Navien NFC-175, Service Manual

Page: 40 / 138

40 NFC Service Manual
Version 1.0
External Recirculation
When using the External Recirculation feature, you can choose
commands in the menu to preheat according to the set DHW
temperature.
Item Description
1. Always on Set to repeat DHW Recirculation.
2. Intelligent*
Set to detect DHW use for a week and
repeat the detected cycle.
3. Weekly*
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.
4. Aquastat
Set to use an aquastat for DHW
Recirculation.
5. HotButton
(Manual)
Set to use additional installations
(HotButton) for Recirculation.
* To choose this option you must set up the Time settings in the
Configuration menu.
Note
If there is a SH Demand signal during external
recirculation, pre-heating will take priority, and space
heating will start afterwards.
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” in the Installation & Operation
Manual for details on installing.)
Item Description
1. Always on
Set to repeat DHW Recirculation
(default).
2. Weekly*
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.
4. Aquastat
Set to use an aquastat for DHW
Recirculation.
5. Manual
Set to use additional installations
(HotButton, On-demand kits) for
Recirculation.
* 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
Not working
Rotate the Command Dial ( ) to choose the scheduled time. You
can choose the time in 30 minutes intervals. To finalize the weekly
schedule settings, press and hold the Command dial ( ) for more
than 2 seconds.