14
Refrigerant pipe connection
step 5: installation of Connection Pipe
Copper tube
Flare nut
1 Flaring work
Main cause for refrigerant leakage is due to
defects in the flaring work. Carry out correct flaring
work using the following procedure:
A:
Cut the pipes and the cable.
• Use the piping kit accessory (if applicable) or
pipes purchased locally.
• Measure the distance between the indoor and
the outdoor unit.
• Cut the pipes a little longer than the measured
distance.
• Cut the cable 1.5m longer than the pipe length.
It is not possible to put them on after flaring work.
D: Flaring work.
• Carry out flaring work using flaring tool as
shown below.
Handle
bar
bar
Yoke
Cone
Pipe
Copper pipe
Clamp handle
Red arrow mark
• Firmly hold copper pipe in a die according to
the dimension shown in the table below.
Oblique Roughness
burr
B: Burr removal
• Completely remove all burrs from the cut
cross section of pipe/tube.
• Face the end of the copper pipe/tube in a
downward direction as you remove burrs in
order to avoid burrs dropping into the tubing.
E: Check
• Compare the flare work with the adjacent
diagram.
• If the pipe has any defect, cut off the enlarged
section and redo the work.
Pipe
Smooth all around
Face down
Reamer
Improper flaring
Inclined
Cracked
Damaged
surface
Uneven
thickness
Even length all
around
C: Putting flare nut on
• Remove flare nuts attached to indoor and
outdoor unit, then put them on pipe/tube
having completed burr removal.
• Make an independent covering for each
pipe with the appropriate tubular isolation.
caution
Outer diam. (mm)
A (mm)
Max.
Min.
Ф6.35 (1/4”)
1.3
0.7
Ф9.52 (3/8”)
1.6
1.0
Ф12.70 (1/2”)
1.8
1.0
Ф15.88 (5/8”)
2.4
2.2
