Daikin Remote Controller BRC1C61 Manual de instalación descargar pdf (Pagina 8)

6 English

•

Refer to Table 1 for tightening torque.

Tabl e 1

CAUTION

Overtightening may damage the flare and cause leaks.

Be careful for oil not to adhere to any portions other

than a flare part. If oil adhere to resin parts etc., there is

a possibility of damaging by deterioration.

•

Refer to Table 2 if no torque wrench is available.

Using a wrench to tighten flare nuts causes the tightening

torque to suddenly grow much tighter after a certain point.

From there, tighten the nut further by the appropriate angle

listed in Table 2.

(2)

After the work is finished, make sure to check that

there is no gas leak.

(3)

After checking for gas leaks, be sure to insulate the

pipe connections referring to Fig. 8.

•

Insulate using the insulation for fitting (3) (4) included with

the liquid and gas pipes. Besides, make sure the insula-

tion for fitting (3) (4) on the liquid and gas piping has its

seams facing up.

(Tighten both edges with clamp (9).)

•

For the gas piping, wrap the mid. sealing pad (6) over the

insulation for fitting (4) (flare nut part).

CAUTION

Be sure to insulate any field piping all the way to the piping

connection inside the unit. Any exposed piping may cause

condensation or burns if touched.

•

When brazing the refrigerant piping, perform nitrogen

replacement first, or perform the brazing (CAUTION 2) while

feeding nitrogen into the refrigerant piping (CAUTION 1), and

finally connect the indoor unit using the flare connections.

(Refer to Fig. 9)

CAUTION

1. When brazing a pipe while feeding nitrogen inside the

pipe, make sure to set the nitrogen pressure to 0.02 MPa

(0.2 kg/cm

) using the pressure reducing valve. (This

pressure is such that breeze is blown to your cheek.)

2. Do not use a flux when brazing the refrigerant pipe joints.

Use phosphor copper brazer (BCuP-2: JIS Z 3264/B-

Cu93P-710/795: ISO 3677) which does not require flux.

(Using a flux containing chlorine may cause the piping to

corrode. Using a welding flux containing fluorine may

cause the refrigerant lubricant to deteriorate, and affect

adversely the refrigerant piping system.)

Not recommendable but in case of emergency

You must use a torque wrench but if you are obliged to install the

unit without a torque wrench, you may follow the installation

method mentioned below.

After the work is finished, make sure to check that there is

no gas leak.

When you keep on tightening the flare nut with a spanner, there

is a point where the tightening torque suddenly increases. From

that position, further tighten the flare nut the angle shown below:

Tabl e 2

Pipe

size

Tightening torque

Flare dimen-

sion A (mm)

Flare shape

φ 6.4

(1/4”)

14.2 – 17.2 N·m

(144 – 176 kgf·cm)

8.7 – 9.1

φ 9.5

(3/8”)

32.7 – 39.9 N·m

(333 – 407 kgf·cm)

12.8 – 13.2

φ 12.7

(1/2”)

49.5 – 60.3 N·m

(504 – 616 kgf·cm)

16.2 – 16.6

φ 15.9

(5/8”)

61.8 – 75.4 N·m

(630 – 770 kgf·cm)

19.3 – 19.7

Ⳳ

R0.4-0.8

Ⳳ

Gas pipe

Piping insulation

material (main unit)

Attach to base

Flare nut connection

Turn seams up

Mid. sealing pad (6)

Insulation for fitting (4)

Gas Piping Insulation Procedure

Liquid Piping Insulation Procedure

(accessory)

Clamp (9)

Piping insulation material

(Field supply)

Clamp (9) (accessory)

Flare nut connection

Turn seams up

Piping insulation material

(Field supply)

Piping insulation material

(main unit)

Attach to base

Main unit

Fig. 8

Liquid pipe

Insulation for fitting (3)

(accessory)

Wrap over the top of

the flare nut connection.

Main unit

Pipe size Further tightening angle

Recommended arm

length of tool

φ 6.4 (1/4”) 60 to 90 degrees Approx. 150mm

φ 9.5 (3/8”) 60 to 90 degrees Approx. 200mm

φ 12.7 (1/2”) 30 to 60 degrees Approx. 250mm

φ 15.9 (5/8”) 30 to 60 degrees Approx. 300mm

Refrigerant piping

Part to be brazed

Taping

Pressure-reducing valve

hands

valve

Nitrogen

Fig. 9

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