Prestige® THX9321/9421
Touch-screen Thermostat
Operating
Manual
69-2493EFS-01
About your new thermostat
Your new thermostat is pre-programmed and ready to go. Just check the settings
below and change if needed:
1. Set date and time ..................................................................................See page 4
2. Select fan setting ..................................................................................See page 5
3. Select system setting ...........................................................................See page 6
4. Program schedules: Preset for maximum cost savings ............. See pages 7-10
5. Set humidification & dehumidification controls ................... See pages 17-19
ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and manually
adjust the temperature (see pages 9-10).
Need Help?
For assistance please visit http://yourhome.honeywell.com, or call toll-free:
1-800-468-1502 (if product is used in a home)
1-888-245-1051 (if product is used in a workplace)
Read and save these instructions.
® U.S. Registered Trademark.
Copyright © 2011 Honeywell International Inc.
All rights reserved.
Table of contents
Prestige® THX9321/THX9421 Thermostat
Programming & Operation
Quick reference ..................................2
Date/time settings ..............................4
Fan settings ........................................5
System settings .................................. 6
Energy Saver settings ........................7
Using program schedules ..................8
Schedule overrides ............................. 9
Menu options
System status ................................... 11
Vacation/event scheduler .................12
Humidity controls .............................17
Ventilation controls ...........................20
CAUTION: EQUIPMENT DAMAGE HAZARD. To prevent possible compressor damage, do not
operate cooling system when outdoor temperature is below 50˚F (10˚C).
This thermostat contains a Lithium battery which may contain Perchlorate material.
Special handling may be required. See www.dtsc.ca.gov/hazardouswaste/perchlorate.
Preferences menu.............................21
Temporary schedule changes ..........22
Screen cleaning ................................23
Security settings ............................... 24
Installer contact information ............ 25
Advanced features ...........................26
Appendices
Installer options ................................ 27
Battery replacement .........................28
Humidity display ............................... 30
Optional accessories ........................ 31
In case of difficulty ...........................34
Limited warranty ............................... 35
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Quick reference: residential use
Display
home screen
Change date or
time (see page 4)
Outdoor temperature
and humidity
Current system
status
Outdoor temperature and humidity are displayed
only if an optional outdoor air sensor is installed.
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2
Control fan operation
(see page 5)
Current program status
Select system
type (see page 6)
Display menu
options (see
pages 11-26)
Adjust
temperature
settings (see
pages 9-10)
Indoor temperature and humidity
Quick reference: commercial use
Prestige® THX9321/THX9421 Thermostat
Display
home screen
Change date or
time (see page 4)
Outdoor temperature
and humidity
Current system
status
Press to override program temporarily
Outdoor temperature and humidity are displayed
only if an optional outdoor air sensor is installed.
Control fan operation
(see page 5)
Select system
type (see page 6)
Thermostat location and
current program status
3
Display menu
options (see
pages 11-26)
Adjust
temperature
settings (see
pages 9-10)
Indoor
temperature
and humidity
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Operating Manual
Date/time settings
Press date/time display
Press to select date or time
Press arrow buttons to change
MCR32960
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4
To set the date or time, press the
date/time display, then select SET TIME
or SET DATE.
Press the s or t buttons until the
proper time/date is displayed, then
press DONE to save and exit (or press
CANCEL to exit without changing the
time).
The thermostat will switch to and from Daylight
Saving Time automatically.
Fan settings
Prestige® THX9321/THX9421 Thermostat
Press FAN
FAN
Press any displayed option
Automatic
fan idle
In commercial use, the CIRCULATE option is
not available.
MCR32961
MCR32962
• On: Fan is always on.
• Automatic: Fan runs only when
heating or cooling system is on.
• Circulate: Fan runs randomly,
about 35% of the time (residential
models only).
• Follow Schedule: Fan controlled
by program (see pages 7-8).
In commercial use, press AUTOMATIC or ON
to temporarily override the programmed fan
schedule.
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System settings
Press SYSTEM
SYSTEM
MCR32963
Press any displayed option
Automatic
MCR32964
Press HELP for more information about
these options.
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Press SYSTEM, then select any option
(press s or t to scroll menu):
• Heat: Thermostat controls only the
heating system.
• Cool: Thermostat controls only the
cooling system.
• Automatic: Thermostat selects
heating or cooling as needed.
• Off: Heating and cooling system is
off. Fan will still operate if fan is set
to On or Circulate.
• Emergency Heat (only for
heat pumps with auxiliary heat):
Thermostat controls Auxiliary Heat.
