GMV5 Compact Series VRF Outdoor Unit
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（3） Manifold should be matched with the fitting pipe of indoor units.（If the distance from the first manifold to a
indoor unit exceeds 30m, then double the gas pipe size between them）
56、63、71、80、90、100、112、125、140 model
4.3 Oil Return Trap Installation
4.3.1 Objective of Setting Oil Loop
When large drop height exists in the system, oil loop is required to be set on the vertical pipeline so as to
guarantee effective oil return to compressor.
4.3.2 Principle of Setting Oil Loop
When large drop height exists between indoor and outdoor units, oil loop is required to be set on the vertical
pipeline for every X m from the top down.
Oil loop can be made by two U-type bends or one return-type bend. Pipe height is 3-5 times of pipe sizes.
(Note: X is determined by the location of indoor and outdoor units, if outdoor unit is upper, then X is 6m, otherwise
X is 10m.)
4.3.3 Precautions for Oil Loop Installation
(1) Oil loop can be set as U-type or O-type;
(2) When the outdoor unit is at lower position, oil loop is required to be set on the vertical pipeline for every 10m
Fitting pipe from indoor
unit to the manifold
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