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4-way Air Discharge Cassette Type
6
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 0.03" (0.8 mm) or more
thickness. (In case pipe size is Ø5/8" (15.9 mm), with
0.04" (1.0 mm) or more.)
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 8'2" - 9'10" (2.5 - 3 m) 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
RAV-
name
Gas side
(12.7 mm)
Pipe size
Liquid side
(6.4 mm)
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.
SP240, SP300,
SP180
SP360, SP420
type
type
1/2"
5/8"
(15.9 mm)
1/4"
3/8"
(9.5 mm)
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 : in (mm))
Rigid (Clutch type)
Outer dia. of copper
pipe
1/4" (6.4), 3/8" (9.5)
1/2" (12.7), 5/8" (15.9)
▼ Flaring dia. meter size : A (Unit : in (mm))
Outer dia. of copper
pipe
1/4" (6.4)
3/8" (9.5)
1/2" (12.7)
5/8" (15.9)
* In case of flaring for R410A with the
conventional flare tool, pull it out approx.
0.02" (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.
Tightening connection
• Do not apply excessive torque. Otherwise, the nut
may crack depending on the conditions.
– 16 –
Installation Manual
R410A tool
Conventional
used
tool used
R410A
R410A
0.06" - 0.08"
(1.5 - 2.0)
0 - 0.02"
(0 - 0.5)
0.08" - 0.1"
(2.0 - 2.5)
A
+0
-0,02"(–0,4)
R410A
0.36" (9.1)
0.52" (13.2)
0.65" (16.6)
0.78" (19.7)
A
CAUTION
B
EN
16-EN
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