Connecting The Communication Cables - Navien NFC-175 Installation & Operation Manual

8.3 Connecting the Communication Cables

You can connect one NFC boiler with up to 15 Navien water
heaters (NPE Model), using the Ready-Link communication cables.
Select the NFC series combi-boiler in the cascading system as the
main unit, and then connect the water heaters to it as sub units.
Before making any connections, ensure that the power is turned
off to all the units.
NFC Boiler Connection Method
Connect the Ready-Link cables to the CNK1 terminal strip:
SUPPLY RETURN OUTDOOR T/S_ZONE3
TEMPERATURE SENSOR R
NPE Water Heater Connection Method
Connect the Ready-Link cables to the J6 ports on the right side of
the front panel:
lLWCO
AC24VL
AC24VN
W C
8.3.1 Connecting the Communication
After connecting the Ready-Link communication cables, restore
power to the boiler and turn on all boilers using the Power button.
To configure the communication settings:
1. On the main NFC boiler panel, press the Back button (
the Menu button ( ) simultaneously for 3 seconds, and then
select "4. Cascade Status and Set".
2. Rotate the Command dial (
parameters or to increase/decrease setting values. Press the
Command dial ( ) to select "1. Cascade System Setting", and
then select "START".
) and
) to switch between the
Installing a Cascade System 67