Sterling SDF 250 - Manual (Page 23)

SDF 250/400/500
Start up 3-9
Enter for each day the switching on time and the
switching off time in hours and minutes.
Off / Internal / External
Select operation mode:
”internal” = operation with internal timer,
“external” = operation with external timer (if
present),
”off” = operation without timer.
&
The timer is only operating,
when the dryer is switched
on.