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Optional installation parts
(Locally procured)
Parts name
Q’ty
A
Refrigerant piping
Liquid side: Ø6.4 mm
Gas side: Ø9.5, 12.7 mm
One each
B
Pipe insulating material
(polyethylene foam, 6 mm thick)
1
C
Putty, PVC tape
One each
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Refrigerant piping connection
CAUTION
Take note of these 4 important points below for
piping work.
1. Keep dust and moisture away from inside the
connecting pipes.
2. Tightly connect the connection between pipes and
the unit.
3. Evacuate the air in the connecting pipes using a
VACUUM PUMP.
4. Check for gas leaks at connection points.
Piping connection
(Unit: mm)
RAV-
Liquid side
Gas side
Outer
diameter
Thickness
Outer
diameter
Thickness
SM30
Ø6.4
0.8
Ø9.5
0.8
SM40
Ø6.4
0.8
Ø12.7
0.8
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 R410A.
Insert a
fl
are nut into the pipe, and
fl
are the pipe.
As the
fl
aring sizes of R410A differ from those of
refrigerant R22, the
fl
are tools newly
manufactured for R410A are recommended.
However, the conventional tools can be used by
adjusting the projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
B
Rigid (Clutch type)
Outer dia. of
copper pipe
R410A tool used
Conventional
tool used
R410A
R410A
6.4
0 to 0.5
1.0 to 1.5
9.5
12.7
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
* In case of flaring for 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.
5
Refrigerant
piping
■
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
Fix with wrench.
Externally
threaded side
Internally
threaded side
Tighten with torque
wrench.
Flare nut
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)
Flare nut
Wrench for work
Wrench for fixing
Valve at gas side
Cap
Loosened
Tightened
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.
In correct
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
• Pressure of R410A is higher than that of R22
(Approx. 1.6 times).
Therefore, using a torque wrench, tighten the flare
pipe connecting sections that connect the indoor /
outdoor units at the specified tightening torque.
Incomplete connections may cause not only a gas
leak, but also trouble with the refrigeration cycle.
Do not apply refrigerant oil to the flared surface.
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10/18/14 10:23 AM
10/18/14 10:23 AM
