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Honeywell CM921 Manual

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Honeywell CM921About Honeywell CM921
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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.


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 35C) 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.
Honeywell Control Systems Ltd. Arlington Business Park, Bracknell Berkshire RG12 1EB Technical Help Desk: 42011077-103 RHoneywell International Inc.

CM921 - User Guide

1 day Wireless Programmable Room Thermostat with LoT technology
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).

Controls Layout

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 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 FAQs & 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 Srl, Ecublens, Route du Bois 37, Switzerland by its Authorised Representative Honeywell International Inc.
Day / Date Display Time Display LoT technology Display Heating On Indicator Battery Low Indicator Temperature Display Temperature Change Buttons Temperature Enquiry Button
Slider Switch Green OK Button Program Buttons Battery Compartment Lid Battery Compartment Holiday Function Button Time Change Buttons
This section shows you how to setup and run the thermostat in 3 simple steps:
STEP 1: Installing the Batteries
Note: Please follow the instructions in this section only if the thermostat screen is blank (no symbols or digits are displayed). If the screen displays some information move on to STEP 2: Setting the Date and Time. To install the Batteries: a. Lift up the front cover of the thermostat to reveal the battery cover and product controls. b. Remove the battery cover by pressing down and sliding out. c. Insert the 2 x AA LR6 Alkaline Batteries supplied with the thermostat, ensuring the correct orientation (see Controls Layout on page 2). d. After a short pause the thermostat will display information on the screen and is now ready for use. e. 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.
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 flashing.
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 confirm. c. Now the month digits will start flashing 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 flashing 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 first and get progressively quicker. Once the correct time is set, press the green button to confirm 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.

programming THE CM921

The Built-in Heating Program
The built-in heating program has 6 temperature level changes that can be set between 3.00am and 2.50am - allowing you to maintain the evening temperature after midnight. Each temperature level can be set between 5C and 35C, and adjusted in 0.5C increments. The factory default program for heating is as follows: Period Time Temperature 1 6:30 21C 2 8:00 18C 3 12:00 21C 4 14:00 18C 5 18:00 21C 6 22:30 16C
Reviewing the Heating Program
To review or edit the heating program move the slider switch to the PROG position then use the or buttons to navigate between the 6 individual programming periods.
Modifying the Heating Program
To change the heating program: a. Set the slider switch to the PROG position, entering programming mode. SET TIME 1 will be displayed and the time settings for period 1 will be flashing. The active period is highlighted by a flashing square symbol around the numbers at the bottom of the screen.
b. 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. Note: If you are pressing the or buttons and the display flashes the next change period, it means the next change will be pushed forward if you continue to press or buttons).
c. Press the green button to confirm the setting. CHANGES SAVED is displayed for 1.5 seconds then SET TEMP 1 will be shown. Note: If the original time setting did not require adjustment press the green button to move on to step d.
d. The temperature setting for period 1 will now be flashing. To adjust this press the or buttons and TEMP 1 OK? will be displayed. e. Press the green button to confirm the setting. CHANGES SAVED will be displayed for a moment followed by SET TIME 2. f. The next time and temperature period will now be active. Adjust this by repeating steps b - e above until all 6 periods are set or move the slider switch to the AUTO position to run the program as set, at any time. g. After setting period 6 CHANGES SAVED will be displayed as before. i. To exit the programming mode move the slider switch to the desired operating mode - AUTO, MAN or OFF. Note: To run the adjusted program select the AUTO mode. Note: If the unit is left in programming mode for more than 10 minutes without the slider being moved or any buttons pressed, MOVE THE SLIDER will be displayed. Press a button to finish programming the thermostat or move the slider to select the desired operating mode.

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. Therefore, any period from 2 to 6 can be disabled or enabled as follows: To disable time periods: Go to the desired period ( 2 to 6 ) by moving the slider switch to the PROG position, then using the and buttons to navigate, ensuring the correct period is highlighted with the flashing square symbol. 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, then using the and buttons. 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.

operating THE CM921

Choosing the Operating Mode
The thermostat can operate in three different modes: Automatic, Manual or Off. To set the operating mode move the slider switch to the desired position. The screen indicates which mode is currently active by displaying AUTO, MAN or OFF. AUTO (automatic) mode Automatic mode sets the thermostat to follow the temperature program (default or personalised). Operating the thermostat in this mode is the best way to maintain a high level of temperature comfort whilst maximising your energy savings. Manual mode sets the thermostat to act as a simple thermostat with a fixed setpoint throughout the day. The setpoint can be adjusted from 5C to 35C by using the or buttons. The thermostat will continue to maintain this temperature until another operating mode or temperature is selected. Off mode sets the thermostat to control to a minimum temperature setting of 5C (default) that acts as a frost protection measure for your home. This value can be adjusted by calling your installer.

