1. Preparation
Before addressing:
Determine a clear addressing plan — e.g., by floor, zone, or refrigerant circuit.
Confirm wiring is complete and correct between transmission cables and outdoor units (OUs).
Ensure all OUs are powered OFF before adjustment.
2. Refrigerant Address Setting (REF AD)
Each refrigerant circuit requires a unique address (00–99) when multiple outdoor units are connected to the same communication line.
Procedure:
Locate the Rotary Switches (REF AD x10 / REF AD x1) on the Outdoor PCB.
Set the address using the following format:
REF AD x10 sets the tens digit.
REF AD x1 sets the ones digit.
Example settings:
| Refrigerant Circuit Address | REF AD x10 | REF AD x1 |
|---|---|---|
| 01 | 0 | 1 |
| 11 | 1 | 1 |
| 25 | 2 | 5 |
| 50 | 5 | 0 |
Setting range: 00–99
Each outdoor system (refrigerant circuit) must have a unique REF address.
3. Outdoor Unit Address Setting (SET3 Switch)
When multiple outdoor units are connected to one refrigerant system, each must have a unique Outdoor Unit Address (Master / Slave).
DIP Switch (SET3-1, SET3-2):
| SET3-1 | SET3-2 | Address | Function |
|---|---|---|---|
| OFF | OFF | 0 | Primary (Master) – Factory default |
| OFF | ON | 1 | Subordinate Unit 1 (Slave 1) |
| ON | OFF | 2 | Subordinate Unit 2 (Slave 2) |
| ON | ON | - | Prohibited |
Note:
Only one master per refrigerant system.
Up to two slave units may be connected to the same refrigerant circuit.
4. Number of Slave Units (Master Unit Only)
For the Master Outdoor Unit, configure the number of subordinate units connected using SET3-3 and SET3-4.
| SET3-3 | SET3-4 | Description |
|---|---|---|
| OFF | OFF | Primary only (no slaves) |
| OFF | ON | 1 Slave unit connected |
| ON | OFF | 2 Slave units connected |
| ON | ON | Prohibited |
5. Number of Outdoor Units in System (SET5 Switch)
All outdoor units (master and slaves) must be configured for the total number of outdoor units in the refrigerant system using SET5-1 and SET5-2.
| SET5-1 | SET5-2 | No. of Outdoor Units | Remarks |
|---|---|---|---|
| OFF | OFF | 1 | Factory default |
| OFF | ON | 2 | Dual-unit combination |
| ON | OFF | 3 | Triple-unit combination |
| ON | ON | - | Prohibited |
6. Example Configurations
Single Outdoor Unit System
REF AD = 00
SET3-1 = OFF, SET3-2 = OFF (Master)
SET3-3 = OFF, SET3-4 = OFF (No slaves)
SET5-1 = OFF, SET5-2 = OFF (1 unit)
Two Outdoor Unit System
Master:
REF AD = 01
SET3-1 = OFF, SET3-2 = OFF
SET3-3 = OFF, SET3-4 = ON (1 slave connected)
SET5-1 = OFF, SET5-2 = ON
Slave 1:
REF AD = 01
SET3-1 = OFF, SET3-2 = ON
SET5-1 = OFF, SET5-2 = ON
Three Outdoor Unit System
Master:
REF AD = 02
SET3-1 = OFF, SET3-2 = OFF
SET3-3 = ON, SET3-4 = OFF (2 slaves connected)
SET5-1 = ON, SET5-2 = OFF
Slave 1:
REF AD = 02
SET3-1 = OFF, SET3-2 = ON
SET5-1 = ON, SET5-2 = OFF
Slave 2:
REF AD = 02
SET3-1 = ON, SET3-2 = OFF
SET5-1 = ON, SET5-2 = OFF
7. Final Verification
Power ON the system and confirm all outdoor units display correct addressing through commissioning tools or display LEDs.
Ensure no duplicate REF or OU addresses exist on the same communication line.
After confirmation, proceed with indoor unit (I.U.) addressing and system initialization.