Panasonic U-120ME2U9 Service Manual page 193

5. Auto Address Setting
F
inal 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.
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
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.
Make settings according to each case as described below.
• In case of possibility of turning ON power to indoor/outdoor units for each refrigerant system
• In case of impossibility of turning ON power to indoor/outdoor units for each refrigerant system
Auto address setting in heating mode
Auto address setting in cooling mode
In case of possibility of turning ON power to indoor/outdoor units for each refrigerant system:
Case 2
In case of possibility of turning ON power to indoor/outdoor units for each refrigerant system:
Indoor unit address setting can be made without starting the compressor.
How to control auto address setting from outdoor unit
1. Set the unit number setting switch (SW5) on unit 1 (outdoor main unit) control P.C. board to:
(Unit 1: This unit becomes to the outdoor main unit.)
Set the unit number setting switch (SW5) on unit 2 control P.C. board to:
Set the unit number setting switch (SW5) on unit 3 control P.C. board to:
2. Regarding the number of outdoor units, set the Dip switch (SW6) for setting the number of outdoor units on outdoor main unit
control P.C. board to 3 units.
3. Check that the refrigerant system address Rotary switch (SW1) on outdoor main unit control P.C. board in 1 refrigerant system is
set to "1" and the Dip switch (SW2) is set to "0" (at shipment).
4. Regarding the number of indoor units connected to the outdoor unit, set the Dip switch (SW4) for setting the number on indoor
units on outdoor main unit control P.C. board to "1"
Total of 13 units installation are made.
5. Turn ON power to all indoor and outdoor units in one refrigerant system.
6. Short circuit the A.ADD pin (CN30) of outdoor main unit for over 1 second long and then open circuit.
(Communication for auto address setting begins.)
* To cancel, again short circuit the A.ADD pin (CN30) for over 1 second long and then open circuit.
LEDs 1 and 2 that indicate auto address setting is in progress go out and that process is stopped.
Be sure to perform auto address setting again.
(Auto address setting is completed when the compressor stops and LEDs 1 and 2 on outdoor main unit control P.C. board go out.)
7. Turn ON power to indoor and outdoor units only for another refrigerant system and repeat steps 1 to 5 described above.
Complete auto address setting for each refrigerant system.
8. Remote control operation is now available.
* When performing auto address setting by the remote controller, perform auto address setting by the remote controller after
step 5.
Refer to section "Auto Address Setting from Remote Controller."
ON
ON
1 2 3
OFF
ON
1 2 3
6 - 11
ON
1 2 3
ON
1 2 3
ON
ON
1 2
OFF
ON
and set the Rotary switch (SW3) to "3".
OFF
48
2WAY VRF SYSTEM
Test Run
Between conductors
Wire
Wire
Between wiring and ground
Wire
Wire
Ground Ground
Case 2
Case 3.a
Case 3.b
ON
1 2 3
1
2
3
4
5
6
7
8
9