AirStage ABUA24RLAV Manuale di installazione - Pagina 7

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Dimension A [in. (mm)]
Pipe outside diameter
Flare tool for R410A,
[in. (mm)]
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
0 to 0.020 (0 to 0.5)
5/8 (15.88)
3/4 (19.05)
When using conventional (R22) fl are tools to fl are R410A pipes, the dimension A should
be approximately 0.020 in. (0.5 mm) more than indicated in the table (for fl aring with
R410A fl are tools) to achieve the specifi ed fl aring. Use a thickness gauge to measure the
dimension A. It is recommended that a R410A fl aring tool is used.
Pipe outside diameter
Width across
fl ats
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
4.3.2. Bending pipes
•
The pipes are shaped by your hands or pipe bender. Be careful not to collapse them.
•
Do not bend the pipes in an angle more than 90°.
•
When pipes are repeatedly bend or stretched, the material will harden, making it diffi cult
to bend or stretch them any more. Do not bend or stretch the pipes more than 3 times.
To prevent breaking of the pipe, avoid sharp bends.
If the pipe is bent repeatedly at the same place, it will break.
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 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 tightened smoothly. If the
fl are nut is forced to turn, the threads will be damaged.
Do not remove the flare nut from the indoor unit pipe until immediately before
connecting the connection pipe.
Do not use mineral oil on fl ared 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.
Dimension B
[in. (mm)]
clutch type
11/32 (9.1)
17/32 (13.2)
21/32 (16.6)
25/32 (19.7)
15/16 (24.0)
Width across flats of Flare
[in. (mm)]
nut [in. (mm)]
1/4 (6.35)
21/32 (17)
3/8 (9.52)
7/8 (22)
1-1/32 (26)
1-5/32 (29)
1-13/32 (36)
CAUTION
Silencer pipe
(Accessories)
CAUTION
Silencer pipe
(Accessories)
0 (0)
-0.015 (-0.4)
Hold the torque wrench at its grip, keeping it at a right angle with the pipe, in order to
tighten the fl are nut correctly.
Tighten the fl are nuts with a torque wrench using the specifi ed tightening method.
Otherwise, the fl are nuts could break after a prolonged period, causing refrigerant to
leak and generate hazardous gas if the refrigerant comes into contact with a fl ame.
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 [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.
] 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).
No gap
Coupler heat
insulator
(Accessories)
Silencer pipe
Insulation (pipe)
(Accessories)
There should be no gaps between the insulation and the unit.
CAUTION
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Tightening torque [lbf·ft. (N·m)]
11.8 to 13.3 (16 to 18)
23.6 to 31.0 (32 to 42)
36.1 to 45.0 (49 to 61)
46.5 to 55.3 (63 to 75)
66.4 to 81.1 (90 to 110)
CAUTION
Indoor unit
Coupler heat
insulator
(Accessories)
Be sure to overlap
the insulation
Gas pipe Liquid pipe
No gap
Coupler heat
insulation
Small pipe
CAUTION
No gap
En-6