Honeywell Thermostat CM721 User Manual - Honeywell Thermostat Manual Download

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Sunday, April 5, 2020

Honeywell Thermostat CM721 User Manual

CM721...................................2-6
CM727.................................7-11
USER GUIDE


                                              1
                                                                              CM721 - USER GUIDE

Description                                  Features
The    Honeywell      CM721      is  a       •  Ergonomic user interface featuring an ‘OK-button’.
programmable       room    thermostat        •  Large LCD (Liquid Crystal Display) Screen.
designed    to control  your   heating 
system       efficiently,   providing        •  4 independent temperature levels (from 5°C to 35°C).
comfortable     temperatures     when        •  Automatic Summer/Winter Time Change.
you   are   at  home     and   energy        •   Optimum Start to achieve the right temperature at the 
savings   when   you  are  away.   The           right time.
following  instructions  explain  how 
                                             •  Built-in Memory holds the user program indefinitely.
to program and use the thermostat 
to provide the most home comfort 
at the least cost.

Controls Layout
                            1           2           3           4           5
                                                                                                      6
                                                                                   CM721

    14           D AT E
                                                                  AUTO                                7

    13

                                                                                   AUTO

    12                                                                              MAN
                                                                                                      8
                                                                                    OFF
                                     PROGRAM         1. . 4

                                                                                                      9

    11
                                                                                                     10


 1   LCD Screen                    6   Temperature Change Buttons           11   Battery Cover
 2   Battery Low Indicator         7   Temperature Enquiry Button           12   Program Buttons
 3   Time Display                  8   Operating Mode Buttons               13   Time Change Buttons
 4   Burner On Indicator           9   Green OK Button                      14   Set Date Button
 5   Temperature Display           10  Battery Compartment

   2
 SETTING-UP THE CM721                                                                 ‘Getting Started’

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 room temperature is already displayed 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.

STEP 2: Setting the Date and Time
To set the Date and Time:
a.  Press the DATE button to begin setting the date. When you set 
   the date for the first time after the batteries are inserted, the 
   display will show:
   Press the         or   buttons to set the current day of the month 
   (e.g. d 01 = 1st day of the month) then press the green                
   button to confirm.

b.  Press the         or    buttons to set the current month of the 
   year (e.g. m 01 = January) then press the green             button to 
   confirm.


c.  Press the        or    buttons to set the current year (e.g. yr 06 
   = 2006) then press the green           button to confirm.
   The date is now stored.


d.  Use the         or    buttons to set the correct time then press 
   the green        button to confirm. Each press of the buttons will 

   change  the  time  by  one  minute  and  holding  them  down  will                     AM
   change the time slowly at first and get progressively quicker.
   Note:  If  this  mode  is  entered  accidentally  then  press  the 
   AUTO, MAN or OFF buttons to exit. 

STEP 3: Running the Built-in Heating Program
The thermostat is now ready for operation. Press the AUTO button and the built-in heating program 
will start running. Note: The built-in heating program has been designed to provide normal comfort 
requirements, but if you want to customise the settings please see the next section ‘Programming 
the CM721’.
                                                                                                       3
 ‘Efficient Daily Use’                                              PROGRAMMING THE CM721

The Built-in Heating Program
The built-in heating program has 4 temperature level changes that can be set between 3.00am 
and 2.50am the following day - 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.

               Period                        1             2             3             4 
               Time                        6:30           8:00         18:00         22:30
               Temperature                 21°C          18°C          21°C          16°C

Reviewing the Heating Program
To review or edit the heating program use the PROGRAM                 or     buttons to navigate between 
the 4 individual programming periods.

Modifying the Heating Program
To change the heating program:
a.  Press  either  of the  PROGRAM           or      buttons   to 
    enter the programming mode. The time / temperature 
    settings for period   1   will be flashing  as  shown.  The 
    active  period   is  highlighted   by  a  flashing   square 
    around the numbers at the bottom of the screen.                                 1  2  3 4
b.  To adjust the period start time use the          or    buttons, the display will stop flashing and the 
    ‘OK?’ indicator 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 period, it 
    means the next period will be pushed forward.
c.  Once the required time is reached press the green             button to confirm.
    Note: If the original time setting did not require adjustment press the green            button to move 
    to step ‘d’.
d.  The temperature setting for period      1  will now be flashing. To adjust this press the          or     
    buttons and confirm the setting again by pressing the green              button.
e.  The  next time  and  temperature   period  will now  be  active. Adjust  this by repeating  steps  b - d 
    above until all 4 periods are set or press the AUTO button to run the program as set, at any time.