Compressor is not used.
Prestige® THX9321/THX9421 Thermostat
Energy Saver settings for maximum cost savings
These default Energy Saver settings can reduce expenses by as much as 33%.
(See next page to customize each time period.)
Heat
(Mon-Fri)Period
Cool
(Mon-Fri)Start time
Heat
(Sat-Sun)
Cool
(Sat-Sun)
Wake
Leave
Return
Sleep
Residential Use
Occupied 1
Unoccupied 1
Occupied 2*
Unoccupied 2*
Commercial Use
* Period 2 is cancelled by default. If you activate it, the values shown above are default settings.
6:00 am
8:00 am
6:00 pm
10:00 pm
8:00 am
10:00 pm
12:00 am
12:00 am
70° 78° 70° 78°
62° 85° 62° 85°
70° 78° 70° 78°
62° 82° 62° 82°
Cool Start time Heat Period Fan
70° 75° On
55° 85° Auto
70° 75° On
55° 85° Auto
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To adjust program schedules
Press MENU
MENU
MCR32965
Press CREATE/EDIT SCHEDULE
Create/Edit Schedule
MCR32966
Press any displayed option
Guide me through
scheduling
MCR32967
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Press MENU, then CREATE/EDIT
SCHEDULE to display options:
• Guide me: This option creates a
schedule for you, by asking simple
questions.
• I’ll do it myself: This is a faster
way to create a schedule manually.
• View/Edit: This displays the full
schedule, so you can make quick
adjustments.
To reduce costs, you should use the pre-set
Energy Saver settings (see page 7).
Press HELP at any menu screen for more
information about schedule options.
Prestige® THX9321/THX9421 Thermostat
Program schedule override: residential use
Press to change temperature
Cancel
Press to set
“hold” time
Press to
cancel
“hold”
Hold
Done
Press to
begin “hold”
MCR32968
Press s or t to change the temperature. It will be maintained until the
“hold” time you set.
Press the PERMANENT HOLD button to
keep the same temperature until you
manually change it or resume the
program schedule.
To cancel these settings at any time,
press CANCEL HOLD.
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Program schedule override: commercial use
Press to activate “occupied” mode
OVERRIDE
MCR32969
Press to change temperature
Cancel
Press to set
“hold” time
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10
Press to
cancel
“hold”
Hold
Done
MCR32970
Press to
begin “hold”
Press s or t to change the
temperature. It will be maintained until
the “hold” time you set.
Press OVERRIDE to use a pre-set
“occupied” temperature if a person is
present during an unoccupied period.
The new temperature will be maintained for at least 1 hour, and can be
adjusted up to the maximum time set
by the installer. To change the time,
press the HOLD UNTIL arrow buttons.
The programmed schedule will resume
when the override timer expires. To
cancel the override at any time, press
CANCEL HOLD.
MCR32971
System status information
Prestige® THX9321/THX9421 Thermostat
Press MENU
Scroll to select EQUIPMENT STATUS
Equipment Status
MENU
MCR32965
Press MENU, then select EQUIPMENT
STATUS.
Depending on how your thermostat
was installed, the Equipment Status
screen can report data about the following systems:
• Heating and cooling
• Fan
• Humidification
• Dehumidification
• Ventilation
• Maintenance reminders
• Thermostat information
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Menu: Vacation scheduling (residential use)
Press MENU
MENU
MCR32965
Scroll to select VACATION
Vacation Mode
MCR32972
Follow screen prompts, then press DONE
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This feature lets you conserve energy
while away, and restores a comfortable
temperature just before you return to
your home.
Press s or t at each screen to enter
temperatures, dates and times as
prompted, then press DONE.
The temperature you set will be
maintained until you return, then the
program schedule will resume.
Prestige® THX9321/THX9421 Thermostat
Menu: Holiday/event scheduling (commercial use)
Press MENU
Scroll to select HOLIDAY / EVENT SCHEDULER
Holiday / Event Scheduler
Choose an option below
MENU
MCR32965
MCR32973
This feature lets you conserve energy
when the workplace is unoccupied for
special events or on holidays.
The US (United States) and CANADIAN
options allow you to select from a list
of holidays commonly observed in
each country. You can set the system
to “unoccupied” or “occupied” mode
for the days you select.
The CUSTOM EVENTS button gives
you more options to customize
temperatures for specific dates and
times in the future.
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Menu: Holiday override (commercial use)
Scroll to select HOLIDAY MODE
Holiday Mode
Follow screen prompts, then press DONE
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MCR32974
Press HOLIDAY MODE to set
temperatures that will be maintained
from now until the date you expect to
return.
