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7MS-SVN015-EN
Connection of Refrigerant Tubing
The indoor unit refrigerant line
connections are flared both 50 Hz
and 60 Hz. Installation brazing, leak
testing, and evacuation of refrigerant
lines are covered in the Installer
Manual, packaged with the outdoor
unit. Read the instructions before
installing the refrigerant lines.
The indoor unit refrigerant piping
connections are located on the right
hand side when facing the unit
(Figure 11).
Connecting the unit with flaring
procedure.
(Only for MCX 512-536)
1. Flaring (If piping is procured or
cut at the site). Cut the copper
tube to the required length with
a tube cutter. It is recommended
to cut approx. 30-50 cm. longer
than the tubing length you
estimate.
2. Hold each pipe downward when
cutting and remove burrs at the
end of the copper tube with a
tube reamer or file. This process
is important and should be done
carefully to make a good flare
(Figure 12 and Figure 13).
Figure 11
Check if (L) is flared uniform
and is not cracked or scratched.
L Dimension:
1.4 to 1.7 mm (6.35 mm dia)
1.8 to 2.0 mm (9.53 mm dia)
1.9 to 2.2 mm (12.7 mm dia)
2.1 to 2.4 mm (15.88 mm dia)
When reaming, hold the tube end
downward and be sure that no
copper scraps fall into the tube.
3. Remove the flare nut from the
unit and be sure to mount it on
the copper tube.
4. Make a flare at the end of copper
tube with a flare tool (Figure
14, 15).
Copper
tubing
Reamer
Figure 12
Before After
Deburring
Figure 13
Flare tool
Flare nut
Copper
tubing
Figure 14
L
Figure 15
A good flare should have the
following characteristics:
- Inside surface is glossy and
smooth.
- Edge is smooth.
- Tapered sides are of uniform
length.
Bending
5. When bending the tube, be
careful not to crush it. To prevent
crushing of the tube, bend it
gently and do not bend the tube
at a radius curvature of less than
100 mm.
6. If the copper tube is bent or
pulled too often, it will become
stiff. Do not bend the pipe more
than three times at one place.
Cautions before
connecting tubes tightly
7. Be sure to apply a sealing cap or
water-proof tape to prevent dust
or water from getting into the
tubes before they are used.
8. Be sure to apply refrigerant
lubricant to the matching
surfaces of the flare and union
before connecting them
together. This is effective for
reducing gas leaks (Figure 16).
Apply refrigerant
lubricant here
Figure 16
MS-SVN015-EN.p65 6/27/07, 11:23 AM7
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