Flaring Work - Mitsubishi Electric MXZ-3A30NA Installation Manual

5-3

FLARING WORK

• Main cause of gas leakage is defect in flaring work.
Perform flaring work correctly in the following procedure.
1. Pipe cutting
• Cut the copper tube correctly with pipe cutter.
2. Burrs removal
• Completely remove all burrs from the cut cross
section of the pipe/tube.
• Put the end of the copper tube downward to
prevent burrs from dropping in the pipe/tube.
3. Putting nut on
• Remove flare nuts attached to indoor and out-
door units, then put them on pipe/tube having
completed burr removal.
(not possible to put them on after flaring work)
4. Flaring work
• Perform flaring work using flaring tool as shown
in the right.
Pipe diameter
mm (in.)
ø6.35 (1/4)
ø9.52 (3/8)
ø12.7 (1/2)
ø15.88 (5/8)
Firmly hold copper tube in a die in the dimension
shown in the table above.
5. Check
• Compare the flared work with the figure below.
• If flare is noted to be defective, cut off the flared
section and perform flaring work again.
A
in.
0.06 to 0.08
0.06 to 0.08
0.08 to 1.0
0.08 to 1.0
Good
Copper
Tilted Uneven Burred
90°
tube
Copper tube
Burr
Spare
reamer
Pipe cutter
Flare nut
Copper tube
Flaring tool
A
Die
Copper tube
Flare nut
Inside is shining without
Smooth all around any scratches
Even length
all around
No good
York
Die
Copper tube