Refrigerant Piping - Toshiba RAV-SM404SDT-E Installation Manual

◆ Concealed duct type
◆ Ledge ceiling concealed duct type
21-EN
Supply chamber
Channel
Supply grille
Supplying
200mm (diam.)
round duct
Supplying
Indoor unit
Returning
Return air grille
Supplying
Supply grille
Indoor unit
Supply
chamber
Supplying
200mm (diam.)
Return air grille
round duct
Returning
– 11 –
7

Refrigerant piping

Refrigerant piping
1
If the outdoor units are to be mounted on a wall,
make sure that the supporting platform is
sufficiently strong. The platform should be
designed and manufactured to maintain its strength
over a long period of time, and sufficient
consideration should be given to ensuring that the
outdoor unit will not fall.
2
Use copper pipe with 0.8 mm or more thickness.
3
Flare nut and flare works are also different from
those of the conventional refrigerant.
Take out the flare nut attached to the main unit of
the air conditioner, and use it.
REQUIREMENT
When the refrigerant pipe is long, provide support brackets
at intervals of 2.5 to 3m to clamp the refrigerant pipe.
Otherwise, abnormal sound may be generated.
CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Remove dust and moisture from the 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 the gas leakage. (Connected points)
Pipe size
Model name RAV- SM404, 454, 564 type
Gas side 12.7 mm
Pipe size
Liquid side
Permissible piping length and
height difference
They vary according to the outdoor unit.
For details, refer to the Installation Manual attached to the
outdoor unit.
◆ Flaring
• Cut the pipe with a pipe cutter.
Remove burrs completely.
Remaining burrs may cause gas leakage.
• 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
projection margin of the
copper pipe.
▼ Projection margin in flaring : B (Unit : mm)
Rigid (Clutch type)
R410A tool used
Outer dia. of
copper pipe
R410A
6.4
0 to 0.5
12.7
▼ Flaring dia. meter size : A (Unit : mm)
Outer diam. of copper pipe
6.4
12.7
6.4 mm
* In case of flaring for R410A with the
conventional flare tool, pull it out 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.
B
Conventional
tool used
R410A
1.5 to 2.0
2.0 to 2.5
+0
A
–0.4
R410A
9.1
16.6
A
22-EN