Toshiba RAV-SM2802DT-TR Refrigerant Piping and Evacuating, Heat insulating process, Pipe size

Concealed Duct High Static Pressure Installation Manual

nHeat insulating process

Concealed Duct High Static Pressure Installation Manual

7 REFRIGERANT PIPING AND EVACUATING

•After drain check, covering the heat insulator for drain connecting section, wrap the drain pipe with heat insulator (Locally procured) without clearance from the end of the drain pipe connecting port of the indoor unit.

Drain pipe	Heat insulation (Locally procured)
connecting port	Thickness 10mm or more

Indoor unit

nRefrigerant 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 general copper pipes with a wall thickness of

0.8mm for Ø12.7 mm, and with a wall thickness of

1.0mm for Ø28.6 mm (half hard).

Do not use any copper pipes with a wall thickness less than these thicknesses.

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.

nLiquid side refrigerant pipe connection

Permissible Piping Length and Height Difference

They vary according to the outdoor unit.

For details, refer to the Installation Manual attached to the outdoor unit.

Flaring

•Cut the pipe with a pipe cutter. Remove burrs completely.

Remaining burrs may cause gas leakage.

•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.

REQUIREMENT

When the refrigerant pipe is long, provide support brackets at intervals of 2.5 to 3 m to clamp the refrigerant pipe.

Otherwise, abnormal sound may be generated.

However, the conventional tools can be used by adjusting projection margin of the copper pipe.

B

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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)

n Pipe size

Pipe size	Gas side	Liquid side
	28.6 mm	12.7 mm

u Projection margin in flaring: B (Unit: mm)

Rigid (Clutch type)

Outer dia. of	R410A tool used	Conventional tool used
copper pipe	R410A	R410A
12.7	0 to 0.5	1.5 to 2.0

u Flaring dia. meter size: A (Unit: mm)

Outer dia. of copper pipe	A	–0.02”+0(–0.4)
	R410A
12.7		16.6
∗ In case of flaring for R410A with the			A
conventional flare tool, pull it out approx.

0.5mm more than that for R22 to adjust to the specified flare size.

The copper pipe gauge is useful for adjusting projection margin size.

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