Contents
GETTING STARTED WITH THE CM921
STEP 1: Installing the Batteries .........................................3
STEP 2: Setting the Date and Time ...................................4
STEP 3: Running the Built-In Heating Program ................4
PROGRAMMING THE CM921
The Built-in Heating Program ............................................5
Reviewing the Heating Program .......................................5
Modifying the Heating Program ........................................5
Disabling / Enabling Time Periods ...................................7
OPERATING THE CM921
Choosing the Operating Mode .........................................8
AUTO mode.............................................................8
MAN mode ..............................................................8
OFF mode................................................................8
Adjusting the Time ............................................................8
During Normal Operation..................................................8
Temperature Enquiry ...............................................8
Temperature Override .............................................9
Using the Special Functions .............................................9
HOLIDAY Function ..................................................9
FINE TUNING THE CM921
Changing the User Parameters ......................................10
Change the Time Format .......................................11
Reset the Built-in Program .....................................11
Summer / Winter Time Change .............................11
FAQ’s & TROUBLESHOOTING
Trouble Shooting Guide ..................................................12
Frequently Asked Questions ...........................................14
WHAT IS A PROGRAMMABLE ROOM THERMOSTAT?
An explanation for householders ....................................17
Controls LayoutDay / Date Display
Time Display
LoT technology Display
Heating On Indicator
Battery Low Indicator
Temperature Display
Temperature Change Buttons
Temperature Enquiry Button
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Slider Switch
Green OK Button
Program Buttons
Battery Compartment Lid
Battery Compartment
Holiday Function Button
Time Change Buttons
1..6
AUTOMANOFF
CM921
DATE
PROG
AUTO
MAN
OFF
14
15
1 2 3 54 6
8
9
10
7
13 12 11
Manufactured for and on behalf of the Environment and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37,
Switzerland by its Authorised Representative Honeywell International Inc.