1
0
-2-
6.
Refrigerant piping
CAUTION
Install in rooms that are 5 m
3
or larger. If
a leak of refrigerant gas occurs inside the
room, an oxygen de
fi
ciency may occur.
■
Detaching the Valve cover
Remove the 5 screws.
• Pull the valve cover in the direction of the arrow, and remove it.
Valve cover
■
Refrigerant Piping Connection
Flaring
1. Cut the pipe with a pipe cutter.
Obliquity
Roughness
Warp
90°
2. Remove the burr inside of the pipe.
When removing the burr, be careful so that chips do not fall into the pipe.
3.
4.
Remove the
fl
are nuts attached to the outdoor/indoor unit, then insert them
into each of the pipes.
Flare the pipes.
See the following table for the projection margin (A) and
fl
aring size (B).
Die
Pipe
B
A
Pipe
A
B
Flare Nut
Outside
diameter
Thickness
Rigid
(clutch
type)
R
32
tool
Imperial
(wing
nut type)
R
32
tool
Width
across
flat
Tighten
torque
mm
mm
mm
mm
mm
mm
N•m
kgf•m
6.35
0.8
0 to 0.5
1.5 to
2.0
9.1
17
14 to
18
1.4 to
1.8
9.52
0.8
0 to 0.5
1.5 to
2.0
13.2
22
33 to
42
3.3 to
4.2
12.7
0.8
0 to 0.5
2.0 to
2.5
16.6
26
50 to
62
5.0 to
6.2
Pipe connection
1. Make wire and pipe connections for each indoor unit separately.
2. Align the centres of the connecting pipes and tighten the
fl
are nut as much
as possible with your
fi
ngers, then tighten the nut using a torque wrench.
Be sure to tighten the nut at the speci
fi
ed torque value.
• If you use one outdoor unit for several indoor units of a different class,
connect the largest one
fi
rst A, then connect the rest in the order B to C.
• Do not remove the
fl
are nuts for any ports you are not going to use for
connection.
• Do not leave the
fl
are nut unattached for a long period of time.
• Use a different-diameter joint if the diameters of the connection port and
connection piping are different.
• Mount the different-diameter joint on the connection port of the outdoor
unit.
CAUTION
•
•
Do not scratch the inner surface of the
fl
ared part when removing burrs.
Flare processing under the condition of
scratches on the inner surface of
fl
are
processing part will cause refrigerant gas
leak.
CAUTION
•
KEEP IMPORTANT 6 POINTS FOR
PIPING WORK.
(1)
Take away dust and moisture (inside
of the connecting pipes).
(2)
Tighten the connections (between
pipes and unit).
(3)
Evacuate the air in the connecting
pipes using a VACUUM PUMP.
(4)
Check gas leak (connected points).
(5)
Be sure to fully open the packed
valves before operation.
(6)
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.
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