Owner's Manual
Page 3
... do not operate cooling system when outdoor temperature is preprogrammed and ready to go ! Your new thermostat is below 50˚F (10˚C). See page 3 to check settings. Table of contents RTH8500 About your new thermostat Thermostat features 2 Programming at a glance 3 Quick reference to controls 4 Quick reference to status display......... 5 Programming & Operation Clock setting 6 Fan setting 7 System setting 8 Using program schedules 9 Program schedule overrides 12 Vacation hold 14 Special features 15 Screen cleaning 16 Furnace filter reminder 17 Appendices Battery...
... do not operate cooling system when outdoor temperature is preprogrammed and ready to go ! Your new thermostat is below 50˚F (10˚C). See page 3 to check settings. Table of contents RTH8500 About your new thermostat Thermostat features 2 Programming at a glance 3 Quick reference to controls 4 Quick reference to status display......... 5 Programming & Operation Clock setting 6 Fan setting 7 System setting 8 Using program schedules 9 Program schedule overrides 12 Vacation hold 14 Special features 15 Screen cleaning 16 Furnace filter reminder 17 Appendices Battery...
Owner's Manual
Page 4
Operating Manual About your heating/cooling expenses. • One-touch temp control overrides program schedule at any time. • Precise comfort control keeps temperature within 1°F of the level you set. • Change/check reminders let you know when to replace filters and batteries. • Large touchscreen display with backlight is easy to give you many years of reliable service and touchscreen climate control. It has been designed to read-even in the...
Operating Manual About your heating/cooling expenses. • One-touch temp control overrides program schedule at any time. • Precise comfort control keeps temperature within 1°F of the level you set. • Change/check reminders let you know when to replace filters and batteries. • Large touchscreen display with backlight is easy to give you many years of reliable service and touchscreen climate control. It has been designed to read-even in the...
Owner's Manual
Page 5
Select fan setting: Preset to Auto To change , see pages 10-13 ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and manually adjust the temperature (see pages 12-14). RTH8500 Your new thermostat is set the time and day. Select system setting: Preset to do is pre-programmed and ready to bed at 6 pm and go to go ! Program schedules: Preset to energy-saving levels while you're at work or...
Select fan setting: Preset to Auto To change , see pages 10-13 ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and manually adjust the temperature (see pages 12-14). RTH8500 Your new thermostat is set the time and day. Select system setting: Preset to do is pre-programmed and ready to bed at 6 pm and go to go ! Program schedules: Preset to energy-saving levels while you're at work or...
Owner's Manual
Page 6
... select fan operation (see page 7) Press to select system type (see page 8) Press to set program schedule (see page 11) MON TUE WED THU FRI SAT SUN OK TO PICK MULTIPLE DAYS 70 FAN Inside AUTO 70 Set To SYSTEM HEAT 6:01 AM Following Schedule SCHED HOLD CLOCK SCREEN MORE Press to adjust temperature settings (see pages 11-14) Press for more options (select models only) Press to override program schedule (see...
... select fan operation (see page 7) Press to select system type (see page 8) Press to set program schedule (see page 11) MON TUE WED THU FRI SAT SUN OK TO PICK MULTIPLE DAYS 70 FAN Inside AUTO 70 Set To SYSTEM HEAT 6:01 AM Following Schedule SCHED HOLD CLOCK SCREEN MORE Press to adjust temperature settings (see pages 11-14) Press for more options (select models only) Press to override program schedule (see...
Owner's Manual
Page 7
Quick reference to status display Current inside temperature Current day of week RTH8500 Temperature setting Fan setting System setting Current time WED 70 FAN Inside AUTO SYSTEM HEAT 6:01 AM 70 Set To Following Schedule Recovery Program schedule on (does not display when off) SCHED HOLD CLOCK SCREEN MORE Smart Response® Technology in effect (see page 15) Other display messages: • Cool On: Cooling system is activated • Heat On: Heating system is activated • Aux Heat On: Auxiliary heating system is activated (heat pump systems only)
Quick reference to status display Current inside temperature Current day of week RTH8500 Temperature setting Fan setting System setting Current time WED 70 FAN Inside AUTO SYSTEM HEAT 6:01 AM 70 Set To Following Schedule Recovery Program schedule on (does not display when off) SCHED HOLD CLOCK SCREEN MORE Smart Response® Technology in effect (see page 15) Other display messages: • Cool On: Cooling system is activated • Heat On: Heating system is activated • Aux Heat On: Auxiliary heating system is activated (heat pump systems only)
Owner's Manual
Page 8
... CLOCK SCREEN MORE 70 70 FAN Inside Set To AUTO Adjust time, then press DONE 6:02 AM DONE CANCEL To set the current time display, press CLOCK, then press s or t to exit without changing the time). Press DONE to save & exit (or press CANCEL to adjust the time. Note: The real-time clock should never require adjustment since it automatically updates for daylight savings time, and stores all date/time information. Press and hold s or t to advance...
