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Honeywell CM927 User Manual

7 day wireless programmable room thermostat with lot technology
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Honeywell Control Systems Ltd.
Arlington Business Park,
RG12 1EB
Technical Help Desk: 08457 678999
42011077-703 R1
© 2006 Honeywell International Inc.
CM927 - User Guide
7 day Wireless Programmable Room Thermostat
with LoT Technology
The Honeywell CM927 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. With 'wireless' communication
there is no need to provide a wired connection between the thermostat and boiler.
The following instructions explain how to set up, program and operate your
Honeywell CM927 Programmable Room Thermostat.
Wireless connection to the boiler allows you to mount the Chronotherm in your
room without decor disruption
Armchair programming feature lets you program your Chronotherm while
resting comfortably in your armchair
Ergonomic User Interface features an 'OK-button' making the CM927 very
easy to use so you always stay in control.
LoT Technology 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.
7-day heating program lets you set the CM927 independently for each day of
the week to match your lifestyle, whilst maximizing energy savings.
6 independent temperature levels per day lets you set any 6 temperatures you
require (from 5 to 35°C) so you can enjoy economical comfort every 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.
Party button lets you temporarily maintain (or adjust) the current temperature for 1
- 23 hours. Useful when you have guests or leave the house for a short period.
Day Off button copies Sunday's program into any other day of the week, so that
you can make the CM927 follow this program if you have a day or days off.
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.
Optimum Start option is an advanced feature which ensures that the optimum
temperature conditions are achieved at the required times (option set by your



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  Summary of Contents for Honeywell CM927

  • Page 1 Day Off button copies Sunday’s program into any other day of the week, so that CM927 - User Guide you can make the CM927 follow this program if you have a day or days off. Honeywell Control Systems Ltd. Arlington Business Park,...
  • Page 2: Table Of Contents

    WHAT IS A PROGRAMMABLE ROOM THERMOSTAT? Green OK Button An explanation for householders ........19 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.
  • Page 3: Step 1: Installing The Batteries

    GETTING STARTED WITH THE CM927 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

    GETTING STARTED WITH THE CM927 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.
  • Page 5: Programming The Cm927

    THE CM927 The Built-in Heating Program The built-in heating program has 6 temperature level changes per day that can be set between 3.00am and 2.50am the following day - 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.
  • Page 6 THE CM927 b. To adjust the period start time press the buttons and ‘TIME 1 OK?’ will be displayed. Holding the button down will change the time quickly. Note: If you are pressing the buttons and the display flashes the next...
  • Page 7: Disabling / Enabling Time Periods

    THE CM927 To exit the programming mode move the slider switch to the desired operating mode - AUTO, MAN or OFF. Note: To run the adjusted program select the AUTO mode. 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’...
  • Page 8: Operating The Cm927

    THE CM927 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.
  • Page 9: Temperature Override

    THE CM927 • Temperature Override During normal operation (AUTO mode) the programmed temperature can be adjusted manually by pressing the buttons. The ‘target‘ temperature will be displayed and flash for 5 seconds – during this time the buttons can be used to modify the set value.
  • Page 10: Party Function

    THE CM927 • PARTY Function The party function allows you to extend your heating program by a specified number of hours at a particular temperature before resuming with the normal temperature program. This is especially useful when you want to maintain or increase the temperature during a special occasion such as a party or when entertaining guests.
  • Page 11: Day Off Function

    THE CM927 • DAY OFF FUNCTION The day off function allows you to temporarily run Sunday’s heating program for as many days as you desire. This is useful when you have a day off during your normal week or will, unintentionally, be at home on a workday due to illness, etc.
  • Page 12: Fine Tuning The Cm927

    TuNING THE CM927 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 13: Change The Time Format

    TuNING THE CM927 c. Now choose which one of the following parameters you would like to change: i) Change the time format ‘CLOCK SELECT’ should be displayed on the screen - press the buttons to select the preferred time format (12=AM/PM format, 24=24hr format) and the display will flash, indicating a change has been made.
  • Page 14: Faq's & Troubleshooting

    fAq’s & TRoublESHooTING...
  • Page 15 fAq’s & TRoublESHooTING...
  • Page 16 & TRoublESHooTING How do I change the batteries on the CM927 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 17 fAq’s & TRoublESHooTING How do I remove the thermostat from the table stand or wall bracket? After programming is finished always replace the thermostat back on the wall holder or table stand. Wall bracket Table stand HC60NG Relay Box Controls Layout Push button and relay status LED’s What does it mean when the HC60NG relay box green LED is ON?
  • Page 18 & TRoublESHooTING Can I use my CM927 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).