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5
Refrigerant piping
Optional installation parts
(Locally procured)
Parts name
Refrigerant piping
A
Liquid side: Ø6.4,
Ø9.5 mm
Gas side: Ø12.7,
Ø15.9 mm
Pipe insulating material
B
C
P
t u
, y t
P
V
C
a t
p
e
Refrigerant piping connection
CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Reusable mechanical connectors and flared
joints are not allowed indoors. When mechanical
connectors are reused indoors, sealing parts shall
be renewed.
When flared joints are reused indoors, the flare
part shall be refabricated.
2. T
3. Evacuate the air in the connecting pipes by using
VACUUM PUMP.
4.
Piping connection
Liquid side
Gas side
Model
Outer
Outer
Thickness
diameter
diameter
GM90
Ø9.5
0.8
Ø15.9
25-EN
Flaring
1. Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2. Insert a flare nut into the pipe, and then flare the
pipe.
Q'ty
Use the flare nuts supplied with the air conditioner
or those for R32.
One each
Insert a flare nut into the pipe, and flare the pipe.
Use the flare nuts supplied with the air conditioner
1
or flare nuts for R32 or R410A.
However, the conventional tools can be used by
O
n
e
e
a
c
h
adjusting the projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
Outer dia. of
R32/R410A tool
copper pipe
used
6.4
9.5
0 to 0.5
12.7
15.9
Flaring dia. size: A (Unit: mm)
A
Thickness
1.0
Outer dia. of copper pipe
6
4 .
9
5 .
1
2
7 .
1
5
9 .
* In case of flaring for R32/R410A with the
conventional flare tool, pull the tool out approx.
0.5 mm more than that for R22 to adjust it to the
specified flare size.
The copper pipe gauge is useful for adjusting the
projection margin size.
– 13 –
CAUTION
Do not scratch the inner surface of the flared part
when removing burrs.
Flare processing under the condition of scratches
on the inner surface of flare processing part will
cause refrigerant gas leak.
Check that the flared part is not scratched,
deformed, stepped, or flattened, and that there
are no chips adhered or other problems, after flare
processing.
Do not apply refrigerating machine oil to the flare
surface.
Tightening of connecting part
B
1
Align the centers of the connecting pipes
and fully tighten the fl are nut with your
fi ngers. Then fi x the nut with a wrench as
shown in the fi gure and tighten it with a
torque wrench.
Half union or packed valve
Conventional
tool used
Externally
1.0 to 1.5
threaded side
F
x i
i w
h t
w
e r
2
As shown in the fi gure, be sure to use two
wrenches to loosen or tighten the fl are nut
of the valve on the gas side. If you use a
single crescent, the fl are nut cannot be
tightened to the required tightening torque.
On the other hand, use a single crescent to
loosen or tighten the fl are nut of the valve on
+0
A
–0.4
the liquid side.
9
9 .
1
3
2 .
1
6
6 .
Outer dia. of copper pipe
1
9
7 .
6.4 mm (dia.
9.5 mm (dia.
12.7 mm (dia.
15.9 mm (dia.
Wrench for
fixing
Cap
CAUTION
Do not put the crescent wrench on the cap.
The valve may break.
If applying excessive torque, the nut may break
according to some installation conditions.
Flare nut
Internally
Incorrect
threaded side
n
c
. h
T
g i
h
e t
n
i w
h t
o t
q r
u
e
wrench.
After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
Therefore, using a torque wrench, tighten the flare
pipe connecting sections that connect the indoor/
outdoor units at the specified tightening torque.
Tightening torque
Incomplete connections may cause not only a gas
leak, but also trouble with the refrigeration cycle.
Do not apply refrigerating machine oil to the
flared surface.
Flare nut
Wrench for work
Loosened
Tightened
Valve at gas side
Use of single wrench
is prohibited
26-EN
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