Honeywell CM921 Wireless Programmable Room Thermostat User Guide

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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/WinterTime 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).  

Honeywell Control Systems Ltd.  

Arlington Business Park,  

Bracknell  

CM921 - User Guide  

1 day Wireless Programmable Room Thermostat  

with LoT technology  

Berkshire  

RG12 1EB  

Technical Help Desk: 08457 678999  

www.honeywelluk.com  

42011077-103 R1  

© 2006 Honeywell International Inc.  

firealarmresources.com  

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General	Details
Name	Honeywell CM921 Wireless Programmable Room Thermostat User Guide
Make	Honeywell
Language	English
Filetype	PDF (Download)
File size	0.31 MB

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• ALL THERMOSTAT INSTRUCTIONS & USER MANUALS
• Honeywell

Honeywell CM921 Wireless Programmable Room Thermostat User Guide Overview

Summary of Contents

• Page 1: Description The Honeywell CM921 is a wireless programmable room thermostat designed to control your heating system efficiently, providing comfortable temperatures when you are at home and energy savings when you are away. 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. LoT technology provides informative ‘on-screen’ feedback and operational assistance to the user. Extra large LCD screen with backlight provides added user friendliness and clearer viewing. 6 independent temperature levels per day lets you set any 6 temperatures you require. Holiday button saves energy by letting you reduce the temperature for 1 to 99 days while you are away. 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. Optimum start option ensures that the optimum temperature conditions are achieved at the required times.
• Page 2: the nation’s favourite for plumbing and heating supplies free shipping on all orders over £100 to mainland UK secure payments finance available price match huge reductions on thousands of items boilers bathroom suites kitchen sinks & taps showers
• Page 3: Controls layout Getting started with the CM921 Step 1: Installing the batteries Step 2: Setting the date and time Step 3: Running the built-in heating program Programming the CM921 The built-in heating program Modifying the heating program Disabling / enabling time periods Operating the CM921 Choosing the operating mode
• Page 4: Getting started with the CM921 This section shows you how to setup and run the thermostat in 3 simple steps. Step 1: Installing the Batteries Please follow the instructions in this section only if the thermostat screen is blank. If the screen displays some information, move on to Step 2: Setting the Date and Time. To install the batteries: Lift up the front cover of the thermostat to reveal the battery cover and product controls. Remove the battery cover by pressing down and sliding out. Insert the 2 x AA LR6 Alkaline batteries supplied with the thermostat, ensuring the correct orientation. After a short pause, the thermostat will display information on the screen and is now ready for use. Replace the battery cover by sliding it firmly back into the front of the thermostat. Please respect your environment. Take care to dispose of used batteries carefully.
• Page 5: Getting started with the CM921 Setting the date and time involves moving the slider switch to the DATE position. The screen will display ‘SET THE DAY’ with the day digits flashing. Use the buttons to set the correct day and confirm by pressing the green button. After setting the day, the month digits will start flashing with ‘SET THE MONTH’ displayed. Change the month and year, confirming changes with the green button. Once a valid date is set, the time digits will begin flashing with ‘SET THE TIME’ displayed. Use the buttons to set the correct time, confirming with the green button. If the slider switch is moved before ‘DATE COMPLETE’ is displayed, changes will not be saved. The thermostat is ready for operation once the slider switch is moved to the AUTO position. The built-in heating program is designed for normal comfort requirements, with customization options available.
• Page 6: Programming the CM921 The built-in heating program has 6 temperature level changes that can be set between 3.00am and 2.50am. Each temperature level can be set between 5°C and 35°C, and adjusted in 0.5°C increments. The factory default program for heating includes specific times and temperatures for each period. To review or edit the heating program, move the slider switch to the PROG position and use the buttons to navigate between the 6 individual programming periods. To change the heating program, set the slider switch to the PROG position, entering programming mode. The active period is highlighted by a flashing square symbol around the numbers at the bottom of the screen.