MAN (manual) mode

OFF mode

Adjusting the Time

To adjust only the time during normal operation use the or buttons to adjust the time and press the green button again to confirm any changes.

During Normal Operation

Temperature Enquiry In AUTO and MAN operating modes the thermostat will display the current room temperature, which is indicated by the text ROOM TEMP displayed on the screen. To review the programmed target temperature (the temperature which the thermostat is trying to maintain) press the button. This target temperature value will be displayed flashing and the text TARGET TEMP will be shown for 5 seconds before returning to the current room temperature value. In OFF operating mode the thermostat again displays the current room temperature, as above, but when the button is pressed the text FROST TEMP is displayed indicating the set value to protect your home. To modify this value please contact your installer.

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 during this time the or buttons can be used to modify the set value. Note: This temperature override is cancelled at the next programmed temperature change.
Using the Special Functions
HOLIDAY Function The holiday function allows you to set a constant temperature (default = 10C) for a specified number of days (from 1 - 99 days). This lets you save energy and related costs when you are away from home, but resumes normal operation on the day of your return. To set the Holiday function: a. Move the slider switch to the AUTO or MAN position. b. Press the button to display the holiday days counter and temperature setting, along with the holiday indicator. c. 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 (days). Note: (The day and date will update according to the number of days selected). button to confirm the setting.

d. Press the green

e. CHANGES SAVED will be displayed for a moment followed by TEMP OK?. Press the or buttons to set the holiday temperature (5C - 35C) f. 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.
The thermostat will now control to the new temperature for the set number of days that your home is vacant. At midnight the holiday counter will be reduced by one until the selected number of days have passed. The thermostat will then return to normal operation as set by the slider switch position (AUTO or MAN position). To cancel the HOLIDAY setting or to exit the function at any time press the button a second time or move the slider switch to a different position.

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 users parameters: a. Move the slider switch to the OFF position, then press and hold the approximately 5 seconds. button for approximately 5 seconds. button for
b. Once entered the following information will be shown on the screen:
c. Now choose which one of the following parameters you would like to change: i) Change the time format or CLOCK SELECT should be displayed on the screen - press the buttons to select the preferred time format (12=AM/PM format, 24=24hr format) and the display will flash, indicating a change has been made. To confirm this change press the green button. ii) Reset the built-in program to the factory default time button once. The display will show RESET PROGRAM. Press the Press the or buttons to select the preferred setting (0=user program, 1=factory program) and the display will flash, indicating a change has been made. To confirm this change press the green button. iii) Enable or disable summer/winter time change time button twice. The display will show AUTO CHANGE. Press Press the the or buttons to select the preferred setting (0=disabled/Off, 1=enabled/ On) and the display will flash, indicating a change has been made. To confirm this change press the green button.

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

Possible Cause

Batteries not installed. 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 correctorientation. Replace with new batteries. Replace with new batteries.

Troubleshooting Guide



The thermostat has a blank LCD screen. Incorrect battery orientation.
faqs & troubleshooting
Exhausted batteries. Batteries are exhausted and need replacing.
The thermostat shows a flashing symbol on the LCD screen.
The thermostats LCD display shows a symbol but the heating does not switch on.
The heating is not required at this moment.
The heat demand is send to the HC60NG as a value between 0-100%. The HC60NG will adjust the boiler on time to meet this requirement. That is why the heating will be off sometimes even if the symbol is displayed. To check if RF system is communicating properly press the button to increase the set temperature a few degrees above the current temperature. The heating should come on after a few seconds. Remove and re-insert the batteries in the thermostat. If the symbol does not clear itself in a few minutes call the installer.

Fault in thermostat

No power to heating system. Program does not call for heat. Move the slider switch to MAN and press or to increase the temperature a few degrees above the current room temperature. The heating should come on after a few seconds. Call electrical installer to check the boiler and HC60NG power supply as well as the connection between the boiler and the HC60NG. Hook the thermostat back on the wall bracket or replace the thermostat on the table stand in the position where RF communication was reliable. Call installer. NOTE: You can control the boiler manually when the RF communication is lost: Press the HC60NG push button to switch the boiler on and off. When the green LED is on the boiler is on. The thermostat not set correctly for your system. The thermostat not set correctly for your system. Call Installer. Check that there is power to the heating system.
The thermostats LCD display works but the heating does not switch on (HC60NG LEDs are off or green one is on).
Wrong electrical connection.
The red LED on the HC60NG is constantly on or flashing.
RF communication lost due to the wrong location of the thermostat. RF communication fault.

