Honeywell thermostat CM921 1 Day Wireless Programmable Thermostat User Manual

							Honeywell Control Systems Ltd.Arlington Business Park,BracknellBerkshireRG12 1EBTechnical Help Desk: 08457 678999www.honeywelluk.com
CM921 - User Guide
1 day Wireless Programmable Room Thermostat
with LoT technology
42011077-103 R2 (draft2)© 2009 Honeywell International Inc.
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).
...an explanation for householdersA  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 18°C, and then turn them up by one degree each  day  until  you  are  comfortable  with  the  temperatures.  You  won’t  have  to  adjust  the  thermostat further. Any adjustments above these settings will waste energy and cost you mo\
re 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  don’t  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 manufacturer’s 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.
WHAT IS A PROGRAMMABLE ROOM THERMOSTAT? 
						

							1 . . 6
AUTOMANOFF 
C M 9 2 1
DATEPROGAUTOMANOFF
Contents
GETTING STARTED WITH THE CM921
STEP 1: Installing the Batteries .........................................3STEP 2: Setting the Date and Time ...................................4STEP 3: Running the Built-In Heating Program  ................4
PROGRAMMING  THE CM921
The Built-in Heating Program ............................................5Reviewing the Heating Program  .......................................5Modifying the Heating Program ........................................5Disabling / Enabling Time Periods  ...................................7
OPERATING  THE CM921
Choosing the Operating Mode .........................................8  AUTO mode.............................................................8 MAN mode ..............................................................8  OFF mode................................................................8Adjusting the Time ............................................................8During Normal Operation..................................................8  Temperature Enquiry ...............................................8  Temperature Override .............................................9Using 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
FAQ’s &  TROUBLESHOOTING
Trouble Shooting Guide ..................................................12Frequently Asked Questions ...........................................14
WHAT IS A PROGRAMMABLE ROOM THERMOSTAT?
An explanation for householders  ....................................20
Controls Layout
Day / Date Display
Time Display
LoT technology Display
Heating On Indicator
Battery Low Indicator
Temperature Display
Temperature Change Buttons
Temperature Enquiry Button
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Slider Switch
Green OK Button
Program Buttons
Battery Compartment Lid
Battery Compartment
Holiday Function Button
Time Change Buttons
14
15
123546
8
9
10
7
131211
This product and its associated documentation and packaging are protected by various intellectual property rights belonging to Honeywell Inc. and its subsidiaries and existing under the laws of the UK  and  other  countries.  These  intellectual  and  property  rights  may  include  patent  applications, registered  designs,  unregistered  designs,  registered  trade  marks,  unregistered  trade  marks  and copyrights.
Honeywell  reserves  the  right  to  modify  this  document,  product  and  functionality  without  notice. This document replaces any previously issued instructions and is only applicable to the product(s) described.
This  product  has  been  designed  for  applications  as  described  within  this  document.  For  use outside  of  the  scope  as  described  herein,  refer  to  Honeywell  for  guidance.  Honeywell  cannot  be held responsible for misapplication of the product(s) described within this document.
Manufactured  for  and  on  behalf  of  the  Environment  and  Combustion  Controls  Division  of  Honeywell Technologies  Sàrl,  ACS-ECC  EMEA,  Z.A.  La  Pièce  16,  1180  Rolle,  Switzerland  by  its  Authorised Representative Honeywell Inc. 
						

							3
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.
GETTING STARTED WITH THE CM921 
PLEASE RESPECT YOUR ENVIRONMENT!Take care to dispose of used batteries carefully. 
						

							4
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’.
GETTING STARTED WITH THE CM921 
D A T EPROGAU T OMANOFF 
						

							5
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  5°C  and  35°C,  and adjusted in 0.5°C increments. The factory default program for heating is as follows:
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.
Period  1 2 3  4 5  6
Time  6:30 8:00 12:00  14:00 18:00  22:30
Temperature 21°C  18°C 21°C  18°C 21°C  16°C
D A T EPROGAU T OMANOFF
165432 
						

							6
pRoGRAMMING THE CM921 
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. 
						

							7
pRoGRAMMING THE CM921 
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. 
						

							8
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.
•	MAN (manual) mode
 Manual  mode  sets  the  thermostat  to  act  as  a  simple  thermostat  with  a  fixed setpoint  throughout  the  day.  The  setpoint  can  be  adjusted  from  5°C  to  35°C by  using  the    or   buttons.  The  thermostat  will  continue  to  maintain  this temperature until another operating mode or temperature is selected.
•	OFF mode
 Off mode sets the thermostat to control to a minimum temperature setting of 5°C (default) that acts as a frost protection measure for your home. This value can be adjusted by calling your installer.
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. 
						

							9
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 – 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  =  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,  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 (1 – 99 days). 
  Note:  (The  day  and  date  will  update  according  to  the  number  of  days selected).
 d. Press the green  button to confirm the setting. 
 e.  ‘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)
 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. 
						

							10
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:
a. Move the slider switch to the OFF position, then press and hold the  button for approximately 5 seconds. button for approximately 5 seconds.
b. Once entered the following information will be shown on the screen:
1 . . 6C M 9 2 1
D A T EPROGA U T OMANOFF
OFF