Disabling / Enabling Time Periods
The thermostat has 4 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 4 can be removed from (or 
returned to) the heating program profile.
To disable or enable time periods:
a.  To disable unwanted periods go to the desired period (       2  to 4 )  using the PROGRAM          or     
    buttons to navigate, ensure 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.
b.  To enable periods again follow the same procedure as above, navigating to the already disabled 
    period. To enable this period again press and hold the          button for at least 2 seconds.
   4
 OPERATING THE CM721                                                             ‘Using the Features’

Choosing the Operating Mode
The thermostat can operate in three different modes: Automatic, Manual or Off. To set the operating 
mode   press   either of  the AUTO,    MAN    or OFF   buttons.   The  screen   indicates  which   mode    is 
currently active by displaying AUTO, MAN or OFF.
•  AUTO (automatic) mode sets the thermostat to follow the built-in 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   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 sets the thermostat to control to a minimum temperature setting of 5°C (default) that 
   acts as a frost protection measure for your home.

During Normal Operation
•  Temperature Enquiry
   In  AUTO,    MAN    and   OFF   operating   modes    the  thermostat   will display   the current   room 
   temperature.    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 for 5 seconds before returning to the current room temperature value. 
•  Temperature Override
   During normal operation (AUTO mode) the programmed temperature can be adjusted manually 
   by pressing the        or    buttons or the    button. 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.

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.

Using the Special Features
•  SERVICE indicator
   Note:  This  option  only  works  if  activated  by  your 
   installer.
   The 'SERVICE' indicator is displayed at set intervals 
   as  a  reminder  that  your  heating  system  requires  a 
   routine check. Please call your installer to arrange a 
   maintenance visit.
   The  ‘SERVICE’  indicator  will  remain  on  the  display 
   of  the  CM721  until  it  is  either  reset  or  disabled  by 
   your  installer.  The  CM721  and  heating  system  will 
   continue to operate as normal.

                                                                                                       5
 ‘Using the Features’                                                     OPERATING THE CM721

•   Automatic Summer/Winter Time Change
    The CM721 has a built-in Automatic Summer/Winter Time Change feature that will automatically 
    adjust the clock forward or backward by one hour for ‘Daylight Saving Time’. This is carried out 
    on the last Sunday of March and October each year.

•   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.


 FAQ’s

How do I change the batteries on the                     BDR91 Relay Box Controls Layout
thermostat when they run out?                            The relay box will normally be found mounted 
The  thermostat   constantly  monitors  the battery      close to the boiler.
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. To change the batteries                                        Push button 
follow the steps  in the above   section (‘STEP 1:                                      and relay 
Installing  the  Batteries’ on page   3), replacing                                     status LED’s
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 settings to be correct.

How do I set one temperature for the                     What does it mean when the BDR91 
whole day?                                               relay box green LED is ON?
To  operate   as  a simple   thermostat   with one       The green LED indicates normal operation of 
temperature    throughout    the  day,  select  the      the radio frequency system. When the green 
manual    operating    mode     by  pressing    the      LED is ON the boiler is also ON. When the LED 
MAN     button.   Adjust   the   temperature     by      is OFF the boiler is OFF.
pressing   the       or    buttons   - this can  be 
set anywhere from 5°C to 35°C in 0.5°C steps.            When  do  I  need  to  use  the  push 
The   thermostat   will continue  to maintain   this     button?
temperature    until another  operating   mode    is 
selected or the temperature is adjusted.                 You should use the push button to control your 
                                                         boiler only when the RF communication is lost 
                                                         (see the Troubleshooting Guide).

   6
TROUBLESHOOTING THE CM721

Symptom                                     Remedy

Blank Display (Power Loss).                 Check batteries are installed by removing the battery 
                                            cover.

                                            Check batteries have been installed in the correct 
                                            orientation.

                                            Replace the batteries.

Display shows flashing                      The batteries in the thermostat are low on power 
symbol.                                     - Replace the batteries.

Display shows             symbol.           A fault has occurred in your heating system. Remove 
                                            and re-insert the batteries.

                                            If the         symbol does not clear after a few minutes 
                                            contact your installer.

