En-6
Pipe outside diameter
[in. (mm)]
Dimension A [in. (mm)]
Dimension B
0 (0)
-0.015 (-0.4)
[in. (mm)]
Flare tool for R410A,
clutch type
1/4 (6.35)
0 to 0.020 (0 to 0.5)
11/32 (9.1)
3/8 (9.52)
17/32 (13.2)
1/2 (12.70)
21/32 (16.6)
5/8 (15.88)
25/32 (19.7)
3/4 (19.05)
15/16 (24.0)
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 speci
fi
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
[in. (mm)]
Width across flats of Flare
nut [in. (mm)]
1/4 (6.35)
21/32 (17)
3/8 (9.52)
7/8 (22)
1/2 (12.70)
1-1/32 (26)
5/8 (15.88)
1-5/32 (29)
3/4 (19.05)
1-13/32 (36)
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 dif
fi
cult
•
to bend or stretch them any more. Do not bend or stretch the pipes more than 3 times.
CAUTION
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
Silencer pipe
(Accessories)
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 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.
Silencer pipe
(Accessories)
CAUTION
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 speci
fi
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.
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Tighten with 2 wrenches.
Holding wrench
Flare nut
Flare nut [in. (mm)]
Tightening torque [lbf·ft. (N·m)]
1/4 (6.35) dia.
11.8 to 13.3 (16 to 18)
3/8 (9.52) dia.
23.6 to 31.0 (32 to 42)
1/2 (12.70) dia.
36.1 to 45.0 (49 to 61)
5/8 (15.88) dia.
46.5 to 55.3 (63 to 75)
3/4 (19.05) dia.
66.4 to 81.1 (90 to 110)
]1
4.4. Installing heat insulation
CAUTION
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).
Coupler heat
insulation
Indoor unit
No gap
Coupler heat
insulator
(Accessories)
Coupler heat
insulator
(Accessories)
Be sure to overlap
the insulation
Gas pipe Liquid pipe
No gap
Insulation (pipe)
(Accessories)
No gap
Small pipe
Silencer pipe
CAUTION
There should be no gaps between the insulation and the unit.
Width across
fl
ats
9367701094-02_IM.indb Sec1:6
9367701094-02_IM.indb Sec1:6
12/29/2011 10:50:32 AM
12/29/2011 10:50:32 AM
