15
Dowel pin
Cutting location
Cut as far away as possible
(to ensure proper insertion
clearance for the connecting
tube)
Cutting is only necessary for the welding dimensions
at positions B, D, and F.
Vertical installation (directed upward or downward)
Example showing
tubing directed upward
Horizontal line
Horizontal line
Indoor unit side
Outdoor unit side
Install at a positive angle.
(15 – 30
°
)
Horizontal installation
1-7. Installing Distribution Joint Kit (for Twin &
Double-Twin) (K70A056Z)
●
Use a tube cutter and cut at the size position that
corresponds to the field-supply tube size selected
based on the total indoor unit capacity. (If the size is
the same as the tube end size, cutting is not neces-
sary.)
●
If the reducer that was supplied in the package is
used, perform brazing on-site.
Note: Do not cut in such a way that applies exces-
sive force and causes deformation of the
tube. (This will prevent insertion of the con-
necting tube.)
For size selection, refer to “Information for
the Person in Charge of Installation” and
other materials that were supplied with the
outdoor unit.
●
Cut at a position that is as far away as possible
from the dowel pin.
●
After cutting the tube, be sure to remove any burrs
and to finish the end surface correctly.
(If there is excessive crushing or indentation of the
tube, use a tube expander to expand it.)
●
Check that there is no dirt or other foreign sub-
stance inside the distribution tubing.
●
Install the distribution tubing so that it is either hori-
zontal or vertical.
●
Use the supplied thermal insulation to insulate the
distribution tubing.
(If other insulation is used, be sure to use insula-
tion that can withstand temperatures of at least
120°C.)
●
For details, refer to “Information for the Person in
Charge of Installation.”
Nitrogen gas replacement required for tube
brazing
If nitrogen replacement is not done when brazing is
performed on the indoor unit and outdoor unit refrig-
erant tubing, oxide scale will occur. This scale will
clog the solenoid valves, strainers, and other parts,
leading to malfunction.
Therefore be sure to replace the air in the tubing with
nitrogen when performing brazing in order to prevent
problems from oxide scale.
04-393 DC INV Tech p a-44 12/15/04 3:04 PM Page 15
