Refrigerant piping, Caution, Permissible piping length and heat – Toshiba RAM-SM560BT-E User Manual

Page 44

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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)

+0
- 0.4

B

A

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

Rigid (Clutch type)

Imperial (Wing nut type)

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

*

In case of flaring for R410A with the conventional
flare tool, pull it out approx.
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)

• 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.

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.

Flare at

indoor

unit side

Flare at

outdoor

unit side

Half union

Flare nut

Externally
threaded side

Internally
threaded side

Use a wrench to secure.

Use a torque wrench to tighten.

Outer diam. of

copper pipe

6.35 to 9.52

R410A tool used

R410A

R22

0 to 0.5 (Same as left)

Conventional tool used

R410A

R22

1.0 to 1.5

0.5 to 1.0

Outer diam. of copper pipe

6.35 or 9.52

12.7 or 15.9

R410A

R22

1.5 to 2.0

1.0 to 1.5

2.0 to 2.5

1.5 to 2.0

Outer diam. of copper pipe

6.35

9.52

12.7

15.9

A

R410A

R22

9.1

9.0

13.2

13.0

16.6

16.2

19.7

19.2

Outer diam. of copper pipe

6.35 mm (diam.)

9.52 mm (diam.)

12.7 mm (diam.)

15.9 mm (diam.)

Tightening torque

14 to 18 (1.4 to 1.8 kgf•m)

33 to 42 (3.3 to 4.2 kgf•m)

50 to 62 (5.0 to 6.2 kgf•m)

63 to 77 (6.3 to 7.7 kgf•m)

Permissible Piping Length and Heat

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

The maximum piping length from the outdoor to indoor unit

30 m (Chargeless 20m)

50 m (Chargeless 20m)

(RAV-SM560AT-E)

(RAV-SM800AT-E)

The maximum height difference outdoor/indoor unit

Outdoor unit is above

Outdoor unit is below

30m

15m

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