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9
REFRIGERANT PIPING
Refrigerant Piping
1. Use copper pipe with 0.03" (0.8 mm) or
more thickness. (In case pipe size is dia.
5/8" (15.9), with 0.04" (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 8'2" - 9'9" (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
PIPE SIZE (mm)
MMK
Gas side
AP0307
5/8" (15.9)
AP0367
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: in mm)
RIDGID (Clutch type)
Outer dia. of
copper pipe
1/4" (6.4),
3/8" (9.5)
1/2" (12.7),
5/8" (15.9)
(dia.: in (mm))
Flaring dia. meter size: A (Unit: in (mm))
Liquid side
Outer dia. of copper pipe
3/8" (9.5)
• Do not scratch the inner surface of the flared
part when removing burrs.
• Flare processing under the condition of
scratches on the inner surface of flare
processing part will cause refrigerant gas leak.
• Check that the flared part is not scratched,
deformed, stepped, or flattened, and that there
are no chips adhered or other problems, after
flare processing.
• Do not apply refrigerating machine oil to the
flare surface.
– 20 –
Installation Manual
Tool used
0.02"-0.04"
(0.5-1.0)
0.02"-0.04"
(0.5-1.1)
1/4" (6.4)
3/8" (9.5)
1/2" (12.7)
5/8" (15.9)
CAUTION
B
Conventional
tool used
0.04"-0.06"
(1.0-1.5)
0.06"-0.08"
(1.5-2.0)
R410A
0.36" (9.1)
0.52" (13.2)
0.66" (16.6)
0.78" (19.7)
EN
20-EN
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