Navien NR-180 Installation Manual page 46

Gas Water Heater Installation
-The diagram above displays the master unit and slave unit connected with the ready link
communication cable.
- The Dip SW6(KDC-324-xM PCB Board), which is used only for organizing cascade system, Be
switched ON if the corresponding unit is the first or the last unit of Cascade connection.
CN7
-The recommended location for the master unit is in the center.
Step 4: Communication set-up
After the cable connections and DIP switch set-up, the communication set-up should be done.
Master set-up
After the power ON, each FND1 will display on the PCB as below:
Unit Master Unit
FND1
FND1 display: Master set-up
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CN12
CN9
OFF
ON
Dip S/W 6
Slave 1 Unit
FND 1
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
Dip S/W 1 Dip S/W 2
Slave 2 Unit
7 8