Honeywell thermostat CM927 7 Day Wireless Programmable Thermostat User Manual

11
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...

12
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...

13
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....

14
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...

15
fA q’s &  TR oublESHoo TING
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...

16
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...

17
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.
fA q’s &  TR oublESHoo TING
Wall bracket Table stand
Push button and relay...

1850039989-003 A
fA q’s &  TR oublESHoo TING
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...