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● Final 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.
Case 2
Auto Address Control for Multiple Linked Refrigerant System
How to Control Auto Address Setting from Outdoor Unit
1. Check that the refrigerant system address Rotary switch (SW2) on outdoor main unit control P.C. board in 1 refrigerant system is set to
"1" and the Dip switch (SW1) is set to "0" (at shipment).
2. Regarding the number of indoor units connected to the outdoor unit, set the Dip switch (SW3) for setting the number of indoor units on
outdoor main unit control P.C. board to "0"
Total of 9 units installation is made.
3. Turn ON power to all indoor and outdoor units only for one refrigerant system or disconnect link wires for multiple refrigerant system.
4. Short circuit the A.ADD pin 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 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.
5. 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 3.
● See the section "Auto Address Setting from Remote Controller".
ON
ON
OFF
1
2
ON
ON
and set the Rotary switch (SW4) to "9".
1
OFF
49
Between conductors
Wire
Wire
Between wiring and ground
Wire
Wire
Ground
Ground
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