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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.
I Use the accessory piping kit or the pipes purchased
locally.
I Measure the distance between the indoor and the out-
door unit.
I Cut the pipes a little longer than measured distance.
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 downward direc-
tion as you remove burrs in order to avoid to let burrs
drop in the tubing.
3. Flaring work
I Carry out flaring work using flaring tool as shown below.
Indoor unit
Pipe
[kW(Btu/h]
Gas
<5.6(19,100)
1/2"
<16.0(54,600)
5/8"
<22.4(76,400)
3/4"
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
4. 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.
" A "
Liquid
Gas
Liquid
1/4"
0.5~0.8
0~0.5
3/8"
0.8~1.0 0.5~0.8
3/8"
1.0~1.3 0.5~0.8
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
Installation Manual 9
Installation
Reamer
Handle
Yoke
Cone
Red arrow mark
Cracked Uneven
thickness
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