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3. Connecting Pipes to the Indoor Unit
3-1. Preparation of Piping
Main cause of gas leakage is defect in flaring work.
Carry out correct flaring work in the following proce-
dure.
1) Cut the pipes and the cable.
I Use the accessory piping kit or the pipes pur-
chased locally.
I Measure the distance between the indoor and
the outdoor unit.
I Cut the pipes a little longer than measured dis-
tance.
I Cut the cable 1.5m longer than the pipe length.
2) Burrs removal
I Completely remove all burrs from the cut cross
section of pipe/tube.
I 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.
3) Putting nut on
I Remove flare nuts attached to indoor and out-
door units, than put them on pipe/tube having
completed burr removal.
(Not possibe to put them on after flaring work)
4) Flaring work
I Carry out flaring work using flaring tool as
shown below.
Outside diameter
mm
inch
Ø12.7
1/2
Ø15.88
5/8
Firmly hold copper tube in a die as indicated dimen-
sion in the table above.
5) Check
I Compare the flared work with figure below.
I If flare is noted to be defective, cut off the flared
section and do flaring work again.
Copper
tube
Bar
A
mm
0 ~ 0.5
0 ~ 1.0
Smooth all round
Even length
all round
–30–
Slanted Uneven Rough
90°
Pipe
Reamer
Point down
Flare nut
Copper tube
Handle
Bar
"A"
Copper pipe
Clamp handle
Red arrow mark
Inside is shining without scratches
= Improper flaring =
Inclined
Surface
Cracked Uneven
damaged
Yoke
Cone
thickness
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Troubleshooting
