CONNECTING PIPES
Preparation of Piping
Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following
procedure.
Cut the pipes and the cable.
- Use the accessory piping kit or the pipes pur-
chased locally.
- Measure the distance between the indoor
and the outdoor unit.
- Cut the pipes a little longer than measured
distance.
- Cut the cable 1.5m 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 down-
ward 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 R-410A as shown below.
Outside diameter
mm
inch
Ø6.35
Ø9.52
Ø12.7
Ø15.88
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.
CONNECTING PIPESINSTALLATION OF INDOOR, OUTDOOR UNIT
"A"
mm
1/4
1.1~1.3
3/8
1.5~1.7
1/2
1.6~1.8
5/8
1.6~1.8
Copper
Slanted Uneven Rough
tube
90°
Pipe
Point down
Flare nut
Copper tube
Bar
Bar
"A"
Copper pipe
Clamp handle
Smooth all round
Inside is shining without scratches.
= Improper flaring =
Inclined
Surface
damaged
Even length
all round
11
Reamer
Handle
Yoke
Cone
Red arrow mark
Cracked Uneven
thickness