Navien CH-180 Installation Manual page 53

2. Step 2: Cable connection and DIP switch change
A multiple unit, which is composed of 1 combination Water Heater / Heating Boiler
and up to 15 Water Heater can be connected by using Naviens' Multi-Link
communication cables inside.
The combination Water Heater / Heating Boiler shall be set as a master unit, which
can be done by switching the 1st switch of DIP SW2 on. All Water Heater / Heating
Boilers shall be set as slave units, which also can be done by switching the 1st
switch of DIP SW2 off. (as shown in the figure below)
During step 2, the power supply should be OFF.
Cable connection and DIP switch set-up
-cascade communication cable PCB connecting adapter PCB CN9 port.
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