Installing Heat Insulation - Fujitsu ABYA12-24LBTH Installation Manual

4.3.3. Pipe connection
Connect the silencer pipe to the small (liquid) pipe.
Centering the pipe against port on the indoor unit, turn the
fl are nut with your hand.
Be sure that the small pipe is completely installed before
connecting the large pipe.
Indoor unit side
• Be sure to apply 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 fl are nut from the indoor unit pipe until
immediately before connecting the connection pipe.
• Do not use mineral oil on flared part. Prevent mineral
oil from getting into the system as this would reduce the
lifetime of the units.
If necessary, cut the silencer pipe and use it.
• Hold the torque wrench at its grip, keeping it in the right
angle with the pipe, in order to tighten the flare nut
correctly.
• Tighten the flare nuts with a torque wrench using the
specified tightening method. Otherwise, the flare nuts
could break after a prolonged period, causing refrigerant
to leak and generate a hazardous gas if the refrigerant
comes into contact with a fl ame.
En-8
Silencer pipe
(Accessories)
CAUTION
Silencer pipe
(Accessories)
CAUTION
When the fl are nut is tightened properly by your hand,
hold the body side coupling with a separate spanner, then
tighten with a torque wrench.
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [mm (in.)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
15.88 (5/8) dia.
19.05 (3/4) dia.
] 1

4.4. Installing heat insulation

• After checking for gas leaks (refer to the Installation
Manual of the outdoor unit), perform this section.
• Install heat insulation around both the large (gas) and
small (liquid) pipes. Failure to do so may cause water
leaks.
After checking for gas leaks, insulate by wrapping insulation
around the 2 parts (Gas and Liquid) of the indoor unit
coupling, using the coupler heat insulation.
After installing the coupler heat insulation, wrap both ends
with vinyl tape so that there is no gap.
Secure both ends of the heat insulation material using Binder.
And fi nally fi x connection pipe (Liquid) to connection pipe (Gas)
by rolling vinyl tape over coupler heat insulation (Gas) and
coupler heat insulation (Liquid).
Indoor unit
No gap
Coupler heat
insulator
(Accessories)
Gas pipe Liquid pipe
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Tightening torque [N·m (kgf·cm)]
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 1,100)
CAUTION
Coupler heat
insulator
(Accessories)
Be sure to overlap
the insulation
No gap
Coupler heat
insulation