Toshiba RAV-SM2244AT7 Installation Manual page 12

Digital Inverter
Flaring
1. Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2. Insert a flare nut into the pipe, and then flare the pipe.
Use the flare nuts supplied with the air conditioner or
those for R410A.
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 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)
Rigid (Clutch type)
Outer diam. of
copper pipe
9.5
12.7
15.9
19.1
Flaring diameter size: A (Unit: mm)
Outer diam. of copper pipe
9.5
12.7
15.9
19.1
* 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.
EN
B
Conventional tool
R410A tool used
R410A
1.0 to 1.5
0 to 0.5
A
+0
A
–0.4
13.2
16.6
19.7
24.0
Connecting the Gas Side Pipe
REQUIREMENT
• Be sure to use the Ø19.1 mm pipe and joint provided as
accessories of the outdoor unit to connect the gas side
Ø19.1 mm pipe and Ø28.6 mm pipe.
• When leading out the pipes toward the front, to one of the
sides or toward the rear, use the Ø19.1 mm pipe and
elbow provided as accessories of the outdoor unit, and
adjust the bending direction. Cut the Ø19.1 mm pipe to
the required length before using it.
1. Align the provided Ø19.1 mm pipe with the pipe lead-out
direction, and shape it so that its end comes out from the
outdoor unit.
2. On the outside of the outdoor unit, use the provided
joints, and braze the Ø19.1 mm pipe and Ø28.6 mm pipe.
used
Ø19.1 mm pipe
(accessory)
Ø19.1 mm pipe
(accessory)
Elbow (accessory)
REQUIREMENT
• Before proceeding to weld the refrigerant pipe, be sure to
pass nitrogen through the pipe to prevent oxidation inside
it. If nitrogen is not passed through the pipe, the
refrigerating cycle may become clogged by oxidized
scales.
• The Ø28.6 mm pipe cannot be passed through the pipe
cover and knockout hole in the base plate so be sure to
connect the Ø19.1 mm pipe and Ø28.6 mm pipe outside
the outdoor unit.
11
Joint (accessory)
Joint
(accessory)
Ø19.1 mm pipe
(accessory)
Ø28.6 mm pipe
(procured locally)
: Brazing
Brazing
Ø19.1 mm pipe
(accessory)