Hello, I am a commercial electrician and was wondering about the rotation sensitivity of any type of HVAC equipment. We all know that with any type of equipment that is 3-phase, some motors can be damaged if the phase is backwards... or if any leg of a phase is missing. My question is, do most newer Air Conditioners, Heat Pumps, etc. have an auto shut-off if they detect the phase is backwards or a leg is missing? A few days ago, one of our transformers took a major lighting strike and blew out the A-Phase, well that was over the weekend, we came back to work on Monday and the AC units were acting goofy. The HVAC tech wasn't positive if they had saftey shutoffs on them or not, how funny. I am just wondering since the guy couldn't answer my question.