Installation Manual

En-13
English
5.2. Selecting the pipe material
WARNING
Be sure to perform fl are connection. It causes a malfunction and a fi re of this unit when connecting the pipes other than
fl are connection (brazing etc.).
CAUTION
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.
5.3.1. Flaring
(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, or the conventional
fl are tool.
(4) Protect the pipes by pinching them or with tape to
prevent dust, dirt, or water from entering the pipes.
Pipe
Die
A
B
Check if [L] is fl ared
uniformly and is not
cracked or scratched.
Pipe outside
diameter
[mm(in.)]
Dimension A [mm(in.)]
Dimension B
[mm(in.)]
Flare tool for R410A,
clutch type
6.35 (1/4)
0 to 0.5
(0 to 0.02)
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)
When using conventional fl are tools to fl are R410A pipes,
the dimension A should be approximately 0.5 mm (0.02 in.)
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.
Width
across
fl ats
Pipe outside diameter
[mm(in.)]
Width across fl ats 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)
Copper pipes
It is necessary to use seamless copper pipes and it is
desirable that the amount of residual oil is less than
40 mg/10 m (0.004 oz/100 ft). Do not use copper pipes
having a collapsed, deformed or discolored portion
(especially on the interior surface). Otherwise, the
expansion valve or capillary tube may become blocked
with contaminants.
As an air conditioner using R410A incurs pressure higher
than when using conventional refrigerant (R22), it is
necessary to choose adequate materials.
Thicknesses of copper pipes used with R410A are as
shown in the table. Never use copper pipes thinner than
that in the table even when it is available on the market.
Thicknesses of Annealed Copper Pipes (R410A)
Pipe outside diameter
[mm(in.)]
Thickness
[mm(in.)]
6.35 (1/4) 0.80 (0.032)
9.52 (3/8) 0.80 (0.032)
12.70 (1/2) 0.80 (0.032)
15.88 (5/8) 1.00 (0.039)
19.05 (3/4) 1.20 (0.047)
5.3. Flare connection (Pipe connection)
0
-0.4
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