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Operating
Manual
RTH2310
Programmable Thermostat
69-2229ES-05
CAUTION: EQUIPMENT DAMAGE HAZARD
To prevent possible compressor damage, do not use Cooling mode when the outdoor temperature is below 50 °F (10 °C).
Need Help?
For assistance with this product please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.
Read and save these instructions.
®U.S. Registered Trademark. Patents pending.
©2011 Honeywell International Inc. All rights reserved.
RTH2310 Programmable Thermostat
Table of contents
About your new thermostat |
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Thermostat features ..................................... |
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Early Start..................................................... |
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Compressor protection ................................. |
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Quick reference to controls .......................... |
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Quick reference to display............................ |
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Quick start .................................................... |
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Programming & Operation |
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Set the clock................................................. |
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Select system setting (Heat/Cool) ................ |
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Select fan setting (Auto/On) ......................... |
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Using the schedule................................ |
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Temporary schedule override ..................... |
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Permanent schedule override .................... |
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Appendices |
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Filter replacement........................................ |
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Battery replacement .................................... |
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In case of difficulty....................................... |
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Customer assistance................................... |
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Limited warranty .......................................... |
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Your new thermostat is pre-programmed and ready to go!
See page 6 for quick start.
Operating Manual
About your new thermostat
Your new Honeywell thermostat has been designed to give you many years of reliable service and easy-to-use, push-button climate control.
Features
•Backlit display is easy to read
•Displays ambient (measured) temperature at all times
•One-touch access to setpoint temperature
•Energy-saving settings for maximum cost savings
•Separate programmable weekday/weekend schedules (5+2 day programming)
•Temporary and permanent override of schedule
•Early Start ensures right temperature at the right time
•Built-in compressor protection
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RTH2310 Programmable Thermostat
Early Start
Early Start allows the thermostat to “learn” how long your furnace or air conditioner takes to reach the set temperature. Simply program the desired times and desired temperatures into the schedule. The thermostat will determine when to activate heating or cooling so that the desired temperature is attained at the desired time.
Example: If you set the Wake time to 6 a.m. and the temperature to 70 °F (21 °C), the heat will come on before the set time, so the temperature is 70 °F (21 °C) by the time you wake at 6 a.m.
Built-in compressor protection
Your thermostat has a feature that helps prevent damage to the compressor of your air conditioning. Because damage can occur if the compressor is restarted too soon after shutdown, this feature forces the compressor to wait 5 minutes before restarting. During the wait time, 
flashes on the screen. When the safe wait time has elapsed, the icon stops flashing and the compressor turns on.
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Operating Manual
Quick reference to controls
Battery compartment (for 2 AA batteries)
Screen
Lit for 12 seconds when you press the backlight button or any other button.
Temperature buttons 
Backlight button
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System switch |
Fan Switch |
Programming buttons |
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(see page 8) |
(see page 9) |
(see pages 12 & 13) |
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RTH2310 Programmable Thermostat
Quick reference to display screen
Current period number
Appears when the thermostat is following the schedule (see temporary override on page 14 and permanent override on page 15)
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Setpoint indicator |
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Day |
Time |
Appears when the setpoint |
Temperature |
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temperature is displayed. |
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The ambient (measured) |
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temperature is normally |
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displayed. To view the |
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setpoint temperature, press |
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or once. The setpoint |
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temperature will appear for |
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5 seconds. |
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Heating is on |
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Cooling is on * |
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Replace batteries |
Replace filter |
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(see page 14) |
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(see page 14) |
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flashes when the compressor protection is engaged (see page 3).
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Operating Manual
This thermostat is ready to go
Simply perform the three steps below and the thermostat is in operation:
1)Set the clock (see page 7)
2)Select whether to heat or cool (see page 8)
3)Select whether to keep the fan on continuously or only when needed (see page 9)
This thermostat is pre-set with energy-saving program settings (see page 11). If you do not wish to use these settings, you can:
•Modify the schedule and temperature setpoints (see page 12)
•Temporarily override the temperature setpoint (see page 14)
•Permanently override the temperature setpoint (see page 15)
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RTH2310 Programmable Thermostat |
Set the clock |
69-2229S_A.fm |
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1) |
Press Clk. The hour will flash. |
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2) |
Press or to set the hour. |
Time and day display |
3)Press Clk. The minutes will flash.