Display shows the word 'SERVICE'            Your installer has set a scheduled maintenance alert 
                                            period on your CM721 as a recommendation that your 
                                            heating system should receive a routine inspection.

                                            Call your installer to arrange a maintenance visit.

                                            Note: The CM721 and heating system will continue to 
                                            operate as normal.

BDR91 red LED is constantly on              RF communication lost due to the wrong location of 
or flashing                                 the room unit - Hook the room unit back on the wall 
                                            bracket where RF communication was reliable.

                                            Call installer

                                            NOTE: You can control the boiler manually when the 
                                            RF communication is lost: Press the BDR91 push 
                                            button to switch the boiler on and off. When the green 
                                            LED is on – the boiler is on.


                                                                                                      7
                                                                              CM727 - USER GUIDE

Description                                Features
The    Honeywell      CM727      is  a     •  Ergonomic user interface featuring an ‘OK-button’.
programmable       room    thermostat      •  Large LCD (Liquid Crystal Display) Screen.
designed    to control  your   heating     •  7-day heating program to match your lifestyle, whilst 
system       efficiently,   providing         maximising energy savings.
comfortable     temperatures     when 
you   are   at  home     and   energy      •  4 independent temperature levels per day (from 5°C to 35°C).
savings   when   you  are  away.   The     •  Holiday button saves energy by letting you reduce the 
following  instructions  explain  how         temperature for 1 to 99 days.
to program and use the thermostat          •  Automatic Summer/Winter Time Change.
to provide the most home comfort           •  Optimum Start to achieve the right temperature at the 
at the least cost.                            right time.
                                           •  Built-in Memory holds the user program indefinitely.
Controls Layout
                            1           2           3           4           5           6
    17
                                                                                                      7

                                     1     2    3     4    5     6    7            CM727
                DATE/
    16           D AY
                                                                  AUTO                                8

                COPY
    15           D AY

                                                                                   AUTO

    14                                                                              MAN
                                                                                                      9
                                                                                    OFF
                                     PROGRAM         1. . 4
    13
                                                                                                     10

    12
                                                                                                     11


 1   LCD Screen                    7   Temperature Change Buttons           13   Holiday Function Button
 2   Battery Low Indicator         8   Temperature Enquiry Button           14   Program Buttons
 3   Time Display                  9   Operating Mode Buttons               15   Copy Day Button
 4   Burner On Indicator           10  Green OK Button                      16   Set Date/Day Button
 5   Day Indicator                 11  Battery Compartment                  17   Time Change Buttons
 6   Temperature Display           12  Battery Cover

   8
 SETTING-UP THE CM727                                                                 ‘Getting Started’

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 room temperature is already displayed 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 8).
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.

STEP 2: Setting the Date and Time
To set the Date and Time:
a.  Press the  DATE/DAY     button  to begin   setting the  date. When 
   you set the date for the first time after the batteries are inserted, 
   the display will show:
   Press the         or   buttons to set the current day of the month 
   (e.g. d 01 = 1st day of the month) then press the green                
   button to confirm.

b.  Press the         or    buttons to set the current month of the 
   year (e.g. m 01 = January) then press the green             button to 
   confirm.


c.  Press the        or    buttons to set the current year (e.g. yr 06 
   = 2006) then press the green           button to confirm.
   The date is now stored and the Day Indicator will be displayed 
   under  the  current  day  of  the  week  (e.g.  1  =  Monday,  2  = 
   Tuesday, etc.)

d.  Use the         or    buttons to set the correct time then press 
   the green        button to confirm. Each press of the buttons will 
   change  the  time  by  one  minute  and  holding  them  down  will 
                                                                                          AM
   change the time slowly at first and get progressively quicker.
   Note:  If  this  mode  is  entered  accidentally  then  press  the 
   AUTO, MAN or OFF buttons to exit. 

STEP 3: Running the Built-in Heating Program
The thermostat is now ready for operation. Press the AUTO button and the built-in heating program 
will start running. Note: The built-in heating program has been designed to provide normal comfort 
requirements, but if you want to customise the settings please see the next section ‘Programming 
the CM727’.
                                                                                                       9
 ‘Efficient Daily Use’                                              PROGRAMMING THE CM727

The Built-in Heating Program
The built-in heating program has 4 temperature level changes per day that can be set between 
3.00am    and  2.50am   the  following day   - 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.

