Honeywell Home RTH2410B1019/E1 User manual

RTH2510/RTH2410
Programmable Thermostat
Operating
Manual
69-2420ES-03
M38852
Heat Off Cool Auto On
Fan
Set
Hold
Run
Fr
Return
pm
Cool
72
On
6:30

This manual covers the RTH2510 and RTH2410 models.
Read and save these instructions.
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 www.resideo.com
or call Resideo Customer Care toll-free at 1-800-468-1502.

Programmable Thermostat RTH2510/RTH2410
Overview
Thermostat features ...............................................2
Quick start..................................................................3
Quick reference to controls ..................................4
Quick reference to display....................................5
Programming & Operation
Setting the clock ......................................................6
System switch (Heat/Cool)...................................7
Fan switch (Auto/On).............................................8
Using the schedule..................................................9-12
Temporary schedule override ..............................13
Permanent schedule override .............................14
Early start ...................................................................15
Compressor protection ..........................................15
Appendices
Battery replacement .............................................. 16
In case of difficulty ................................................. 17
Customer assistance.............................................. 18
One-year limited warranty ...................................19
Table of contents
Your new thermostat is pre-
programmed and ready to go!
See page 3 for quick start.

Operating Manual
69-2420ES—03 2
Your new 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
• Separate programmable daily schedules (7-day programming)
• Temporary and permanent override of schedule
• Early start ensures the right temperature at the right time
• Built-in compressor protection
About your new thermostat

RTH2510/RTH2410 Programmable Thermostat
3 69-2420ES—03
Simply perform the three steps below and the thermostat is in operation:
Set the clock....................................................................................................................See page 6
Select whether to heat or cool..................................................................................See page 7
Select whether to run the fan continuously or only when needed ............See page 8
Your thermostat is pre-programmed with energy saving settings. If you do not wish to
use these settings, you can:
Modify the schedule (RTH2510).......................................................................... See page 11
Modify the schedule (RTH2410).......................................................................... See page 12
Temporarily override the schedule...................................................................... See page 13
Permanently override the schedule.................................................................... See page 14
This thermostat is ready to go

Operating Manual
69-2420ES—03 4
Quick reference to controls
M38893
Heat Off Cool
Auto On
Fan
Set
Hold
Run
System switch (see page 7)
•Cool: System is in Cooling
mode.
•Off: System is off.
• Heat: System is in Heating
mode.
Fan switch (see page 8)
•On: Fan runs continuously.
•Auto: Fan runs only when
heating or cooling is activated.
Up/Down buttons
Press to adjust temperature.
Screen
Lit for 12 seconds when you
press any button.
Press to set clock, day or
schedule (see pages 6 &
11/12).
Press to override schedule and
hold temperature (see page
14).
Press to run (follow) schedule
(see page 9).

RTH2510/RTH2410 Programmable Thermostat
5 69-2420ES—03
Quick reference to display
M38896
* When Heat On or Cool On is flashing, compressor protection is engaged (see page 15).
Temperature
The ambient (measured) temperature
is normally displayed. To view the
setpoint temperature, press the Up or
Down button once. The setpoint
temperature will appear for five
seconds.
System status
• Cool On: Cooling is activated. *
• Heat On: Heating is activated. *
• Aux On: Auxiliary heat is activated.
Low-battery warning
(see page 16)
Setpoint indicator
Appears when the setpoint
temperature is displayed.
Clock
Schedule period
Permanent schedule override
(see page 14)
Temporary schedule override
(see page 13)

Operating Manual
69-2420ES—03 6
Press the Set button. Set Time will appear on the screen and
the time display will flash.
Press the Up or Down button to set the time.
Press the Set button again. Set Day will flash on the screen.
Press the Up or Down button to select the day of the week.
Press the Run button to save the changes & exit. (The
changes are also saved if you do not press any button for 60
seconds.)
NOTE: The clock has lost its settings when the time display flashes. If the thermostat is
following the schedule, it will use the temperature settings programmed for the Wake
period for Monday until you readjust the clock.
Set the clock
M38897

RTH2510/RTH2410 Programmable Thermostat
7 69-2420ES—03
System switch (Heat/Cool)
Use the System switch to place the system in
one of the following modes:
•Cool: System is in Cooling mode.
•Off: System is off.
•Heat: System is in Heating mode.
CAUTION: EQUIPMENT DAMAGE HAZARD.
Do not use Cooling mode when the outdoor temperature is below 50°F
(10°C).
M38894
Heat Off Cool
Auto On
Fan
Set
Hold
Run

Operating Manual
69-2420ES—03 8
Fan switch (Auto/On)
Use the Fan switch to select the fan
operation.
•Auto: The fan runs only when heating or
cooling is activated (commonly used
setting).
•On: The fan runs continuously.
M38895
Heat Off Cool
Auto On
Fan
Set
Hold
Run

RTH2510/RTH2410 Programmable Thermostat
9 69-2420ES—03
It’s easy to program your system for maximum energy savings. You can program four
time periods each day, with different settings for weekdays and weekends.
Save money by setting program schedules
WAKE
6:00 am
70 º
Set to the time you awaken and the temperature you want
during the morning, until you leave for the day.
LEAVE
8:00 am
62 º
Set to the time you leave home and the temperature you want
while you are away (usually an energy-saving level).
RETURN
6:00 pm
70 º
Set to the time you return home and the temperature you want
during the evening, until bedtime.
SLEEP
10:00
pm
62 º
Set to the time you go to bed and the temperature you want
overnight (usually an energy-saving level).

