Navien NFC-250/175H Installation Manual page 87

3. On the sub NPE-A2 water heater panel, press
and hold the OK button (
the sub unit. Then, the ID 1. Allocated! message
will appear on the sub unit's front panel display.
When the water heater is set to a sub unit, the
icon will appear on the display.
4. Repeat step 3 to configure the rest of the sub
water heaters in the system.
5. On the main NFC-H boiler panel, press the
Command dial ( ) button when the following
screen appears. All the display screens on the
configured water heaters will return to the
temperature display.
To add additional sub water heater
Note
●
at a later time, repeat step 3.
To cancel the cascade
●
communication settings, on the
main NFC-H boiler panel, press the
Back button (
button (
3 seconds, and then select
"4. Cascade Status and Set". Then,
select "2. Cascade System Removal"
and select "YES". The water heaters
will revert to independent operation.
To reassign the main NFC-H boiler,
repeat steps 1-5.
) for 3 seconds on
) and the Menu
) simultaneously for
Installing a Cascade System 87