Honeywell thermostat CM927 7 Day Wireless Programmable Thermostat User Manual

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opERATING THE CM927
•	DAY OFF FUNCTION
 The day off function allows you to temporarily run Sunday’s heating program for as many days as you desire. This is useful when you have a day off during your 
normal  week  or  will,  unintentionally,  be  at  home  on  a  workday  due  to  illness, 
etc.
 To set the Day Off function:
 a. Move the slider switch to the AUTO position.
  b. Press  the   button  to  display  the  days  off  counter,  ‘DAYS  OFF’  will  be 
displayed and the day off indicator  will appear.
 c.  Press  the    or  buttons  to  set  the  number  of  days  (1  –  99  days)  you 
would like the alternative heating program to run for.
  Note:  (The  day  and  date  will  update  according  to  the  number  of  days 
selected).
 d.  Press the green  button to confirm the setting.
  e. On  confirmation  ‘CHANGES  SAVED’  will  be  displayed  on  the  screen  for  a moment and then will return to the normal display, with the days off indicator 
displayed.
  The  thermostat  will  now  control  to  the  alternative  heating  program  for  the  set number of days before resuming with the normal heating program. To cancel the 
DAY OFF mode or to exit the function at any time press the  button a second 
time or move the slider switch to a different position.
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. 
						

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fINE TuNING THE CM927
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:
COPY
D A Y D A Y
1 . . 6C M 9 2 7
D A T E
PROG A U T O
MANOFFOFF  
						

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fINE TuNING THE CM927
c. Now choose which one of the following parameters you would like to chang\
e:
 i) Change the time format
  ‘CLOCK  SELECT’  should  be  displayed  on  the  screen  -  press  the    or  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
 Press  the    time  button  once.  The  display  will  show  ‘RESET  PROGRAM’. 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
 Press the   time button twice. The display will show ‘AUTO CHANGE’. Press 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. 
						

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Symptom
Possible CauseRemedy
The thermostat has a blank LCD 
screen. Batteries not installed.
Check to see if there are batteries in the battery 
compartment and the paper tab has been removed.
Incorrect battery orientation.
Check that the batteries have been installed in the 
correctorientation.
Exhausted batteries. Replace with new batteries.
The thermostat shows a flashing 
 symbol on the LCD screen.
Batteries are exhausted and 
need replacing.
Replace with new batteries.
The thermostat’s 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 BDR91 as a value 
between 0-100%. The BDR91 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.
The thermostat shows a flashing 
 symbol on the LCD 
screen. Fault in thermostat
Remove and re-insert the batteries in the thermostat. 
If the 
 symbol does not clear itself in a few 
minutes call the installer.
Troubleshooting Guide
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Symptom
Possible Cause Remedy
The thermostat’s LCD display 
works but the heating does not 
switch on (BDR91 LEDs are off 
or green one is on). No power to heating system.
Check that there is power to the 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.
Wrong electrical connection. Call electrical installer to check the boiler and BDR91 
power supply as well as the connection between the 
boiler and the BDR91.
The red LED on the BDR91 is 
constantly on or flashing. RF communication lost due 
to the wrong location of the 
thermostat.Hook the 
thermostat
 back on the wall bracket or 
replace the 
thermostat
 on the table stand in the 
position where RF communication was reliable.
RF communication fault.
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.
Heating switches ON or OFF too 
slowly or quickly. The thermostat not set 
correctly for your system.Call Installer.
Temperature swings between 
too hot and too cold. The thermostat not set 
correctly for your system.Call Installer. 
						

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How do I change the batteries on the CM927 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  5°C  to  35°C  in  0.5°C  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.
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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.
BDR91 Relay Box Controls Layout
What does it mean when the BDR91 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 O\
FF.
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Wall bracket Table stand
Push button and relay status LED’s 
						

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Can I use my CM927 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   and   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 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:
Monday to f riday
period  1 2 3  4 5  6
Time  6:30 8:00 12:00  14:00 18:00  22:30
Temperature 24°C  28°C 24°C  28°C 24°C  24°C
Saturday & Sunday
period  1 2 3  4 5  6
Time  8:00 10:00  12:00  14:00 18:00  23:00
Temperature 24°C  24°C 24°C  24°C 24°C  24°C
How do I operate an HR 80 radiator controller with my CM927?
1.
 Display: Shows current set temperature and device information.
2.
  Adjustment dial on the operating unit: Allows manual temperature adjustment.
3.
 Symbol for the RF connection to the command centre.
4.  Symbol  for  separating  the  operating  unit  and coupling module.
5.
  Set temperature.
6. Symbol  for  actual  value  coming  from  the  room thermostat (see installation manual 4.5.2).
Changing the set temperature with adjustment dial
The setpoint is normally defined and controlled at the room thermostat. To override the 
local setpoint, turn the adjustment dial of the radiator controller unit until the desired 
set temperature (between 5 - 30 °C) is displayed. This local setpoint override remains 
valid until a time program from the room thermostats overwrites it automatically.
In  order  to  open  or  close  the  radiator  valve  completely  turn  the  adjustment  dial 
until  “OFF”  (closed)  or  “ON”  (opened)  is  displayed.  (If  temperature  limits  are  set, 
“ON”/”OFF” is not displayed - see installation manual 4.5.1)\
.
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