Honeywell thermostat CM921 1 Day Wireless Programmable Thermostat User Manual

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fINE TuNING THE CM921
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 Cause
Remedy
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 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  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 bracketTable stand
Push button and relay status LED’s 
						

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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    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  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  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
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How do I operate an HR 80 radiator controller with my CM921?
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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