Toshiba RAS-2M21U2ACVG-SG Service Manual page 51

10-2-6. Refrigerant piping
CAUTION
Install in rooms that are 5 m
a leak of refrigerant gas occurs inside the
room, an oxygen defi ciency may occur.
Detaching the Valve cover
■
Remove the 5 screws.
• Pull the valve cover in the direction of the arrow, and remove it.
Refrigerant Piping Connection
■
Flaring
1. Cut the pipe with a pipe cutter.
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. Remove the fl are nuts attached to the outdoor/indoor unit, then insert them
into each of the pipes.
4. Flare the pipes.
See the following table for the projection margin (A) and fl aring size (B).
A
Pipe
Die
Pipe A
Rigid
(clutch
Outside
Thickness type)
diameter
R32
tool
mm mm mm
6.35 0.8 0 to 0.5
9.52 0.8 0 to 0.5
12.7 0.8 0 to 0.5
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.
or larger. If
3
Valve cover
Roughness
Obliquity Warp
B
B Flare Nut
Imperial
(wing Width
Tighten
nut type) across
torque
R32 flat
tool
mm mm mm N•m
1.5 to 14 to
9.1 17
2.0 18
1.5 to 33 to
13.2 22
2.0 42
2.0 to 50 to
16.6 26
2.5 62
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 specifi 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
• 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.
kgf•m
1.4 to
1.8
3.3 to
4.2
5.0 to
6.2
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