Honeywell manual CM921 User Guide

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Honeywell Control Systems Ltd.

 

Arlington Business Park,

 

Bracknell

 

Berkshire

 

RG12 1EB

 

Technical Help Desk: 08457 678999

42011077-103 R1

www.honeywelluk.com

© 2006 Honeywell International Inc.

CM921 - User Guide

1 day Wireless Programmable Room Thermostat with LoT technology

Description

The Honeywell CM921 is a ‘wireless’ programmable room thermostat designed to control you heating system efficiently, providing comfortable temperatures when you are at home and energy savings when you are away. With ‘wireless’ communication there is no need to provide a wired connection between the thermostat and boiler.

The following instructions explain how to set up, program and operate your Honeywell CM921 Programmable Room Thermostat.

Features

Wireless connection to the boiler allows you to mount the Chronotherm in your room without decor disruption

Armchair programming feature lets you program your Chronotherm while resting comfortably in your armchair

Ergonomic User Interface features an ‘OK-button’ making the CM921 very easy to use so you always stay in control.

LoT technology provides informative ‘on-screen’ feedback and operational assistance to the user.

Extra Large LCD (Liquid Crystal Display) Screen with Backlight provides added user friendliness and clearer viewing – even in the dark.

6 independent temperature levels per day lets you set any 6 temperatures you require (from 5 to 35°C) so you can enjoy economical comfort every day

Holiday button saves energy by letting you reduce the temperature for 1 to 99 days while you are away from home, resuming normal operation on your return.

Automatic Summer/Winter Time Change will adjust the clock automatically for ‘Daylight Saving Time’.

Built-in Memory holds the user program indefinitely so that it is never lost – even if you remove the batteries.

Optimum Start option is an advanced feature which ensures that the optimum temperature conditions are achieved at the required times (option set by your installer).

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Contents CM921 User Guide Plumbnation.co.uk Controls Layout To install the Batteries Installing the BatteriesRunning the Built-in Heating Program Setting the Date and TimeTo set the Date and Time Reviewing the Heating Program Built-in Heating ProgramModifying the Heating Program To press or buttons To enable time periods To disable time periodsDisabling / Enabling Time Periods Adjusting the Time Choosing the Operating ModeDuring Normal Operation 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.
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