Navien NR-180 Installation Manual page 47

Navien Gas Water Heater Installation
Slave set-up
After the master set-up, push the SW3 and SW4 of slave 1 unit simultaneously for more than 3
seconds.
FND1 of the slave 1 unit will be changed to "S001".
Slave 2 unit also can be set-up as above.
After the slave set-up, each FND1 will be changed on the PCB as below:
Unit Master Unit
FND1
FND1 display: Slave set-up
Set-up finish
After the slave set-up, 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.
Master unit Change
It is always possible to change the master unit. After all units are powered off, choose one of the
units as the master unit and change the DIP SW2 (1st switch) according to master unit change.
Throughout communication set-up (Step 4) master unit change will be done.
Slave unit Addition/Removal
It is always possible to add or remove a slave unit. After all units are powered OFF, the
communication cable is added or removed on the PCB according to the slave unit being added or
removed.
There are two cases for system set-up.
Master unit change (recommended): Repeat 1. Step 1 and 2. Step 2, 3. Step 3.
Master unit unchanged: In this case, it is necessary to change the processing mechanism of the
master unit. The set-up procedures are as below:
Master unit set-up
To add or remove the slave unit, DIP SW1 and SW2 of the master unit PCB are changed as below:
Dip Switch 1
ON
1 2 3 4 5
DIP Switch set-up of the master unit PCB: Slave unit addition/removal
1st switch (DIP SW1) and 6-8th switch (DIP SW2) should be set to ON position.
After all unit power ON, push the SW3 and SW4 of the master unit simultaneously for more than 3 seconds.
Each FND1 will display on the PCB as below:
Slave 1 Unit
Dip Switch 2
ON
6 1 2 3 4
Slave 2 Unit
5 6 7 8
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