Fujitsu Airstage J-II Series Design & Technical Manual page 593

„ PIPE CONNECTION
„
● 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.
(4) After tightening the flare nut by hand, use a torque wrench to fully tighten it.
3-way valve
(Liquid)
Flare nut
Connection pipe
(Liquid)
● 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
Flare nut
[in. (mm)]
1/4 (6.35) dia.
3/8 (9.52) dia.
1/2 (12.70) dia.
5/8 (15.88) dia.
3/4 (19.05) dia.
CAUTION
3-way valve
(Gas)
Flare nut
Connection pipe
(Gas)
CAUTION
Flare nut
Torque wrench
90°
Torque wrench
Tightening torque
[N·m]
16 to 18
32 to 42
49 to 61
63 to 75
90 to 110
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