The thermostat will resume the normal
schedule on the date you set. You can
press CANCEL at any time to resume
the normal schedule.
The cool temperature setting can only be set
higher than the unoccupied program setting and
the heat temperature setting can only be set
lower than the unoccupied program setting.
Prestige® THX9321/THX9421 Thermostat
Initiate Occupancy mode (commercial use)
This feature keeps temperature at an
energy-saving level until the PRESS TO
START OCCUPANCY button is pressed.
When you arrive, press the button to
maintain a comfortable temperature
while the room is occupied.
Press to start
occupancy
Press to maintain comfortable
temperature while room is occupied
MCR32975
Press the s or t buttons to set the
temperature or “Hold Until” time. The
temperature is maintained until the
time you set. Temperature returns to
an energy-saving level after the timer
expires, or the “Occupied” period ends.
The thermostat keeps temperature at
an energy saving level until OVERRIDE
or PRESS TO START OCCUPANCY button is
pressed.
This feature is available only if it is programmed
by the installer.
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Remote setback (commercial use)
Programmable
During “occupied” periods: If a remote setback switch or sensor is installed,
temperature will be maintained at the level set for the Standby mode when the
switch or sensor is off. When it is on, temperature will be maintained at the level
set for the occupied period.
During “unoccupied” periods: The remote setback switch or sensor is ignored
during unoccupied periods. Temperature will be maintained at the level set for the
unoccupied period.
Non-programmable
If a remote setback switch or sensor is installed, temperature will be maintained
at the level set for the Standby mode when the switch or sensor is off. When it is
on, temperature will be maintained at the level you set manually.
Time delay
Depending on how your thermostat was installed, there may be a time delay of
up to 30 minutes before the system switches from occupied to standby mode.
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Menu: Humidification
Prestige® THX9321/THX9421 Thermostat
Press MENU
MENU
Scroll to select HUMIDIFICATION
Humidification
Set humidity to desired level
Window protection: Thermostat adjusts humidity as
needed to prevent frost or condensation
MCR32965
MCR32976
Move the slider bar to the humidity
level you prefer, then press DONE.
Press MORE SETTINGS if frost or condensation appears on windows. A
lower number adjusts humidity to help
prevent these problems. Use a higher
number if indoor air is too dry.
The Window Protection option is only available
if an optional outdoor sensor is installed.
The thermostat controls humidification and
dehumidification systems as needed to
maintain the desired humidity level. A 15%
separation between settings is maintained to
prevent excessive energy use.
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Menu: Dehumidification (residential use)
Press MENU
MENU
Scroll to select DEHUMIDIFICATION
Dehumidification
Set humidity to desired level
More
Settings
Press to review filter timer
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MCR32965
MCR32977
MCR32978
This feature can control a dehumidifier
or use your air conditioner to reduce
humidity. Move the slider bar to the
humidity level you prefer, then press
DONE.
Press MORE SETTINGS to review or
change settings for the dehumidifier
filter timer.
If your air conditioner is used to control humidity,
temperature may drop as much as 3° F below
the level you set until humidity reaches the
desired level.
The thermostat controls humidification and
dehumidification systems as needed to maintain
the desired humidity level. A 15% separation
between settings is maintained to prevent
excessive energy use.
Prestige® THX9321/THX9421 Thermostat
Menu: Dehumidification (commercial use)
Press MENU
Scroll to select DEHUMIDIFICATION
Dehumidification
Set humidity to desired level
Settings
Press to review filter timer
More
MENU
MCR32965
MCR32977
MCR32978
Move the slider bar to the humidity
level you prefer, then press DONE. If
your air conditioner is used to control
humidity, the thermostat may use the
following methods to maintain your
desired humidity:
• Cool from 1° to 5° F lower than
your temperature setting.
• Run cooling for the minimum “on”
time to reduce humidity.
• Run cooling and heating at the
same time to reduce humidity
without lowering the temperature.
Press MORE SETTINGS to review or
change settings for the dehumidifier
filter timer.
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Menu: Ventilation
Press MENU
MENU
Scroll to select VENTILATION
Ventilation
MCR32965
MCR32979
Set operating mode Set temporary run time
More
Settings
MCR32980
Press to set outdoor lockouts
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Press SETTING to set operating mode:
Auto: Ventilation runs as programmed
by the installer.
Off: Ventilation remains off unless
turned on using the timer.
On: Ventilation is always on.
Press s or t to run ventilation
temporarily. To turn it off, set to zero.
