Navien NR-20DU Manual page 55

5
or
"S Ft" and the corresponding value are shown on
the LCD display.
S Ft will set the differential above the set
temperature for the designated unit in cascade
to stop providing hot water (0 is recommended).
S Ft settings can only be used when the
Note
storage tank is heated by a single unit.
Press the Up or Down button to adjust the value
by 1.
Press the OK button to finish the settings and exit
the settings.
Setting value ranges from 0 to the set
Note
temperature.