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7
Refrigerant piping connection
7.3 Instructions for connecting piping to indoor unit
1. Align the center of the two pipes that you will connect. See Fig. 7.7.
Indoor unit tubing
2. Tighten the flare nut as tightly as possible by hand.
3. Using a spanner, grip the nut on the unit tubing.
4. While firmly gripping the nut on the unit tubing, use a torque wrench to tighten the flare nut
according to the torque values in the Torque Requirements table below. Loosen the flaring nut
slightly, then tighten again.
Outer diameter of pipe (mm)
Ø 6.35 (Ø 0.25")
Ø 9.52 (Ø 0.375")
Ø 12.7 ( Ø 0.5")
Ø 16 ( Ø 0.63")
40 / 108 EN
Flare nut
Fig. 7.7
Fig. 7.8
Torque requirements
Tightening torque (N•cm)
1,500 (11lb • ft)
2,500 (18.4lb • ft)
3,500 (25.8lb • ft)
4,500 (33.19lb • ft)
Split-type room air conditioner / Installation Manual
Pipe
Add. tightening torque (N•m)
1,600 (11.8lb • ft)
2,600 (19.18lb • ft)
3,600 (26.55lb • ft)
4,700 (34.67lb • ft)
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