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Cooling and Heating Recovery Mode Exchanger
4.2.4 Selection of Y-type branch
If connect outdoor unit to multiple mode exchanger, the Y-type branch should be adopted.
(1) Y-type branch
(2) Y-type branch has several pipe sections with different size, which facilitates to match with
various copper pipes. Use pipe cutter to cut in the middle of the pipe section that is of proper size
and remove burrs as well. See the following figure.
(3) Y-type branch must be installed vertically or horizontally.
(4) Branch shall be insulated by insulating material that can bear 120℃(248℉) or even higher
temperature. The attached foam of branch cannot be taken as insulating material.
4.2.5 Thermal insulation for pipeline
(1) For multi VRF system, every copper pipe should be labeled so as to avoid misconnection.
(2) Manifolds can be laid in the following ways:
The length of a straight pipe between two manifolds cannot be less than 500 mm (19-11/16in.).
The length of a straight pipe before the main pipe port of the manifold cannot be less than 500mm
(19-11/16in.). The length of a straight pipe between the branch of the manifold and the IDU
cannot be less than 500mm(19-11/16in.). See Fig.4.24.
Fig. 4.22
Fig. 4.23
17
Unit: mm(in.)
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