A 2 stage commercial condenser unit is very common , one of our guys was wiring one up earlier today .
This was straight A/C , not a HP .
Two sets of refrigeration lines . C , R , G , W1 , W2 , Y1 , Y2 for controls .
We have an inverter drive 12,000 BTU ductless mini split HP in our bedroom . We love it . MS's are very quiet . Also , a traditional MS in the living room .
I think inverter drive is slowly working its way into the residential & commercial traditional split systems .
Wiring a VFD would not be that difficult , more a matter of the controls .
Best wishes, :-)
Wyr
God bless
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