Operation Manual
Page 3
...thermostat Thermostat features 2 Programming at a glance 3 Quick reference to controls 4 Quick reference to display 5 Programming & Operation Set time and day 6 Select fan setting (auto/on 7 Select system setting (heat/cool 8 Using program schedules 9 Program schedule overrides 12 Auto Changeover 14 Built-in compressor protection 16 Smart Response® Technology 18 RTH6400 Programmable Thermostat... Appendices Battery installation 18 Customer assistance 19 In case of difficulty 20 Limited warranty 22 This thermostat is pre-...
...thermostat Thermostat features 2 Programming at a glance 3 Quick reference to controls 4 Quick reference to display 5 Programming & Operation Set time and day 6 Select fan setting (auto/on 7 Select system setting (heat/cool 8 Using program schedules 9 Program schedule overrides 12 Auto Changeover 14 Built-in compressor protection 16 Smart Response® Technology 18 RTH6400 Programmable Thermostat... Appendices Battery installation 18 Customer assistance 19 In case of difficulty 20 Limited warranty 22 This thermostat is pre-...
Operation Manual
Page 4
... your new Honeywell thermostat. even in the dark. • Displays both room temperature and temperature setting. • Removable battery holder for fast, easy replacement. • Built-in compressor protection. 69-2211EF-05 2 It has been designed to read - Features • Separately programmable weekday, Saturday, and Sunday schedules. • One-touch temp control overrides program...
... your new Honeywell thermostat. even in the dark. • Displays both room temperature and temperature setting. • Removable battery holder for fast, easy replacement. • Built-in compressor protection. 69-2211EF-05 2 It has been designed to read - Features • Separately programmable weekday, Saturday, and Sunday schedules. • One-touch temp control overrides program...
Operation Manual
Page 5
... To change , see pages 9-11 ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and manually adjust the temperature (see page 7 3. Set time and day (required for proper operation See page 6 2. RTH6400 Programmable Thermostat This thermostat is ready to go . Your new thermostat is set the time and day. Select fan...
... To change , see pages 9-11 ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and manually adjust the temperature (see page 7 3. Set time and day (required for proper operation See page 6 2. RTH6400 Programmable Thermostat This thermostat is ready to go . Your new thermostat is set the time and day. Select fan...
Operation Manual
Page 6
Operating Manual Quick reference to override programmed temperature control (see page 13). Hold button M28401 Press to controls Digital display (see page 5). Function buttons Press to adjust temperature settings (see page 15). Temperature buttons Press to select the function displayed just above each button. (Functions change depending on the task.) 69-2211EF-05 4 Battery holder (see pages 11-13).
Operating Manual Quick reference to override programmed temperature control (see page 13). Hold button M28401 Press to controls Digital display (see page 5). Function buttons Press to adjust temperature settings (see page 15). Temperature buttons Press to select the function displayed just above each button. (Functions change depending on the task.) 69-2211EF-05 4 Battery holder (see pages 11-13).
Operation Manual
Page 10
.... 69-2211EF-05 Press the SYSTEM button to select Heat, Cool or Off. • Heat: Thermostat controls only the heating system. • Cool: Thermostat controls only the cooling system. • Off: Heating and cooling systems are off. • Auto: Thermostat automatically selects heating or cooling depending on the indoor temperature. To prevent possible compressor damage...
.... 69-2211EF-05 Press the SYSTEM button to select Heat, Cool or Off. • Heat: Thermostat controls only the heating system. • Cool: Thermostat controls only the cooling system. • Off: Heating and cooling systems are off. • Auto: Thermostat automatically selects heating or cooling depending on the indoor temperature. To prevent possible compressor damage...
Operation Manual
Page 14
...schedule override (temporary) Press to cancel temporary setting and resume program schedule. The new temperature will be lowered when you want to control (heat or cool). For example, if you want to turn up the heat early in the morning, it will temporarily override the... be maintained only until the next programmed time period begins (see page 10). Press to temporarily adjust temperature. Note: Make sure the thermostat is set to immediately adjust the temperature. Inside 69 Temporary Heat Setting 75 6:30AM Run Schedule Fan Auto System Heat M28410 Press s or...
...schedule override (temporary) Press to cancel temporary setting and resume program schedule. The new temperature will be lowered when you want to control (heat or cool). For example, if you want to turn up the heat early in the morning, it will temporarily override the... be maintained only until the next programmed time period begins (see page 10). Press to temporarily adjust temperature. Note: Make sure the thermostat is set to immediately adjust the temperature. Inside 69 Temporary Heat Setting 75 6:30AM Run Schedule Fan Auto System Heat M28410 Press s or...
Operation Manual
Page 15
RTH6400 Programmable Thermostat Program schedule override (permanent) Press to permanently adjust temperature. 69 75 Inside Heat Hold Setting 6:30AM Run Schedule Fan Auto System Heat Press HOLD to control (heat or cool). Note: Make sure the thermostat is set will override the temperature settings for all ...program schedule. This will be maintained 24 hours a day until you want to permanently adjust the temperature. Press to adjust the thermostat manually, as needed. M28411 Whatever temperature you set to the system you manually change it, or press RUN SCHEDULE to cancel ...
RTH6400 Programmable Thermostat Program schedule override (permanent) Press to permanently adjust temperature. 69 75 Inside Heat Hold Setting 6:30AM Run Schedule Fan Auto System Heat Press HOLD to control (heat or cool). Note: Make sure the thermostat is set will override the temperature settings for all ...program schedule. This will be maintained 24 hours a day until you want to permanently adjust the temperature. Press to adjust the thermostat manually, as needed. M28411 Whatever temperature you set to the system you manually change it, or press RUN SCHEDULE to cancel ...
Operation Manual
Page 26
Registered Trademark. © 2013 Honeywell International Inc. 69-2211EF-05 M.S. 11-2013 Printed in U.S.A. Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 http://yourhome.honeywell.com Honeywell Limited 705 Montrichard Avenue Saint-Jean-sur-Richelieu, Quebec J2X 5K8 ® U.S.
Registered Trademark. © 2013 Honeywell International Inc. 69-2211EF-05 M.S. 11-2013 Printed in U.S.A. Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 http://yourhome.honeywell.com Honeywell Limited 705 Montrichard Avenue Saint-Jean-sur-Richelieu, Quebec J2X 5K8 ® U.S.