Honeywell ST799A1003 Time Control Programmer

The ST799 is a 7 day electronic central heating time control programmer that can be use on gravity primary or fully pumped systems having separate heating and hot water temperature control.

• One or two ON/OFF periods per day.
• 12 hour time display with am/pm indication.
• Built-in battery back-up.
• Built-in start-up programme.
• Ease of operation.
• Simple change to 24 hour clock display.
• Programme indicator lights.
• Programme reset.
• Interchangeable with ST699