Gree GMV-140WL/A-T User Manual page 17

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. See Fig.17.
(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.
Example: Polyethylene foam (bear 120℃ or above); foaming polyethylene (bear 100℃ or
above)
3) Joints of indoor and outdoor unit should be wrapped with insulating material and leave no
gap between pipe and wall. See Fig.18.
DC Inverter Multi VRF System User Manual
Fig.16
Fig.17
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