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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 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 outdoor 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 direction 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.
Outside Diameter
Capacity
Gas
18K BTU/h(50Hz)
5/8"
24K BTU/h
5/8"
30K/36K BTU/h
5/8"
42K/48K BTU/h
3/4"
60K BTU/h(50Hz)
3/4"
Firmly hold copper tube in a bar(or die) as
indicated dimension in the table above.
5) Check
Compare the flared work with figure.
If flare is noted to be defective, cut off
the flared section and do flaring work
again.
" A "
Liquid
Gas
Liquid
1/4"
0.8~1.0
0~0.5
1/4"
0.8~1.0
0~0.5
3/8"
0.8~1.0 0.5~0.8
3/8"
1.0~1.3 0.5~0.8
1/2"
1.0~1.3 0.5~0.8
Copper
tube
90°
Point down
Copper tube
Bar
"A"
Copper pipe
Clamp handle
Smooth all round
Inside is shining without scratches.
Inclined
Even length
all round
12
Slanted Uneven Rough
Pipe
Reamer
Flare nut
Handle
Bar
Yoke
Red arrow mark
= Improper flaring =
Surface
Cracked Uneven
damaged
thickness
Cone
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