Balcar R410A Refrigerant Piping And Evacuating, Permissible Piping Length and Heat, Flaring, 131

Flare at indoor unit side

RAV-SM561, 801CT-E

RAV-SM1101, 1401CT-E

4 REFRIGERANT PIPING AND EVACUATING

Refrigerant Piping

•The connecting sections of the refrigerant pipes are provided at the positions in the figure below.

Upper side	Rear side	* When using the drain up kit sold
		separately, the pipe can be drawn
Right		out only from the upper side.

• Flaring diam. 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		19.2

1.Use copper pipe with 0.8 mm or more thickness. (In case pipe size is Ø15.9, with 1.0mm 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.

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 toolsB 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

*In case of flaring for R410A with the conventional

flare tool, pull it out approx.	A
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.

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.)	68 to 82 (6.8 to 8.2 kgf•m)

• Tightening torque of flare pipe connections

Pressure of R410A is higher than that of R22. (Approx. 1.6 times) Therefore, using a torque wrench, tighten the flare pipe connecting sections which connect the indoor

and outdoor units of the

specified tightening torque. Incorrect connections may cause not only a gas

leak, but also a trouble of the refrigeration cycle.

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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