86
SMMS High-Wall Type
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.
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
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)
▼
Flaring dia. meter size: A (Unit: 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.
(dia.: mm)
Gas side
9.5
Liquid side
6.4
Outer dia. of
copper pipe
R410A tool used
Conventional
tool used
6.4, 9.5
0 to 0.5
1.0 to 1.5
12.7, 15.9
Outer dia. of copper pipe
R410A
6.4
9.1
9.5
13.2
12.7
16.6
15.9
19.7
B
A
0
-0.4
+
A
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