Honeywell Home THX9421R5021WW PrestigeTouch Screen Thermostat
Programming and Operation
Quick reference: residential use
Quick reference: light commercial use
Setting the time/date
- Touch the current time. The screen displays Set Time/Set Date.
- Touch Set Time or Set Date.
- Touch until the proper time/ date is displayed.
- Touch Done to save or Cancel to ignore changes.
NOTE: The thermostat will automatically switch to and from Daylight Saving Time.
NOTE: When used with the RedLINK Gateway, time/date is updated via the Internet. For some software versions of Prestige, installation without Gateway does not allow you to adjust time for 72 hours unless you remove the coin cell battery for a minute and then re-insert it.
Setting the fan
Setting the time/date
- Touch FAN to display fan settings.
- Touch On, Automatic, Circulate or Follow Schedule.
- Touch Done to save and exit.
- On: The fan is always on.
- Automatic: The fan runs only when the heating or cooling system is on.
- Circulate: The fan runs randomly about 35% of the time (residential use only).
- Follow Schedule: Fan controlled by the program (see pages 5–7).
NOTE: In commercial use, touch Auto or On to temporarily override the programmed fan schedule.
Setting system mode
- Touch the SYSTEM to display system settings.
- Touch desired option:
- Heat: The thermostat controls only the heating system.
- Cool: The thermostat controls only the cooling system.
- Off: Heating/cooling systems are off.
- Automatic: The thermostat selects heating or cooling as needed depending on the indoor temperature.
Emergency Heat (heat pumps with aux. heat): Controls auxiliary/ emergency heat. The compressor is locked out.
- Touch Done to save and exit.
NOTE: The Automatic and Emergency Heat system settings may not appear, depending on how your thermostat was installed.
Preset energy-saving schedules
This thermostat uses default Energy Saver settings that can reduce your heating/cooling expenses. To customize settings, see next page.
Adjusting program schedules
- Touch MENU.
- Select Create/Edit Schedule.
- Touch Guide Me to create a schedule by answering simple questions.
- Touch I’ll do it myself to manually create a program schedule.
- Touch View/Edit to view the full schedule and make a quick adjustment.
NOTE: To reduce costs, use the preset Energy Saver settings described on page 5.
- Select the days to schedule, and touch Next.
- Touch Wake to set your Wake time for the selected day(s).
- Touch set Heat and Cool temperatures for the Wake period, then touch Done.
- Touch other time periods (Leave, Return, Sleep) to set time and temperatures for each.
- Touch Done to save and exit.
NOTE: Touch Delete Period to eliminate any unwanted time period.
NOTE: Touch Fan Settings to customize fan settings for any time period.
Overriding schedules: residential use
- Touch to adjust the temperature (right side of the screen) and the Hold Until time (left side). The schedule will resume when the Hold Until time expires.
- Touch Switch to Permanent Hold to keep the same temperature until you change it or resume the program schedule.
- Touch Cancel Hold at any time to resume the program schedule.
Overriding schedules: commercial use
Touch to adjust the temperature. It will be maintained until the hold time you set.
- To change the hold time, touch the Hold Until arrow buttons. This time can be adjusted up to the maximum time set by the installer.
- Touch Override to use a pre-set occupied temperature if a person uses the room during an unoccupied period. The new temperature will be maintained for 1 hour and can be adjusted up to the maximum time set by the installer.
The programmed schedule will resume when the override timer expires. Touch Cancel Hold at any time to resume the program schedule.
Viewing equipment status
- Touch MENU.
- Select Equipment Status.
- Touch to view the status of all the equipment your thermostat is controlling. 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.
Setting vacation hold: residential use
This feature helps you save energy while you are away, and restores comfortable settings just before you return home.
- Touch MENU.
- Select Vacation Mode.
- Touch to select the date you leave, then touch Next for further scheduling details, including times of day, temperature settings, return date, and return settings.
- Review your selections on the last display, and touch Done to save your settings. Touch Back, then Cancel to ignore the changes.
Setting holiday/event schedules: commercial use
This feature helps you conserve energy when the workplace is unoccupied for special events and holidays.
- Touch MENU.
- Select Holiday/Event Scheduler.
- Select the item you want to schedule.
- Custom Events lets you set up other days for special schedules.
