Refrigerant Piping And Evacuating - Toshiba RAS-M10SMUV-E Installations-Handbuch

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 0.8 mm or more thickness.
3. Flare nut and flare works are different from those of the conventional refrigerant.
Take out the flare nut attached to the main unit of the air conditioner, and use it.
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)
Permissible piping length and heat
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 diameter of copper pipe
6.4
9.5
12.7
• Flaring diam. meter size : A (Unit: mm)
* In the case of flaring for R410A with the conventional flare tool, pull it approx. 0.5 mm further out than that for R22 to adjust to the
specified flare size. The copper pipe gauge is useful for adjusting the projection margin size.
R410A tool used
R410A
0 to 0.5 (Same as left)
0 to 0.5 (Same as left)
0 to 0.5 (Same as left)
Imperial (Wing nut type)
Outer diameter of copper pipe
6.4
9.5
12.7
Outer diameter of copper pipe
6.4
9.5
12.7
15
Conventional tool used
R22 R410A
1.0 to 1.5
1.0 to 1.5
1.0 to 1.5
R410A
1.5 to 2.0
1.5 to 2.0
2.0 to 2.5
R410A
9.1
13.2
16.6
R22
0.5 to 1.0
0.5 to 1.0
0.5 to 1.0
R22
1.0 to 1.5
1.0 to 1.5
1.5 to 2.0
+0
A
–0.4
R22
9.0
13.0
16.2
EN