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5.2 Preparation of Piping
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-
side 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) Flaring work
Carry out flaring work using flaring tool as shown below.
Pipe
Indoor unit
[kW(Btu/h]
Gas
≤5.6(19,100)
Ø12.7
<16.0(54,600) Ø15.88
≤22.4(76,400) Ø19.05
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
4) 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.
9
9
[Unit:mm]
" A "
Liquid
Gas
Liquid
Ø6.35
1.6~1.8 1.1~1.3
Ø9.52
1.6~1.8 1.5~1.7
Ø9.52
1.9~2.1 1.5~1.7
Copper
Slanted Uneven Rough
tube
90°
Pipe
Point down
Bar
Bar
"A"
Copper pipe
Clamp handle
Smooth all round
Inside is shining without scratches.
= Improper flaring =
Inclined
Surface
damaged
Even length
all round
Reamer
Handle
Yoke
Cone
Red arrow mark
Cracked Uneven
thickness
Installation
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