    Monday to Friday         Period                        1             2             3             4 
           (Day 1 to 5)
                             Time                        6:30           8:00         18:00         22:30
                             Temperature                 21°C          18°C          21°C          16°C

  Saturday & Sunday          Period                        1             2             3             4 
           (Day 6 & 7)
                             Time                        8:00          10:00         18:00         23:00
                             Temperature                 21°C          21°C          21°C          16°C

Reviewing the Heating Program
To review or edit the heating program use the PROGRAM              or     buttons to navigate between the 
4 individual programming periods for that day. Use the DATE/DAY button to step through each day of 
the week, so the complete 7 day heating program can be reviewed or edited.

Modifying the Heating Program
To change the heating program:
                                                                        1    2     3     4    5     6    7
a.  Press  either of  the PROGRAM           or      buttons  to 
    enter the programming mode. The time / temperature 
    settings  for period   1   on  Monday    (Day   1)  will be 
    flashing as shown. The active period is highlighted by 
    a flashing square around the numbers at the bottom of 
    the screen and the selected day is shown with the day                           1  2  3 4
    indicator.
b.  To adjust the period start time use the         or    buttons, the ‘OK?’ indicator will be displayed to 
    confirm the change. Holding the button down will change the time quickly.
    Note: If you are pressing the            or    buttons and the display flashes the next period, it 
    means the next period will be pushed forward.
c.  Once the required time is reached press the green             button to confirm.
    Note: If the original time setting did not require adjustment press the green            button to move 
    to step ‘d’.
d.  The temperature setting for period      1  on Monday (Day 1) will now be flashing. To adjust this 
    press the       or    buttons and confirm the setting again by pressing the green              button.
e.  The next time and temperature period will now be active. Adjust this by repeating steps b - d 
    above until all 4 periods are set for Monday or press the AUTO button to run the program as 
    set, at any time.
You now have a choice of how to set the program for the next day:


   10
 PROGRAMMING THE CM727                                                            ‘Efficient Daily Use’

f.  i) Press the COPY DAY button to copy Monday’s program into Tuesday. The display will go blank 
   apart from the ‘non flashing’ day indicator, which indicates the day copied and the ‘flashing’ target 
   day to copy the program to. To accept this day press the green              button. To select a different 
   target  day  press  the DATE/DAY     button  until the ‘flashing’ day  indicator  is under  the required 
   day, then accept it by pressing the green           button. Note: Once the target day is confirmed it 
   becomes the day that is copied if the COPY DAY button is pressed again.
   OR
   ii) Press the DATE/DAY    button to move the day indicator to Tuesday (Day 2). The program for that 
   day can then be adjusted by following steps b to e. Programs for the remaining days can be set in 
   the same way, using the DATE/DAY       button to move to the next day.
To exit the programming mode select the desired operating mode by pressing the AUTO, MAN or 
OFF buttons. Note: To run the adjusted program select the AUTO mode.

Disabling / Enabling Time Periods
The thermostat has 4 periods each day that can be programmed, but you may not need all of these 
switch points for your heating requirements. Therefore, any period from 2 to 4 can be removed from 
(or returned to) the heating program profile.
To disable or enable time periods:
a.  To disable unwanted periods go to the desired period (       2  to 4 )  using the PROGRAM          or    
   buttons to navigate, ensure 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.
b.  To enable periods again follow the same procedure as above, navigating to the already disabled 
   period. To enable this period again press and hold the          button for at least 2 seconds.


 OPERATING THE CM727                                                             ‘Using the Features’

Choosing the Operating Mode
The thermostat can operate in three different modes: Automatic, Manual or Off. To set the operating 
mode   press   either of  the AUTO,    MAN    or OFF   buttons.   The  screen   indicates  which   mode    is 
currently active by displaying AUTO, MAN or OFF.
•  AUTO (automatic) mode sets the thermostat to follow the built-in 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 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 sets the thermostat to control to a minimum temperature setting of 5°C (default) that 
   acts as a frost protection measure for your home.


                                                                                                       11
 ‘Using the Features’                                                     OPERATING THE CM727

During Normal Operation
•   Temperature Enquiry
    In AUTO,    MAN    and   OFF   operating    modes    the thermostat    will display  the  current  room 
    temperature.   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 for 5 seconds before returning to the current room temperature value. 
•   Temperature Override
    During normal operation (AUTO mode) the programmed temperature can be adjusted manually 
    by pressing the        or   buttons or the     button. 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.

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.

