Refrigerant Piping; Preventing Foreign Objects From Entering; Cautions For Handling Stop Valve - Panasonic URBAN MULTI Manuel D'installation

NOTE You must use a torque wrench but if you are obliged to
install the unit without a torque wrench, you may follow
the installation method mentioned below.
After the work is finished, make sure to check that
there is no gas leak.
When you keep on tightening the flare nut with a
spanner, there is a point where the tightening torque
suddenly increases. From that position, further tighten
the flare nut within the angle shown below:
Further tightening
Pipe size
Ø9.5 (3/8")
Ø15.9 (5/8")
Ø19.1 (5/8")
9. R
EFRIGERANT PIPING
Field pipes can be installed in four directions.
Figure - Field pipes in four directions (See figure 5)
1 Drill
2 Center area around knockout hole
3 Knockout hole
4 Slit
5 Connecting pipe liquid (field supply)
6 Bottom frame
7 Front plate
8 Pipe outlet plate
9 Screw front plate
10 Pipe outlet plate screw
11 Connecting pipe gas (field supply, except U-6ML4)
A Forward
B Backward
C Sideways
D Downward
When connecting the piping in the lateral direction (on the rear),
remove the piping cover (rear) in reference to figure 7.
1 Piping cover (rear)
To install the connecting pipe to the unit in a downward direction,
make a knockout hole by penetrating the center area around the
knockout hole using a Ø6 mm drill. (See figure 5).
Cutting out the two slits makes it possible to install as shown in
figure 5.
(Use a metal saw to cut out the slits.)
After knocking out the knock-out, it is recommended to apply
repair paint to the edge and the surrounding end surfaces to
prevent rusting.
U-4~6ML4DPQ
Urban Multi air conditioner
4PW29037-1
Recommended
angle arm length of tool
60~90° ±200 mm
30~60° ±300 mm
20~35° ±450 mm
For U-6ML4 only
The size of the gas side stop valve is Ø15.9 while the inter-unit piping
is Ø19.1. Use the standard supplied accessory piping to make the
connection. See figure 15.
A Front connection
B Rear connection
C Side connection
D Bottom connection
1 Gas line piping + copper gasket supplied with the unit (make sure
to always use the copper gasket).
2 Gas line piping supplied with the unit
3 Gas piping (field supply)
4 Cut to the appropriate length.
5 Gas line piping supplied with the unit

9.1. Preventing foreign objects from entering

Plug the pipe through-holes with putty or insulating material (field
supply) to stop up all gaps, as shown in the figure.
1
Insects or small animals entering the outdoor unit may cause a short
circuit in the electrical box.

9.2. Cautions for handling stop valve

The stop valves for indoor-outdoor connecting piping are closed
at shipment from the factory.
Make sure to keep the valve open during operation.
The names of parts of the stop valve are shown in the figure.
1
2
3
4
Since the side boards may be deformed if only a torque wrench
is used when loosening or tightening flare nuts, always lock the
stop valve with a wrench and then use a torque wrench.
Do not place wrenches on the valve cover.
1 Spanner
2 Torque wrench
Do not apply force on the valve cover, this may result in a
refrigerant leak.
1 Putty or insulating material (field
supply)
1 Service port
2 Stop valve
3 Field piping connection
4 Valve cover
2
Installation manual
7