Toshiba RAV-SP180UT-UL Refrigerant Piping and Evacuating, „ Refrigerant Piping, „Pipe size

4-way Air Discharge Cassette Type Installation Manual

6 REFRIGERANT PIPING AND EVACUATING

„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 0.03" (0.8 mm) or more thickness. (In case pipe size is Ø5/8" (15.9 mm), with 0.04" (1.0 mm) or more.)

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.

REQUIREMENT

When the refrigerant pipe is long, provide support brackets at intervals of 8’2” - 9’10” (2.5 - 3 m) to clamp the refrigerant pipe. Otherwise, abnormal sound may be generated.

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)

„Pipe size

Model		SP180	SP240, SP300,
	RAV-		SP360, SP420
name		type
			type
	Gas side	1/2"	5/8"
		(12.7 mm)	(15.9 mm)
Pipe size
	Liquid side	1/4"	3/8"
		(6.4 mm)	(9.5 mm)

„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.

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

▼Projection margin in

flaring : B (Unit : in (mm))

Rigid (Clutch type)

Outer dia. of copper	R410A tool	Conventional
	used	tool used
pipe
	R410A	R410A
1/4” (6.4), 3/8” (9.5)		0.06” - 0.08”
	0 - 0.02”	(1.5 - 2.0)
1/2” (12.7), 5/8” (15.9)	(0 - 0.5)	0.08” - 0.1”
		(2.0 - 2.5)

▼Flaring dia. meter size : A (Unit : in (mm))

Outer dia. of copper	A -+00,02"(–0,4)
pipe
	R410A
1/4” (6.4)	0.36” (9.1)
3/8” (9.5)	0.52” (13.2)
1/2” (12.7)	0.65” (16.6)
5/8” (15.9)	0.78” (19.7)

* In case of flaring for R410A with the	A
conventional flare tool, pull it out approx.
0.02" (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.

EN

– 16 – 16-EN