Honeywell CM921 manual Setting the Date and Time, Running the Built-in Heating Program

Page 5

GETTING STARTED WITH THE CM921

STEP 2: Setting the Date and Time

To set the Date and Time:

a.Move the slider switch to the DATE position. ‘SET THE DAY’ will be displayed on the screen and the day digits will be lashing.

DATE

PROG

AUTO

MAN

OFF

b.Use the or buttons to set the correct day. When either of these buttons are pressed ‘DAY OK?’ will be displayed. Once the correct day is reached, press

the green button to conirm.

c.Now the month digits will start lashing and ‘SET THE MONTH’ will be displayed.

Change the month and then the year using the or buttons, pressing the

green button to save any changes made. (If an invalid date has been entered you will be returned to the start of the date setting mode).

d.After setting a valid date, the time digits will begin lashing and ‘SET THE TIME’ will be displayed.

e.Use the or buttons to set the correct time. Each press of the button will change the time by one minute and holding the button down will change the time

slowly at irst and get progressively quicker. Once the correct time is set, press

the green button to conirm then ‘CHANGES SAVED’ will be displayed for a moment followed by ‘DATE COMPLETE’.

Note: If the slider switch is moved at any time before ‘DATE COMPLETE’ is displayed the changes to the date and time will NOT be saved.

STEP 3: Running the Built-in Heating Program

The thermostat is now ready for operation. Move the slider switch to the AUTO position and the built-in heating program will start running. The built-in heating program has been designed to provide normal comfort requirements, but if you want to customise the default settings (as shown on the next page) please see the next section ‘PROGRAMMING THE CM921’.



Page 4 Page 6
Image 5
Page 4 Page 6
Contents CM921 User Guide Plumbnation.co.uk Controls Layout To install the Batteries Installing the BatteriesTo set the Date and Time Setting the Date and TimeRunning the Built-in Heating Program Modifying the Heating Program Built-in Heating ProgramReviewing the Heating Program To press or buttons Disabling / Enabling Time Periods To disable time periodsTo enable time periods During Normal Operation Choosing the Operating ModeAdjusting the Time Temperature Override Using the Special FunctionsHoliday Function To set the Holiday functionTo change any of these user’s parameters Changing the User ParametersIii Enable or disable summer/winter time change Ii Reset the built-in program to the factory defaultSymptom Possible Cause Remedy Troubleshooting GuideCheck that there is power to the heating system What is Optimum Start? How do I set one temperature for the whole day?HC60NG Relay Box Controls Layout Wall bracketCan I use my CM921 to control my air-conditioning system? Following explanation applies to heating applications only An explanation for householders42011077-103 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.
Top Page Image Contents