10
Indoor Unit
Installation
Preparation of Piping
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. 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.
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.
Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure.
Pipe
" A "
Gas
Liquid
Gas
Liquid
<5.6(19,100)
1/2"
1/4"
0.5~0.8
0~0.5
<16.0(54,600)
5/8"
3/8"
0.8~1.0
0.5~0.8
<22.4(76,400)
3/4"
3/8"
1.0~1.3
0.5~0.8
Indoor unit
[kW(Btu/h]
Copper
tube
90
°
Slanted Uneven Rough
Pipe
Reamer
Point down
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 =
Precautions when connecting pipes
• See the following table for flare part machining dimensions.
• When connecting the flare nuts, apply refrigerant oil to the inside and outside of the flares and turn them three
or four times at first. (Use ester oil or ether oil.)
• See the following table for tightening torque.(Applying too much torque may cause the flares to crack.)
• After all the piping has been connected, use nitrogen to perform a gas leak check.
FLARE SHAPE and FLARE NUT TIGHTENING TORQUE
90
°
±
2
45
°
±
2
A
R=0.4~0.8
pipe size
tightening torque(Ncm)
A(mm)
flare shape
Ø6.35
1400~1600
8.7~9.1
Ø9.5
3270-3990
12.8-13.2
Ø12.7
4950-6030
16.2-16.6
Ø15.9
6180-7540
19.3-19.7
