Honeywell RTH7400 series User manual

Operating
Manual
RTH7400/RTH7500 Series
Programmable Thermostat
69-2222ES-05

Read and save these instructions.
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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.
US Patent No. 6,595,430; 7,114,554; 7,274,972; 7,225,054 and other patents pending
Copyright © 2011 Honeywell International Inc. All rights reserved.
CAUTION: EQUIPMENT DAMAGE HAZARD. To prevent possible compressor damage, do
not operate cooling system when outdoor temperature is below 50°F (10°C).
This manual covers the RTH7400 and RTH7500 models.
(Pull thermostat from wallplate and turn over to find model number)
This thermostat contains a Lithium battery which may contain Perchlorate material.
Perchlorate Material—special handling may apply,
See www.dtsc.ca.gov/hazardouswaste/perchlorate

RTH7400/RTH7500 Series
1 69-2222ES—05
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 ................... 13
Auto Changeover ..................................... 15
Filter reminder .......................................... 17
Special features ....................................... 18
Appendices
Battery replacement ................................ 19
Customer assistance ............................... 20
In case of difficulty................................... 21
Limited warranty ...................................... 23
This thermostat is ready to go!
Your new thermostat is pre-programmed
and ready to go.
See page 3 to check settings.
Table of contents

Operating Manual
69-2222ES—05 2
About your new thermostat
Congratulations! You’ve just purchased the world’s most advanced, easy-to-use ther-
mostat. It has been designed to give you many years of reliable service and climate
control.
Features
• Easy-to-followmenuprogramming.
• 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reminderletsyouknowwhentoreplacefurnacefilter.
• Largedisplaywithbacklightiseasytoread—eveninthedark.
2

RTH7400/RTH7500 Series
3 69-2222ES—05
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 clock ...............................................................................................See page 6
2. Select fan setting: Preset to Auto...................................To change, see page 7
3. Select system setting: Preset to Heat............................To change, see page 8
4. Program schedules: Preset to energy-saving levels
while you’re at work or asleep (assumes you wake at
6 am, leave at 8 am, return at 6 pm and go to bed
at 10 pm) ................................................................... To change, see pages 10–14
ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and
manually adjust the temperature (see pages 13–14).

Operating Manual
69-2222ES—05 4
Quick reference to controls
M28426
Arrow buttons
Press to adjust temperature (see pages 11-14), or to make selections from screen menus.
Clock & More
Press to set clock
(see page 6) or
furnace filter
reminder.
Schedule
Press to set program schedule (see pages 11-12).
System & Fan
Press to select fan
operation (see page
7) or system (see
page 8).

RTH7400/RTH7500 Series
5 69-2222ES—05
Quick reference to status display
System & Fan Schedule Clock & Mode
System
Cool
Fan Auto
Mon
Set to
Heat OnRecovery
AM
75
75
6:01
M28078
Current day of week
Smart Response®
Technology in effect
(see page 15)
Current inside temperature Current time
Temperature setting
System setting
(see page 8) Fan setting
(see page 7)
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)

Operating Manual
69-2222ES—05 6
Clock setting
To set the current time display, press
CLOCK, then press s or tto adjust the
time. Press and hold s or tto advance
the time more quickly.
Press DONE to save & exit (or press GO BACK
to exit without changing 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.
Note: To change the current week
day display, see System Setup in your
Installation Guide.
System & Fan Schedule Clock & More
M28079
Go Back Done
Mon
AM
6:01
M28080
Press CLOCK
Adjust time, then press DONE

RTH7400/RTH7500 Series
7 69-2222ES—05
Fan setting
Press SYSTEM & FAN, then FAN to select fan
operation:
• On: Fan is always on.
• Auto: Fan runs only when the heating or
cooling system is on.
System & Fan Schedule Clock & More
M28081
System Fan Done
System
Heat
Fan Auto
M28082
Press SYSTEM & FAN
Press FAN to select mode, then press DONE

Operating Manual
69-2222ES—05 8
System setting
Follow steps at left to select system:
• Heat: Thermostat controls only the heating
system.
• Cool: Thermostat controls only the cooling
system.
• Auto: Thermostat automatically selects
heating or cooling depending on the indoor
temperature.
• Off: All systems are off.
• Em Heat (only for heat pumps with auxiliary
heat):ThermostatcontrolsEmergencyand
Auxiliary Heat. Compressor is locked out.
System & Fan Schedule Clock & More
M28081
System Fan Done
System
Heat
Fan Auto
M28083
Press SYSTEM & FAN
Press SYSTEM to select mode,
then press DONE
Note: The Auto and EmHeat system
settings may not appear, depending on
how your thermostat was installed.

RTH7400/RTH7500 Series
9 69-2222ES—05
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
69-2222ES—05 10
Energy saving settings for maximum cost savings
This thermostat is pre-set with energy saving program settings. We recommend these
settings, since they can reduce your heating/cooling expenses by as much as 33%.
(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 °

RTH7400/RTH7500 Series
11 69-2222ES—05
To adjust program schedules (RTH7400 only)
1. Press SCHEDULE, then EDIT to see weekdays.
2. Press SELECT DAY to highlight Mon-Fri (they will
share the same settings).
3. Press NEXT STEP twice, then press s or tto set
Wake time for selected days.
4. Press NEXT STEP, then s or tto set Heat
temperature for this time period.
5. Press NEXT STEP, then s or tto set Cool
temperature for this time period.
6. Repeat steps 3-5 to program other time periods
(LEAVE, RETURN, SLEEP), then press DONE.
7. Repeat steps 1-6 to program Saturday/Sunday.
(Press s or tuntil the desired day is flashing,
then press SELECT DAY.)
8. Press DONE to save & exit.
System & Fan Schedule Clock & More
M28084
Go Back Edit View
M28085
Go Back Next Step Done
Period
Wake
MON
TUE
WED
THU
FRI
Set to
Heat
AM
62
6:00
M28086
Select day(s) Select time Select temp
Press SCHEDULE
Press EDIT

