Applies To

Intermatic EI-501 Series 7-Day Programmable Timers

Question / Problem

How do I adjust the calculated dawn and dusk times on an EI-501 Series timer?

Common Application / Operating Conditions

• The initial date and Astronomic Zone setup is complete.
• The timer calculates dawn and dusk from the current date and selected Astronomic Zone.
• The timer is displaying the Home screen.

Step-by-Step Resolution

1. Display the Calculated Astronomic ON/OFF Times

   Press Sun/Moon to toggle between the current dawn and dusk times.

2. Select the Dawn Setting

   Press Sun/Moon until the sun symbol appears.

3. Adjust the Dawn Offset

   Press + or - to move the calculated dawn time earlier or later. The adjustment is entered as an offset in minutes.

4. Select the Dusk Setting

   Press Sun/Moon again until the moon symbol appears.

5. Adjust the Dusk Offset

   Press + or - to move the calculated dusk time earlier or later. Press Home when the adjustment is complete.

Tips / Additional Notes

• Confirm the current date and Astronomic Zone before applying an offset.
• Dawn and dusk have separate offsets, so review and adjust each setting individually.
• The timer continues to calculate seasonal changes after an offset is applied.