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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 Layout
Day / 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.