Heating switches ON or OFF too slowly or quickly.
Temperature swings between too hot and too cold.

Call Installer.

How do I change the batteries on the CM921 when they run out? The thermostat constantly monitors the battery power level, which typically last for about 2 years before needing replaced. When the power is running low a flashing symbol will be displayed on the screen. To change the batteries follow the steps in the above section (STEP 1: Installing the Batteries on page 3), replacing the used batteries with new ones in step c. Note: While changing the batteries your program settings will be stored but you may need to adjust the time and date settings to be correct. 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. This can be set anywhere from 5C to 35C in 0.5C steps. The thermostat will continue to maintain this temperature until another operating mode is selected or the temperature is adjusted. 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. For example, on cold days your heating system will be started earlier to ensure that your home is warm when you get up (at the target temperature) and on warmer days the heating system will be started later to save energy. So, if the Optimum Start Feature is used, then the time / temperature settings which are entered into the thermostat should be set to when you want to be warm by and not when you want the heating system to start. 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 would you like to position the room unit and he will check if the RF communication is reliable in the selected location(s). Important: 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. As this is a wireless device certain objects could interfere with the RF signal - Leave at least 30cm distance from any metal objects (including wall boxes) and at least 1 metre from any other electrical equipment eg. radio, TV, PC, etc.

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. Wall bracket Table stand
HC60NG Relay Box Controls Layout
Push button and relay status LEDs
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.
Can I use my CM921 to control my air-conditioning system? Yes, if your system has been set up correctly you can use your thermostat to control the cooling. To switch the thermostat between heating and cooling modes press the or buttons together for 5 seconds in any of the product operating modes (AUTO, MAN or OFF). The text COOLING will be displayed for a moment on the screen to indicate the cooling operation is now active. The factory default program for cooling is specified in the table below, but this can be modified in the same way as the default heating program: Period Time Temperature 1 6:30 24C 23456 8:00 28C 12:00 24C 14:00 28C 18:00 24C 22:30 24C
If something happens to my heating system how can I check that the thermostat is working? Refer to the Troubleshooting Guide on page 15. If you still need assistance after this call your installer. The thermostat should only be opened or removed by a qualified professional to prevent possible injury from electric shock and/or damage to the product.
.an explanation for householders
(The following explanation applies to heating applications only) 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, and switching it off once this set temperature has been reached. So, a programmable room thermostat lets you choose what times you want the heating to be on, and what temperature it should reach while it is on. It will allow you to select different temperatures in your home at different times of the day (and days of the week) to meet your particular needs. Turning a programmable room thermostat to a higher setting will not make the room heat up any faster. How quickly the room heats up depends on the design of the heating system, for example, the size of boiler and radiators. Neither does the setting affect how quickly the room cools down. Turning a programmable room thermostat to a lower setting will result in the room being controlled at a lower temperature, and saves energy. The way to set and use your programmable room thermostat is to find the lowest temperature settings that you are comfortable with at the different times you have chosen, and then leave it alone to do its job. The best way to do this is to set low temperatures first, say 18C, and then turn them up by one degree each day until you are comfortable with the temperatures. You wont have to adjust the thermostat further. Any adjustments above these settings will waste energy and cost you more money. If your heating system is a boiler with radiators, there will usually be only one programmable room thermostat to control the whole house. But you can have different temperatures in individual rooms by installing thermostatic radiator valves (TRVs) on individual radiators. If you dont have TRVs, you should choose a temperature that is reasonable for the whole house. If you do have TRVs, you can choose a slightly higher setting to make sure that even the coldest room is comfortable, then prevent any overheating in other rooms by adjusting the TRVs.

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 manufacturers instructions. Programmable room thermostats need a free flow of air to sense the temperature, so 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.

