Navien NR-20DU Manual page 54

3
or
"S FU" and the corresponding value are shown on
the LCD display.
Press the Up or Down button to adjust the value
by 1. (0 is recommended)
Press the OK button to switch to Operation
temperature settings mode.
Setting value ranges from 0 to the set
Note
temperature for S OU.
S Ot will set the differential below the set temperature for a single unit to initiate operation and provide recovery heat to
the tank. The unit will operate more frequently if the S Ot is set at a higher value (10 is recommended).
S Ot and S Ft settings can only be used when the storage tank is heated by a single unit.
Note
4
or
"S Ot" and the corresponding value are shown on
the LCD display.
Press the Up or Down button to adjust the value
by 1.
Press the OK button to switch to Stop temperature
settings mode.
Setting value ranges from 0 to the set
Note
temperature for S .