En-13
A
Check if [L] is flared uniformly
and is not cracked or scratched.
Die
Pipe
Pipe outside
diameter
[mm (in.)]
Dimension A
[mm (in.)]
Dimension B
-
0
0.4
[mm (in.)]
Flare tool for R410A,
clutch type
6.35 (1/4)
0 to 0.5
(0 to 0.020)
9.1 (11/32)
9.52 (3/8)
13.2 (17/32)
12.70 (1/2)
16.6 (21/32)
15.88 (5/8)
19.7 (25/32)
19.05 (3/4)
24.0 (15/16)
When using conventional flare tools to flare R410A pipes,
the dimension A should be approximately 0.5 mm (0.020 in.)
more than indicated in the table (for flaring with R410A flare
tools) to achieve the specified flaring. Use a thickness gauge
to measure the dimension A.
Width across
flats
Width across
flats
Pipe outside
diameter [mm (in.)]
Width across flats
of Flare nut [mm (in.)]
6.35 (1/4)
17 (21/32)
9.52 (3/8)
22 (7/8)
12.70 (1/2)
26 (1-1/32)
15.88 (5/8)
29 (1-5/32)
19.05 (3/4)
36 (1-13/32)
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 difficult 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.
7.3.3. Pipe connection
CAUTION
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 flare 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 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
flame.
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 flare nut is tightened properly by your hand, hold
the body side coupling with wrench, then tighten with a torque
wrench. (See the table below for the flare nut tightening
torques.)
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [mm (in.)]
Tightening torque [N·m (lbf·ft)]
6.35 (1/4) dia.
16 to 18 (11.8 to 13.3)
9.52 (3/8) dia.
32 to 42 (23.6 to 31.0)
12.70 (1/2) dia.
49 to 61 (36.1 to 45.0)
15.88 (5/8) dia.
63 to 75 (46.5 to 55.3)
19.05 (3/4) dia.
90 to 110 (66.4 to 81.1)
7.4. Installing heat insulation
Install the heat insulation material after performing a
refrigerant 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 affixing the coupler heat insulation, secure it with 2
binders (large), one on each end of the insulation.
• Make sure that the binders overlap the heat insulation
pipe.
Coupler heat
insulation
(Accessories)
Cover this portion with
heat insulation.
Binder (Large)
(Accessories)
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.
