Hayward SUMHEAT HP5171DT3 Installation Instructions Manual page 72

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