Refrigerant Piping Connection - Toshiba RAS-4M23SACV-E Installation Manual

When the outdoor unit is to be installed in an area with a snowy or
cold climate
• Allow the water in the outdoor unit to drip onto the ground. (Do not use a hose to
drain off the water.)
• The drain water may freeze inside the base plate at below freezing outside air
temperatures so use a screwdriver or other tool to open the knock-out holes in
the base plate.
The water will drain more efficiently when the knock-out holes are opened. (Use
a screwdriver or other tool to pull out the knock-out pieces.)

Refrigerant Piping Connection

Flaring
1. Cut the pipe with a pipe cutter.
2. Insert a flare nut into the pipe, and flare the pipe.
• Projection margin in flaring: A (Unit: mm)
Rigid (Clutch type)
Outer diameter of copper pipe
6.35
9.52
12.7
Die
3. Flaring size: B (Unit: mm)
• In case of flaring for R410A with the conventional flare tool, pull it out approx. 0.5 mm more than that of R22 to adjust the
specified flare size. The copper pipe gauge is useful for adjusting projection margin size.
Tighten the connection
Align the centers of the connecting pipes and tighten the flare nut as much as possible with your fingers. Then tighten the nut with a
wrench and torque wrench as shown in the figure.
CAUTION
• Do not apply excessive force. Otherwise, the nut may break.
EN
Imperial (Wing nut type)
Pipe
Externally threaded side
Use a wrench to secure.
Obliquity
R410A tool used
0 to 0.5
0 to 0.5
0 to 0.5
Outer diameter of copper pipe
6.35
9.52
12.7
Outer diameter of copper pipe
6.35
9.52
12.7
Flare nut
Half union
Use a torque wrench to tighten.
8
Knock-out holes
Warp
Roughness
Conventional tool used
1.0 to 1.5
1.0 to 1.5
1.0 to 1.5
R410A
1.5 to 2.0
1.5 to 2.0
2.0 to 2.5
R410A
9.1
13.2
16.6
Internally threaded side
+0
B
–0.4
R22
9.0
13.0
16.2