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Honeywell CM901 User Manual

1 day programmable room thermostat
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Honeywell Control Systems Ltd.
Arlington Business Park,
RG12 1EB
Technical Help Desk: 08457 678999
42010943-103 R1
© 2005 Honeywell International Inc.
CM901 - User Guide
1 day Programmable
Room Thermostat
The Honeywell CM901 is a programmable room thermostat designed to
control your heating system efficiently, providing comfortable temperatures
when you are at home and energy savings when you are away. The following
instructions explain how to program and use the CM901 to provide the most
home comfort at the least cost.
Ergonomic User Interface features an 'OK-button' making the CM901 very
easy to use so you always stay in control.
Dynamic Text Display provides informative 'on-screen' feedback and
operational assistance to the user.
Extra Large LCD (Liquid Crystal Display) Screen with Backlight provides
added user friendliness and clearer viewing – even in the dark.
6 independent temperature levels lets you set any 6 temperatures you require
(from 5 to 35°C) so you can enjoy economical comfort throughout the day.
Holiday button saves energy by letting you reduce the temperature for 1 to 99
days while you are away from home, resuming normal operation on your return.
Automatic Summer/Winter Time Change will adjust the clock automatically
for 'Daylight Saving Time'.
Built-in Memory holds the user program indefinitely so that it is never lost
– even if you remove the batteries.
Outside Temperature Sensor (optional accessory) can be fitted to the
CM901 to display the temperature outside your home.
Remote Temperature Sensor (optional accessory) can be fitted to the CM901
to control to the room temperature in another location, concealing the CM901.
Optimum Start option is an advanced feature which ensures that the optimum
temperature conditions are achieved at the required times.



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  Summary of Contents for Honeywell CM901

  • Page 1 The following instructions explain how to program and use the CM901 to provide the most home comfort at the least cost.
  • Page 2: Table Of Contents

    Temperature Change Buttons Time Change Buttons Temperature Enquiry Button Contents GETTING STARTED WITH THE CM901 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 CM901 The Built-in Heating Program...
  • Page 3: Step 1: Installing The Batteries

    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.
  • Page 4: Step 2: Setting The Date And Time

    NOT be saved. STEP 3: Running the Built-in Heating Program The thermostat is now ready for operation. Move the slider switch to the AUTO position and the built-in heating program will start running. The built-in heating...
  • Page 5: Programming The Cm901

    TIME 1’ will be displayed and the time settings for period active period is highlighted by a flashing square symbol around the numbers at the bottom of the screen. DATE PROG AUTO PROGRAMMING THE CM901 8:00 12:00 14:00 18°C 21°C 18°C...
  • Page 6 Note: If the unit is left in programming mode for more than 10 minutes without the slider being moved or any buttons pressed, ‘MOVE THE SLIDER’ will be displayed. Press a button to finish programming the thermostat or move the slider to select the desired operating mode.
  • Page 7: Disabling / Enabling Time Periods

    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:...
  • Page 8: Operating The Cm901

    • MAN (manual) mode Manual mode sets the thermostat to act as a simple thermostat with a fixed setpoint throughout the day. The setpoint can be adjusted from 5°C to 35°C by using the buttons. The thermostat will continue to maintain this temperature until another operating mode or temperature is selected.
  • Page 9: Temperature Override

    The thermostat will now control to the new temperature for the set number of days that your home is vacant. At midnight the holiday counter will be reduced by one until the selected number of days have passed.
  • Page 10: Fine Tuning The Cm901

    FINE TUNING THE CM901 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.
  • Page 11: Change The Time Format

    On) and the display will flash, indicating a change has been made. To confirm this change press the green d. To exit the user mode move the slider switch to the AUTO, MAN or OFF position. FINE TUNING THE CM901 button. button. button.
  • Page 12: Faq's & Troubleshooting

    FAQ’s & TROUBLESHOOTING How do I change the batteries on the CM901 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.
  • Page 13 Can I use my CM901 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 buttons together for 5 seconds in any of the product operating modes (AUTO, MAN or OFF).
  • Page 14 FAQ’s & TROUBLESHOOTING What other accessories can I buy that work with the CM901? 1. Outside Temperature Sensor Accessory The Outside Temperature Sensor accessory can be fitted to your thermostat to display the outside temperature. By pressing the displays the external temperature.
  • Page 16: What Is A Programmable Room Thermostat

    The way to set and use your programmable room thermostat is to find the lowest temperature settings that you are comfortable with at the different times you have chosen, and then leave it alone to do its job.
  • Page 17 Programmable room thermostats need a free flow of air to sense the temperature, so they must not be covered by curtains or blocked by furniture. Nearby electric fires, televisions, wall or table lamps may prevent the thermostat from working properly.
  • Page 18 42010943-103 R1...

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