Honeywell TB7220U - Time Format and Periods

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Step 8. User Setup Number 0540: Number of Programmable Periods per Day.
To change the current setting, use the Up and Down buttons.
Options:
2 — 2 periods per day.
4 — 4 periods per day.
Step 9. User Setup Number 0640: Time Format.
To change the current setting, use the Up and Down buttons. Options:
12 — 12 hour clock.
24 — 24 hour clock.
Step 10. Exit User Setup
Press DONE to exit Advanced Settings and return to the main screen.