102
DC Inverter Multi
VRF Service Manual
4�7 Design requirements for oil trap
If the height different between the indoor unit and outdoor unit exceeds 6m, one oil trap shall be installed every 6m
from lower to upper on the vertical section of gas pipe. The oil trap shall be fabricated into two U-type elbows or one
return-type elbow. The height shall be 3~5 times the piping diameter.
See below for details on installation and fabrication of oil trap.
a. The oil trap may be fabricated into U-type or return-type.
b. If outdoor unit is below indoor unit, it is not needed to install oil trap on the vertical pipe of gas piping.
c. If the outdoor unit is below the indoor unit, it is not needed to install oil trap at the highest or lowest position. If
the outdoor unit is above the indoor unit, oil trap and stop elbow must be installed at the lowest and highest position of the
vertical pipe. See the schematics below:
d. See the schematics below:
Lquid pipe
Gas pipe
Stop elbow
Indoor
unit 1
Indoor
unit 2
Indoor
unit 3
Indoor
unit 4
6m
6m
6m
6m
6m
Oil trap
Outdoor
unit
Outdoor unit lower than indoor unit
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