Honeywell RTHL2510 series User manual

Operating
Manual
RTHL2510/RTHL2410 Series
Programmable Thermostat
69-2579EF-03

Read and save these instructions.
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
® U.S. Registered Trademark. Patents pending.
Copyright © 2013 Honeywell International Inc. All rights reserved.
This manual covers the following models:
RTHL2510
RTHL2410
CAUTION: EQUIPMENT DAMAGE HAZARD.
To prevent possible compressor damage, do not operate cooling system when outdoor
temperature is below 50°F (10°C).

RTHL2510/RTHL2410
1 69-2579EF—03
About your new thermostat
Thermostat features.................................... 2
Thermostat is preset, ready to go............... 3
Quick reference to controls ......................... 4
Quick reference to display........................... 5
Programming & Operation
Set time and day......................................... 6
Select system setting.................................. 7
Select fan setting ........................................ 8
Using program schedules ..................... 9–10
Adjust program schedule (RTHL2510) ..... 11
Adjust program schedule (RTHL2410) ..... 12
Program schedule overrides ............... 13–14
Compressor protection.............................. 15
Early Start ................................................. 16
Appendices
Battery replacement.................................. 17
Customer assistance ................................ 18
In case of difficulty .............................. 19–20
Limited warranty........................................ 21
This thermostat is ready to go!
Your new thermostat is pre-programmed
and ready to go.
See page 10 to check settings.
Table of contents

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
• Presetprogramsettings
• Temporaryandpermanentoverrideofschedule
• Earlystartensurestherighttemperatureattherighttime
• Built-incompressorprotection
Operating Manual
2

RTHL2510/RTHL2410
3 69-2579EF—03
This thermostat is ready to go!
Your new thermostat is pre-programmed and ready to go. All you have to do is set the
time and day. Then check the settings below and change if needed:
1. Set time and day (required for proper operation)..............................See page 6
2. Select system setting: Preset to Off ....................................To change, see page 7
3. Select fan setting: Preset to Auto .......................................To change, see page 8
4. Program schedules: Preset to energy-saving levels
while you’re at work or asleep........................................To change, see pages 9-12
ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and
manually adjust the temperature (see pages 13-14).

Operating Manual
69-2579EF—03 4
M32700
Heat Off Cool Auto On
Fan
Quick reference to controls
Temperature
adjustment (see
page 13-14)
Screen Lit for 12 seconds when you press any button.
Fan Switch (see page 8)
On: Fan runs continuously.
Auto: Fan runs only when heating or cooling system
is on.
Set: Press to set time/
day/schedule.
Hold: Press to override
programmed tempera-
ture control.
Run: Press to resume
program schedule.
System switch (see page 7)
• Heat: Heating system control.
• Off: All systems off.
• Cool: Cooling system control.

RTHL2510/RTHL2410
5 69-2579EF—03
M32701
We
Lo
Batt
Wake
Set
am
Heat
75
On
6:30
Quick reference to display screen
Low battery warning
(see page 17)
Setpoint indicator
Appears when the
setpoint temperature
is displayed.
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 system is on.
Heat on: Heating system is on.
Aux On: Auxiliary heat is activated.
WhenHeatOnorCoolOnisflashing,compressorprotectionisengaged(seepage15).
Current day/time
(see page 6)
Current program period
Wake/Leave/Return/Sleep
(see pages 9-10)

Operating Manual
69-2579EF—03 6
Set Time
am
6:30
M32702
Set Day
We
M32703
Set the time and day
1. Press the SET button, then press s or t
to set the clock time.
2. Press the SET button, then press s or t
to select the day of the week.
3. Press RUN to save & exit.
Note: If the clock flashes, the thermostat will follow
your settings for the Monday “Wake” time period
until you reset the time and day.
Press SET, then adjust time.
Press SET, then select current day.

RTHL2510/RTHL2410
7 69-2579EF—03
M32700
Heat Off Cool Auto On
Fan
Select the system setting
The SYSTEM switch can be set to control
your heating or cooling system, depending
on the season.
• Cool: Cooling system control.
• Off: All systems are off.
• Heat: Heating system control.
Set SYSTEM switch to control the
heating or cooling system.
CAUTION: EQUIPMENT DAMAGE
HAZARD. To prevent possible
compressor damage, do not operate
cooling system when outdoor
temperature is below 50°F (10°C).

Operating Manual
69-2579EF—03 8
Select the fan setting
Set the FAN switch to Auto or On.
In “Auto” mode (the most commonly used
setting), the fan runs only when the heating
or cooling system is on.
Ifsetto“On,”thefanrunscontinuously.
Set FAN switch to choose whether the fan
runs continuously or only as needed.
M32700
Heat Off Cool Auto On
Fan

RTHL2510/RTHL2410
9 69-2579EF—03
Save money by setting program schedules
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.
Set to the time you awaken and the temperature you want
during the morning, until you leave for the day.
Set to the time you leave home and the temperature you
want while you are away (usually an energy-saving level).
Set to the time you return home and the temperature you
want during the evening, until bedtime.
Set to the time you go to bed and the temperature you want
overnight (usually an energy-saving level).
WAKE
6:00 am
70 °
LEAVE
8:00 am
62 °
RETURN
6:00 pm
70 °
SLEEP
10:00 pm
62 °

