Fujitsu AUXG22KVLA Design & Technical Manual page 113

¢ Connecting the pipes
CAUTION
• Be sure to install the pipe against the port on the indoor unit and the outdoor unit correctly. If the
centering is improper, the fl are nut cannot be tightened smoothly. If the fl are nut is forced to
turn, the threads will be damaged.
• Do not remove the fl are 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 fl are nut by hand.
3. Tighten the fl are nut of the connection pipe at the outdoor unit valve connector.
4. After tightening the fl are nut by hand, use a torque wrench to fully tighten it.
CAUTION
• Hold the torque wrench at its grip, keeping it in a right angle with the pipe, in order to tighten the
fl are nut correctly.
• Fasten a fl are nut with a torque wrench as instructed in this manual. If fastened too tight, the fl
are nut may be broken after a long period of time and cause a leakage of refrigerant.
• 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 the following figure.)
• 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.
3-3. Pipe connection
3-way valve (Liquid)
Flare nut
Connection pipe
(Liquid)
Holding
wrench
To prevent gas leakage, coat the
are surface with refrigerator oil.
- 105 -
3-way valve (Gas)
Flare nut
Connection pipe
(Gas)
Flare nut
Torque
90°
wrench
Torque wrench
3. Pipe installation