Honeywell T9 Smart Sensor Thermostat
Identify System Type
This thermostat is compatible with the following systems:
- Gas, oil, or electric furnace
- Central air conditioner
- Hot water system with or without a pump
- Millivolt system
- Central heating and cooling system
- Heat pump without auxiliary/backup heat
Customer assistance
For assistance with this product, please visit http://honeywellhome.com/support. To save time, please note your model number and date code before calling. Pull at the bottom to remove the thermostat from the wallplate. Turn the thermostat over to find the model number and date code.
Turn Off the Power to the Heating/Cooling System
Remove Old Thermostat
Label Wires with Tags
Separate Wallplate from New Thermostat
Remove the wallplate from the new thermostat and mount it onto the wall.
Mount Wallplate
Mount the new wallplate using the included screws and anchors.
- Drill 3/16-in. Holes for drywall
- Drill 3/32-in. holes for plaster
Connect Wires
Simply match wire labels. If labels do not match letters on the thermostat, check “Alternate Wiring” on page 6 and connect to the terminal as shown here (see notes below).
The thermostat does not work on Heat Pumps with auxiliary/backup heat
Alternate Wiring
- If wires are connected to both R and Rc terminals, remove the metal jumper.
- Do not use C or X. Wrap the bare end of the wire with electrical tape.
- If you have a heat pump without auxiliary/backup heat, connect O or B, not both. If you do not have a heat pump, do not connect B. Wrap the bare end of the wire with electrical tape.
- Place a jumper (piece of wire) between Y and W if you are using a heat pump without auxiliary/backup heat.
Install Batteries
Set the fan operation switch
Move the switch to the proper setting: Gas or Oil: For gas or oil heating systems, leave
the fan operation switch in this factory-set position (for systems that control the fan in a call for heat).
Electric or Heat Pump: Change the switch to this setting for heat pump or electric heat systems. (This setting is for systems that allow the thermostat to control the fan in a call for heat, if a fan wire is connected to the G terminal.)
Honeywell-T9-Smart-Sensor-Thermostat-figure-10
Turn Power Back On
If your system type is
If your system type is:
- Single Stage Heat and Cool
- Heat Only or Cool Only
Congratulations, you’re done!
If your system type is:
- Heat pump
- High-efficiency furnace
- Hot water
- Electric furnace
- Gas/oil steam
- Gravity system
Continue with Advanced Installation to match your thermostat to your system type.
For step-by-step guidance on another Wi-Fi model, check the Honeywell RTH9585WF installation guide.
This thermostat works on 24-volt or 750 mV systems. It will NOT work on multistage conventional systems.
Advanced Installation
Enter System Setup
To enter system setup, press and hold both the s and t buttons until the display changes (approximately 5 seconds).
Changing Settings
- Press the s or t button to change the setting.
- Press the s and t buttons simultaneously for one second to advance to the next function.
- Press the RUN button to exit and save settings.
NOTE: If you do not press any button for 60 seconds while you are in the setup menu, the thermostat automatically saves any changes made and exits the menu.
Compressor Protection: This feature forces the compressor to wait approximately 5 minutes before restarting, to prevent equipment damage. During the wait Honeywell T9 Smart Sensor Thermostat time, the message “Cool On” or “Heat On” flashes on the screen.
About your new thermostat
Your new thermostat has been designed to give Honeywell T9 Smart Sensor Thermostat you many years of reliable service and easy-to-use, push-button climate control.
- Backlit display on RTH2300
- Displays ambient (measured) temperature at all times
- One-touch access to setpoint temperature
- Preset program settings
- Temporary and permanent override of the schedule
- Built-in compressor protection
Thermostat controls
Display screen
Set the time and day
- Press the SET button, then press s or t to set the clock time.
- Press the SET button, then press s or t to select the day of the week. (RTH2300 only)
- Press RUN to save & exit.
NOTE: If the clock flashes, the thermostat will follow your settings for the Monday “Wake” period until you reset the time and day.
Program Schedule
You can program four time periods each day. The RTH2300 can be programmed with different schedules for weekdays and weekends. We recommend the preset settings (shown in the table below), since they can reduce your heating/cooling expenses.
- Wake – Set to the time you awaken and the temperature you want during the morning, until you leave for the day.
