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Die
A
Pipe
Dimension A [in.
Pipe Outside
Diameter [in.
Flare Tool for R410A,
(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 are tools to are R410A pipes,
the dimension A should be approximately 0.020 in. (0.5 mm)
more than indicated in the table (for aring with R410A are
tools) to achieve the speci ed aring. Use a thickness gauge
to measure the dimension A.
Pipe Outside
Width across
Width across
Diameter [in. (mm)]
ats
flats
7.3.2. 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 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.
7.3.3. Pipe connection
Be sure to install the pipe against the port on the indoor unit
correctly. If the centering is improper, the flare nut cannot
tighten smoothly. If the 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.
Hold the torque wrench at its grip, keeping it at a right angle
with the pipe, in order to tighten the are nut correctly.
Tighten the are nuts with a torque wrench using the speci ed
tightening method. Otherwise, the 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
ame.
9374342419_02_IM.indb 13
Check if [L] is ared uniformly
and is not cracked or scratched.
(mm)]
Dimension B
[in. (mm)]
Clutch Type
3/8 (9.1)
1/2 (13.2)
5/8 (16.6)
3/4 (19.7)
15/16 (24.0)
Width Across Flats of
Flare Nut [in. (mm)]
1/4 (6.35)
11/16 (17)
3/8 (9.52)
7/8 (22)
1/2 (12.70)
1 (26)
5/8 (15.88)
1-1/8 (29)
3/4 (19.05)
1-7/16 (36)
CAUTION
CAUTION
Connect the piping so that the control box cover can easily be
removed for servicing when necessary.
In order to prevent water from leaking into the control box,
make sure that the piping is well insulated.
When the are nut is tightened properly by your hand, hold
the body side coupling with wrench, then tighten with a
torque wrench. (See the following table for the are nut tight-
0
-
0.4
ening torques.)
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.
7.4. Installing heat insulation
Install the heat insulation material after performing a refriger-
ant leak check (see the Installation Manual for the outdoor
unit for details).
7.4.1. COUPLER HEAT INSULATION
• Insulate with the coupler heat insulation (Accessories)
around the gas pipe and liquid pipe at indoor unit.
• After installing the coupler heat insulation, wrap both ends
with vinyl tape so that there is no gap.
• After af xing the coupler heat insulation, secure it with 2
cable ties (large), one on each end of the insulation.
• Make sure that the cable ties overlap the heat insulation
pipe.
Coupler heat
insulation (Acces-
sories)
Cable tie (Large)
(Accessories)
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.
CAUTION
Tighten with 2 wrenches.
Holding spanner
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)
Cover this portion with
heat insulation.
Heat insulation
CAUTION
2015/6/25 10:27:11
En-13
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