Panasonic U-72MF1U9 Technical Data Manual page 64

7. Optional Parts
Size of connection point on each part (Shown are inside diameters of tubing)
Size P a t r A
mm Ø 3 8 1 .
Inch 1 1 - 2 /
3. Making Branch Connections
Using a tube cutter,cut the joints at the diameter required to match the outside diameter of the tubing you are
connecting.
(This is usually done at the installation site.) The tube diameter depends on the total capacity of the indoor unit.
Note that you do not have to cut the joints if it already matches the tubing end size. For size selection of the tube
diameter, refer to the installation instructions provided with the outdoor unit.
NOTE
Avoid forceful cutting that may harm the shape of the joints or tubing.
(Inserting the tubing will not be possible if the tube shape is not proper.)
1
Cut off as far away from stopper as possible.
After cutting the joints,be sure to remove burrs on the inside of the joints.
(If the joints have been squashed or dented badly, reshaped them using a tube spreader.)
Make sure there is no dirt or other foreign substances inside the distribution joint.
2
The distribution joint can be either horizontal or vertical.
In the case of horizontal, the L-shaped tubing must be
slanted slightly upward (15° to 30°).
3
Outdoor unit
Side
4
In case of horizontal position
5
When brazing,replace air inside the tube with nitrogen gas to
prevent copper oxide from forming.
To insulate the distribution joint, use the supplied tubing
insulation.
6
(If using insulation other than that supplied, make sure
that its heat resistance is 248˚F or higher.)
For additional details, refer to the installation instructions
provided with the outdoor unit.
7
8
P a t r B P a t r C Part D
Ø 3 4 9 . 3 Ø 2 8 5 . 8 Ø25.4
1 1 - 4 / 1 1 - 8 / 1
Indoor unit
Side
15 to 30°
upward slant
P a t r E P a t r F Part G
Ø 2 2 2 . 2 Ø 1 9 0 . 5 Ø15.88
7 8 / 3 4 / 5/8
Stopper (boss)
In case of vertical position
(directed upward or downward)
2 - 50
Design of 3WAY VRF SYSTEM
P a t r H Part I
Ø 1 2 7 . Ø9.52
1 2 / 3/8
Cutting point
Make this as long as
possible.
Insertion length of the
connecting tube