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ENGLISH
Installation Manual 37
Refrigerant piping system
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 difference between
outside unit pipes or if the pipe distance between the outside units is over 2m(6.6ft), 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(6.6ft) or below, and if the location of the main pipe is lower than that of the out-
side 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 accumulated 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.
High/Low difference
between the outside units
High/Low difference
between outside units pipes
High/Low difference
between outside units pipes
Location of
main pipe
Location of
outside units
Location of main pipe
Location of
main pipe
Location of
main pipe
Location of main pipe
Location of
outside units
Oil trap
Oil trap
Oil trap
2m(6.6ft) or less
2m(6.6ft) or less
2m(6.6ft) or less
Over
0.2m(0.7ft)
Over 2m(6.6ft)
Oil is accumulated on the
outside unit because it can-
not be poured out from the
bottom of the pipe.
Because the oil flow to the right pipe, oil gets accumulated on
the outside unit on the lower side until the outside unit stops.
• When pipe distance between the outside
units is 2m(6.6ft) or less
• Example of incorrect installation
• When pipe distance between the outside
units exceed 2m(6.6ft)
• Example of correct installation
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