Gree GMV-72WM/B-U Owner's Manual page 26

GMV DC Inverter VRF
(4) Manifold is isolated by insulating material that can bear 120ºC(248°F)or higher temperature.
Manifold attached foam cannot be taken as insulating material.
4.4.3 Installation and thermal insulation for pipeline
(1) For multi VRF system, every copper pipe should be labelled 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 (19-11/16inch).
The length of a straight pipe before the main pipe port of the manifold cannot be less than 500mm
(19-11/16inch). The length of a straight pipe between the branch of the manifold and the IDU cannot
be less than 500mm(19-11/16inch). See Fig.4.4.5.
Fig.4.4.4(b)
Fig.4.4.5
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Unit: mm(inch)