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4. 3.
Flare connection (pipe connection)
Tighten the fl are nuts with a torque wrench using the specifi ed tightening method. Oth-
erwise, the fl are 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.
4. 3. 1.
Flaring
Use special fl are tool exclusive for R410A.
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe and remove any burrs.
(3) Insert the fl are nut (always use the fl are nut attached to the indoor and outdoor units
respectively) onto the pipe and perform the fl are processing with a fl are tool. Use the
special R410A fl are tool. Leakage of refrigerant may result if other fl are nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
B
Die
A
Pipe
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)
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 flaring 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.
Width across
Pipe outside diameter
fl ats
[in. (mm)]
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
4.3.2. Bending pipes
•
If pipes are shaped by hand, 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.
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
Be sure to install the pipe against the port on the indoor unit and the outdoor unit cor-
rectly. 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 fl are nut from the indoor unit pipe until immediately before connect-
ing 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.
WARNING
Check if [L] is fl ared uniformly and
is not cracked or scratched.
L
Dimension B
[in. (mm)]
clutch type
11/32 (9.1)
17/32 (13.2)
0 to 0.020
21/32 (16.6)
(0 to 0.5)
25/32 (19.7)
15/16 (24.0)
Width across flats of
Flare nut [in. (mm)]
21/32 (17)
7/8 (22)
1-1/32 (26)
1-5/32 (29)
1-13/32 (36)
CAUTION
CAUTION
(1) Detach the caps and plugs from the pipes.
(2) Center the pipe against the port on the indoor unit, and then turn the fl are nut by
hand.
Connection pipe
(Liquid)
(3) When the fl are nut is tightened properly by your hand, hold the body side coupling
with a separate wrench, then tighten with a torque wrench. (See the table below for
the fl are nut tightening torques.)
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 prolonged period, causing refrigerant to leak
and generate hazardous gas if the refrigerant comes into contact with a fl ame.
0 (0)
-0.015 (-0.4)
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.
4. 4.
Installing heat insulation
After checking for gas leaks (refer to the Installation Manual of the outdoor unit), per-
form 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.
Body
Must fi t tightly against body without any gap.
Connection pipe (Gas)
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
Coupler heat insulation
Be sure to overlap the
insulation
CAUTION
No gap
Coupler heat
insulation
En-6
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