- Leave – Set to the time you leave home and the temperature you want while you are away (usually an energy-saving level).
- Return – Set to the time you return home and the temperature you want during the evening, until bedtime.
- Sleep – Set to the time you go to bed and the temperature you want overnight (usually an energy-saving level).
NOTE: Leave and Return periods can be canceled on weekends (RTH2300 only).
If you’re looking for simpler scheduling options, see the Honeywell programmable thermostat setup for the RTH2300 model.
To adjust program schedules (RTH2300)
- Press SET until Set Schedule is displayed.
- Press s or t to set your weekday Wake time (Mo-Fr), then press SET.
- Press S or T to set the temperature for this period, then press SET.
- Set time and temperature for the next period (Leave). Repeat steps 2 and 3 for each weekday period.
- 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).
To adjust program schedules (RTH221)
- Press SET until Set Schedule is displayed.
- Press s or t to set your Wake time (Mo-Su), then press SET.
- Press S or T to set the temperature for the tperiodr, then press SET.
- Set time and temperature for the next period (Leave). Repeat steps 2 and 3 for each period.
- Press RUN to save & exit.
NOTE: Make sure the thermostat is set to the system you want to program (Heat or Cool).
Program schedule override (temporary)
Press s or t to immediately adjust the temperature. This will temporarily override the temperature setting for the current 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 period begins (see page 11). To cancel the temporary setting at any time, press RUN.
NOTE: Make sure the thermostat is set to the system you want to control (heat or cool).
Program schedule override (permanent)
Press HOLD to permanently adjust the temperature. This will override the temperature settings for all 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.
NOTE: Make sure the thermostat is set to the system you want to control (heat or cool).
Built-in compressor protection. Change filter (RTH2300 only). This feature helps prevent damage to the compressor 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.
Change filter (RTH2300 only)
If the filter reminder is turned on during installation, the words Change Filter will flash on the screen when the filter needs to be replaced. After you replace the air filter, press and hold the RUN button for 3 seconds to reset the alert.
Battery replacement
Install two fresh AAA batteries when the Low Battery flashes on the screen. Lo Batt appears for 60 days before the batteries are depleted. Replace batteries once a year, or when you will be away for more than a month. Most settings are stored in nonvolatile (permanent) memory. Only the clock and the day must be set after you replace the batteries.
Set the System switch to Off before removing the batteries. Otherwise, the heating/cooling system could remain activated even when batteries are removed.
Turn the thermostat over, insert fresh AAA alkaline batteries, then reinstall the thermostat.
Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.
ou can also explore Honeywell thermostat troubleshooting tips for the RTH8500 series, which covers many common issues.
Display is Blank
- Make sure fresh AAA alkaline batteries are correctly installed.
The heating or cooling system does not respond
- Set the system switch to Heat. Make sure the temperature is set higher than the Inside temperature.
- Set the system switch to Cool. Make sure the temperature is set lower than the Inside temperature.
- Wait 5 minutes for the system to respond.
Temperature settings do not change
Make sure heating and cooling temperatures are set to acceptable ranges:
- Heat: 40° to 90°F (4.5° to 32°C).
- Cool: 50° to 99°F (10° to 37°C).
“Cool On” or “Heat On” flashinghee heater
- or protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor.
“Heat On” is not displayed
- Set the System switch to Heat, and set the temperature level above the current room temperature.
“Cool On” a is is asplayedye.d
- Set the System switch to Cool, and set the temperature level below the current room temperature.
For assistance with this product, please visit
http://honeywellhome.com/support
1-year limited warranty
http://honeywellhome.com/support
Do you need assistance? We are here to help.
Visit http://honeywellhome.com/support for wiring assistance before returning the thermostat to the store.
This thermostat cannot be used on heat pumps with backup heat or on multistage systems.
ATTENTION:
MERCURY RECYCLING NOTICE This product does not contain mercury. However, this product may replace a product that contains mercury. Mercury and products containing mercury should not be discarded in household trash.
For more information on how and where to properly recycle a thermostat containing mercury in the United States, please refer to the Thermostat Recycling Corporation at
www.thermostat-recycle.org.
For mercury thermostat recycling in Canada, please refer to Switch the Stat at
www.switchthestat.ca
NOTICE: To avoid possible compressor damage, do not run the air conditioner if the outside temperature drops below 50°F (10°C).
