Toshiba RAV-GM901CTP-E Installation Manual Download Page 15

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– 14 –

Right

Upper

Back

Refrigerant piping

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Take out direction of
refrigerant pipe

• The refrigerant pipe connecting sections are located

as shown below. (Pipes can be taken out from one of
the three directions.)

• Make a pipe knockout hole, referring to the section

“Pipe knockout hole”.

* When Drain Pump Kit (sold separately) is installed, a

refrigerant pipe can only be taken out from upper direction.

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Permissible piping length and
height difference

They vary depending on the outdoor unit. For details,
refer to the Installation Manual attached to the outdoor
unit.

CAUTION

IMPORTANT 4 POINTS FOR PIPING WORK

1. Reusable mechanical connectors and

ared

joints are not allowed indoors. When mechanical
connectors are reused indoors, sealing parts shall
be renewed. When

ared joints are reused indoors,

the

are part shall be refabricated.

2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes by using

VACUUM PUMP.

4. Check the gas leakage. (Connected points)

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Pipe size

Model

Pipe size (mm)

Gas side

Liquid side

GM90

Ø15.9

Ø9.5

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Connecting refrigerant piping

Flaring

• Cut the pipe with a pipe cutter.

Remove burrs completely.
Remaining burrs may cause gas leakage.

• Insert a

are nut into the pipe, and

are the pipe.

As the

aring sizes of R32 differ from those of

refrigerant R22, the

are tools newly manufactured for

R32 are recommended.
However, the conventional tools can be used by
adjusting projection margin of the copper pipe.

Projection margin in

aring: B (Unit: mm)

Outer dia. of

copper pipe

Tool used

Conventional

tool used

6.4, 9.5

0.5 to 1.1

1.0 to 1.5

12.7, 15.9

0.5 to 1.1

1.5 to 2.0

CAUTION

When the refrigerant pipe is long, provide support
brackets at intervals of 2.5 m to 3 m to clamp the
refrigerant pipe. Otherwise, abnormal sound may be
generated.

Flaring diameter size: A (Unit: mm)

CAUTION

• Do not scratch the inner surface of the

ared part when

removing burrs.

• Flare processing under the condition of scratches on

the inner surface of

are processing part will cause

refrigerant gas leak.

• Check that the

ared part is not scratched, deformed,

stepped, or

attened, and that there are no chips

adhered or other problems, after

are processing.

• Do not apply refrigerating machine oil to the

are

surface.

* In case of

aring with the conventional

are tool,

pull it out approx. 0.5 mm more than that for R22 to
adjust to the speci

are size. The copper pipe

gauge is useful for adjusting projection margin size.

• The sealed gas was sealed at the atmospheric

pressure so when the

are nut is removed, there

will no “whooshing” sound: This is normal and is not
indicative of trouble.

• Use two wrenches to connect the indoor unit pipe.

Work using double spanner

• Use the tightening torque levels as listed in the table

below.

Outer dia. of

connecting pipe (mm)

Tightening torque (N•m)

6.4

14 to 18 (1.4 to 1.8 kgf•m)

9.5

34 to 42 (3.4 to 4.2 kgf•m)

12.7

49 to 61 (4.9 to 6.1 kgf•m)

15.9

63 to 77 (6.3 to 7.7 kgf•m)

▼

Tightening torque of

are pipe connections.

Incorrect connections may cause not only a gas leak,
but also a trouble of the refrigeration cycle.
Align the centres of the connecting pipes and tighten
the

are nut as far as possible with your

ngers. Then

tighten the nut with a spanner and torque wrench as
shown in the

gure.

CAUTION

Tightening with an excessive torque may crack the nut
depending on installation conditions.

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Evacuation

Perform vacuuming from the charge port of valve of
the outdoor unit by using a vacuum pump.
For details, follow to the Installation Manual attached to
the outdoor unit.
• Do not use the refrigerant sealed in the outdoor unit

for evacuation.

REQUIREMENT

For the tools such as charge hose, use those
manufactured exclusively for R32.

Refrigerant amount to be added

For addition of the refrigerant, add refrigerant “R32”
referring to the attached Installation Manual of outdoor
unit.
Use a scale to charge the refrigerant of speci

amount.

REQUIREMENT

• Charging an excessive or too little amount of

refrigerant causes a trouble of the compressor.
Charge the refrigerant of speci

ed amount.

• A personnel who charged the refrigerant should

write down the pipe length and the added refrigerant
amount in the F-GAS label of the outdoor unit. It is
necessary to

x the compressor and refrigeration

cycle malfunction.

Outer dia. of copper pipe

+0
–0.4

6.4