- US and Canadian Holiday options let you select from a list of holidays commonly observed in each country.
- Make selections as prompted on each screen. For more information, see next two pages.
- Touch Done to save your settings.
Setting custom events: commercial use
This feature lets you customize temperature settings to be maintained during a specific event. You can set up an event for a specific date or day in a month. The thermostat resumes normal scheduling after the event.
- Select Custom events from the Holiday/ Event Scheduler menu.
- Select Create a new event.
- Select a Specific Date or Month/Weekday.
- For a Specific Date, you are prompted to select the start date, settings, end date, and frequency for the event.
- For Month/Weekday, you are prompted to select the month, day of the week, week of the month, settings, length of event, and frequency of the event.
- Review the settings and touch Done to save them. Touch Back, then Cancel to ignore the changes.
Setting holiday schedule: commercial use
This feature lets you customize temperature settings to be maintained on specified national holidays. The thermostat resumes normal scheduling between selected holidays.
- Select US Holidays or Canadian Holidays from the Holiday/Event Scheduler menu.
- Select Add/Edit Holidays. A list of national holidays is displayed.
- Touch the check box next to each holiday for which you want to maintain specific settings, (Touch s or t to scroll through the holiday list.) then touch Next. Set the holiday schedule for Occupied or Unoccupied temperatures, depending on whether the building will be in use.
- Touch s or t to select the Heat and Cool temperatures.
- Review the settings and touch Done to save them. Touch Back, then Cancel to ignore the changes.
Setting holiday override: commercial use
This feature lets you customize temperature settings to be maintained from now until a specified date. The thermostat resumes normal scheduling on the date you select.
- touch MENU.
- Select Holiday Mode to display temperatures while you are away on holiday.
- Touch to select the Heat and Cool temperatures, then touch Next to select return date.
- Review the settings and touch Done to save them. Touch Back, then Cancel to ignore the changes.
NOTE: The cool temperature can only be set higher than the unoccupied program setting and the heat temperature can only be set lower than the unoccupied program setting.
Initiating occupancy mode: commercial use
This feature keeps the temperature at an energy-saving level until you touch Press to start occupancy. When you arrive, touch the button to maintain a comfortable temperature while the room is occupied.
Touch the buttons to set the temperature or the 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.
NOTE: This feature is available only when programmed by the installer.
Remote setback (commercial use)
During Occupied program periods, an occupancy sensor directs the thermostat to go to REMOTE SETBACK settings when the room is empty. If someone is in the room, it uses the Occupied program period settings. The thermostat ignores the occupancy sensor during Unoccupied program periods. If the thermostat is set up to be non-programmable, the sensor directs the thermostat to go to REMOTE SETBACK settings when the room is empty. If someone is in the room, then it follows the settings set by the user. Depending on how your thermostat was installed, it may delay for up to 30 minutes before switching to REMOTE SETBACK settings. This delay allows the room to stay comfortable if the room is unoccupied for only a short time.
Adjusting humidification settings
- Touch MENU and select Humidification.
- Select Auto.
- Move the slider bar to select the humidity level.
- Touch More Settings if frost or condensation appears on the windows. Use a lower number to prevent frost or condensation. Use a higher number if indoor air is too dry. Window Protection limits the amount of humidity to prevent frost or condensation on windows. See notes below.
- Touch Done to save your settings. Touch
Cancel to ignore changes.
NOTE: The thermostat will not run the humidifier when the indoor humidity has reached the “Window Limit” that is displayed on the screen.
NOTE: Window Protection is available only if an outdoor air sensor is installed.
Adjusting dehumidification settings: residential use
This feature can control a dehumidifier or use your air conditioner to reduce humidity.
- Touch MENU and select Dehumidification.
- Select Auto.
- Move the slider bar to select the humidity level.
- Touch Done to save your settings. Touch Cancel to ignore changes.
NOTE: If your air conditioner is used to control humidity, the temperature may drop up to 3° F below your temperature setting until humidity reaches the desired level.
Adjusting dehumidification settings: commercial use
This feature can control a dehumidifier or use your air conditioner to reduce humidity.
- Touch MENU and select Dehumidification.
- Select Auto.
- Move the slider bar to select the humidity level.
