Photovoltaic Multi VRF
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4.3.6 Installation of Y-type Branch
(1) Y-type Branch
(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.
(3) Y-type branch must be installed vertically or horizontally.
(4) Branch shall be isolated by insulating material that can bear 120°or even higher
temperature. The attached foam of branch cannot be taken as insulating material.
4.3.7 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 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.
2) Thermal insulating material shall be able bear the pipe temperature. For heat pump
unit, liquid pipe should bear 70℃ or above and gas pipe should bear 120℃ or
above. For cooling only unit, both liquid pipe and gas pipe should bear 70℃ or
above.
3) Example: Polyethylene foam (bear 120℃ or above); foaming polyethylene (bear
100℃ or above)
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