Daikin ATYN-L - Инструкция по эксплуатации - Страница 12

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Piping Works And Flaring Technique

Do not use contaminated or damaged copper tubing. If 
any piping, evaporator or condenser had been exposed or 
had been opened for 15 seconds or more, the system must 
be vacuumed. Generally do not remove plastic, rubber 
plugs and brass nuts from the valves, fittings, tubing and 
coils until it is ready to connect suction or liquid line into 
valves or fittings.
If any brazing work is required, ensure that nitrogen gas 
is passed through coil and joints while the brazing work 
is being done. This will eliminate soot formation on the 
inside wall of copper tubings.
Cut the pipe stages by stages, advancing the blade of pipe 
cutter slowly. Extra force and a deep cut will cause more 
distortion of pipe and therefore extra burr. See Figure I.
Remove burrs from cut edges of the pipes with remover. See 
Figure II. Hold the pipe on top position and burr remover 
at lower position to prevent metal chips from entering the 
pipe. This will avoid unevenness on the flare faces which 
will cause gas leak.
Insert the flare nuts, mounted on the connection parts 
of both the indoor unit and outdoor unit, into the copper 
pipes.
The exact length of pipe protruding from the top surface 
of the swaging block is determined by the flaring tool. 
See Figure III.
Fix the pipe firmly on the swaging block. Match the centers 
of both the swaging block and the flaring punch, then 
tighten the flaring punch fully.

Piping Connection To The Units

Align the center of the piping and tighten the flare nut 
sufficiently with fingers. See Figure IV.
Finally, tighten the flare nut with torque wrench until the 
wrench clicks.
When tightening the flare nut with the torque wrench, 
ensure that the tightening direction follows the arrow 
indicated on the wrench.
The refrigerant pipe connection are insulated by closed 
cell polyurethane.

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1/4t

Cutting Copper Tube

Copper Tube

Swaging Block

Remove Burr

Copper Tube

Figure I

D

A

Pipe Size (mm/in)

Torque, Nm/(ft-lb)

6.35 (1/4")

18 (13.3)

9.52 (3/8")

42 (31.0)

12.70 (1/2") 

55 (40.6)

15.88 (5/8") 

65 (48.0)

19.05 (3/4") 

78 (57.6)

Flared Tube

Flare Joint

Flare Nut

Indoor Piping

Torque Wrench

Ø Tube, D

A (mm)

Inch

mm

Imperial 

(Wing-nut Type)

Rigid 

(Clutch Type)

1/4"

6.35

1.3

0.7

3/8"

9.52

1.6

1.0

1/2"

12.70

1.9

1.3

5/8"

15.88

2.2

1.7

3/4"

19.05

2.5

2.0

Figure II

Figure III

Figure IV

Spanner

Equivalent length for various fitting (meter)

Pipe Size

L joint

Trap bend

3/8" (OD9.52mm)

0.18

1.3

1/2" (OD12.7mm)

0.20

1.5

5/8" (OD15.9mm)

0.25

2

3/4" (OD19.1mm)

0.35

2.4

7/8" (OD22.2mm)

0.40

3

1" (OD25.4mm)

0.45

3.4

1 1/8" (OD28.6mm)

0.50

3.7

1 3/8" (OD34.9mm)

0.60

4.4

Notes: 
1. Equivalent piping length is obtained with actual length of gas piping.
2. 90° bend of piping is equivalent to L joint.

Bending must be carefully made so as not to crush the pipe. Use a pipe bender to bend a pipe where possible.

1 IM-5WMJR-0515(0)-DAIKIN SIESTA10   10

1 IM-5WMJR-0515(0)-DAIKIN SIESTA10   10

6/1/15   3:20:42 PM

6/1/15   3:20:42 PM