42011077-103 R1


The CM921 thermostat is designed to provide automatic time and temperature control of heating or cooling systems in villas and apartments. It can be used as part of a system in conjunction with combiboilers, oil-burners and gas fired boilers, circulation pumps, thermal actuators, zone values and electric heating systems (<10A). In combination with other CM921 room units and HC60NG receivers it can be used to control multi-zone applications (up to 4 zones). The radio frequency controlled CM921 system pack consists of a room unit CMT921A and a relay box R6660D (HC60NG). No wiring to the room unit is required. The installer only needs to wire the relay box to the controlled device (e.g. boiler) and mount the room unit in a suitable location where RF communication is reliable. The CM921 uses reliable RF communication technology in the 868MHz band. The CM921 extra large LCD display, dynamic text display and controls layout are identical to the CM901 wired thermostat. The unit is ideal for consumers who want reliable and precise temperature control from a modern looking, simple to program and easy-to-use product.


CM921 can be installed without disrupting your room dcor as no wiring connection is required between the room unit and the boiler Attractive, slim, ultra-modern styling makes it ideal for location in any type of home 1-day heating programming A dynamic text display on the LCD that gives enhanced feedback to the user / installer LCD Backlighting to illuminate the display for easier viewing in low light conditions Reliable RF communication utilising 868 MHz band with 1 % duty cycle limit to minimise communication disturbance Every room unit can be bound with several relay boxes (e.g. to control several electric heating panels) Armchair programmed Holiday button that provides energy savings by reducing to a constant temperature for 1 to 99 days when people are on holiday, returning to normal operation (AUTO or MANUAL) on the day of their return. EEPROM memory holds the user program indefinitely OFF position has an integral frost protection setting at minimum 5C (installer adjustable) so that pipes in the house will never freeze in winter. Communication compatibility with other Honeywell product such as HR80, HM80 and HCE80.
CM921 can be used to control a zoning system with up to 4 zones Maximum system efficiency and extended boiler life due to unique zoning system synchronisation Automatic Summer / Winter time change adjusts the time automatically to daylight saving time. Standard room units and receiver boxes are used for zoning applications algorithm When used with the table top stand the room unit can be positioned anywhere in the room where RF communication is reliable 24.230V 10A resistive, 3A inductive SPDT relay provides compatibility with most domestic central heating systems reducing the need to stock many different models. The HC60NG may be surface or wallbox mounted. Installer Set-Up Mode allows extra functions to be set at the discretion of the installer to match the consumer applications and needs:
Optimisation Pump Exercise Upper / Lower Setpoint Limit Adjust Temperature offset Minimum ON time Cycle rate Heat / Cool Operation Proportional Band Width Fail-safe mode for communication loss 1 EN0H 8557 UK07 R0 09/06


Room Unit Layout: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. Day & Date Display Time Display Dynamic Text Display (DTD) Burner On Indicator Battery Low Indicator Temperature Display Temperature Change Buttons Information Enquiry Button Slider Switch Green OK Button Program Buttons Battery Cover Battery Compartment Holiday Button Time Change Buttons


Room unit power supply Battery life Battery replacement Receiver power supply Switch type Output rating Wiring (receiver only) Wire access : 2 x 1.5 V IEC LR6 (AA) Alkaline cells : Minimum 2 years : Program retained in EEPROM : 230V AC +10% - 15%, 50Hz : SPDT potential free : 24-230 V AC, 10 A resistive, 3 A inductive 0.6 p.f. : Cable terminals for mains and relay wiring 2 for max 2.5 mm wire : from the rear (wall box mounting), right and bottom : ISM (868.0-868.6) MHz, 1% duty cycle : 30 m in a residential building environment


Sensing element : 100K (@ 25 C ) NTC thermistor Control form : Fuzzy Logic Algorithm Minimum ON 10% of cycle time (min one minute), time adjustable to 2 to 5 min (see installer set up) Cycle rate : Selectable by application (see installer set up) + o : 0.5 K (nominal) @ 20 C, 50% load 3K Temperature /hour control accuracy Fail-safe mode : Off or cycling depending on the CM927 system set-up


Time display Time keeping accuracy Program Time setting resolution Temperature setting range : 24 hour or 12 hour AM/PM format : Typically better than 10 minutes per year : 1-day with 6 daily time and temperature level changes : Time of day - 1 minute Program 10 minute steps o o : Program : 5 to 35 C in 0.5 C steps Frost o : 5 C or equal to lower limit (5 o o C to 16 C). Frost protection does not work in cooling mode o o : From 0 C to 50 C
RF operation band RF communication range RF communication technology Blocking immunity
: short, high rate transmissions to minimise air time and avoid collisions : Receiver class 2 (ETSI EN300 220-1 version 1.3.1) RF binding method : Factory pre-bound with the room unit.
: 0 to 40 C when relay load < 8 A o : 0 to 30 C when relay load > 8 A o Shipping & storage : -20 to 55 C temperature Humidity : Humidity range 10 to 90% rh, noncondensing IP class : 30 Meeting the : EN60730-1(Nov 2000), EN55014-1(1997), following EN55014-2(2000), ETSI EN300 220-3 standards (2000), ETSI EN301 489-3(2000) Operating temperature
Room Temperature display range
2 EN0H 8557 UK07 R0 09/06


