2. Guideline for each installation process
7
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Heat pump 50Hz/R410A
Part 3 Design and installation
2.2.2 Flaring work
Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the following procedure.
Copper
tube
90°
Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
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 =
1) Cut the pipes and the cable.
①
Use the piping kit accessory or the pipes purchased locally.
②
Measure the distance between the indoor and the outdoor
unit.
③
Cut the pipes a little longer than measured distance.
④
Cut the cable 1.5m longer than the pipe length.
2) Burrs removal
①
Completely remove all burrs from the cut cross section of
pipe/tube.
②
Put the end of the copper tube/pipe in a downward direction
as you remove burrs in order to avoid dropping of burrs into
the tubing.
3) Putting nut on
①
Remove flare nuts attached to indoor and outdoor unit, then
put them on pipe/tube having completed burr removal.(not
possible to put them on after flaring work)
4) Flaring work
①
Carry out flaring work using flaring tool as shown below.
②
Firmly hold copper pipe in a die in the dimension shown in the
table below.
5) Check after flaring
①
Compare the flared work with figure on right side.
②
If flare is found to be defective, cut off the flared section and
do flaring work again.
Outer diameter
A
mm
inch
mm
Ø6.35
1/4
1.1~1.3
Ø9.52
3/8
1.5~1.7
Ø12.7
1/2
1.6~1.8
Ø15.88
5/8
1.6~1.8
Ø19.05
3/4
1.9~2.1
