Superheat for a Marvair 48K wall pack system with a piston?

So what should my target superheat be with a R22 or MO99 system? Marvair compac 1 48K with a piston? I talked to marvair they are telling me 10-12 for superheat and 12-18 for subcooling. I was under the impression w piston was good for 20 degree superheat.

Rookie Asked on June 15, 2018 in Commercial HVAC.
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