• Page 7: Programming the CM921 To adjust the period start time, press the or buttons and ‘TIME 1 OK?’ will be displayed. Holding the button down will change the time quickly. Press the green button to confirm the setting. ‘CHANGES SAVED’ is displayed for 1.5 seconds then ‘SET TEMP 1’ will be shown. The temperature setting for the period will now be flashing. To adjust this, press the or buttons and ‘TEMP 1 OK?’ will be displayed. Press the green button to confirm the setting. ‘CHANGES SAVED’ will be displayed for a moment followed by ‘SET TIME 2’. Adjust the next time and temperature period by repeating steps until all 6 periods are set or move the slider switch to the AUTO position. To exit the programming mode, move the slider switch to the desired operating mode - AUTO, MAN, or OFF. To run the adjusted program, select the AUTO mode. If the unit is left in programming mode for more than 10 minutes without any buttons pressed, ‘MOVE THE SLIDER’ will be displayed.
• Page 8: Disabling / enabling time periods The thermostat has 6 periods that can be programmed, but you may not need all of these switch points for your heating requirements. To disable time periods: Go to the desired period by moving the slider switch to the PROG position, then using the buttons to navigate. Press and hold the button for at least 2 seconds and the display will indicate the period has been removed from the program. To enable time periods: Navigate to the disabled period by moving the slider switch to the PROG position. Once selected ‘DISABLED’ will be displayed. Press and hold the button for at least 2 seconds and ‘ENABLED’ will be displayed for a moment before returning to normal programming mode.
• Page 9: Choosing the operating mode allows the thermostat to operate in three different modes: Automatic, Manual, or Off. Automatic mode sets the thermostat to follow the temperature program, maintaining comfort while maximizing energy savings. Manual mode allows the thermostat to maintain a fixed setpoint throughout the day, adjustable from 5°C to 35°C. Off mode controls to a minimum temperature setting of 5°C for frost protection, adjustable by contacting your installer. To adjust the time during normal operation, use the buttons to set the time and confirm changes. In AUTO and MAN modes, the thermostat displays the current room temperature as 'ROOM TEMP'. Pressing the button reveals the programmed 'target' temperature, displayed as 'TARGET TEMP' for 5 seconds. In OFF mode, the current room temperature is shown, and pressing the button displays 'FROST TEMP' for the protective set value. To modify the frost protection value, please contact your installer.
• Page 10: Operating the CM921 Temperature Override During normal operation (AUTO mode) the programmed temperature can be adjusted manually by pressing the or buttons. The ‘target’ temperature will be displayed and flash for 5 seconds. Using the Special Functions Holiday Function The holiday function allows you to set a constant temperature (default = 10°C) for a specified number of days (from 1 - 99 days). This lets you save energy and related costs when you are away from home. To set the Holiday function: Move the slider switch to the AUTO or MAN position. Press the button to display the holiday days counter and temperature setting. The day after the current day will be selected and ‘RETURN DATE OK?’ will be displayed. Press the or time buttons to set the holiday time (1 – 99 days). Press the green button to confirm the setting. ‘CHANGES SAVED’ will be displayed for a moment followed by ‘TEMP OK?’. Press the or buttons to set the holiday temperature (5°C - 35°C). Press the green button to confirm the setting. ‘HOLIDAY MODE’ will now be displayed on the screen until the return date is reached or the holiday mode is cancelled.
• Page 11: Fine tuning the CM921 Changing the user parameters The user mode allows you to modify some basic settings of the thermostat to meet your personal preferences. You can change the time display format (24hr or AM/PM), reset the heating program to the built-in settings, and disable or enable the summer/winter time change feature. To change any of these user’s parameters, move the slider switch to the OFF position, then press and hold the button for approximately 5 seconds. Once entered, the following information will be shown on the screen.
• Page 12: Fine tuning the CM921 Choose which parameter to change: Change the time format. 'Clock select' should be displayed on the screen. Press the buttons to select the preferred time format (12=AM/PM format, 24=24hr format). To confirm this change press the green button. Reset the built-in program to the factory default. Press the time button once. The display will show 'Reset program'. Enable or disable summer/winter time change. Press the time button twice. The display will show 'Auto change'. To exit the user mode move the slider switch to the AUTO, MAN or OFF position.
• Page 13: Troubleshooting guide The thermostat has a blank LCD screen. Check to see if there are batteries in the battery compartment and the paper tab has been removed. Check that the batteries have been installed in the correct orientation. Replace with new batteries. The thermostat shows a flashing symbol on the LCD screen. Batteries are exhausted and need replacing. The thermostat’s LCD display shows a symbol but the heating does not switch on. The heat demand is sent to the HC60NG as a value between 0-100%. To check if RF system is communicating properly, press the button to increase the set temperature a few degrees above the current temperature. If the symbol does not clear itself in a few minutes, call the installer.
