Refrigerant Piping Connection - Toshiba RAS-M10UKV-E3 Service Manual

9-3-6. Refrigerant Piping Connection

CAUTION
KEEP IMPORTANT 4 POINTS FOR PIPING
WORK
1. Take away dust and moisture.
(Inside of the connecting pipes)
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes using
VACUUM PUMP .
4. Check gas leak. (connected points)
Flaring
1. Cut the pipe with a pipe cutter.
90˚
Fig. 9-3-2
2. Insert a flare nut into the pipe, and flare the pipe.
As the flaring sizes of R410A differ from those of
refrigerant R22, the flare tools newly manufac-
tured for R410A are recommended.
However, the conventional tools can be used by
adjusting projection margin of the copper pipe.
Fig. 9-3-3
• Projection margin in flaring : B (Unit : mm)
Rigid (Clutch type)
R410A tool used
Outer dia. of
copper pipe
R410A
6.35 0 to 0.5 (Same as left)
9.52 0 to 0.5 (Same as left)
12.7 0 to 0.5 (Same as left)
Imperial (Wing nut type)
Outer dia. of copper pipe
6.35
9.52
12.7
Obliquity Roughness
B
Conventional tool used
R22 R410A
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
R410A R22
1.5 to 2.0 1.0 to 1.5
1.5 to 2.0 1.0 to 1.5
2.0 to 2.5 1.5 to 2.0
• Flaring size : A (Unit : mm)
Outer dia. of copper pipe
In the case of flaring for R410A with the conven-
*
tional flare tool, pull out it approx.
0.5 mm more than that for R22 to
adjust to the specified flare size.
The copper pipe gauge is useful
for adjusting projection margin size.
9-3-7. Installation
NOTE : For installation, at least 3 dimensions should
be kept free from obstacles (walls).
Warp
As shown in the figure, hang power cord
and connecting cable downward, and
take out it along piping connection port.
Fixing bolt arrangement of outdoor unit
R22
• Secure the outdoor unit with the fixing bolts
and nuts if the unit is likely to be exposed to a
strong wind.
• Use Ø8 mm or Ø10 mm anchor bolts and nuts.
– 73 –
R410A
6.35 9.1
9.52 13.2
12.7 16.6
Fig. 9-3-5
600
Suction side
Diffuser
Fig. 9-3-6
+0
A
- 0.4
R22
9.0
13.0
16.2
A
Fig. 9-3-4