- Touch Done to save your settings. Touch Cancel to ignore changes.
If your air conditioner is used to control humidity, the thermostat may use the following methods to maintain 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.
Adjusting ventilation settings
- Touch MENU, and select Ventilation.
- Touch Setting, then select:
- Auto: Ventilation runs as programmed by the installer.
- Off: Ventilation remains off unless turned on using the timer.
- On: Ventilation is always on.
- Touch to run ventilation temporarily. To turn it off, set it to zero.
- Touch More Settings to set maintenance reminders and lockouts. Select Yes to prevent ventilation from running during Sleep or Unoccupied (commercial) program periods or when outdoor conditions exceed values set by the installer.
NOTE: 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.
Setting preferences
Preference menu options let you select how the thermostat displays information or responds to certain situations.
- Touch MENU and select Preferences.
- Select an option and follow the prompts:
- 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 the default schedule
- Daylight saving time
- Touch Done to save your settings. Touch Cancel to ignore changes.
Cleaning the thermostat screen
When you select the Clean Screen option, the screen is locked so you don’t accidentally change settings while you clean.
- Touch MENU.
- Select Clean Screen. A prompt asks if you want to clean the screen for 30 seconds.
- Touch Yes. A countdown timer displays elapsed time until the screen is reactivated.
NOTE: 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.
Adjusting security settings
You can adjust security options to prevent unauthorized changes to system settings.
- Touch MENU and select Security Settings.
- Select Change Lock Mode.
- Select an option and follow the prompts:
- Unlocked: Full access allowed.
- Partially locked: Only temperature can be changed.
- Fully locked: No access allowed.
NOTE: If you choose to use a password for additional security, write it here for reference:
Viewing dealer information
Check dealer information if you need to contact your installer for maintenance, repairs, or upgrades.
- Touch MENU.
- Select Dealer Information.
- Touch Done to return to the menu.
Advanced features
- Adaptive Intelligent Recovery (residential use only)—Over time, the Presitge® thermostat “learns” how long it takes your system to reach the temperature you want. It turns on the heating or cooling system earlier to make sure you’re comfortable at the time you expect. The thermostat displays “In Recovery” when it turns the system on early.
- Dehumidification Away Mode—Your system can be set to control the 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 that protect your home and possessions. When you return, press Cancel to resume normal operation.
- Compressor Protection—The thermostat keeps the compressor off for a few minutes before restarting, to prevent equipment damage. During this “off” time, 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.
Installer options
Installer Options require a password and should only be changed by a qualified technician.
To prevent unintended changes or damage to your equipment, do not change these options yourself.
Replacing outdoor sensor batteries
Replace batteries in your outdoor sensor when a warning appears on the thermostat screen, about 60 days before the batteries are depleted.
To replace the batteries:
- Remove the sensor from the bracket.
- Detach cover.
- Insert 2 fresh AA lithium batteries.
- Replace the cover and set the sensor back into the bracket.
The outdoor sensor will restore communication with the thermostat a few seconds after new batteries are installed.
Replacing indoor sensor batteries
Replace batteries in your indoor sensor when a warning appears on the thermostat screen, about 60 days before the batteries are depleted. When the sensor status light begins flashing red, battery power is critically low and will be depleted within 2–3 weeks. During normal operation, the status light remains off.
To replace the batteries:
- Remove the sensor from the wallplate.
- Install 2 fresh AAA alkaline batteries. If the status light flashes green, the batteries are good; if it flashes red, you must use fresh batteries.
- Attach sensor to wallplate. The sensor will restore communication with the thermostat a few seconds after new batteries are installed.
Using the temperature display
In some circumstances, the temperature displayed on the Home screen may not match the temperature near the thermostat. If your system is set up to use remote indoor sensors, it may be reading a sensor in another location.
Using the humidity display
In some circumstances, the humidity displayed on the Home screen may not match humidity near the thermostat. Some systems are set up to use two sensors, one to control humidification, the other for dehumidification. These sensors are often installed in different locations. Depending on how your thermostat was installed, the thermostat Home screen will display humidity readings from only one sensor.
