Honeywell Home RTH2300 Series Programmable Thermostat Owner’s Manual

RTH2300/RTH221 Series

Programmable Thermostat
Owner’s Manual

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 pump
• Millivolt system
• Central heating and cooling system
• Heat pump without auxiliary/backup heat

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.

NO MERCURY NO BOTE MERCURIO

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).

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 Power to Heating/Cooling System

Remove Old Thermostat

Remove old thermostat but leave wallplate with wires attached.

**** If you have an older thermostat with a sealed mercury tube, turn to page 2 for proper disposal instructions.

Label Wires with Tags

Label the wires using the supplied wire labels as you disconnect them.

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 will be 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 (a piece of wire) between Y and W if you are using a heat pump without auxiliary/backup heat.

Install Batteries

Set 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.)

Install Thermostat  onto Wallplate

Install thermostat onto the wall plate on the wall.

Turn Power Back On

Turn the power back on to the heating/cooling system.

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.

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 the system setup, press and hold both the and t buttons until the display changes (approximately 5  econds).

Changing Settings

1. Press the or t button to change the setting.
2. Press the and t buttons simultaneously for one second to advance to the next function.
3. 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.

Function| Description Press the button to|

Setting

---|---|---
5| select your heating system and optimize its operation| 5 Gas or oil furnaces: Use this setting if you have a standard gas or oil furnace that is less than 900/0 efficient.
6 Electric furnace: Use this setting if you have any type of electric heating system.
3 Heat pump, hot water, or high-efficiency furnace: Use this setting if you have a hot water system or a gas furnace of greater than 900/0 efficiency.
2 Gas/oil steam or gravity system: Use this setting if you have a steam or gravity heat system.
14| select Fahrenheit or Celsius temperature display| 0 Fahrenheit temperature display (°F)
1 Celsius temperature display (°C)
15*| select Compressor Protection settings| 1 On 0 Off
20| select clock display| 0 12-hour display
1 24-hour display
21 (RTH2300 only)| select Change Filter Timer| 0 Off
1 30 days
2 90 days
3 6 months
4 9 months
5 1 year
40 (RTH2300 only)| restore program schedule to default settings| 0 Off
1 On Program schedule default settings is listed on page 11.

* Compressor Protection: This feature forces the compressor to wait approximately 5 minutes before restarting, to prevent equipment damage. During the wait time, the message “Cool On” or “Heat On” flashes on the screen.

About your new thermostat

Your new thermostat has been designed to give 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 the setpoint temperature
• Preset program settings
• Temporary and permanent override of schedule
• Built-in compressor protection

Thermostat controls

Display screen

Set the time and day

1. Press the SET button, then press or t to set the clock time.
2. Press the SET button, then press or t to select the day of the week. (RTH2300 only)
3. Press RUN to save & exit.

NOTE: If the clock flashes, the thermostat will follow your settings for the Monday “Wake” time 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 pre-set settings (shown in the table below), since they can reduce your heating/cooling expenses.

Heat

|

Cool

---|---
Wake (6:00 am)| 70°| 78°
Leave (8:00 am)| 62°| 85°
Return (6:00 pm)| 70°| 78°
Sleep (10:00 pm)|  62°| 82°

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 then 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).

To adjust program schedules (RTH2300)

1. Press SET until Set Schedule is displayed.
2. Press or t to set your weekday Waketime (Mo-Fr), then press SET.
3. Press or t to set the temperature for this time period, then press SET.
4. Set time and temperature for the next time period (Leave). Repeat steps 2 and 3 for each weekday time period.
5. 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)

1. Press SET until Set Schedule is displayed.
2. Press or t to set your Waketime (Mo-Su), then press SET.
3. Press or t to set the temperature for this time period, then press SET.
4. Set time and temperature for the next time period (Leave). Repeat steps 2 and 3 for each time period.
5. 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 time 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 time 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 time 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

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.

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 Lo Batt 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 non-volatile (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.

Electrical Ratings

Troubleshooting

If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.

Make sure the temperature is set higher than the Inside temperature.
• Set 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” is flashing| • Compressor 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” is not displayed| • 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

Resideo Technologies Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
http://honeywellhome.com/support
33-00102ES—05 M.S. Rev. 08-20 | Printed in the United States

© 2020 Resideo Technologies, Inc. All rights reserved.

The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies, Inc. and its affiliates. Todos los derechos reservados. La marca commercial Honeywell Home se utiliza bajo licencia de Honeywell International, Inc. Este producto es fabricado por Resideo Technologies, Inc. y sus afiliados.

33-00102ES-05

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