Panasonic U-5ML5DPQ Installation Manual page 18

Precautions when laying power wiring
Use round pressure terminals for connections to the power
terminal block.
When none are available, follow the instructions below.
Do not connect wiring of different thicknesses to the
power terminal block. (Slack in the power wiring may
cause abnormal heat.)
When connecting wiring which is the same thickness,
do as shown in the figure below.
1 2
For wiring, use the designated power wire and
connect firmly, then secure to prevent outside
pressure being exerted on the terminal board.
Use an appropriate screwdriver for tightening the
terminal screws. A screwdriver with a small head will
strip the head and make proper tightening impossible.
Over-tightening the terminal screws may break them.
See the table below for tightening torque for the
terminal screws.
Tightening torque (N•m)
M5 (Power terminal block/ground wire)
M4 (Shielded ground)
M3.5 (Control wiring block)
Field line connection: Control wiring and cool/heat selection
If an excessive force is applied while connecting a cable to
the terminal block on the PC board, the PC board may be
damaged.
See figure 10.
1 Cool/heat selector
2 Outdoor unit PC board
3 Take care of the polarity
4 Use the conductor of sheathed wire (2 wire) (no polarity)
5 Terminal board (field supply)
Setting the cool/heat operation
1 Performing cool/heat setting with the remote controller
connected to the indoor unit.
Keep the cool/heat selector switch (DS1-1) on the outdoor unit
PC board at the factory setting position IN/D UNIT. (See
figure 11).
1 Remote controller
2 Performing cool/heat setting with the cool/heat selector.
Connect the cool/heat selector remote controller (optional) to the
A/B/C terminals and set the cool/heat selector switch (DS1-1) on
the outdoor unit PC board to OUT/D UNIT. (See figure 12).
1 Cool/heat selector
NOTE When the cool/heat selector is set to heat, you
cannot select cooling with the remote controller.
Installation manual
16
1 Round pressure terminal
2 Power wire
2.39~2.92
1.18~1.44
0.79~0.97
For low-noise operation or demand operation, it is
necessary to get the optional 'External control adaptor for
outdoor unit' (DTA104A61/62).
For details, see the installation manual attached to the
adaptor.
Be sure to follow the limits below. If the unit-to-unit
cables are beyond these limits, it may result in
malfunction of transmission.
Maximum wiring length: 300 m
Total wiring length: 600 m
Maximum No. of branches: 9
Up to 9 branches are possible for unit-to unit cabling.
No branching is allowed after branching. (See
figure 13).
1 Branch
2 Subbranching
Never connect the power supply to unit-to-unit cabling
terminal block. Otherwise the entire system may
break down.
The wiring from the indoor units must be connected to the F1/F2
(In-Out) terminals on the PC board in the outdoor unit.
After installing the interconnecting wires inside the unit, wrap
them along with the on-site refrigerant pipes using finishing
tape, as shown in figure 14.
1 Liquid pipe
2 Gas pipe
3 Interconnecting wiring
4 Insulator
5 Finishing tape
For the above wiring, always use vinyl cords with 0.75 to 1.25 mm
sheath or cables (2-core wires). (3-core wire cables are allowable for
the cooler/heater changeover remote controller only.)
2
U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1