Operating Manual
69-2579EF—03 10
About your new thermostatEnergy saving settings for maximum cost savings
This thermostat is pre-set to use energy saving program settings. We recommend these
settings, since they can reduce your heating/cooling expenses. (See next page 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)
Cool (Mon-Fri)Heat (Mon-Fri) Heat (Sat-Sun) Cool (Sat-Sun)
70 °78 °70 °78 °
62 °85 °62 °85 °
70 °78 °70 °78 °
62 °82 °62 °82 °

RTHL2510/RTHL2410
11 69-2579EF—03
Mo
Wake
Set Schedule
Set
am
75
6:30
M32704
To adjust program schedules (RTHL2510)
1. Press SET until Set Schedule is displayed.
2. Press s or t to set your Wake time for the
day displayed, then press SET.
3. Press s or t to set the temperature for this
time period, then press SET.
4. Set time and temperature for the next time
period (Leave). Repeat steps 2 and 3 for each
day’s time period.
5. Press RUN to save & exit.
Note: Make sure the thermostat is set to the system
you want to program (Heat or Cool).
Press SET 3 times, then adjust time.
Press SET, then set desired temperature.

Operating Manual
69-2579EF—03 12
Mo Tu We Th Fr
Wake
Set Schedule
Set
am
75
6:30
M32706
To adjust program schedules (RTHL2410)
1. Press SET until Set Schedule is displayed.
2. Press s or tto set your weekday Wake time
(Mo-Fr), then press SET.
3. Press s or t to set the temperature for this
time period, then press SET.
4. Set time and temperature for the next time
period (Leave). Repeat steps 2 and 3 for each
weekday time period.
5. Press SET to set weekend time periods (Sa &
Su), then press RUN to save & exit.
Note: Make sure the thermostat is set to the system
you want to program (Heat or Cool).
Press SET 3 times, then adjust time.
Press SET, then set desired temperature.

RTHL2510/RTHL2410
13 69-2579EF—03
About your new thermostat
Temporary
Wake
Set
am
70
6:30
M32708
Set
am
75
6:30
M32709
Program schedule override (temporary)
Press s or t to immediately adjust the
temperature. This will temporarily override
the temperature setting for the current time
period.
“Temporary” will appear on the display and
the current program period will flash.
The new temperature will be maintained
only until the next programmed time period
begins (see page 9).
To cancel the temporary setting at any time,
press RUN.
Press to temporarily adjust temperature.
Press to cancel temporary setting and
resume program schedule.
Note: Make sure the thermostat is set to the
system you want to control (heat or cool).

Operating Manual
69-2579EF—03 14
About your new thermostat
Hold
Set
am
70
6:30
M32710
Set
am
75
6:30
M32709
Program schedule override (permanent)
Note: Make sure the thermostat is set to the system
you want to control (heat or cool).
Press to permanently adjust temperature. Press HOLD to permanently adjust
the temperature. This will override the
temperature settings for all time periods.
The “Hold” feature turns off the program
schedule and allows you to adjust the
thermostat manually, as needed.
Whatever temperature you set will be
maintained 24 hours a day, until you
manually change it, or press RUN to cancel
“Hold” and resume the program schedule.
Press to cancel “Hold” setting and resume
program schedule.

RTHL2510/RTHL2410
15 69-2579EF—03
About your new thermostatBuilt-in compressor protection
This feature helps prevent damage to the com-
pressor in your air conditioning or heat pump
system.
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displaywillflashthe
message CoolOn (or HeatOn if you have
a heat pump). When the safe wait time has
elapsed, the message stops flashing and the
compressor turns on.
Message flashes until safe restart
time has elapsed.
We
Wake
am
Cool
75
On
6:30
M32711

Operating Manual
69-2579EF—03 16
About your new thermostat
Early Start: This feature allows the heating or
cooling to turn on before the program start
time, so the temperature is reached at the time
you set. For example: Set the Wake time to 6
am, and the temperature to 70°. The heat will
come on before 6 am, so the temperature is
70° by the time you wake at 6. The next time
period is displayed when the system is acti-
vated before a scheduled time period.
Early Start
We
Wake
am
Cool
75
On
6:30
M32712

RTHL2510/RTHL2410
17 69-2579EF—03
Battery replacement
Install two fresh AAA batteries when
Lo Batt flashes on the screen. Lo Batt
appears for 60 days before the batter-
ies 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.
Pull at bottom to
remove thermostat
from wallplate.
Turn thermostat over,
insert fresh AAA alkaline
batteries, then reinstall
thermostat.
SettheSystemswitchtoOffbeforeremovingthe
batteries.Otherwise,theheating/coolingsystemcould
remain activated even when batteries are removed.
RTHXXXX
M32707
W/
Aux
Not
Used
Heat Off Cool Auto On
Fan
M32705

Operating Manual
69-2579EF—03 18
RTHXXXX
M32707
W/
Aux
Not
Used
Heat Off Cool Auto On
Fan
M32705
Customer assistance
For assistance with this product, please visit
http://yourhome.honeywell.com.
OrcallHoneywellCustomerCaretoll-free
at 1-800-468-1502.
To save time, please note your model num-
ber and date code before calling.
Turn thermostat over to
find model number and
date code.
Pull at bottom to
remove thermostat
from wallplate.