Honeywell RTH7400 series User manual

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

Read and save these instructions.
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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.