Connecting The Communication Cables - Navien NFC-250/175H Installation Manual

8.3 Connecting the
Communication Cables
You can connect one NFC-H boiler with up to 15
Navien water heaters (NPE-A2 or NPE-S2 Model),
using the Ready-Link communication cables. Select
the NFC-H 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-H Boiler Connection Method
Connect the Ready-Link cables to the CNK1 terminal
strip:
SUPPLY RETURN OUTDOOR T/S_ZONE3
TEMPERATURE SENSOR R C
W
NPE-A2 Water Heater Connection
Method
Connect the Ready-Link cables to the J6 ports on
the right side of the front panel:
86 Installing a Cascade System
lLWCO
AC24VL
AC24VN
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-H boiler panel, press the
Back button ( ) and the Menu button (
simultaneously for 3 seconds, and then select
"4. Cascade Status and Set".
2. Rotate the Command dial (
between the parameters or to increase/decrease
setting values. Press the Command dial (
to select "1. Cascade System Setting", and then
select "START".
).
)
) to switch
)