To enter the installer set-up mode: a) Move the slider switch to the OFF position. b) Press and hold the INFO i button and the two program buttons < > together. c) The unit will display the first parameter of installer parameter group category 1 (from n.1 to n.19). or buttons to change the factory d) Press the TEMP setting. The display will flash indicating that a change has been made. e) Press the green OK button to confirm this change and the display will stop flashing. f) Press the + button to go to the next parameter. g) Press the program button > to go to category 2 in the Installer mode (from n.1 to n.14). h) To exit the installer mode, move the slider switch to the AUTO or MAN positions.
Factory Setting or New Choice Press TEMP Abbreviated Set-Up Description e.g. Cl = Clock Format or to change e.g. 12 = AM/PM Format 24 = 24hr Format

Installer Set-up Number (Press + or - to change) e.g. 1 = Clock Format
In Installer set-up we can:
Set-up specific applications parameters Enable special features Configure system timing master for the zoning system
Brief Description of the Parameter Function.

Specific Applications

Cycle/ Hour Minimum ON time

(in minutes)

What do you need to change?
Note : All parameters listed below belong to category 2 System Parameters (see Installer Parameters Table) No changes required 1. Set Minimum ON Time to 4 minutes. 2. Set Cycle/Hour to 3. Set Cycle/Hour to 12. No changes required. 1. Configure the thermostat to allow switching between heating and cooling modes (set parameter n.4:HC to 1) 2. Set the thermostat accordingly to the required mode of or operation (heating or cooling) by pressing the TEMP buttons together for 5 seconds. Modify the cooling program as required.


Gas Boilers (<30KW) Oil Boiler Thermal Actuator Zone valve

Air conditioning

Heat Pump/ Air conditioner Fan coil
1. Set Minimum ON Time to 4 minutes. 2. Set Cycle/Hour to 3. No changes required.
3 EN0H 8557 UK07 R0 09/06

Special Features

Optimisation (Variable Start Time) Heating or Cooling Operation


The thermostat will adjust the start time in the morning/afternoon so the desired temperature is reached by the start of the program period. The system will restrict the start time to a max of 2 hours. This product can be used for heating or cooling applications. If you select cooling mode the control algorithm and factory default program will be modified. You can independently modify the heating and cooling profile. This feature moves time automatically on the last Sunday of March and the last Sunday of October. The feature is factory enabled. If the thermostat is located in a particularly hot/cold location for reliable signal transmission reasons then the measured/displayed temperature can be adjusted by +/- 3C. This is useful if the homeowner wants the reading to match another appliance temperature display. The normal upper temperature limit of 35C can be reduced to 21C to save the homeowner energy. The normal lower limit of 5C can be increased up to 21C to protect inhabitants from cold.

To enable: Set parameter 8:OP (category 1) to 1. To enable: Set parameter 4:HC (category 2) to 1.
Summer/Winter Auto time change Temperature Offset
To enable: Set parameter 3:tC (category 1) to 1. Set parameter 12:tO (category 1) to the required offset value.
Upper/Lower Temperature Limit
Set parameter 6:uL (category 1) to the desired upper limit. Set parameter 7:LL (category 1)
Parameter Installer SetUp Number / Abbreviation (Press + or keys to select) Factory Setting Optional Setting
Category 1 Parameters Room Thermostat Settings
Display AM-PM / 24hr Display RESET Time / Temperature Program 1:Cl 2:rP Description 24 hr clock display Time / Temperature profile set to factory default Changes to 0 when one of the time/temp profiles are changed Automatic Summer/Winter Time Change Enabled Display 1 Description 12 hr AM / PM clock display Time / Temperature are as programmed To restore the factory profile set to 1
Automatic Summer/Winter Time Change LCD Backlighting Upper Temperature Limit Lower Temperature Limit Optimisation Temperature Offset Proportional Band Width Reset Parameters to Factory Defaults
Automatic Summer/Winter Time Change Disabled

5:bL 6:uL

Backlighting Enabled 35C Upper Temp. Limit
Backlighting Disabled 21C to 34C adjustment in 1C steps

