Pipe Connection - Fujitsu AU*G36LRLA Design & Technical Manual

BENDING PIPES
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• To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of
100 mm to 150 mm.
• If the pipe is bent repeatedly at the same place, it will break.
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes at an angle of more than 90°.
• When pipes are repeatedly bent or stretched, the material will harden, making it difficult to bend
or stretch them any more.
• Do not bend or stretch the pipes more than three times.

PIPE CONNECTION

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• Be sure to install the pipe against the port on the indoor unit and the outdoor unit correctly. If
the centering is improper, the flare nut cannot be tightened smoothly. If the flare nut is forced to
turn, the threads will be damaged.
• Do not remove the flare nut from the outdoor unit pipe until immediately before connecting the
connection pipe.
• After installing the piping, make sure that the connection pipes do not touch the compressor
or outer panel. If the pipes touch the compressor or outer panel, they will vibrate and produce
noise.
(1) Detach the caps and plugs from the pipes.
(2) Center the pipe against the port on the outdoor unit, and then turn the flare nut by hand.
(3) Tighten the flare nut of the connection pipe at the outdoor unit valve connector.
3-way valve (Liquid)
Flare nut
Connection pipe
(Liquid)
(4) After tightening the flare nut by hand, use a torque wrench to fully tighten it.
• Hold the torque wrench at its grip, keeping it in a right angle with the pipe, in order to tighten the
flare nut correctly.
• Outer panel may be distorted if fastened only with a wrench. Be sure to fix the elementary part
with a spanner and fasten with a wrench (refer to below diagram).
• Do not apply force to the blank cap of the valve or hang a wrench, etc., on the cap. It may cause
leakage of refrigerant.
Blank cap
Holding
wrench
3-way valve (Gas)
Flare nut
Connection pipe (Gas)
Flare nut [mm (in.)]
Flare nut
Torque
wrench
12.70 (1/2) dia.
90°
15.88 (5/8) dia.
19.05 (3/4) dia.
Torque wrench
CAUTION
CAUTION
CAUTION
Tightening torque [N·m (kgf·cm)]
6.35 (1/4) dia.
9.52 (3/8) dia.
- (05-15) -
16 to 18 (160 to 180)
32 to 42 (320 to 420)
49 to 61 (490 to 610)
63 to 75 (630 to 750)
90 to 110 (900 to 1100)