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Outside Unit
Refrigerant piping system
Indoor unit connection
‘
Indoor unit connecting pipe from branch (a~f)
Indoor unit capacity [kW(Btu/h)]
≤ 5.6(19,100)
< 16.0(54,600)
≤ 22.4(76,400)
< 33(112,600)
Ø6.35(1/4)
Ø9.52(3/8)
Ø9.52(3/8)
Ø9.52(3/8)
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
Oil trap application method between outside units
• Because of the possibility of oil being accumulated in the outside unit that has stopped, when there is a height differ-
ence between outside unit pipes or if the pipe distance between the outside units is over 2m, you must always apply
an oil trap. (But, the oil trap between outside units is limited to 1 time and is only applied to the gas pipe.)
• If the pipe distance between the outside units is 2m or below, and if the location of the main pipe is lower than that of
the outside unit and if the location of the main pipe is lower than that of the outside unit, the oil trap does not have to
be applied.
• If the location of the main pipe is higher than the location of the outside unit, be careful since the oil can be accumu-
lated in the stopped outside unit.
• If there is high/low difference between the outside unit pipes, oil can be accumulated to the outside unit on the lower
location until the unit stops.
WARNING
• It is recommended to install the difference between the length of the pipe after header branch(a~f) and the
length of the pipe connected to indoor unit to be the minimum.
• As the pipe length difference increases, there may be performance differences between indoor units.
• Y branch and header branch cannot be used after header branch.
u
Cautions for header branch pipe
MFL67705803 2018. 9. 17. 오오 12:58 Page 28
