Refrigerant Piping - Toshiba RAV-GM901KRTP-E Installation Manual

9

REFRIGERANT PIPING

Refrigerant Piping
1. Use copper pipe with 0.8 mm or more
thickness. (In case pipe size is dia. 15.9,
with 1.0 mm or more.)
2. 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 3 m to
clamp the refrigerant pipe. Otherwise, abnormal
sound may be generated.
IMPORTANT 4 POINTS FOR PIPING WORK
1. Reusable mechanical connectors and
flared joints are not allowed indoors. When
mechanical connectors are reused indoors,
sealing parts shall be renewed. When flared
joints are reused indoors, the flare part shall
be refabricated.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes by
using VACUUM PUMP.
4. Check the gas leakage. (Connected points)
Pipe size
RAV
Gas side
GM90
21-EN
CAUTION
PIPE SIZE (mm)
Liquid side
15.9 9.5
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 R32 differ from those
of refrigerant R22, the flare tools newly
manufactured for R32 are recommended.
However, the
conventional tools can
be used by adjusting
projection margin of the
copper pipe.
Projection margin in flaring: B (Unit: mm)
RIDGID (Clutch type)
Outer dia. of
copper pipe
6.4 , 9.5
12.7 , 15.9
Flaring dia. meter size: A (Unit: mm)
Outer dia. of copper pipe
(dia. : mm)
– 21 –
Installation Manual
Tool used
0.5 to 1.0
0.5 to 1.1
6 4 .
9 5 .
1 2 7 .
1 5 9 .
B
Conventional
tool used
1.0 to 1.5
1.5 to 2.0
+0
A
-0.4
9 1 .
1 3 2 .
1 6 6 .
1 9 7 .