Fig. 16
(2) Y-type branch has several pipe sections with different dimension, which facilitates to
match with various copper pipes. Use pipe cutter to cut in the middle of the pipe section that is of
proper dimension and remove burrs as well. See Fig. 17.
(3) Y-type branch must be installed vertically or horizontally.
Branch shall be isolated by insulating material that can bear 120℃(248℉)or even higher temperature. The
attached foam of branch cannot be taken as insulating material.
4.3.6 Thermal Insulation for Pipeline
(1) For multi VRF system, every copper pipe should be labeled so as to avoid
misconnection.
(2) At the branch inlet, leave at least 500mm(19-3/4inch) straight pipe section.
(3) Thermal insulation for pipeline
1) To avoid condensate or water leakage on the connection pipe, the gas pipe and liquid
pipe must be wrapped with thermal insulating material and adhesive tape for insulation
from the air.
3) Joints of indoor and outdoor unit should be wrapped with insulating material and leave
no gap between pipe and wall. See Fig. 18.
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