5C Lower Temp. Limit

6 to 21
6C to 21C adjustment in 1C steps

8:0P 12:tO 13:Pb

Optimisation disabled No offset 1.5C Proportional Band

1 -3 to +3 1.6 to 3.0

Optimisation enabled -3C to +3C adjustment in 0.1C steps 1.6C to 3.0C adjustment in 0.1C steps
All settings held are the factory defaults. Changes to 0 when one of the parameter values are changed
Settings are as modified above
To restore the factory profile set to 1
4 EN0H 8557 UK07 R0 09/06


Installer SetUp Number / Abbreviation (Press + or keys to select)

Factory Setting

Optional Setting
Category 2 Parameters System Settings (press the > button to access this category)
Display Minimum boiler ON Time Cycle Rate Heat / Cool Change Pump Exercise System Synchronisation Loss of Communication Instruction 1:Ot 2:Cr 4:HC 5:PE 6:Sn 0 Description 1 minute minimum ON time 6 cycles per hour (cph) Disabled Pump Exercise Disabled Standard operation of the Room Unit Relay Off Display 2 to 5 3, 9 orDescription Selection of 2,3,4 or 5 minutes minimum ON time Selection of 3,9 or 12 cph Enabled Pump Exercise Enabled Room unit configured as Synchroniser

Relay 20% on / 80% off

The following parameters are for the control of other Honeywell Wireless products such as Wireless Underfloor Heating controls and Wireless Radiator controls. For more information please contact Honeywell sales. Room Temperature Sensor Use 8:Su 0 HC60 Control 1,2,3 or - HR80/HM80 control with own/remote sensor (no temperature displayed) 2 - Hr80/HM80/HCE80 control with CM Sensor 3 - HC60 control and HR80/HM80/ HCE80 control with own/remote sensor 4 Hr80/HM80/HCE80 control with own/ remote sensor (temperature displayed) HR80 Window-Open Function HR80 Local Override Maximum Flow Setpoint Minimum Flow Setpoint Mixing Value Run Time 9:HO 0 Disabled 1 Enabled

10:HL 11:uF

Enabled 55C Maximum Flow Temp.
Disabled 0C to 99C adjustments in 1C steps

12:LF 13:Ar

15 150
15C Minimum Flow Temp. 150 seconds

0 to to 240

0C to 50C adjustments in 1C steps 0 to 240 sec. adjustments in 1sec steps


5 EN0H 8557 UK07 R0 09/06


The CM921 is a radio frequency device and for the best performance should be installed in an open space. Leave at least 30cm distance from any metal objects including wall boxes and at least 1 metre from any other electrical equipment e.g. radio, TV, PC etc. Do not mount onto metal wall boxes. NOTE: It is recommended that the R6660D relay box is installed before commencing with the room unit installation (refer to the Installation Guide).

R6660D Relay box

CMT921A Room Unit


The R6660D relay box is designed for fixed wiring only and must be installed in accordance with latest l.E.E. regulations. Ensure the wiring connection to the supply is via a fuse rated at no more than 10 amps and a Class "A" switch (having contact separation of at least 3 mm in all poles). IMPORTANT 1. The installer must be a trained service engineer 2. Disconnect the power supply before beginning installation
6 EN0H 8557 UK07 R0 09/06
NOTE: All wiring must be in accordance with IEE regulations Caution: Observe ambient temperature and current limits (see the receiver box wiring label)


Description 1-day RF system pack (includes HC60) 1-day RF system pack (includes HC60) 1-day RF system pack (includes HC60) 1-day room unit spare 1-day room unit spare 1-day room unit spare HC60 Spare HC60 Spare HC60 Spare Model CMT921A1018 CMT921A1026 CMT921A1042 CMS921B1018 CMS921B1026 CMS921B1042 R6660D1017 R6660D1025 R6660D1041 Logo Honeywell Honeywell Honeywell Honeywell Honeywell Honeywell Honeywell Honeywell Honeywell Literature French & Dutch. French English (UK) French & Dutch. French Spanish French & Dutch. French English (UK) Availability Sep 06 Oct 06 Oct 06 Sep 06 Oct 06 Oct 06 Sep 06 Sep 06 Sep 06 Spec Sheet ENOH8557 ENOH8557 ENOH8557 ENOH8557 ENOH8557 ENOH8557 ENOH8557 ENOH8557 ENOH8557

Honeywell Control Systems Limited Newhouse Industrial Estate Motherwell ML1 5SB United Kingdom
7 EN0H 8557 UK07 R0 09/06



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