–19–
• Preparation of Piping
6. Connecting Pipes to the Indoor Unit
Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure.
1) Cut the pipes and the cable.
■
Use the accessory piping kit or the pipes purchased
locally.
■
Measure the distance between the indoor and the out-
door unit.
■
Cut the pipes a little longer than measured distance.
■
Cut the cable 1.5m longer than the pipe length.
2) Burrs removal
■
Completely remove all burrs from the cut cross section
of pipe/tube.
■
Put the end of the copper tube/pipe to downward direc-
tion as you remove burrs in order to avoid to let burrs
drop in the tubing.
3) 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)
4) Flaring work
■
Carry out flaring work using flaring tool as shown below.
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
5) 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.
Outside diameter
A
mm
inch
mm
Ø6.35
3/8
0.5~0.8
Ø9.52
3/8
0.5~0.8
Ø12.7
1/2
0.5~0.8
Ø15.88
5/8
0.8~1.0
Ø19.05
3/4
1.0~1.3
Copper
tube
90
°
Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shining without scratches
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
