Honeywell CM921 User Manual

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.

Honeywell CM921 Specifications

General

Type	Programmable Thermostat
Display	LCD
Programming	7-day programmable
Power Source	2 x AA batteries
Temperature Range	5°C to 35°C
Mounting	Wall-mounted
Voltage	230V
Frequency	50 Hz
Accuracy	±0.5°C
Control Mode	Heating
Backup	Battery backup