Controls Layout

1

2

3

15

CM9211..6

14

1312

456

7

8

DATE

AUTOMANOFFPROG

AUTO

MAN 9

OFF

10

11

Contents

 

GETTING STARTED WITH THE CM921

 

STEP 1: Installing the Batteries

3

STEP 2: Setting the Date and Time

4

STEP 3: Running the Built-In Heating Program

4

PROGRAMMING THE CM921

 

The Built-in Heating Program

5

Reviewing the Heating Program

5

Modifying the Heating Program

5

Disabling / Enabling Time Periods

7

OPERATING THE CM921

 

Choosing the Operating Mode

8

AUTO mode

8

MAN mode

8

OFF mode

8

Adjusting the Time

8

During Normal Operation

8

Temperature Enquiry

8

Temperature Override

9

Using the Special Functions

9

HOLIDAY Function

9

1

Day / Date Display

9

Slider Switch

2

Time Display

10

Green OK Button

3

LoT technology Display

11

Program Buttons

4

Heating On Indicator

12

Battery Compartment Lid

5

Battery Low Indicator

13

Battery Compartment

6

Temperature Display

14

Holiday Function Button

7

Temperature Change Buttons

15

Time Change Buttons

8Temperature Enquiry Button

FINE TUNING THE CM921

 

Changing the User Parameters

10

Change the Time Format

11

Reset the Built-in Program

11

Summer / Winter Time Change

11

FAQ’s & TROUBLESHOOTING

 

Trouble Shooting Guide

12

Frequently Asked Questions

14

WHAT IS A PROGRAMMABLE ROOM THERMOSTAT?

 

An explanation for householders

17

Manufactured for and on behalf of the Environment and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland by its Authorised Representative Honeywell International Inc.

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Honeywell CM921 manual Controls Layout

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.