DC Inverter U-match Series Cassette Type Unit
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(2) Outdoor unit is above the indoor unit.
It’s necessary to add oil return bend and non-return bend at the lowest and
highest position of the vertical pipe, as shown below:
Dimensions for the making of oil return bend are as follows:
A(inch)
B(mm)
C(mm)
Ф3/8
≥20
≤150
Ф1/2
≥26
≤150
Ф5/8
≥33
≤150
2.2.3.2 Pipe Flaring
(1) Cut the connection pipe with a pipe cutter.
(2) The mouth of connection pipe should face downward. Remove burrs with
the cut surface so that the chips do not enter the pipe.
(3) Remove the cut-off valve of outdoor unit and take out the flare nut from
