Split System Lineset Sizing

Determine correct refrigerant line sizes for split system installations

Nominal cooling capacity of the system in tons. 1 ton = 12,000 BTU/hr.
tons
Total equivalent length of refrigerant piping from outdoor to indoor unit, including fittings.
ft
Vertical height difference between indoor and outdoor units. Positive = indoor unit is higher.
ft
R-410A is most common for residential. R-32 is newer high-efficiency. R-22 is legacy/phase-out.

Results

Suction Line ODinches
Liquid Line ODinches
Max Allowable Lengthft
Oil Return
Additional Chargeoz
References: Manufacturer lineset sizing charts, ACCA Manual D. Additional refrigerant charge typically required for linesets exceeding 25 ft. Oil return traps needed for vertical rises over 20 ft.