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OPERATING YOUR ST9120C
Choosing the Operating Mode
The operating mode may only be changed when the slider is set to the RUN position.
The symbol is displayed during a programmed on period. A green INDICATOR
LAMP shows when the system is switched ON.
A MODE button is provided to select the Operating Mode and therefore how the
system is controlled.
There are four possible Operating Modes; these are OFF, AUTO, ONCE, CONT.
Pressing the MODE button scrolls round these modes in sequence, and the display
indicates which mode is currently active.
• OFF mode
The system will remain OFF.
• AUTO (Automatic) mode
The system will be switched ON and OFF according to the programme.
• ONCE mode
The system will come ON at the first programmed ON time, and go OFF at the
last programmed OFF time.
• CONT (Continuous) mode
The system will remain ON continuously.
Overriding the Operation Without Changing the Programmes
In AUTO and ONCE operating modes, the OVERRIDE button switches the hot water
ON or OFF without altering the programme.
When the symbol is displayed, pressing the OVERRIDE button switches the
system OFF until the next programmed ON time.
If the symbol is not displayed, pressing the OVERRIDE button switches the
system ON until the next programmed OFF time.
The LoT™ Display will provide you with information about the override.
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