Honeywell RTH2310 User manual

RTH2310
Programmable Thermostat
Operating
Manual
69-2229ES-05

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® U.S. Registered Trademark. Patents pending.
© 2011 Honeywell International Inc. All rights reserved.
CAUTION: EQUIPMENT DAMAGE HAZARD
To prevent possible compressor damage, do not use Cooling mode when the outdoor
temperature is below 50 °F (10 °C).

RTH2310 Programmable Thermostat
About your new thermostat
Thermostat features ..................................... 2
Early Start..................................................... 3
Compressor protection ................................. 3
Quick reference to controls .......................... 4
Quick reference to display............................ 5
Quick start .................................................... 6
Programming & Operation
Set the clock................................................. 7
Select system setting (Heat/Cool) ................ 8
Select fan setting (Auto/On) ......................... 9
Using the schedule................................ 10-13
Temporary schedule override ..................... 14
Permanent schedule override .................... 15
Appendices
Filter replacement........................................16
Battery replacement ....................................17
In case of difficulty.......................................18
Customer assistance...................................19
Limited warranty ..........................................20
Table of contents
Your new thermostat is pre-programmed
and ready to go!
See page 6 for quick start.

Operating Manual
2
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
About your new thermostat

RTH2310 Programmable Thermostat
3
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.
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.
Early Start
Built-in compressor protection

Operating Manual
4
Quick reference to controls
System switch
(see page 8)
Fan Switch
(see page 9)
Screen
Lit for 12 seconds when
you press the backlight
button or any other button.
Programming buttons
(see pages 12 & 13)
Temperature buttons
Battery compartment (for 2 AA batteries)
Backlight button

RTH2310 Programmable Thermostat
5
Quick reference to display screen
* flashes when the compressor protection is engaged (see page 3).
Temperature
The ambient (measured)
temperature is normally
displayed. To view the
setpoint temperature, press
or once. The setpoint
temperature will appear for
5 seconds.
Replace batteries
(see page 14)
Setpoint indicator
Appears when the setpoint
temperature is displayed.
Time
Current period number
Appears when the thermostat
is following the schedule (see
temporary override on page
14 and permanent override on
page 15)
Day
Heating is on
Cooling is on *
Replace filter
(see page 14)

Operating Manual
6
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)
This thermostat is ready to go

RTH2310 Programmable Thermostat
7
1) Press Clk. The hour will flash.
2) Press or to set the hour.
3) Press Clk. The minutes will flash.
4) Press or to set the minutes.
5) Press Clk. The day will flash.
6) Press or to set the day.
7) Press Exit.
NOTE: The time display flashes when the clock has lost its settings
Set the clock
Press to start time and day setting
Press to set the time or the day
Time and day display
Press to end time and day setting
69-2229S_A.fm

Operating Manual
8
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.
CAUTION: EQUIPMENT DAMAGE HAZARD
Do not use Cooling mode when the outdoor temperature is below 50 °F (10 °C).
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.