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Connection of Indoor and Outdoor Unit
4. Design requirements for oil trap
If the height difference 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 high-pressure pipe and low-pressure 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 low
pressure gas piping, but oil trap must be mounted at the lowest place and at the highest place of the
vertical pipe of high pressure 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:
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