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3. FLARING WORK AND PIPE CONNECTION
3-1. PRECAUTIONS FOR DEVICES THAT USE R410A REFRIGERANT
• U se C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses specified in
the table to the below. Make sure the insides of the pipes are clean and do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust.
Always apply no-oxidation brazing when brazing the pipes, otherwise, the compressor will be damaged.
WARNING:
When installing or relocating, or servicing the air conditioner, use only the specified refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any
other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specified for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case,
this could lead to a serious impediment to securing product safety.
Pipe size (mm)
ø6.35 ø9.52 ø12.7 ø15.88 ø19.05 ø22.2 ø25.4 ø28.58
Thickness (mm)
0.8
0.8
• D o not use pipes thinner than those specified above.
• Use 1/2 H or H pipes if the diameter is 19.05 mm or larger.
• B e sure to have appropriate ventilation in order to prevent ignition. Furthermore, be sure to carry out fire prevention measures that there are no dangerous or flammable
objects in the surrounding area.
3-2. FLARING WORK
1) Cut the copper pipe correctly with pipe cutter. (Fig. 1, 2)
2) Completely remove all burrs from the cut cross section of
pipe. (Fig. 3)
• Aim the copper pipe downward while removing burrs to
prevent burrs from dropping in the pipe.
3) Remove flare nuts attached to indoor and outdoor units,
then put them on pipe having completed burr removal. (Not
possible to put them on after flaring work.)
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the
dimension shown in the table. Select A inch (mm) from the
table according to the tool selected.
5) Check
• Compare the flared work with Fig. 6.
• If flare is noted to be defective, cut off the flared section
and do flaring work again.
Pipe diameter
B
[inch (mm)]
[inch (mm)]
1/4 (ø6.35)
21/32 (17)
3/8 (ø9.52)
7/8 (22)
1/2 (ø12.7)
1-1/32 (26)
5/8 (ø15.88)
1-5/32 (29)
en-5
0.8
1.0
1.0
1.0
1.0
Clutch type
A [inch (mm)]
Clutch type tool for R410A
Clutch type tool for R22
0 to 0.02
0.04 to 0.06
(0 to 0.5)
(1.0 to 1.5)
1.0
Good
Copper
pipe
Tilted Uneven Burred
Fig. 1
Flaring tool
Die
Flare nut
Wing nut type
Fig. 4
Wing nut type tool for R22
0.06 to 0.08
(1.5 to 2.0)
0.08 to 1.0
(2.0 to 2.5)
No good
Copper pipe
Burr
Spare reamer
Pipe cutter
Fig. 2
Inside is shin-
Smooth all
ing without any
scratches.
around
Copper pipe
Even length
all around
B
Fig. 5
Tightening torque
ft-Ib
N•m
10 to 13
13.7 to 17.7
25 to 30
34.3 to 41.2
36 to 42
49.0 to 56.4
54 to 58
73.5 to 78.4
Fig. 3
Fig. 6
kgf•cm
140 to 180
350 to 420
500 to 575
750 to 800
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