Owner's Manual

Flex + Series
12
wrench should be perpendicular to the refrigerant pipeline).
④ The following table for the torque required to tighten the nuts.
Table 5
Pipe
diameter
(mm/inch)
Thickness of
copper
tube(mm/inch)
Tightening
torque
(N·m/1bf·ft)
Φ6.35(1/4) ≥0.8(1/32) 15～30(11~22)
Φ9.52(3/8) ≥0.8(1/32) 35～40(26~29)
Φ12.7(1/2) ≥0.8(1/32) 45～50(33~37)
Φ15.9(5/8) ≥1.0(1/25) 60～65(44~48)
Φ19.05(3/4) ≥1.0(1/25) 70～75(52~55)
Fig. 14
CAUTION
1) During the connection of the indoor unit and BU module to the refrigerant pipe, never pull any joints of
the indoor unit and the BU module by force; otherwise the capillary pipe or other pipe may crack,
which then would result in leakage.
2) The refrigerant pipe should be supported by brackets, that is, don’t let the unit withstand the weight of
it.
3) For the Flex + Series, each pipe should be labeled to tell which system it belongs to avoid
mistaken inaccurate piping.
6.5 Connection of Refrigerant Pipe