• Page 14: Symptom: The thermostat’s LCD display works but the heating does not switch on. Possible Cause: No power to heating system. Remedy: Check that there is power to the heating system. Possible Cause: Program does not call for heat. Remedy: Move the slider switch to MAN and increase the temperature a few degrees above the current room temperature. Possible Cause: Wrong electrical connection. Remedy: Call electrical installer to check the boiler and HC60NG power supply. The red LED on the HC60NG is constantly on or flashing. Possible Cause: RF communication lost due to the wrong location of the thermostat. Remedy: Hook the thermostat back on the wall bracket or replace it in a position with reliable RF communication. Possible Cause: RF communication fault. Remedy: Call installer. Note: You can control the boiler manually when the RF communication is lost. Heating switches ON or OFF too slowly or quickly. Possible Cause: The thermostat not set correctly for your system. Remedy: Call installer. Temperature swings between too hot and too cold. Possible Cause: The thermostat not set correctly for your system.
• Page 15: How do I change the batteries on the CM921 when they run out? The thermostat constantly monitors the battery power level, which typically lasts for about 2 years before needing replaced. When the power is running low, a flashing symbol will be displayed on the screen. How do I set one temperature for the whole day? To operate as a simple thermostat with one temperature for a period of time, move the slider switch to the MAN position. Adjust the manual temperature by pressing the or buttons. What is Optimum Start? Optimum Start is a program which ensures that the optimum temperature conditions are achieved at the required times. This is an energy efficiency feature that adjusts the start time of your heating system depending upon how cold it is. I want to use the table stand instead of wall mounted bracket. Where can I position the room unit? It is important to keep the room unit in a location where reliable RF communication was proven. Advise your installer where you would like to position the room unit. The Room Unit measures the temperature of the room where it is located. It is important that the placement of the Room Unit within the room is away from draughts, direct sunlight, and other heat sources.
• Page 16: FAQ’s & troubleshooting How do I remove the thermostat from the table stand or wall bracket? After programming is finished always replace the thermostat back on the wall holder or table stand. What does it mean when the HC60NG relay box green LED is ON? Green LED indicates normal operation of the radio frequency system. When the green LED is ON the boiler is also ON. When the LED is OFF the boiler is OFF.
• Page 17: FAQ’s & troubleshooting You can use your CM921 to control your air-conditioning system if it has been set up correctly. To switch the thermostat between heating and cooling modes, press the buttons together for 5 seconds. The text ‘COOLING’ will be displayed to indicate the cooling operation is now active. The factory default program for cooling can be modified like the default heating program. If something happens to my heating system, refer to the troubleshooting guide on page 15. If you still need assistance, call your installer. The thermostat should only be opened or removed by a qualified professional to prevent possible injury.
• Page 18: What is a programmable room thermostat? A programmable room thermostat is both a programmer and a room thermostat. A programmer allows you to set ‘On’ and ‘Off’ time periods to suit your own lifestyle. A room thermostat works by sensing the air temperature, switching on the heating when the air temperature falls below the thermostat setting. A programmable room thermostat lets you choose what times you want the heating to be on and what temperature it should reach. Turning a programmable room thermostat to a higher setting will not make the room heat up any faster. The way to set and use your programmable room thermostat is to find the lowest temperature settings that you are comfortable with. If your heating system is a boiler with radiators, there will usually be only one programmable room thermostat to control the whole house. You can have different temperatures in individual rooms by installing thermostatic radiator valves (TRVs) on individual radiators. Any adjustments above comfortable settings will waste energy and cost you more money.
• Page 19: What is a programmable room thermostat? The time on the programmer must be correct. Some types have to be adjusted in spring and autumn at the changes between Greenwich Mean Time and British Summer Time. You may be able to temporarily adjust the heating programme, for example, ‘Override’, ‘Advance’ or ‘Boost’. These are explained in the manufacturer’s instructions. Programmable room thermostats need a free flow of air to sense the temperature. They must not be covered by curtains or blocked by furniture. Nearby electric fires, televisions, wall or table lamps may prevent the thermostat from working properly.