Operating Manual
69-2420ES—03 10
The thermostat is preset with energy saving program settings. See the next two pages
if you wish to modify the settings.
Energy saving settings
Period Start time Heat Cool
Wake 6:00 AM 70°F (21°C) 78°F (25.5°C)
Leave 8:00 AM 62°F (16.5°C) 85°F (29.5°C)
Return 6:00 PM 70°F (21°C) 78°F (25.5°C)
Sleep 10:00 PM 62°F (16.5°C) 82°F (27.5°C)

RTH2510/RTH2410 Programmable Thermostat
11 69-2420ES—03
Press the Set button 3 times until Set Schedule appears. The Wake period is
displayed.
NOTE: To set another period, press the Set button as many times as needed until the
desired period and the desired day are displayed and its time or temperature is
flashing.
When the time flashes, press the Up or Down button to set the time.
Press the Set button.
To set the temperature for cooling mode, first place the System switch in Cool.
To set the temperature for heating mode, first place the System switch in Heat.
When the temperature flashes, press the Up or Down button to set the
temperature.
Press the Set button.
Repeat steps 2 through 6 to set each of the remaining periods.
Once all changes are made, press the Run button to save them and return to
normal display. (The changes will automatically be saved if you do not press
any button for 60 seconds.)
Modifying the schedule (RTH2510)
To skip a period
(except Wake),
press the Hold
button for 4
seconds while that
period is displayed.
Wake period for
Monday is set to 6
a.m. and 70°F
M38898
M38899

Operating Manual
69-2420ES—03 12
Press the Set button 3 times until Set Schedule appears. The Wake period is
displayed.
NOTE: To set another period, press the Set button as many times as needed until the
desired period and the desired day are displayed and its time or temperature is
flashing.
When the time flashes, press the Up or Down button to set the time.
Press the Set button.
To set the temperature for cooling mode, first place the System switch in Cool.
To set the temperature for heating mode, first place the System switch in Heat.
When the temperature flashes, press the Up or Down button to set the
temperature.
Press the Set button.
Repeat steps 2 through 6 to set each of the remaining periods.
Once all changes are made, press the Run button to save them and return to
normal display. (The changes will automatically be saved if you do not press
any button for 60 seconds.)
Modifying the schedule (RTH2410)
To skip a period
(except Wake),
press the Hold
button for 4
seconds while that
period is displayed.
Wake period for the
weekdays is set to
6 a.m. and 70°F
M38900
M38901

RTH2510/RTH2410 Programmable Thermostat
13 69-2420ES—03
To temporarily ignore the schedule, press the Up or
Down button until the desired temperature is
displayed. The word Temporary will appear on the
screen and the period display will flash to indicate
that the current period has been overridden. The new
temperature will be used until the next period begins.
NOTE: Pressing the Up or Down button once will display the setpoint temperature. To
change the setpoint temperature, press either button more than once.
Press the Run button if you wish to cancel the temporary setting before the beginning
of the next period.
Temporary override of schedule
M38902

Operating Manual
69-2420ES—03 14
To permanently ignore the schedule, press the Up or
Down button until the desired temperature is
displayed. Then, press the Hold button to maintain
the new temperature indefinitely. The word Hold will
appear on the screen.
Press the Run button if you wish to cancel the
override and resume the schedule. The word Hold will
disappear and the thermostat will be set to the
temperature programmed for the current period.
Permanent override of schedule
M38903

RTH2510/RTH2410 Programmable Thermostat
15 69-2420ES—03
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 or heat pump system. 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, the message Cool On or Heat On
flashes on the screen. When the safe wait time has elapsed, the message stops
flashing and the compressor turns on.
Early start
Built-in compressor protection

Operating Manual
69-2420ES—03 16
Install two fresh AAA batteries when Lo Batt flashes
on the screen. Lo Batt appears for 60 days before the
batteries are depleted.
Replace batteries once a year, or when you will be
away for more than a month.
Most settings are stored in non-volatile (permanent)
memory. Only the clock and the day must be set after
you replace the batteries.
Battery replacement
Set the System switch to Off before removing the batteries. Otherwise, the
heating/cooling system could remain activated even when batteries are
removed.
M38855

RTH2510/RTH2410 Programmable Thermostat
17 69-2420ES—03
In case of difficulty
Screen is blank. • Ensure two fresh AAA alkaline batteries are correctly installed.
Temperature settings cannot be changed. • The System switch is off.
• You are setting the temperature outside its allowable range:
• Heat: 40°F to 90°F (4.5°C to 32°C)
• Cool: 50°F to 99°F (10°C to 37°C)
Cool On or Heat On
is flashing.
• The compressor protection delay is underway. Wait for the delay to end (maximum of 5
minutes).
HI appears on the screen. • The ambient (measured) temperature is above 122°F (50°C).
LO appears on the screen. • The ambient (measured) temperature is below 32°F (0°C).
E1 appears on the screen. • The temperature sensor circuit is opened. Replace the thermostat.
E2 appears on the screen. • The temperature sensor circuit is shorted. Replace the thermostat.

Operating Manual
69-2420ES—03 18
For assistance with this product, please visit www.resideo.com.
Or call Resideo Customer Care toll-free at 1-800-468-1502.
To save time, before calling, proceed as follows:
Loosen the locking screw at the bottom of the thermostat. Note
that the screw is captive and cannot be removed from the
wallplate.
Separate the thermostat from the wallplate as per figure on the
right.
Note your model number and date code on the thermostat’s
wallplate.
Customer assistance
M38892