Navien NFC-175 Installation & Operation Manual page 92

External Recirculation
When using the External Recirculation feature, you can choose
commands in the menu to preheat according to the set DHW
temperature.
Item
1. Always On
2. Intelligent*
3. Weekly*
4. Aquastat
5. HotButton
(Manual)
* To choose this option you must set up the Time settings in the
Configuration menu.
If there is a SH Demand signal during external
Note
recirculation, pre-heating will take priority, and space
heating will start afterwards.
92 Operating the Boiler
Description
Set to repeat DHW Recirculation.
Set to detect DHW use for a week and
repeat the detected cycle.
The user can choose commands for
DHW Recirculation on a weekly basis.
1. 1 Day: schedule a command for the
week.
2. 3 Day: schedule commands for
Weekdays, Saturdays, and Sundays.
3. 7 Day: schedule commands for each
day of the week.
Set to use an aquastat for DHW
Recirculation.
Set to use additional installations
(HotButton) for Recirculation.
When Installing the Cascade System
When using the recirculation feature in the cascade system , you
can choose commands in the menu to preheat according to the
set DHW temperature. (Refer to "8.2 Cascade System - Recirculation
System Application Example" for details on installing.)
For water heater(s) that are connected to the
Note
recirculation line, each unit must be set to the proper
recirculation mode.
Item
Set to repeat DHW Recirculation
1. Always On
(default).
The user can choose commands for
DHW Recirculation on a weekly basis.
1. 1 Day: Schedule a command for the
week.
2. Weekly*
2. 3 Day: Schedule commands for
Weekdays, Saturdays, and Sundays.
3. 7 Day: Schedule commands for each
day of the week.
* To choose this option you must set up the Time setting in the
Configuration menu.
Set the Weekly Schedule
When setting up the Weekly option, select 'Weekly, ' and select
between 1 Day, 3 Day, and 7 Day to go to the Schedule menu.
Working
Rotate the Command Dial (
can choose the time in 30 minutes intervals. To finalize the weekly
schedule settings, press and hold the Command dial (
than 2 seconds.
Description
Not working
) to choose the scheduled time. You
) for more