4) Press or to set the minutes. |
Press to start time and day setting |
5)Press Clk. The day will flash.
6) |
Press or to set the day. |
Press to set the time or the day |
7) |
Press Exit. |
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Press to end time and day setting
NOTE: The time display flashes when the clock has lost its settings
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Operating Manual
Select the system setting
Use the System switch to place the system in one of the following modes:
• Heat: System is in Heating mode.
• Off: System is off.
• Cool: System is in Cooling mode.
NOTE: When you place the thermostat in Cooling mode, you might need to wait up to five minutes before cooling can start. This is a safety feature for the compressor. 
will flash on the screen until cooling starts.
CAUTION: EQUIPMENT DAMAGE HAZARD
Do not use Cooling mode when the outdoor temperature is below 50 °F (10 °C).
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RTH2310 Programmable Thermostat
Select the fan setting
Use the Fan switch to select the fan mode of operation.
Auto |
The fan runs only when heating or cooling is activated. However, if you have a gas or fuel |
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oil furnace, when heating is activated, the fan will start only when the air coming out of the |
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vents is warm enough. The fan will keep on running after heating stops until the air is no |
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longer warm enough. |
On |
The fan is always running. Use this setting for improved air circulation or for more efficient |
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air cleaning. |
NOTE: The Fan switch is not used if the fan is not connected to the thermostat.
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Operating Manual
Save money by using the schedule
The thermostat automatically adjust its temperature setpoint according to the programmed schedule. You can program up to four periods per day, with different settings for weekdays and weekends. For example, you can program all four periods for the weekdays but only two periods (Wake and Sleep) for the weekends.
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Wake |
Set the time you wake up and the temperature you want in the morning until you leave |
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(usually a comfortable level). |
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Leave |
Set the time you leave home and the temperature you want while you are away (usually an |
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economical level). |
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Return |
Set the time you return home and the temperature you want during the evening until bedtime |
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(usually a comfortable level). |
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Sleep |
Set the time you go to bed and the temperature you want overnight (usually an economical |
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level). |
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To program a period, you need to set its start time and its two temperature settings (one when the thermostat is in cooling mode and another one when it is in heating mode).
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RTH2310 Programmable Thermostat
Energy saving default schedule
This thermostat is pre-set with energy-saving program settings. These settings can reduce your energy bills by 33%. See the next page if you wish to modify the settings.
Period |
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Weekdays |
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Weekends |
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Start time |
Heat |
Cool |
Start time |
Heat |
Cool |
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Wake |
6:00 am |
70 °F (21 °C) |
78 °F (25.5 °C) |
6:00 am |
70 °F (21 °C) |
78 °F (25.5 °C) |
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Leave |
8:00 am |
62 °F (16.5 °C) |
85 °F (29.5 °C) |
- - |
- - |
- - |
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Return |
6:00 pm |
70 °F (21 °C) |
78 °F (25.5 °C) |
- - |
- - |
- - |
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Sleep |
10:00 pm |
62 °F (16.5 °C) |
82 °F (28 °C) |
10:00 pm |
62 °F (16.5 °C) |
82 °F (28 °C) |
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Operating Manual
To modify the schedule
1)Press Pgm. The settings for period 1 for Monday through Friday are displayed.
2)Press Day to switch between MO TU WE TH FR (Monday through Friday) and SA SU (Saturday and Sunday).
NOTE: Press Day for 3 seconds to select all 7 days.
3)To select another period, press P# until the desired period number is displayed.
NOTE: To skip the displayed period, press Clr. For example, periods 2 and 3 have been skipped for Saturday and Sunday in the default schedule.
Period |
Temperature |
start time |
setpoint |
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Period |
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Appears when |
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number |
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the heat setpoint |
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is displayed |
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Program |
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days |
Appears when |
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the cool setpoint |
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is displayed |
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