12
Overriding the programe using the Pre-
Selector wheel
The pre-selector wheel can be used
to override the set programme on
occasions when you need to change
from your normal heating routine.
By turning the wheel anti-clockwise
you can turn the unit ON when it is OFF
and vice versa.
Example:
Your programme is set so that your heating comes on at
4pm but you arrive home earlier than usual, at 2pm and
need the heating ON immediately.
Turn the wheel anti-clockwise until it displays ON UNTIL `D’
as shown.
Thus the system is turned ON manually at 2pm but will
revert to the set programme at the next operation (i.e. OFF
at 11pm)
Some other useful pre-selections are:
ALL DAY ON (1 ON/1 OFF)
Turn the Wheel to display “ON UNTIL D”.
ALL DAY OFF
Turn the Wheel to display “OFF UNTIL A”.
Note: Do not operate the pre-selector whilst a tappet is close
to the TIME mark. This may cause the time of day setting of the
clock to be altered, and the time would then need to be reset as
shown on page 9.
!
Some other useful pre-selections are
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