Connection Of Branch Pipe; Design Requirements For Oil Trap - Gree GWHD(48S)NM3CO Service Manual

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6.3 Connection of Branch Pipe

1) If two or three BU modules used, Y-type branch pipe of FQ01A/A will be chosen.
FQ01A/A (Liquid pipe)
2) Y-type branch pipe is equipped with auxiliary tubes to adjust the diameter of different pipes. If the
dimension of the pipe selected is different from the dimension of branch pipe joint, Cut
in the middle with tube cutter and clear up burrs.
3) Y-type branch pipe must be installed in vertical or horizontal direction. In the inlet of the branch pipe,
keep at least 500mm straight pipe.

6.4 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.
Follow below for details on installation and fabrication of oil trap.
① The oil trap may be fabricated into U-type or return-type.
② If outdoor unit is below indoor unit, it is not needed to install oil trap on the vertical pipe of gas piping.
③ 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:
④ Fabrication dimension of oil trap is as shown below:
INSTALLATION 98
FQ01A/A (Gas pipe)
Please do that as following figure.
the copper tube