... CLOCK SCREEN MORE 70 70 FAN Inside Set To AUTO Adjust time, then press DONE 6:02 AM DONE CANCEL To set the current time display, press CLOCK, then press s or t to exit without changing the time). Press DONE to save & exit (or press CANCEL to adjust the time. Note: The real-time clock should never require adjustment since it automatically updates for daylight savings time, and stores all date/time information. Press and hold s or t to advance...
Owner's Manual
Page 9
Fan setting WED 70 FAN Inside AUTO SYSTEM HEAT 6:01 AM 70 Set To Following Schedule SCHED HOLD CLOCK SCREEN MORE Press FAN RTH8500 Press FAN to select fan operation, then press DONE. • On: Fan is always on. • Auto: Fan runs only when the heating or cooling system is on.
Fan setting WED 70 FAN Inside AUTO SYSTEM HEAT 6:01 AM 70 Set To Following Schedule SCHED HOLD CLOCK SCREEN MORE Press FAN RTH8500 Press FAN to select fan operation, then press DONE. • On: Fan is always on. • Auto: Fan runs only when the heating or cooling system is on.
Owner's Manual
Page 10
...; Heat: Thermostat controls only the heating system. • Cool: Thermostat controls only the cooling system. • Auto: Thermostat automatically selects heating or cooling depending on how your thermostat was installed. Operating Manual System setting WED 70 FAN Inside AUTO SYSTEM HEAT 6:01 AM 70 Set To Following Schedule SCHED HOLD CLOCK SCREEN MORE Note: The Auto and Em Heat system settings may not appear, depending on the indoor temperature. • Off: Heating and cooling systems are off. • Em Heat (only for heat pumps with auxiliary heat): Thermostat controls Emergency...
...; Heat: Thermostat controls only the heating system. • Cool: Thermostat controls only the cooling system. • Auto: Thermostat automatically selects heating or cooling depending on how your thermostat was installed. Operating Manual System setting WED 70 FAN Inside AUTO SYSTEM HEAT 6:01 AM 70 Set To Following Schedule SCHED HOLD CLOCK SCREEN MORE Note: The Auto and Em Heat system settings may not appear, depending on the indoor temperature. • Off: Heating and cooling systems are off. • Em Heat (only for heat pumps with auxiliary heat): Thermostat controls Emergency...
Owner's Manual
Page 11
... by setting program schedules RTH8500 It's easy to the time you return home and the temperature you leave for the day. Set to the time you awaken and the temperature you want during the morning, until bedtime. You can program four time periods each day, with different settings for maximum energy savings. WAKE 6:00 am 70 ° LEAVE 8:00 am 62 ° RETURN 6:00 pm 70 ° SLEEP 10...
... by setting program schedules RTH8500 It's easy to the time you return home and the temperature you leave for the day. Set to the time you awaken and the temperature you want during the morning, until bedtime. You can program four time periods each day, with different settings for maximum energy savings. WAKE 6:00 am 70 ° LEAVE 8:00 am 62 ° RETURN 6:00 pm 70 ° SLEEP 10...
Owner's Manual
Page 12
We recommend these settings, since they can reduce your heating/cooling expenses by as much as 33%. (See next page to use EnergyStar® program settings. Operating Manual EnergyStar® settings for maximum cost savings This thermostat is pre-set to adjust times and temperatures of each time period.) Wake (6:00 am) Leave (8:00 am) Return (6:00 pm) Sleep (10:00 pm) Heat (Mon-Fri) 70 ° 62 °...
We recommend these settings, since they can reduce your heating/cooling expenses by as much as 33%. (See next page to use EnergyStar® program settings. Operating Manual EnergyStar® settings for maximum cost savings This thermostat is pre-set to adjust times and temperatures of each time period.) Wake (6:00 am) Leave (8:00 am) Return (6:00 pm) Sleep (10:00 pm) Heat (Mon-Fri) 70 ° 62 °...
Owner's Manual
Page 13
... FAN Inside AUTO 70 Set To To adjuWsEDt program Following Schedule schedules RTH8500 67:000 FAN Inside AM PrAeUTsOs SCHED 70 Set To SCHED HOLD CLOCK SCREFESNoclhloewdMuiOnleRgE 6:00 Press EDIT AM DONE EDIT WAKE LEAVE RETURN SLEEP CANCEL Select day(s) Set heat/cool levels MON TUE WED THU FRI SAT SUN OK TO PICK MULTIPLE DAYS FAN AUTO 70 HEAT 1. Press SCHED, then EDIT. 2. Press s or t to set time and temperatures for each. 6. CANCEL PERIOD 6:00 AM 78 COOL...