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.  Ensure the thermostat is running in AUTO or MAN operating modes.
    b.  Press the holiday       button to display the holiday days counter and temperature setting, 
       along with the holiday indicator       .
    c.  Press the        or    time buttons to set the holiday time (1 - 99 days) and press the green 
             button to confirm. 
    d.  Press the       or    buttons to set the holiday temperature (5°C - 35°C) and press the green 
             button to confirm.

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 MAN or AUTO mode. To 
cancel the HOLIDAY function or to exit the function at any time press the          button a second time.


   12
 PROGRAMMING THE CM727                                                           ‘Using the Features’

Using the Special Features
•  SERVICE indicator (optional)
   Note: This option only works if activated by your installer.
   The  'SERVICE'  indicator  is  displayed  at  set 
   intervals as a reminder that your heating system 
   requires a routine check. Please call your installer 
   to arrange a maintenance visit.
   The ‘SERVICE’ indicator will remain on the display 
   of the CM727 until it is either reset or disabled by 
   your installer. The CM727 and heating system will 
   continue to operate as normal.

•  Automatic Summer/Winter Time Change
   The CM727 has a built-in Automatic Summer/Winter Time Change feature that will automatically 
   adjust the clock forward or backward by one hour for ‘Daylight Saving Time’. This is carried out 
   on the last Sunday of March and October each year.

•  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.


                                                                                                      13
                                                                                                    FAQ’s

How do I change the batteries on the                     BDR91 Relay Box Controls Layout
thermostat when they run out?                            The relay box will normally be found mounted 
The  thermostat   constantly  monitors  the battery      close to the boiler.
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. To change the batteries 
                                                                                         Push button 
follow the steps  in the above   section (‘STEP 1: 
                                                                                         and relay 
Installing  the  Batteries’ on page   3), replacing 
                                                                                         status LED’s
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 settings to be correct.

How do I set one temperature for the                     What does it mean when the BDR91 
whole day?                                               relay box green LED is ON?
To  operate   as  a simple   thermostat   with one       The green LED indicates normal operation of 
temperature    throughout    the  day,  select  the      the radio frequency system. When the green 
manual    operating    mode     by  pressing    the      LED is ON the boiler is also ON. When the LED 
MAN     button.   Adjust   the   temperature     by      is OFF the boiler is OFF.
pressing   the       or    buttons   - this can  be 
set anywhere from 5°C to 35°C in 0.5°C steps.            When  do  I  need  to  use  the  push 
The   thermostat   will continue  to maintain   this     button?
temperature    until another  operating   mode    is 
selected or the temperature is adjusted.                 You should use the push button to control your 
                                                         boiler only when the RF communication is lost 
                                                         (see the Troubleshooting Guide).


  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 Environmental 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.

   14
TROUBLESHOOTING  THE CM727

Symptom                                     Remedy

Blank Display (Power Loss).                 Check batteries are installed by removing the battery 
                                            cover.

                                            Check batteries have been installed in the correct 
                                            orientation.

                                            Replace the batteries.

Display shows flashing                      The batteries in the thermostat are low on power 
symbol.                                     - Replace the batteries.

Display shows             symbol.           A fault has occurred in your heating system. Remove 
                                            and re-insert the batteries.

                                            If the         symbol does not clear after a few minutes 
                                            contact your installer.

Display shows the word 'SERVICE'            Your installer has set a scheduled maintenance alert 
                                            period on your CM727 as a recommendation that your 
                                            heating system should receive a routine inspection.

                                            Call your installer to arrange a maintenance visit.

                                            Note: The CM727 and heating system will continue to 
                                            operate as normal.

BDR91 red LED is constantly on              RF communication lost due to the wrong location of 
or flashing                                 the room unit - Hook the room unit back on the wall 
                                            bracket where RF communication was reliable.

                                            Call installer

                                            NOTE: You can control the boiler manually when the 
                                            RF communication is lost: Press the BDR91 push 
                                            button to switch the boiler on and off. When the green 
                                            LED is on – the boiler is on.


                                                                                                     15
                                                              ®


 WHAT IS A PROGRAMMABLE ROOM THERMOSTAT?

...an explanation for householders
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 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 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 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.

Honeywell Control Systems Ltd.
Arlington Business Park,
Bracknell
Berkshire
RG12 1EB
Technical Help Desk: 08457 678999                   50039991-003 A
www.honeywelluk.com                                 © 2009 Honeywell International Inc.
   16

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