17 Series Mini-Split
Refrigerant Piping at the Outdoor Unit
Tighten the fl are nut of the connection pipe at the outdoor unit valve connector. Follow the fl are
nut guidelines in this manual.
Torque Reference Table
Pipe Diameter in. (mm) Tube Thickness in. (mm) Tightening Torque
1/4" (6.35) ≥ 0.03 (0.8)
11.25 - 14.75 lb•ft (15 ~ 20 N•m)
3/8" (9.52) ≥ 0.03 (0.8)
22.25 - 29.50 lb•ft (30 ~ 40 N•m)
1/2" (12.7) ≥ 0.03 (0.8)
33.25 - 40.50 lb•ft (45 ~ 55 N•m)
5/8" (15.9) ≥ 0.04 (1.0)
44.25 - 47.75 lb•ft (60 ~ 65 N•m)
NOTICE
1. To prevent distortion and breaking of the pipe, bend the pipe with a radius of curvature of 6 in.
(150 mm) or more. Use a tubing bender when forming the copper tubing into a bend.
2. If the pipe is bent repeatedly at the same place, it will break.
Caution
Connect the gas pipe after connecting the liquid pipe completely.
Insulating the Refrigerant Piping and Connections
1. The refrigerant pipes should be insulated and wrapped with appropriate insulating material
and wrapping tape. Each interconnecting refrigeration line must be insulated individually
between the indoor and outdoor unit. The insulation must meet or exceed adopted codes
and standards from the AHJ. Additionally, the insulation joints and seams must be sealed.
Doing so will reduce external condensation formation and serve to prevent water leakage thus
reducing or eliminating water from leaking on building materials from the refrigeration lines.
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