Can you have a scroll compressor run backwards? A co-worker tells me he was an a job where he changed out a three phase scroll and when he turned it on he got no compression-the gauges stayed equalized. He switched two of the legs and it ran fine. Was the rotation backwards? I don't see how. Wouldn't the vanes inside do the same thing even if the motor rotation was reversed? My buddy says there's a spring inside and reversed rotation would make the thing jam (lock rotor in other words). Who's right? Or are we both wrong? What do you guys think?