Operating Manual
69-2222ES—05 12
To adjust program schedules (RTH7500 only)
1. Press SCHEDULE, then EDIT to see weekdays.
2. Press SELECT DAY. You can select multiple days to
program with the same settings.
3. Press NEXT STEP twice, then press s or tto set
Wake time for selected day(s).
4. Press NEXT STEP, then s or tto set Heat
temperature for this time period.
5. Press NEXT STEP, then s or tto set Cool
temperature for this time period.
6. Repeat steps 3-5 to program other time periods
(LEAVE, RETURN, SLEEP), then press DONE.
7. Repeat steps 1-6 to program any remaining days.
(Press s or tuntil the desired day is flashing,
then press SELECT DAY.)
8. Press DONE to save & exit.
System & Fan Schedule Clock & More
M28084
Go Back Edit View
M28085
Go Back Next Step Done
Period
Wake
MON
TUE
WED
THU
FRI
Set to
Heat
AM
62
6:00
M28086
Select day(s) Select time Select temp
Press SCHEDULE
Press EDIT

RTH7400/RTH7500 Series
13 69-2222ES—05
Program schedule override (temporary)
Press s or tto immediately adjust the
temperature. This will temporarily override
the temperature setting for the current time
period.
The new temperature will be maintained until
the next time period.
When the timer expires, the program schedule
will resume and set the temperature to the
level you’ve programmed for the current time
period.
To cancel the temporary setting at any time,
press USE SCHEDULE.
System & Fan Use
Schedule Clock & More
System
Heat
Fan Auto
MonTemporary
Set to
Heat On
AM
62
68
6:08
M28087
Press USE SCHEDULE to
resume program schedule
Adjust temperature

Operating Manual
69-2222ES—05 14
Program schedule override (permanent)
Press s or tto adjust temperature, then
press HOLD. This will turn off the program
schedule.
Whatever temperature you set will be
maintained 24 hours a day, until you manually
change it, or press USE SCHEDULE to cancel
“Hold” and resume the program schedule.
Hold Cancel
System
Heat
Fan Auto
Permanent Hold
Mon
Set to
AM
62
68
6:08
M28088
Press HOLD to turn off program
schedule and maintain set
temperature
Adjust temperature

RTH7400/RTH7500 Series
15 69-2222ES—05
About your new thermostat
Use this feature in climates where both air conditioning and heating are used on the
same day. When the system mode is in Auto, the thermostat automatically selects
heating or cooling depending on the indoor temperature.
While in the Auto mode, if a schedule override takes place (temporarily or perma-
nently) the thermostat will automatically adjust the cooling and heating settings to
maintain a 3-degree separation between the cool and heat settings.
For example, if the heat temperature is raised to where it gets within 3-dgrees of the
cool setting, the display will show an up arrow next to “cool” to show the thermostat
is raising the cool setting up to maintain a 3-dgreee separation.
The display will also show both “Auto” and either “Heat” or “Cool” for which tempera-
ture setting you are currently adjusting. Press the system button to select between
the heat and cool to view/adjust either mode.
Auto Changeover

Operating Manual
69-2222ES—05 16
About your new thermostatAuto Changeover
If the cool temperature is lowered to where it gets close to the heat setting, an arrow
next to heat will show the thermostat is lowering the heat setting down to maintain a
3-degree separation.
CAUTION: To avoid possible compressor damage, do not use Auto Changeover if the
outside temperature drops below 50°F (10°C).
69
System
Hold
Heat
Cool
Fan Auto
Cancel
Set To
Tue
PM
74
1:09
Temporary
M27486
System Auto
Heat The triangle indicates the cool temperature is
increasing to maintain 3 degrees between heat
and cool settings.

RTH7400/RTH7500 Series
17 69-2222ES—05
About your new thermostat
If activated during installation, the furnace
filter reminder alerts you when it is time to
replace your filter.
Press RESET after changing the filter, to restart
the timer.
To reset the reminder interval before it expires:
1. Press MORE, then NEXT.
2. Press RESET.
3. Press DONE to save and exit.
Reset Schedule Clock & More
System
Heat
Fan Auto
Set to
Change Filter
Heat On
AM
70
70
6:01
M28089
Press MORE to reset reminder interval
Press RESET after changing filter
Filter reminder
Reset Next Done
Days
60
M28090

Operating Manual
69-2222ES—05 18
Special features
Smart Response®Technology: This feature allows the thermostat to “learn” how long the
furnace and air conditioner take to reach programmed temperature settings, 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
message “Recovery” is displayed when the system is activated before a scheduled time period.
Compressor Protection: This feature forces the compressor to wait a few minutes before
restarting, to prevent equipment damage. During the wait time, the message “Wait” is displayed
on screen.
Auto Changeover: This feature is used in climates where both air conditioning and heating are
used on the same day. When the system is set to Auto, the thermostat automatically selects
heating or cooling depending on the indoor temperature. Heat and cool settings must be at
least 3 degrees apart. The thermostat will automatically adjust settings to maintain this 3-degree
separation.
CAUTION: To avoid possible compressor damage, do not use Auto Changeover if the
outside temperature drops below 50°F (10°C).