Press MORE SETTINGS to change maintenance reminders, or set outdoor
lockouts (if set to Yes, ventilation
will not run when outdoor conditions
exceed values set by the installer).
If set up for humidification in heat mode, the
ventilator will turn on to remove excess humidity
if 10% or more above your humidity setting.
Menu: Preferences
Prestige® THX9321/THX9421 Thermostat
Press MENU
Scroll to select PREFERENCES
Preferences
Scroll to select desired option
Press HELP for more information about
these options.
MENU
MCR32965
MCR32981
At this screen you can view or change
the following options:
• Reminders to change filters
• Display heat/cool diagnostic alerts
• Utility Schedule options
• Fahrenheit/Celsius display
• 12/24-hour clock display
• Screen color and brightness
• Language choice
• Scheduling options
• Adaptive Intelligent Recovery
• Restore default schedule
• Daylight Saving Time options
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MCR32965
Menu: Temporary schedule changes
Press MENU
MENU
Scroll to select TEMPORARY SCHEDULE CHANGES
Temporary Schedule Changes
MCR32982
Select option, then follow screen prompts
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This feature is useful if your daily
schedule sometimes changes.
Select an option, then follow screen
prompts to conserve energy while
you’re away and maintain a comfortable climate after you return.
After the times you set, the normal
program schedule will resume.
Press HELP for more information about
these options.
See also Program Schedule Overrides
(p age s 9-10).
Menu: Clean screen
MCR32965
Prestige® THX9321/THX9421 Thermostat
Press MENU
Scroll to select CLEAN SCREEN
Clean Screen
Press YES to lock screen for cleaning
MENU
MCR32983
Use this feature to lock the screen so
you can clean it without changing any
settings. A countdown timer will show
elapsed time until the screen is
reactivated.
Do NOT spray any liquid directly on the
thermostat. Spray liquids onto a cloth, then use
the damp cloth to clean the screen. Use water
or household glass cleaner. Avoid abrasive
cleansers.
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Menu: Security settings
Press MENU
MENU
MCR32965
Scroll to select SECURITY SETTINGS
Security Settings
MCR32984
Select option, then follow screen prompts
Press HELP for more information about
these options.
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Security options can be used to prevent unauthorized changes to system
settings.
Lock options:
• Unlocked: Full access allowed.
• Partially locked: Only temperature
can be changed.
• Fully locked: No access allowed.
If you choose to use a password for
additional security, write it here for
reference:
Menu: Dealer Information
Prestige® THX9321/THX9421 Thermostat
Press MENU
Scroll to select DEALER INFORMATION
Dealer Information
MENU
MCR32965
MCR32985
Check this screen if you need to
contact the person who installed your
system, for maintenance, repairs or
upgrades.
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Advanced features
Adaptive Intelligent Recovery (residential use only)
Over time, the Prestige® thermostat “learns” how long it takes your system to provide the temperature you want. It turns on the heating or cooling system earlier to
make sure you’re comfortable at the time you expect.
Dehumidification Away Mode
Your system can be set to control indoor climate while your home is vacant
during the humid season. Before you leave, press MENU, then select
DEHUMIDIFICATION AWAY MODE. Temperature and humidity will be kept at levels
adequate to protect your home and possessions while you are away. When you
return, press CANCEL to resume normal operation.
Compressor Protection
This feature protects your air-conditioning system by forcing the compressor to
pause before restarting, to prevent damage. During this brief pause, the message
“Waiting for Equipment” is displayed on screen.
Pre-occupancy Purge (commercial use only)
This feature turns on the fan 1 to 3 hours before each “occupied” time period, to
provide a comfortable work environment when you arrive.
69-249 3E FS — 01
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Menu: Installer options
Installer Options
MENU
MCR32965
MCR32986
Prestige® THX9321/THX9421 Thermostat
These options should be changed only
by professionally qualified technicians.
To avoid disabling or damaging your
equipment, do not change these
options yourself.
The USB port on the bottom of the
thermostat is for use by professional
installers only. Do not attempt to use
this port yourself.
Press HELP at any screen for more information
about these options.
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Battery replacement: Wireless outdoor sensor
Replace batteries
in your
outdoor sensor
MCR32987
M32988
Remove sensor from bracket, detach cover and install 2 fresh AA lithium batteries
Replace batteries in your outdoor sensor when a warning appears on the
thermostat screen, about two months before batteries are depleted.
After new batteries are installed, the outdoor sensor will restore communication
with the wireless network within a few seconds.
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MCR32937