If Link Wiring Is Used; Final Check - Panasonic U-8ME1E81 Service Manual

3. Auto Address Setting
3. Auto Address Setting

If link wiring is used

Short-circuit 2 termination resistors plug (remains unchanged at shipment).
In order to stabilize communication, 2 short circuit locations shall be at both sides (remains unchanged at shipment).
Setting of terminal plug (CN67)
Refrigerant circuit No.
Unit No. 1 (Main)
Unit No. 2 (Sub)
Unit No. 3 (Sub)
Centralized
control
system
No. 1
Refrigerant
circuit
No. 2
Refrigerant
circuit
2
3 No. n
Refrigerant
circuit
4

Final Check

5
Be sure to check before operation.
Final check must be done under the conditions of inter-outdoor unit control wiring
connected to the centralized control system and the resistor between conductors
must be measured by a Megger. Check if it is showing between 30Ω and 120Ω.
6 If the resistance value is out of range, check adjustment of the termination resistor again.
Even if it is out of range, the problem is caused by wiring.
• Is the wiring connection properly completed?
• Are there any scratches or deterioration on the coverage?
• Measure between conductors and also between wiring and ground by 500V Megger
7
insulation resistance tester. Make sure the Megger is showing more than 100MΩ.
When measuring, remove both ends of the wiring from the terminal board.
If not removed, it will be damaged. If it is less than 100MΩ, a new wiring connection
should be made.
8
No. 1
short-circuit (at shipment)
short-circuit (at shipment)
short-circuit (at shipment)
Leave the socket that is
Unit
Outdoor unit
used to short-circuit the
No. 1
system 1
terminal plug.
(Main)
(CN67)
Inter-outdoor unit control wiring
1-1
Indoor unit
Remote
controller
Unit
Outdoor unit
Move the sockets to the
No. 1
system 2
"OPEN" side. (CN67)
(Main)
Inter-outdoor control wiring
2-1
Indoor unit
Remote
controller
Leave the socket that is
Unit
Outdoor unit
used to short-circuit the
No. 1
system n
terminal plug.
(Main)
(CN67)
Inter-outdoor unit control wiring
Indoor unit n-1
Remote
controller
No. 2 to n-1
open-circuit
short-circuit (at shipment)
short-circuit (at shipment)
Unit
No. 2
(Sub)
Inter-outdoor unit control wiring
Inter-unit control wiring
1-2 1-3
Remote control
communication wiring
Unit
No. 2
(Sub)
Inter-outdoor unit control wiring
Inter-unit control wiring
2-2 2-3
Remote control
communication wiring
Unit
No. 2
(Sub)
Inter-outdoor unit control wiring
Inter-unit control wiring
n-2 n-3
Remote control
communication wiring
1-11
2WAY SYSTEM
3WAY SYSTEM
Address Settings
Address Settings
No. n
short-circuit (at shipment)
short-circuit (at shipment)
short-circuit (at shipment)
Unit
No. 3
(Sub)
1-10
Unit
No. 3
(Sub)
2-10
Unit
No. 3
(Sub)
n-10
Between conductors
Wire
Wire
Between wiring and ground
Wire
Wire
Ground Ground
1
2
3
4
5
6
7
8