Just bought a property with this programmer installed but setting instructions unclear. How do I operate it?

Sangamo Choice PR2N 2 Channel Programmer
In Stock
Part No.: SANCHOICEPR2N
- 24 hour, 5/2 day and 7 day selectable
- 2 or 3 ON/OFF periods selectable
- 1, 2 or 3 hour boost
- Advance to next programmed event
- Automatic Summer/Winter time change
- Standard wall plate - simple plug in and replace
- Pumped or gravity system selectable
How do I turn the heating off in the summer.
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