Originally Posted by
gskinner
Installing a Luxaire HL20 variable speed compressor heat pump.
Luxaire calls for 3/4" vapor line. Is the 7/8" line going to cause me oil return issues or will I be OK since the compressor is lower then the evaporator. Would normally install new lines but in this case not really possible.
You didn’t specify a tonnage.
I would suggest you get on your favorite search engine and type in- “York piping and application data sheet”.
When the results pop up, select one and look at the page that lists “suction piping capacity reduction chart” for your tonnage. The 2.5 to 4.0 ton units list both 3/4’ and 7/8” suction line and their specs.
Instead of learning the tricks of the trade, learn the trade.