OEM Manual – CUBO
2
SMART
Pag. 9
5 Piping details
5.1 Pipe Connections (Multi-Split)
The recommended connection between the Condensing Unit and more remote evaporators is the same
one used for Multi-Split system.
Basically the system requires a dedicated suction line for each evaporator that will be collected by a
manifold installed close to the condensing unit. Please refer to the example reported in the below picture.
PRO: good compromise solution between oil return and pressure drop issue can be found.
CONS: higher copper pipe usage but with smaller diameters, easier installation.
The collector must be properly sized and installed in a horizontal position
SCM Frigo recommends connection with up to 3 remote evaporators, and
maximum suction pipe length of 20 meters to each evaporator.
Liquid line must be properly sized to supply the farther evaporators (liquid velocity < 1 m/s is
suggested). Suction line must be properly sized to have a good oil return with a low pressure
drop (gas velocity from 8 to 16 m/s are suggested).
5.2 Oil traps
If UMTT and evaporator are installed at different heights, it is necessary to create piping oil traps.
The installation of an oil-trap is recommended (one oil-trap every 2/3 meters of difference in
height)
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