... FAN Inside AUTO 70 Set To To adjuWsEDt program Following Schedule schedules RTH8500 67:000 FAN Inside AM PrAeUTsOs SCHED 70 Set To SCHED HOLD CLOCK SCREFESNoclhloewdMuiOnleRgE 6:00 Press EDIT AM DONE EDIT WAKE LEAVE RETURN SLEEP CANCEL Select day(s) Set heat/cool levels MON TUE WED THU FRI SAT SUN OK TO PICK MULTIPLE DAYS FAN AUTO 70 HEAT 1. Press SCHED, then EDIT. 2. Press s or t to set time and temperatures for each. 6. CANCEL PERIOD 6:00 AM 78 COOL...
Owner's Manual
Page 14
... set timer Press s or t to resume program schedule 12 When the timer expires, the program schedule will be maintained only until the time you 've programmed for the current time period. To cancel the temporary setting at any time, press CANCEL (or SCHED). This will resume. Operating Manual Program schedule override (temporary) Adjust temperature WED 70 FAN Inside AUTO SYSTEM HEAT Hold Temperature Until 8:00 AM 73 Set To Heat On SCHED HOLD CLOCK SCREEN MORE CANCEL Press to set . The program schedule will temporarily override the temperature setting...
... set timer Press s or t to resume program schedule 12 When the timer expires, the program schedule will be maintained only until the time you 've programmed for the current time period. To cancel the temporary setting at any time, press CANCEL (or SCHED). This will resume. Operating Manual Program schedule override (temporary) Adjust temperature WED 70 FAN Inside AUTO SYSTEM HEAT Hold Temperature Until 8:00 AM 73 Set To Heat On SCHED HOLD CLOCK SCREEN MORE CANCEL Press to set . The program schedule will temporarily override the temperature setting...
Owner's Manual
Page 15
This will be maintained 24 hours a day until you set will turn off the program schedule. Whatever temperature you manually change it or press CANCEL (or SCHED) to cancel "Hold" and resume the program schedule. Press CANCEL (or SCHED) to permanently adjust the temperature. Program schedule override (permanent) RTH8500 Press HOLD Adjust temperature WED 70 FAN Inside AUTO SYSTEM 73 Set To Heat On HEAT 8:00 AM Permanent Hold SCHED HOLD CLOCK SCREEN MORE CANCEL Press HOLD to resume program schedule 13
This will be maintained 24 hours a day until you set will turn off the program schedule. Whatever temperature you manually change it or press CANCEL (or SCHED) to cancel "Hold" and resume the program schedule. Press CANCEL (or SCHED) to permanently adjust the temperature. Program schedule override (permanent) RTH8500 Press HOLD Adjust temperature WED 70 FAN Inside AUTO SYSTEM 73 Set To Heat On HEAT 8:00 AM Permanent Hold SCHED HOLD CLOCK SCREEN MORE CANCEL Press HOLD to resume program schedule 13
Owner's Manual
Page 16
Operating Manual Vacation hold 1. Press to select number of days This feature can suspend the program schedule for extended periods of days you set time for the number of time. If you return earlier than expected, press CANCEL (or SCHED) to set will resume at the time you select. Whatever temperature you want the schedule to set . WSEDet temperature 70 FAN Inside AUTO 55 Set To SYSTEM HEAT Hold Temperature Until 6:00PM SCHED HOLD CLOCK SCREEN MORE CANCEL WED 2. Press s or t to...
Operating Manual Vacation hold 1. Press to select number of days This feature can suspend the program schedule for extended periods of days you set time for the number of time. If you return earlier than expected, press CANCEL (or SCHED) to set will resume at the time you select. Whatever temperature you want the schedule to set . WSEDet temperature 70 FAN Inside AUTO 55 Set To SYSTEM HEAT Hold Temperature Until 6:00PM SCHED HOLD CLOCK SCREEN MORE CANCEL WED 2. Press s or t to...
Owner's Manual
Page 17
... the wait time, the message "Wait" is displayed on the same day. For example: Set the Wake time to 6 am , so the temperature is 70° by the time you set. The thermostat will come on the indoor temperature. Auto Changeover: This feature is used in climates where both air conditioning and heating are used on screen. Heat and cool settings must be at 6. CAUTION: To avoid possible compressor damage, do not use Auto Changeover if...
... the wait time, the message "Wait" is displayed on the same day. For example: Set the Wake time to 6 am , so the temperature is 70° by the time you set. The thermostat will come on the indoor temperature. Auto Changeover: This feature is used in climates where both air conditioning and heating are used on screen. Heat and cool settings must be at 6. CAUTION: To avoid possible compressor damage, do not use Auto Changeover if...
