CM721..................................2-6 CM727................................
CM721 - USER GUIDE Description Features The Honeywell CM721 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 thermostat to provide the most home comfort at the least cost. • Ergonomic user interface featuring an ‘OK-button’. • Large LCD (Liquid Crystal Display) Screen.
SETTING-UP THE CM721 ‘Getting Started’ 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 room temperature is already displayed 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.
‘Efficient Daily Use’ PROGRAMMING THE CM721 The Built-in Heating Program The built-in heating program has 4 temperature level changes 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. The factory default program for heating is as follows.
‘Using the Features’ OPERATING THE CM721 Choosing the Operating Mode The thermostat can operate in three different modes: Automatic, Manual or Off. To set the operating mode press either of the AUTO, MAN or OFF buttons. The screen indicates which mode is currently active by displaying AUTO, MAN or OFF. • AUTO (automatic) mode sets the thermostat to follow the built-in temperature program (default or personalised).
‘Using the Features’ OPERATING THE CM721 • Automatic Summer/Winter Time Change The CM721 has a built-in Automatic Summer/Winter Time Change feature that will automatically adjust the clock forward or backward by one hour for ‘Daylight Saving Time’. This is carried out on the last Sunday of March and October each year. • Optimum Start Optimum Start is a program which ensures that the optimum temperature conditions are achieved at the required times.
TROUBLESHOOTING THE CM721 Symptom Remedy Blank Display (Power Loss). Check batteries are installed by removing the battery cover. Check batteries have been installed in the correct orientation. Replace the batteries. Display shows flashing symbol. The batteries in the thermostat are low on power - Replace the batteries. Display shows A fault has occurred in your heating system. Remove and re-insert the batteries. symbol. If the symbol does not clear after a few minutes contact your installer.
CM727 - USER GUIDE Description Features The Honeywell CM727 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 thermostat to provide the most home comfort at the least cost. • Ergonomic user interface featuring an ‘OK-button’. • Large LCD (Liquid Crystal Display) Screen.
SETTING-UP THE CM727 ‘Getting Started’ 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 room temperature is already displayed 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.
‘Efficient Daily Use’ PROGRAMMING THE CM727 The Built-in Heating Program The built-in heating program has 4 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. The factory default program for heating is as follows.
PROGRAMMING THE CM727 ‘Efficient Daily Use’ f. i) Press the COPY DAY button to copy Monday’s program into Tuesday. The display will go blank apart from the ‘non flashing’ day indicator, which indicates the day copied and the ‘flashing’ target day to copy the program to. To accept this day press the green button. To select a different target day press the DATE/DAY button until the ‘flashing’ day indicator is under the required day, then accept it by pressing the green button.
‘Using the Features’ OPERATING THE CM727 During Normal Operation • Temperature Enquiry In AUTO, MAN and OFF operating modes the thermostat will display the current room temperature. To review the programmed ‘target’ temperature (the temperature which the thermostat is trying to maintain) press the button. This ‘target’ temperature value will be displayed flashing for 5 seconds before returning to the current room temperature value.
PROGRAMMING THE CM727 ‘Using the Features’ Using the Special Features • SERVICE indicator (optional) Note: This option only works if activated by your installer. The 'SERVICE' indicator is displayed at set intervals as a reminder that your heating system requires a routine check. Please call your installer to arrange a maintenance visit. The ‘SERVICE’ indicator will remain on the display of the CM727 until it is either reset or disabled by your installer.
FAQ’s How do I change the batteries on the thermostat when they run out? The thermostat constantly monitors the battery power level, which typically lasts for about 2 years before needing replaced. When the power is running low a flashing 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.
TROUBLESHOOTING THE CM727 Symptom Remedy Blank Display (Power Loss). Check batteries are installed by removing the battery cover. Check batteries have been installed in the correct orientation. Replace the batteries. Display shows flashing symbol. The batteries in the thermostat are low on power - Replace the batteries. Display shows A fault has occurred in your heating system. Remove and re-insert the batteries. symbol. If the symbol does not clear after a few minutes contact your installer.
® WHAT IS A PROGRAMMABLE ROOM THERMOSTAT? ...an explanation for householders 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.
