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6
REFRIGERANT PIPING
Refrigerant Piping
1. If the outdoor units are to be mounted on a wall, make sure that the platform supporting 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.
IMPORTANT 4 POINTS FOR PIPING WORK
1. Take away 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)
Permissible Piping Length and Head
The maximum piping length from the outdoor to indoor unit
30 m (Without charge 20m)
(RAV-SM560AT-E)
Flaring
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 used
Outer diam. of
copper pipe
R410A
6.35
0 to 0.5 (Same as left)
9.52
0 to 0.5 (Same as left)
12.7
0 to 0.5 (Same as left)
• Flaring dia meter size : A (Unit : mm)
Outer diam. of copper pipe
6.35
9.52
12.7
50 m (Without charge 20m)
(RAV-SM800AT-E)
Conventional tool used
R22
R410A
R22
1.0 to 1.5
0.5 to 1.0
1.0 to 1.5
0.5 to 1.0
1.0 to 1.5
0.5 to 1.0
+0
A
- 0.4
R410A
R22
9.1
9.0
13.2
13.0
16.6
16.2
CAUTION
The maximum height difference outdoor/indoor unit
Outdoor unit is above
30m
Imperial (Wing nut type)
Outer diam. of copper pipe
6.35
9.52
12.7
In the case of flaring for R410A with the conventional
*
flare tool, pull out it 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.
98
Outdoor unit is below
15m
B
R410A
R22
1.5 to 2.0
1.0 to 1.5
1.5 to 2.0
1.0 to 1.5
2.0 to 2.5
1.5 to 2.0
A
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