Owner's Manual
Page 18
... time for cleaning. After 30 seconds, press DONE to lock the screen for cleaning. 30 OK TO CLEAN SCREEN Note: Do not spray any settings. Operating Manual WED 70 70 ASFAcbN roIenusideetnyoculeranneSieSntCwTRoEgENtLOhCKEeD rmostat AUTO Press SCREEN 6:00PM Following Schedule SCHED HOLD CLOCK SCREEN MORE Screen lock timer (30 seconds) Press SCREEN to resume normal operation, or press SCREEN again if you can clean the screen without changing any liquid directly on the thermostat...
... time for cleaning. After 30 seconds, press DONE to lock the screen for cleaning. 30 OK TO CLEAN SCREEN Note: Do not spray any settings. Operating Manual WED 70 70 ASFAcbN roIenusideetnyoculeranneSieSntCwTRoEgENtLOhCKEeD rmostat AUTO Press SCREEN 6:00PM Following Schedule SCHED HOLD CLOCK SCREEN MORE Screen lock timer (30 seconds) Press SCREEN to resume normal operation, or press SCREEN again if you can clean the screen without changing any liquid directly on the thermostat...
Owner's Manual
Page 19
... timer. Press RESET. 4. Press RESET after changing the filter, to save and exit. FAN AUTO CHANGE FILTER 70 Inside 55 Set To SYSTEM RESET HEAT 6:00 PM SCHED HOLD CLOCK SCREEN MORE Press MORE to select the desired interval, then press DONE. 3. DONE 17 Press s or t to change the reminder interval: 1. Filter 60 Days RTH8500 If activated during installation, the furnace filter reminder alerts you when it is time to replace your filter. Furnace filter reminder Press RESET afWteEDr changing filter...
... timer. Press RESET. 4. Press RESET after changing the filter, to save and exit. FAN AUTO CHANGE FILTER 70 Inside 55 Set To SYSTEM RESET HEAT 6:00 PM SCHED HOLD CLOCK SCREEN MORE Press MORE to select the desired interval, then press DONE. 3. DONE 17 Press s or t to change the reminder interval: 1. Filter 60 Days RTH8500 If activated during installation, the furnace filter reminder alerts you when it is time to replace your filter. Furnace filter reminder Press RESET afWteEDr changing filter...
Owner's Manual
Page 20
The warning flashes about 30 days before leaving home for more than a month. Even if the warning does not appear, you should replace batteries once a year, or before batteries are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. Operating Manual ABbatotuetryyoruerplnaecwemtheenrtmostat Grasp thermostat and pull to remove fom wallplate Batteries are depleted. Install fresh batteries immediately when the LO BATT warning begins flashing. Insert 3 fresh AAA alkaline batteries 18
The warning flashes about 30 days before leaving home for more than a month. Even if the warning does not appear, you should replace batteries once a year, or before batteries are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. Operating Manual ABbatotuetryyoruerplnaecwemtheenrtmostat Grasp thermostat and pull to remove fom wallplate Batteries are depleted. Install fresh batteries immediately when the LO BATT warning begins flashing. Insert 3 fresh AAA alkaline batteries 18
Owner's Manual
Page 21
... suggestions. Button on . • Make sure furnace door is closed securely. • If thermostat is activated (see page 18). blank 19 Display is blank • Check circuit breaker and reset if necessary. • Make sure power switch at heating & cooling system is on lower • This button will remain blank unless the furnace filter change right of difficulty RTH8500 If you have difficulty with your Installation Guide). Most problems can...
... suggestions. Button on . • Make sure furnace door is closed securely. • If thermostat is activated (see page 18). blank 19 Display is blank • Check circuit breaker and reset if necessary. • Make sure power switch at heating & cooling system is on lower • This button will remain blank unless the furnace filter change right of difficulty RTH8500 If you have difficulty with your Installation Guide). Most problems can...
Owner's Manual
Page 22
... to set lower than the Inside temperature. Operating Manual In case of difficulty Heating or • Press SYSTEM to set cooling system higher than the Inside temperature. • Check circuit breaker and reset if necessary. • Make sure power switch at heating & cooling system is on. • Make sure furnace door is closed securely. • If "Wait" is displayed, the compressor protection timer is set system to Heat. Make sure the temperature is...
... to set lower than the Inside temperature. Operating Manual In case of difficulty Heating or • Press SYSTEM to set cooling system higher than the Inside temperature. • Check circuit breaker and reset if necessary. • Make sure power switch at heating & cooling system is on. • Make sure furnace door is closed securely. • If "Wait" is displayed, the compressor protection timer is set system to Heat. Make sure the temperature is...
