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NRF-DL28R (for simultaneous Triple)
ø12.7
1
Liquid distribution joint
for liquid tube
ø9.52
ø6.35
ø9.52
ø12.7
3
1
Liquid-tube side tube
connector
1
Thermal insulation
Thermal insulation
for liquid distribution
for gas distribution
joints
joints
1-7. Installing Distribution Joint Kit (for Twin &
Double-Twin) (NRF-DL16R & NRF-D1668R)
● For branching tubes, install 150 mm or longer (including
reducer) straight tubing up to the point where the tube
branches (or after the point where the tubes join together).
150 mm or longer straight tubing up
● 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 necessary.)
● 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 excessive force
and causes deformation of the tube. (This will prevent
insertion of the connecting tube.)
Big_PAC_eng.indb 12
Big_PAC_eng.indb 12
100
1
Dowel pin
5
position
4
2
3
1
2
B-
6
CUP3
3 locations
ø25.4
1
Gas distribution joint
for gas tube
ø19.05
ø12.7
ø25.4
ø15.88
3
1
Gas-tube side tube
connector
ø28.58
ø19.05
ø15.88
ø25.4
2
1
1
Gas-tube side tube
connector
Unit: mm
● Cut at a position that is as far away as possible from the
dowel pin.
If the distribution joint will be cut before use,
cut on the line marked "cutting location" in the figure below.
Dowel pin
Cutting location
Cut as far away as possible
(to ensure proper insertion
clearance for the connecting tube)
● 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 substance inside
the distribution tubing.
● Install the distribution tubing so that it is either horizontal or
vertical. In the case of horizontal, the L-shaped tubing must
be slanted slightly upward (15° to 30°).
● Use the supplied thermal insulation to insulate the
distribution tubing.
(If other insulation is used, be sure to use insulation that can
withstand temperatures of at least 120°C.)
Horizontal Installation
Outdoor unit side
Vertical installation (directed upward or downward)
Example showing
tubing directed upward
Nitrogen gas replacement required for tube brazing
If nitrogen replacement is not done when brazing is performed
on the indoor and outdoor unit refrigerant 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.
12
Horizontal line
Indoor unit side
Install at a positive angle.
(15 – 30°)
Horizontal line
2009/08/26 16:33:09
2009/08/26 16:33:09
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