Toshiba R410A service manual Permissible piping length and heat, Flaring dia meter size a Unit mm

Flare at indoor unit side

6 REFRIGERANT PIPING

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 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.

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

The maximum piping length from the outdoor to indoor unit

30 m (Chargeless 20 m)	15 m (Chargeless 15 m)
(RAV-SM561/801AT)	(RAV-SM1101/1401AT)

The maximum height difference outdoor/indoor unit

Outdoor unit is above	Outdoor unit is below
30 m	30 m

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. B

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	R410A tool used		Conventional tool used
copper pipe	R410A	R22	R410A	R22
6.4 to 15.9	0 to 0.5	(Same as left)	1.0 to 1.5	0.5 to 1.0

Imperial (Wing nut type)

Outer diam. of copper pipe	R410A	R22
6.4 or 9.5	1.5 to 2.0	1.0 to 1.5
12.7 or 15.9	2.0 to 2.5	1.5 to 2.0

• Flaring dia meter size : A (Unit : mm)

		A +0
Outer diam. of copper pipe		- 0.4
	R410A		R22
6.4	9.1		9.0
9.5	13.2		13.0
12.7	16.6		16.2
15.9	19.7		19.4

*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	A
adjust to the specified flare size.
The copper pipe gauge is useful
for adjusting projection margin size.

Tightening connection

CAUTION

•Do not apply excessive torque. Otherwise, the nut may crack depending on the conditions.

	(Unit : N•m)
Outer diam. of copper pipe	Tightening torque
6.4 mm (diam.)	14 to 18 (1.4 to 1.8 kgf•m)
9.5 mm (diam.)	33 to 42 (3.3 to 4.2 kgf•m)
12.7 mm (diam.)	50 to 62 (5.0 to 6.2 kgf•m)
15.9 mm (diam.)	63 to 77 (6.3 to 7.7 kgf•m)

•Tightening torque of flare pipe connections

Pressure of R410A becomes higher than that of R22. (Approx. 1.6 times) Therefore, using a torque wrench, tighten firmly the flare pipe connecting

sections which connect the indoor and outdoor units up to the specified tightening torque.

Incorrect connections may cause not only a gas leakage, but also a trouble of the refrigeration cycle or compressor damage.

Flare at outdoor unit side

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

Half union	Flare nut
Externally	Internally
threaded side	threaded side
Use a wrench to secure.	Use a torque wrench to tighten.

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