Honeywell CM921 manual Ii Reset the built-in program to the factory default

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fINE TuNING THE CM921

c.Now choose which one of the following parameters you would like to change: i) Change the time format

‘CLOCK SELECT’ should be displayed on the screen - press the or buttons to select the preferred time format (12=AM/PM format, 24=24hr format) and the display will lash, indicating a change has been made. To conirm this

change press the green button.

ii) Reset the built-in program to the factory default

Press the time button once. The display will show ‘RESET PROGRAM’.

Press the or buttons to select the preferred setting (0=user program, 1=factory program) and the display will lash, indicating a change has been

made. To conirm this change press the green button.

iii) Enable or disable summer/winter time change

Press the time button twice. The display will show ‘AUTO CHANGE’. Press

the or buttons to select the preferred setting (0=disabled/Off, 1=enabled/ On) and the display will lash, indicating a change has been made. To conirm

this change press the green button.

d.To exit the user mode move the slider switch to the AUTO, MAN or OFF position.

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Contents CM921 User Guide Plumbnation.co.uk Controls Layout Installing the Batteries To install the BatteriesSetting the Date and Time Running the Built-in Heating ProgramTo set the Date and Time Built-in Heating Program Reviewing the Heating ProgramModifying the Heating Program To press or buttons To disable time periods To enable time periodsDisabling / Enabling Time Periods Choosing the Operating Mode Adjusting the TimeDuring Normal Operation Using the Special Functions Temperature OverrideHoliday Function To set the Holiday functionChanging the User Parameters To change any of these user’s parametersIi Reset the built-in program to the factory default Iii Enable or disable summer/winter time changeTroubleshooting Guide Symptom Possible Cause RemedyCheck that there is power to the heating system How do I set one temperature for the whole day? What is Optimum Start?Wall bracket HC60NG Relay Box Controls LayoutCan I use my CM921 to control my air-conditioning system? An explanation for householders Following explanation applies to heating applications only42011077-103 R1

CM921 specifications

The Honeywell CM921 is a versatile and highly efficient programmable room thermostat designed to enhance comfort and energy management in residential and light commercial applications. This product exemplifies modern heating control technology, making it an excellent choice for users looking to optimize their heating systems while maintaining user-friendly operation.

One of the key features of the CM921 is its ability to program multiple heating schedules. Users can customize settings for different days of the week, allowing for unique heating profiles that can adapt to varying daily routines. This programming capability helps to reduce energy consumption by ensuring that heating is only active when needed, ultimately lowering energy bills.

The CM921 is equipped with an advanced, easy-to-read digital display that provides clear and concise information about the current room temperature and the set temperature. This intuitive interface simplifies user interaction, enabling quick adjustments when necessary. Additionally, the thermostat features a backlit screen, which facilitates usage even in low-light conditions.

Another notable technology integrated into the Honeywell CM921 is its compatibility with various heating systems. It supports both conventional and combi boiler types, making it a flexible solution for diverse heating requirements. The thermostat can also be connected to a 2-wire system, providing an easy installation process and reducing the need for complex wiring modifications.

Energy-saving features are a significant characteristic of the CM921. The thermostat includes an intelligent frost protection setting, which ensures that the temperature does not fall below a pre-defined level when the home is unoccupied for extended periods. This prevents pipes from freezing and potential damage to the system. Furthermore, the device offers a 'holiday mode', allowing users to save energy during extended absences by automatically adjusting the heating schedule.

In terms of characteristics, the Honeywell CM921 boasts a sleek and modern design, ensuring it fits seamlessly into any home décor. Its compact size makes it suitable for installation in various locations, providing flexibility for homeowners.

Overall, the Honeywell CM921 stands out for its blend of advanced technology, user-friendly features, and energy efficiency. It is an ideal solution for anyone seeking to improve their home’s heating management while enjoying comfort and convenience.
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