Field Line Connection: Transmission Wiring And Cool/Heat Selection - Panasonic U-8ME3XPQ Manuel D'installation

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)
M8 (Power terminal block)
M8 (Ground)
M3 (Inter-unit wiring terminal block)
Precautions when connecting the ground
When pulling the ground wire out, wire it so that it comes
through the cut out section of the cup washer. (An
improper ground connection may prevent a good ground
from being achieved.)
1
2
3
1 2 3
U-8~16ME3XPQ
Urban Multi air conditioner
4PW16786-1C
1 Round pressure terminal
2 Power wire
5.5~7.3
0.8~0.97
Round pressure terminal
Cut out section
Cup washer
Field line connection: transmission wiring and cool/heat
selection
In case of U-8~16ME3 (See figure 19)
1 Outdoor unit
2 Outdoor unit PC board (A1P)
3 HR unit A
4 HR unit B
5 Last HR unit
6 Indoor unit
7 Remote controller
8 Cool-only unit
9 Use the conductor of sheathed wire (2 wire) (no polarity)
In case of U-18~48ME3 (See figure 10)
1 Unit A (Base unit)
2 Unit B
3 Unit C
4 To multi unit
5 To indoor unit
6 To outdoor unit
Fixing field line connection (See figure 17)
1 Fix to the indicated plastic brackets using field supplied clamping
material.
2 Wiring between the units (Outdoor - outdoor)
3 Wiring between the units (Indoor - outdoor)
4 Wiring for multi connection (only for U-18~48ME3)
5 Plastic bracket
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: 1000 m
Total wiring length: 2000 m
Maximum No. of branches: 16
Maximum number of outdoor units connectable: 10.
Up to 16 branches are possible for unit-to unit cabling.
No branching is allowed after branching. (See
figure 8)
1 Branch
2 Subbranching
Never connect the power supply to unit-to-unit cabling
terminal block. Otherwise the entire system may
break down.
Sequential start
Make the outdoor unit cable connections shown below.
The outdoor unit PC board (A1P) is factory set at "Sequential start
available".
For low-noise 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.
Installation manual
14