Hayward SumHeat HP5171DT3 Manuel D'instructions Et D'installation page 76

4. USER INTERFACE (continued)
Setting the Timer (continued)
1) Start time, input and confirmation.
2) End time, input and confirmation.
3) Confirm.
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4) Activation.
5) Deactivation.
6) Back to the main screen.
The setting step is "hour to hour".
Once the Timer is activated, it is active 7 days a week.
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Confirm