Attached below are standard HVAC Industry guides for R410a Heat Pumps. Use these at the discretion of the HVAC technician making the application decisions. Small SunPumps can have line length restrictions below 40 feet, with mid and large units under 60 feet total one-way including vertical rise and horizontal run.
The common issues to consider are managing the R410a lubricating oil, often with a p-trap, and possibly using a booster pump in combination with a larger diameter line set in some cases. SunPump recommends installers consult with an appropriate and experienced HVAC Engineer if the lengths are near 100 feet or over to avoid performance consequences.