10-5-2. Refrigerant Piping Connection

Flaring

1.Cut the pipe with a pipe cutter.

Obliquity Roughness Warp

2.Insert a flare nut into the pipe, and flare the pipe.

•Projection margin in flaring: A (Unit: mm)

Rigid (Clutch type)

Outer diameter of copper pipe

R410A tool used

Conventional tool used

 

 

 

6.35

0 to 0.5

1.0 to 1.5

 

 

 

9.52

0 to 0.5

1.0 to 1.5

 

 

 

12.7

0 to 0.5

1.0 to 1.5

 

 

 

Die Pipe

3.Flaring size : B (Unit : mm)

Imperial (Wing nut type)

Outer diameter of copper pipe

 

R410A

 

 

 

 

6.35

 

1.5 to 2.0

 

 

 

 

9.52

 

1.5 to 2.0

 

 

 

 

12.7

 

2.0 to 2.5

 

 

 

 

 

 

 

 

Outer diameter of copper pipe

 

B –0.4+0

 

 

 

 

R410A

 

R22

 

 

 

 

6.35

9.1

 

9.0

 

 

 

 

9.52

13.2

 

13.0

 

 

 

 

12.7

16.6

 

16.2

 

 

 

 

•In case of flaring for R410A with the conventional flare tool, pull it out approx. 0.5 mm more than that of R22 to adjust to the specified flare size. The copper pipe gauge is useful for adjusting projection margin size.

Tighten the connection

Align the centers of the connecting pipes and tighten the flare nut as much as possible with your fingers. Then tighten the nut with a wrench and torque wrench as shown in the figure.

Half union

Flare nut

 

 

 

 

 

 

 

 

Externally threaded side

Internally threaded side

Use a wrench to secure.

Use a torque wrench to tighten.

CAUTION

• Do not apply excessive force. Otherwise, the nut may break.

 

 

(Unit: N·m)

Outer diameter of copper pipe

Tightening torque

 

 

 

 

 

φ6.35 mm

14 to 18

(1.4 to 1.8 kgf·m)

 

 

 

 

 

φ9.52 mm

33 to 42

(3.3 to 4.2 kgf·m)

 

 

 

 

 

φ12.7 mm

50 to 62

(5.0 to 6.2 kgf·m)

 

 

 

 

 

Flare at indoor unit side

Flare at outdoor unit side

– 72 –

Page 71 Page 73
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Image 72
Toshiba RAS-M13EKCVP-E, RAS-M18EACV-E, RAS-M14EACV-E, RAS-M16EKCVP-E, RAS-M10EKCVP-E Flaring, Tighten the connection
Page 71 Page 73

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