Have a 55t rtu with 2 circuits. Each has 2-14t scrolls with 1 txv on each circuit. I noticed on the 2nd circuit when only one compressor starts my txv hunts and the sight glass flashes then goes full. Once the 2nd compressor starts all is normal. Is this due to a 28t txv trying to feed the evap with a 14t comp.? I also noticed my superheat gets to the point where liquid may be returning. I have no IOM's for this unit. As far as circuit 1 I don't know if it is doing the same thing. Does anyone know if this unit is designed to allow only 1 compressor to run on each circuit? From what I can tell both comp's on each circuit run together and are staged thru a time delay.