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.
Refrigerant Piping at the Outdoor Unit
Tighten the are nut of the connection pipe at the outdoor unit valve connector. Follow the are
nut guidelines in this manual.
Insulating the Refrigerant Piping and Connections
4. Do not bend the pipe while insulated. First, cut the insulation with a sharp cutting tool and
expose it to the appropriate bend radius, as shown below. After bending the pipe, replace the
insulation and seal it with pipe wrap tape.
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.
2. The connections at the indoor unit should be wrapped with insulating material. No gap is
allowed on the joint of the indoor unit, as shown below.
22 88-M4MHW18-1C-EN
Installer's Guide
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