Navien NR-180 Installation Manual page 48

Gas Water Heater Installation
Unit
Master Unit
FND1
FND1 display: Master set-up (slave unit addition)
Slave unit set-up
This procedure is same as the 2.2 Slave set-up of the 3. Step 3: Communication set-up.
After the slave set-up, each FND1 will be changed on the PCB as below:
Unit Master Unit
FND
1
Set-up finish
After the slave set-up, DIP SW1 and DIP SW2 should be set to the original position and push the
SW3 and SW4 of the master unit simultaneously for more than 3 seconds.
All the FND will be changed to the setting temperature display and set-up procedures are finished.
Error display
In case of the error condition in the cascade system, a relevant error and unit are displayed on
the remote controller.
Error display example:
1) Error code 35 of the master unit
2) Error code 35 of the slave 1 unit
48
Slave 1 Unit Slave 2 Unit
Slave 1 Unit Slave 2 Unit
Error Code
Error Unit: Master
Error Code
Error Unit: Slave 1
Slave 3 Unit
Slave 3 Unit