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....

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...