Owner's Manual

Flex + Series
10
6.2 Dimension of Connecting Pipe
Table 4
Sorts
Gas Pipe
（mm/inch）
Liquid Pipe
（mm/inch）
Outdoor unit
ISMO-6021
Φ15.9(5/8) Φ9.52(3/8)
Between outdoor unit and the
1st branch
The pipe L1 Φ19.05(3/4) Φ9.52(3/8)
Between the 1st and the 2nd
branch
The pipe L2 Φ15.9(5/8) Φ9.52(3/8)
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) FQ01A/A (Gas pipe)
Fig. 9
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 the
copper tube in the middle with tube cutter and clear up burrs. Please do that as following figure.
Fig. 10
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.
Fig. 11