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Description
The Honeywell CM921 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 CM921 Programmable Room Thermostat.
Features
Wireless connection to the boile
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Controls Layout Contents GETTING STARTED WITH THE CM921 1 2 3 4 5 6 STEP 1: Installing the Batteries ......................................... 3 7 STEP 2: Setting the Date and Time ................................... 4 STEP 3: Running the Built-In Heating Program ................ 4 8 PROGRAMMING THE CM921 The Built-in Heating Program ............................................ 5 15 Reviewing the Heating Program ....................................... 5 Modifying the Heating Program ............
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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. To install the Batteries: a. Lift up the front cover of the thermostat to reveal the battery cover and product controls. b. Remove the battery cover by pressing down a
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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 lashing. b. Use the or buttons to set the correct day. When either of these buttons are pressed ‘DAY OK?’ will be displayed. Once the correct day is reached, press the green button to conirm. c. Now the month digits will start lashing and ‘SET THE MONTH’ will be displayed. Change the month and then the y
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The Built-in Heating Program The built-in heating program has 6 temperature level changes that can be set between 3.00am and 2.50am - 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. The factory default program for heating is as follows: Period 1 2 3 4 5 6 Time 6:30 8:00 12:00 14:00 18:00 22:30 Temperature 21°C 18°C 21°C 18°C 21°C 16°C Reviewing the Heating Program To review or edit the
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b. To adjust the period start time press the or buttons and ‘TIME 1 OK?’ will be displayed. Holding the button down will change the time quickly. Note: If you are pressing the or buttons and the display flashes the next change period, it means the next change will be pushed forward if you continue to press or buttons). c. Press the green button to conirm the setting. ‘CHANGES SAVED’ is displayed for 1.5 seconds then ‘SET TEMP 1’ will be shown. Note: If the original time setting
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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: To disable time periods: Go to the desired period ( to ) by moving the slider switch to the PROG position, then using the and buttons to navigate, ensuring the correct period is highlighted with the lashing square symbol. Press and hold the button f
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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. • AUTO (automatic) mode Automatic mode sets the thermostat to follow the temperature program (default or personalised). Operating the thermostat in this mode is the best way to maintain a high level of temperature comfort whilst
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• Temperature Override During normal operation (AUTO mode) the programmed temperature can be adjusted manually by pressing the or buttons. The ‘target‘ temperature will be displayed and lash for 5 seconds – during this time the or buttons can be used to modify the set value. Note: This temperature override is cancelled at the next programmed temperature change. Using the Special Functions • HOLIDAY Function The holiday function allows you to set a constant temperature (default = 10
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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. To change any of these user’s parameters: a. Move the slider switch to the OFF position, then press and hold the button for approximately 5 seconds. button for approximately 5 seconds. OFF
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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 or buttons to select the preferred time format (12=AM/PM format, 24=24hr format) and the display will lash, indicating a change has been made. To conirm this change press the green button. ii) Reset the built-in program to the factory default Press the time button once. The display will show ‘RESET PROGRAM’. Press the
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Troubleshooting Guide Symptom Possible Cause Remedy The thermostat has a blank LCD Batteries not installed. Check to see if there are batteries in the battery screen. compartment and the paper tab has been removed. Incorrect battery orientation. Check that the batteries have been installed in the correctorientation. Exhausted batteries. Replace with new batteries. The thermostat shows a lashing Batteries are exhausted and Replace with new batteries. symbol on the LCD screen. need replacing.
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Symptom Possible Cause Remedy The thermostat’s LCD display No power to heating system. Check that there is power to the heating system. works but the heating does not switch on (HC60NG LEDs are off Program does not call for Move the slider switch to MAN and press or to or green one is on). heat. increase the temperature a few degrees above the current room temperature. The heating should come on after a few seconds. Wrong electrical connection. Call electrical installer to check the boil
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How do I change the batteries on the CM921 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 lashing symbol will be displayed on the screen. To change the batteries follow the steps in the above section (‘STEP 1: Installing the Batteries’ on page 3), replacing the used batteries with new ones in step c. Note: While changing the batteries your program settings will be
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How do I remove the thermostat from the table stand or wall bracket? After programming is inished 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? Green LED indicates normal operation of the radio frequency system. When the green LED is ON the boiler is also ON. When the LED is OFF the boiler is OFF.
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Can I use my CM921 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 the or buttons together for 5 seconds in any of the product operating modes (AUTO, MAN or OFF). The text ‘COOLING’ will be displayed for a moment on the screen to indicate the cooling operation is now active. The factory default program for cooling is speciied in the ta
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...an explanation for householders (The following explanation applies to heating applications only) A programmable room thermostat is both a programmer and a room thermostat. A programmer allows you to set ‘On’ and ‘Off’ time periods to suit your own lifestyle. A room thermostat works by sensing the air temperature, switching on the heating when the air temperature falls below the thermostat setting, and switching it off once this set temperature has been reached. So, a programmable room
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The time on the programmer must be correct. Some types have to be adjusted in spring and autumn at the changes between Greenwich Mean Time and British Summer Time. You may be able to temporarily adjust the heating programme, for example, ‘Override’, ‘Advance’ or ‘Boost’. These are explained in the manufacturer’s instructions. Programmable room thermostats need a free low of air to sense the temperature, so they must not be covered by curtains or blocked by furniture. Nearby electric ires
