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6
REFRIGERANT PIPING
Refrigerant piping
1. Use copper pipe with 0.8 mm or more thickness.
(In case pipe size is Ø15.9, 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.
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)
Permissible piping length and head
They vary according to the outdoor unit. For details, refer to the Installation Manual attached to the outdoor unit.
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)
Outer diam. of copper pipe
6.4 to 15.9
Imperial (Wing nut type)
Outer diam. of copper pipe
6.4 or 9.5
12.7 or 15.9
• Flaring diam. meter size : A (Unit : mm)
Outer diam. of copper pipe
6.4
9.5
12.7
15.9
* 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.
3
Toshiba 1074007701(01EN)_P01-10
R410A tool used
R410A
0 to 0.5
9
CAUTION
R22
R410A
(Same as left)
1.0 to 1.5
R410A
1.5 to 2.0
2.0 to 2.5
+ 0
A
– 0.4
R410A
9.1
13.2
16.6
19.7
8
7/16/04, 13:30
TOSHIBA RAV-SM561KRT-E (EN) 1074007701
Conventional tool used
R22
0.5 to 1.0
R22
1.0 to 1.5
1.5 to 2.0
R22
9.0
13.0
16.2
19.2
A
B
EN
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