Optional accessories
- Portable Comfort Control
If you have only one thermostat, you move this remote control from room to room (like a portable thermostat), to make sure the temperature is comfortable in the room you’re using. If you have multiple thermostats, you can view and adjust the temperature in each room from your armchair. - Wireless Outdoor Sensor
With a wireless outdoor sensor, your Prestige® thermostat can display outside temperature and humidity. This information can also be displayed on your handheld Portable Comfort Control. - Wireless Indoor Sensor
If an indoor sensor is installed, your Prestige® thermostat will respond to temperature and humidity readings at the sensor location – providing comfort where the sensor is located. With multiple sensors, the thermostat can average temperature readings from each, to optimize comfort throughout your home. - RedLINK™ Internet Gateway
The RedLINK Internet Gateway gives you remote access to your Prestige® thermostat from the web, smartphone or tablet. You can view or adjust the indoor temperature, system model and other settings. The Gateway can also send alerts to as many as 6 email addresses to notify you if a problem occurs. - Wireless Entry/Exit Remote
This device mounts beside your door for one-touch control. Press Away to control to an energy-saving temperature when you leave home. Press Home to control to a comfortable temperature when you return. To change pre-set temperatures, go to MENU > Entry/Exit Remote Settings. - Wireless Vent and Filter Boost Remote
This device mounts anywhere in your home (typically bathroom or kitchen) for convenient, on-demand ventilation. For increased ventilation, select 20, 40, or 60 minutes.
Troubleshooting
If you have difficulty with your thermostat, try these suggestions. Most problems can be corrected quickly and easily.
Screen is blank
- Check the circuit breaker and reset if necessary.
- Make sure the power switch at the heating and cooling system is on.
- Make sure the furnace door is closed securely.
The screen is difficult to read
- Change screen brightness using the Preferences menu (see page 14).
- At 2 am each day, Prestige thermostats change screen colors for an hour, to prevent burn-in. Touch the screen at any time to restore preset screen colors.
The heating or cooling system does not respond
- Touch the SYSTEM to set the system to Heat. Make sure the temperature is set higher than the Inside temperature.
- Touch the SYSTEM to set the system to Cool. Make sure the temperature is set lower than the Inside temperature.
- Check the circuit breaker and reset if necessary.
- Make sure the power switch at the heating & cooling system is on.
- Make sure the furnace door is closed securely.
- If “Waiting For Equipment” is displayed, the compressor protection timer is on. Wait 5 minutes for the system to restart safely, without damaging the compressor.
Up to 5-year limited warranty
Resideo warrants this product, excluding battery, to be free from defects in workmanship or materials, under normal use and service, for a period of five (5) years from the date of first purchase by the original purchaser. If at any time during the warranty period the product is determined to be defective due to workmanship or materials, Resideo shall repair or replace it (at Resideo’s option).
If the product is defective,
- return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
- call Resideo Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Resideo Return Goods, 1985 Douglas Dr. N., Golden Valley, MN 55422, or whether a replacement product can be sent to you.
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Resideo that the defect was caused by damage that occurred while the product was in the possession of a consumer. Resideo’s sole responsibility shall be to repair or replace the product within the terms stated above.
RESIDE SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you. THIS WARRANTY IS THE ONLY EXPRESS WARRANTY RESIDEO MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE FIVE-YEAR DURATION OF THIS WARRANTY.
Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have any questions concerning this warranty, please write Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.
Regulatory information
FCC Compliance Statement (Part 15.19) (USA only)
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
- This device may not cause harmful interference, and
- This device must accept any interference received, including interference that may cause undesired operation.
FCC Warning (Part 15.21) (USA only)
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. FCC Interference Statement (Part 15.105 (b)) (USA only) This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Equipment interface module, thermostats and outdoor sensor
To comply with FCC and Industry Canada RF exposure limits for general population/ uncontrolled exposure, the antenna(s) used for these transmitters must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna.
Portable Comfort Control
This portable transmitter with its antenna complies with FCC and Industry Canada RF exposure limits for general population/ uncontrolled exposure. This device must not be co-located or operating in conjunction with any other antenna or transmitter.
Section 7.1.2 of RSS-GEN
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.
Section 7.1.3 of RSS-GEN
Operation is subject to the following two conditions:
- This device may not cause interference, and
- This device must accept any interference, including interference that may cause undesired operation of the device.
Honeywell Home THX9421R5021WW PrestigeTouch Screen Thermostat User Guide
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