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The Honeywell RTH221B1039/U1 is a programmable thermostat designed for residential use. With easy-to-use controls and a clear and simple display, it allows homeowners to adjust their heating and cooling settings according to their preferences. The thermostat features 4 programming periods per day, which can be customized to suit individual schedules and routines. It also has a temporary temperature override, which allows users to quickly adjust the temperature without having to reset their programmed settings. The thermostat is compatible with heating and cooling systems that use 24-volt power, including gas, oil, and electric systems, as well as heat pumps without auxiliary heat. It is not compatible with electric baseboard heat, radiant ceiling heat, or multi-stage heating and cooling systems. The thermostat has a sleek and modern design, and it can be mounted on a horizontal or vertical wall plate. Overall, the Honeywell RTH221B1039/U1 is a reliable and cost-effective option for homeowners who want to save energy and customize their home's temperature settings.
| Brand | Honeywell |
| Model | RTH221B1039/U1 |
| Product | thermostats |
| Language | English |
| Filetype | User manual (PDF), Installation Guide (PDF) |
Can't find the answer to your question in the manual? You may find the answer to your question in the FAQs about the Honeywell RTH221B1039/U1 below.
The best place for the thermostat is the room where you spend the most time, in many cases the living room or kitchen. Place the thermostat about one and a half metres above the floor, not in the sun and not on an outside wall.
If your thermostat has a dead band, your installation is, as it were, 'at rest'. The thermostat only switches on when, for example, the difference deviates more than 2˚C from the set room temperature.
Most people find that the ideal room temperature is between 19 and 22 degrees Celsius.
To set the temperature on the Honeywell RTH221B1039/U1 thermostat, follow these steps: 1. Temporary Temperature Adjustment: - Press the "s" or "t" button to immediately adjust the temperature. - The new temperature will be maintained until the next programmed time period begins. - To cancel the temporary setting, press the "RUN" button. 2. Permanent Temperature Adjustment: - Press the "HOLD" button to permanently adjust the temperature. - This will override the temperature settings for all time periods. - The thermostat will maintain the set temperature 24 hours a day until manually changed or the "RUN" button is pressed to cancel the hold and resume the program schedule. Note: Make sure the thermostat is set to the system you want to control (heat or cool). Please refer to the Honeywell RTH221B1039/U1 thermostat manual for more detailed instructions and information.
To select the system type on the Honeywell RTH221B1039/U1 thermostat, follow these steps: 1. Determine Your System Type: - Check if your system is a single-stage heat and cool system, heat-only system, or cool-only system. - If it is, you can proceed to the next step. If not, continue to the Advanced Installation section in the manual. 2. Enter System Setup: - Press and hold both the "s" and "t" buttons on the thermostat until the display changes (approximately 5 seconds). 3. Change System Type Setting: - Press the "s" or "t" button to change the setting. - Use the buttons to navigate through the available system types. - Select the appropriate system type for your HVAC system. 4. Save and Exit: - Press the "RUN" button to save the settings and exit the system setup. Note: The Honeywell RTH221B1039/U1 thermostat is compatible with 24-volt or 750 millivolt systems. It will not work with multi-stage conventional systems or systems operating at 120/240 volts. Please refer to the Honeywell RTH221B1039/U1 thermostat manual for more detailed instructions and information.
To use the fan on the Honeywell RTH221B1039/U1 thermostat, follow these steps: 1. Identify Your System Type: - Determine if you have a gas or oil heating system or an electric heat pump system. - This will determine the appropriate setting for the fan operation switch. 2. Set the Fan Operation Switch: - For gas or oil heating systems: Leave the fan operation switch in the factory-set position. This setting allows the thermostat to control the fan when there is a call for heat. - For electric heat pump systems: Change the fan operation switch to the appropriate setting. This allows the thermostat to control the fan when there is a call for heat, provided a fan wire is connected to the G terminal. 3. Adjust Fan Settings: - Use the FAN button on the thermostat to control the fan. - Press the FAN button to cycle through the available options, such as Auto (fan operates only when heating or cooling is active) or On (fan operates continuously). Note: Make sure the SYSTEM selector is set to the appropriate system (heating or cooling) before adjusting the fan settings. Please refer to the Honeywell RTH221B1039/U1 thermostat manual for more detailed instructions and information.
Yes, the Honeywell RTH221B1039/U1 thermostat is compatible with gas furnaces.
For assistance with the Honeywell RTH221B1039/U1 thermostat, you can visit the Honeywell Home website. They provide support and assistance for their products. You can find troubleshooting guides, frequently asked questions, and contact information for customer support. Additionally, you can explore the website for wiring assistance and other resources related to the thermostat. The Honeywell Home website is a reliable source for getting the assistance you need with your Honeywell RTH221B1039/U1 thermostat.
The Honeywell RTH221B1039/U1 thermostat is not compatible with heat pumps with backup heat.
The Honeywell RTH221B1039/U1 thermostat is compatible with various heating and cooling systems. Although I couldn't find specific information in the database, typically, this thermostat is compatible with gas, oil, or electric furnaces, central air conditioners, hot water systems, millivolt systems, and heat pumps without auxiliary/backup heat. It is important to note that the thermostat may not be compatible with heat pumps that have backup heat or multistage systems. To ensure compatibility with your specific system, it is recommended to consult the product manual or contact Honeywell customer support for further assistance.
The Honeywell RTH221B1039/U1 thermostat comes with a 1-year limited warranty. For more information about the warranty, you can visit the Honeywell Home website for support. Please note that warranty terms and conditions may vary depending on your location and the specific model of the thermostat. It is always recommended to refer to the official documentation or contact Honeywell customer support for the most accurate and up-to-date information regarding the warranty period and coverage for the Honeywell RTH221B1039/U1 thermostat.
Yes, the manual of the Honeywell RTH221B1039/U1 is available in English .
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Number of questions: 6The thermostat keeps clicking off and on and it’s not working properly. How do I turn off the scheduled timing for it and have it run for a period of time to heat up the house because it turns off right away
I want to set at a cooler temperature
back light on thermostat does not light up AAA batteries are new what do I do??
I want to make sure I'm on the correct setting to run my heat pump primarily Ok
Which direction do the batteries go in ?
Set cooler. It sends me porn instead. Not that I mind.