Schwank ThermoControl Plus 2 - Manual (Page 13)

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4.4.2 How to clear a switch point
The numeric of a switch point is not fixed. If a switch point is deleted the numbers of the remaining
points will be reassigned so that there is no chance of gaps in the time program.
4.4.3 How to clear a whole time program
4.4.4 How to protect the time program
The function of the time program is based on the clock and calendar data.
The clock is supplied by a battery (1.5 V AA). A warning signal
shows, when the battery needs
replacement. For a 2 minute period while changing the battery, the exact time and date will remain
intact.
In case the control-unit is not used for a long time, including a complete discharge of the batteries,
the time and date will require confirmation of correctness or resetting after a battery change.
The saved switch points are independent of the battery. The program is saved on a secured
EEPROM-memory . Time programs cannot be lost as a consequence of a battery change or
discharge.
To clear a whole time program
push and hold the CLR button
while the number of free spaces
are shown in the display (FrEE).
The symbol CLR will start to
blink as a warning. If the CLR
button is released immediately,
then the erasure procedure will
be stopped.
If the erasure is completed
horizontal lines are visible. Then
the new number of free switch
points is displayed.(19).
To clear or erase a switch time
point: select the point, push and
hold the CLR button. The
symbol CLR will blink in the
display, warning that a switch
time point is to be cleared. If the
CLR button is released
immediately, then the erasure
procedure will be stopped.
If the erasure is completed
horizontal lines are visible. Then
the new number of free switch
points is displayed.