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5.
Refrigerant Piping Work
Use the specified non-flammable refrigerant
(R410A) for the outdoor unit in the refrigerant
cycle. Do not charge material other than
R410A into the unit such as hydrocarbon
refrigerants (propane or something similar),
oxygen, flammable gases (acetylene or etc.) or
poisonous gases when installing, maintaining
and moving. These flammables are extremely
dangerous and may cause an explosion, a fire,
and injury.
5.1 Refrigerant Piping
(1) Prepare locally-supplied copper pipes.
(2) Select clean copper tubes making sure there
is no dust or moisture inside the tubes.
Before connecting pipes, blow the inside of
the tubes with nitrogen or dry air, to remove
any dust or foreign materials.
(3) Select the piping size as shown in the tables
below. Furthermore, check for the flare
nut and flaring dimension according to the
following figure and table.
● Joint Selection
When using 1/2H material and the flaring work
is not available. In this instance, use a joint
selected from the chart below.
Minimum Thickness of Joint
Diameter
6.35 (1/4)
9.52 (3/8)
12.7 (1/2)
15.88 (5/8)
19.05 (3/4)
22.2 (7/8)
25.4 (1)
28.58 (1-1/8)
31.75 (1-1/4)
38.1 (1-1/2)
41.28 (1-5/8)
Flare Nut Dimension B
Diameter
6.35 (1/4)
9.52 (3/8)
12.7 (1/2)
15.88 (5/8)
19.05 (3/4)
NOTE:
Do not use a joint other than those specified in
the table above.
mm(inch)
R410A
0.5 (0.020)
0.6 (0.024)
0.7 (0.028)
0.8 (0.031)
0.8 (0.031)
0.9 (0.035)
0.95 (0.037)
1.0 (0.039)
1.1 (0.043)
1.35 (0.053)
1.45 (0.057)
mm(
inch)
Flare Nut
R410A
17 (11/16)
22 (7/8)
26 (1)
29 (1-1/8)
36 (1-7/16)
● Flaring Dimension
Perform the flaring work as shown below.
+ 2
90
o
o
φA
1/64 ~ 1/32R
φd
(T) It is impossible to perform the flaring
work with 1/2H material. In this case,
use an accessory pipe (with a flare).
● Cautions for Refrigerant Pipe Work (Example)
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct
Hole
Hole
Attach a cap
or vinyl tape.
Correct
Incorrect
Rain water can
enter.
Attach a cap
or vinyl bag with
rubber band.
B
9
+0
A
Diameter
-0.4(-0.02)
(ɸd)
R410A
6.35 (1/4)
9.1 (0.36)
9.52 (3/8)
13.2 (0.52)
12.7 (1/2)
16.6 (0.65)
15.88 (5/8)
19.7 (0.78)
19.05 (3/4)
(T)
Do not place the pipe
directly on the ground.
Incorrect
Correct
Attach a cap
or vinyl tape.
inch (mm)
Incorrect
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