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.
Features
WHAT IS A PROGRAMMABLE ROOM THERMOSTAT?
…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 thermostat lets you choose what times you want the heating to be on, and what temperature it should reach while it is on. It will allow you to select different temperatures in your home at different times of the day (and days of the week) to meet your particular needs.
Turning a programmable room thermostat to a higher setting will not make the room heat up any faster. How quickly the room heats up depends on the design of the heating system, for example, the size of boiler and radiators.
Neither does the setting affect how quickly the room cools down. Turning a programmable room thermostat to a lower setting will result in the room being controlled at a lower temperature, and saves energy.
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. The best way to do this is to set low temperatures first, say 18°C, and then turn them up by one degree each day until you are comfortable with the temperatures. You won’t have to adjust the thermostat further. Any adjustments above these settings will waste energy and cost you more money.
If your heating system is a boiler with radiators, there will usually be only one programmable room thermostat to control the whole house. But you can have different temperatures in individual rooms by installing thermostatic radiator valves (TRVs) on individual radiators. If you don’t have TRVs, you should choose a temperature that is reasonable for the whole house. If you do have TRVs, you can choose a slightly higher setting to make sure that even the coldest room is comfortable, then prevent any overheating in other rooms by adjusting the TRVs.
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 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.
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.
This section shows you how to setup and run the thermostat in 3 simple steps:
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:
PLEASE RESPECT YOUR ENVIRONMENT! Take care to dispose of used batteries carefully.
To set the Date and Time:
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 program has been designed to provide normal comfort requirements, but if you want to customise the default settings (as shown on the next page) please see the next section ‘PROGRAMMING 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. The factory default program for heating is as follows:
Monday to Friday
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 |
Saturday & Sunday
Period | 1 | 2 | 3 | 4 | 5 | 6 |
Time | 8:00 | 10:00 | 12:00 | 14:00 | 18:00 | 23:00 |
Temperature | 21°C | 21°C | 21°C | 21°C | 21°C | 16°C |
Reviewing the Heating Program
To review or edit the heating program move the slider switch to the PROG position then use the
Modifying the Heating Program
To change the heating program:
The thermostat has 6 periods each day 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 ( 2 to 6 ) by moving the slider switch to the PROG position, then using the
To enable time periods:
Navigate to the disabled period by moving the slider switch to the PROG position, then using the
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.
The holiday function allows you to set a constant temperature (default = 10°C) for a specified number of days (from 1 – 99 days). This lets you save energy and related costs when you are away from home, but resumes normal operation on the day of your return.
To set the Holiday function:
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. The thermostat will then return to normal operation as set by the slider switch position (AUTO or MAN position). To cancel the HOLIDAY setting or to exit the function at any time press the
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.
This function can also be used to reduce the temperature when you leave the house for a short period (shopping, visiting friends, etc) thus saving energy and saving you money.
To set the Party function:
The unit will now control to the new temperature for the set number of hours then return to normal operation as set by the slider switch position (AUTO or MAN position). To cancel the PARTY setting or to exit the function at any time press the
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.
To set the Day Off function:
Adjusting the Time
To adjust only the time during normal operation use the
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:
Symptom | Possible Cause | Remedy |
The thermostat has a blank LCD screen. | Batteries not installed. | Check to see if there are batteries in the battery 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 flashing | Batteries are exhausted and need replacing. | Replace with new batteries. |
The thermostat’s LCD display shows a | The heating is not required at this moment. | The heat demand is send to the HC60NG as a value between 0-100%. The HC60NG will adjust the boiler on time to meet this requirement. That is why the heating will be off sometimes even if the |
The thermostat shows a flashing | Fault in thermostat | Remove and re-insert the batteries in the thermostat. If the symbol does not clear itself in a few minutes call the installer. |
Symptom | Possible Cause | Remedy |
The thermostat’s LCD display works but the heating does not switch on (HC60NG LEDs are off or green one is on). | No power to heating system. | Check that there is power to the heating system. |
Program does not call for heat. | Move the slider switch to MAN and press | |
Wrong electrical connection. | Call electrical installer to check the boiler and HC60NG power supply as well as the connection between the boiler and the HC60NG. | |
The red LED on the HC60NG is constantly on or flashing. | RF communication lost due to the wrong location of the thermostat. | Hook the thermostat back on the wall bracket or replace the thermostat on the table stand in the position where RF communication was reliable. |
RF communication fault. | Call installer.
NOTE: You can control the boiler manually when the RF communication is lost: Press the HC60NG push button to switch the boiler on and off. When the green LED is on – the boiler is on. | |
Heating switches ON or OFF too slowly or quickly. | The thermostat not set correctly for your system. | Call Installer. |
Temperature swings between too hot and too cold. | The thermostat not set correctly for your system. | Call Installer. |
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. 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 stored but you may need to adjust the time and date settings to be correct.
How do I set one temperature for the whole day?
To operate as a simple thermostat with one temperature for a period of time, move the slider switch to the MAN position. Adjust the manual temperature by pressing the
or buttons. This can be set anywhere from 5°C to 35°C in 0.5°C steps. The thermostat will continue to maintain this temperature until another operating mode is selected or the temperature is adjusted.
What is Optimum Start?
Optimum Start is a program which ensures that the optimum temperature conditions are achieved at the required times. This is an Energy Efficiency feature that adjusts the start time of your heating system depending upon how cold it is. For example, on cold days your heating system will be started earlier to ensure that your home is warm when you get up (at the target temperature) and on warmer days the heating system will be started later to save energy. So, if the Optimum Start Feature is used, then the time/temperature settings which are entered into the thermostat should be set to when you want to be warm by and not when you want the heating system to start.
I want to use the table stand instead of wall mounted bracket. Where can I position the room unit?
It is important to keep the room unit in a location where reliable RF communication was proven. Advise your installer where would you like to position the room unit and he will check if the RF communication is reliable in the selected location(s).
Important: The Room Unit measures the temperature of the room where it is located. It is important that the placement of the Room Unit within the room is away from; draughts, direct sunlight and other heat sources. As this is a wireless device certain objects could interfere with the RF signal – Leave at least 30cm distance from any metal objects (including wall boxes) and at least 1 metre from any other electrical equipment eg. radio, TV, PC, etc.
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.
HC60NG Relay Box Controls Layout
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.
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 the
Monday to friday
period | 1 | 2 | 3 | 4 | 5 | 6 |
Time | 6:30 | 8:00 | 12:00 | 14:00 | 18:00 | 22:30 |
Temperature | 24°C | 28°C | 24°C | 28°C | 24°C | 24°C |
Saturday & Sunday
period | 1 | 2 | 3 | 4 | 5 | 6 |
Time | 8:00 | 10:00 | 12:00 | 14:00 | 18:00 | 23:00 |
Temperature | 24°C | 24°C | 24°C | 24°C | 24°C | 24°C |
If something happens to my heating system how can I check that the thermostat is working?
Refer to the Troubleshooting Guide on page 17. If you still need assistance after this call your installer. The thermostat should only be opened or removed by a qualified professional to prevent possible injury from electric shock and/or damage to the product.
Download manual:
Honeywell Home CM927 Programmable Thermostat User Guide
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Honeywell Home CM927 Programmable Thermostat Product Specification Sheet
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