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22
CONNECTING PIPES
ENGLISH
-
Main cause of gas leakage is defect in flaring
work. Carry out correct flaring work in the
following procedure.
- Use the de-oxidised copper as piping
materials to install.
Cut the pipes and the cable.
- Use the accessory piping kit or the pipes
purchased locally.
- Measure the distance between the indoor and
the outdoor unit.
- Cut the pipes a little longer than measured
distance.
- Cut the cable 1.5 m longer than the pipe
length.
Burrs removal
- Completely remove all burrs from the cut
cross section of pipe/tube.
- Put the end of the copper tube/pipe to
downward direction as you remove burrs in
order to avoid to let burrs drop in the tubing.
Putting nut on
-
Remove flare nuts attached to indoor and
outdoor units, than put them on pipe/tube
having completed burr removal. (Not possible
to put them on after flaring work)
Flaring work
- Carry out flaring work using dedicated flaring
tool for R32 as shown below.
Firmly hold copper tube in a bar(or clamp) as
indicated dimension in the table above.
Check
- Compare the flared work with figure below.
- If flare is noted to be defective, cut off the
flared section and do flaring work again.
Inclined
Inside is shining without scratches.
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Flare nut
Copper tube
Pipe
Reamer
Point down
Copper
tube
90 °
Slanted Uneven Rough
Preparation of Piping
CONNECTING PIPES
Bar
Copper pipe
"A"
<Wing nut type>
<Clutch type>
Pipe diameter
Inch (mm)
A inch (mm)
Wing nut type Clutch type
Ø 1/4 (Ø 6.35)
0.04~0.05 (1.1~1.3)
0~0.02
(0~0.5)
Ø 3/8 (Ø 9.52)
0.06~0.07 (1.5~1.7)
Ø 1/2 (Ø 12.7)
0.06~0.07 (1.6~1.8)
Ø 5/8 (Ø 15.88)
0.06~0.07 (1.6~1.8)
Ø 3/4 (Ø 19.05)
0.07~0.08 (1.9~2.1)
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