Refrigerant Piping And Evacuating - Toshiba RAV-SM404SDT-E Installation Manual

Slim Duct Type
7

REFRIGERANT PIPING AND EVACUATING

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.
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
RAV-
name
Gas side
Pipe size
Liquid side
CAUTION
SM404, 454, 564 type
12.7 mm
6.4 mm
– 16 –
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
Outer diam. of
used
copper pipe
R410A
6.4
0 to 0.5
12.7
▼ Flaring diam. meter size : A (Unit : mm)
Outer diam. of copper
pipe
6.4
12.7
* 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.
Installation Manual
B
EN
Conventional
tool used
R410A
1.5 to 2.0
2.0 to 2.5
+0
A
–0.4
R410A
9.1
16.6
A
16-EN