a phase.
I have never had the "pleasure" of working on a grounded B phase system so I didnt' have an answer for him. He said he had changed this compressor out 1.5 years ago and it had already died.
So I started thinking.....would the compressor for this type of electrical system be different from one used on a modern 3phase system ? Could the grounded B phase be the cause of the compressor failing so soon if the compressor wasn't designed for use on a grounded B phase system ?
