26-EN
25-EN
– 13 –
CAUTION
y
Do not scratch the inner surface of the
fl
ared part
when removing burrs.
y
Flare processing under the condition of scratches
on the inner surface of
fl
are processing part will
cause refrigerant gas leak.
y
Check that the
fl
ared part is not scratched,
deformed, stepped, or
fl
attened, and that there
are no chips adhered or other problems, after
fl
are
processing.
y
Do not apply refrigerating machine oil to the
fl
are
surface.
Tightening of connecting part
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
Flare nut
Internally
threaded side
Externally
threaded side
Fix with wrench.
Tighten with torque
wrench.
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
the liquid side.
(Unit: N•m)
Outer dia. of copper pipe
Tightening torque
6.4 mm (dia.)
14 to 18 (1.4 to 1.8 kgf•m)
9.5 mm (dia.)
34 to 42 (3.4 to 4.2 kgf•m)
12.7 mm (dia.)
49 to 61 (4.9 to 6.1 kgf•m)
15.9 mm (dia.)
63 to 77 (6.3 to 7.7 kgf•m)
Flare nut
Wrench for work
Loosened
Cap
Tightened
Wrench for
fi
Valve at gas side
CAUTION
y
Do not put the crescent wrench on the cap.
The valve may break.
y
If applying excessive torque, the nut may break
according to some installation conditions.
Incorrect
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
• Therefore, using a torque wrench, tighten the
fl
are
pipe connecting sections that connect the indoor/
outdoor units at the speci
fi
ed 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
fl
ared surface.
5
Refrigerant piping
Optional installation parts
(Locally procured)
Parts name
Q’ty
A
Refrigerant piping
Liquid side: Ø6.4, 9.5 mm
Gas side: Ø12.7, 15.9 mm
One each
B
Pipe insulating material
(polyethylene foam, 6 mm thick)
1
C
Putty, PVC tape
One each
Refrigerant piping connection
CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Reusable mechanical connectors and
fl
ared
joints are not allowed indoors. When mechanical
connectors are reused indoors, sealing parts shall
be renewed.
When
fl
ared joints are reused indoors, the
fl
are
part shall be refabricated.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes by using
VACUUM PUMP.
4. Check the gas leakage. (Connected points)
Piping connection
(Unit: mm)
RAV-
Liquid side
Gas side
Outer
diameter
Thickness
Outer
diameter
Thickness
GM56
Ø6.4
0.8
Ø12.7
0.8
GM80
Ø9.5
0.8
Ø15.9
1.0
Flaring
1. Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2. Insert a
fl
are nut into the pipe, and then
fl
are the
pipe.
Use
the
fl
are nuts supplied with the air conditioner
or those for R32.
Insert
a
fl
are nut into the pipe, and
fl
are the pipe.
Use
the
fl
are nuts supplied with the air conditioner
or
fl
are nuts for R32 or R410A.
However, the conventional tools can be used by
adjusting the projection margin of the copper pipe.
Projection margin in
fl
aring: B (Unit: mm)
B
Rigid (Clutch type)
Outer dia. of
copper pipe
R32/R410A tool
used
Conventional
tool used
6.4
0 to 0.5
1.0 to 1.5
9.5
12.7
15.9
Flaring dia. size: A (Unit: mm)
A
Outer dia. of copper pipe
A
+0
–0.4
6.4
9.9
9.5
13.2
12.7
16.6
15.9
19.7
* In case of
fl
aring for R32/R410A with the
conventional
fl
are tool, pull the tool out approx.
0.5 mm more than that for R22 to adjust it to the
speci
fi
ed
fl
are size.
The copper pipe gauge is useful for adjusting the
projection margin size.
