Toshiba RAS-M13EKCVP-E, RAS-M18EACV-E, RAS-M14EACV-E Refrigerant Piping Connection, 72

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 –