The Honeywell CM700 Wireless (CM727 or M721) is a modern wireless programmable room thermostat based on Honeywell’s proven programming philosophy. To further improve the ease of use, this product includes a large LCD display with backlighting to assist customers during daily use.
The CM727/721 room thermostat communicates with the BDR91 relay box on an 868MHz Radio Frequency (RF) band to control a single heating system component such as a boiler, pump, or zone valve. Neither product will communicate with other RF products that use different frequencies or communication protocols.
Note: The RF link between the individual room thermostat (CM727/721) and relay box (BDR91) in system packs provided by Honeywell is preconfigured at the factory and therefore SHOULD be installed at the same site. This makes the installation process fast and easy, but if products from individual system packs are separated, or mixed with other pre-configured system packs during installations please refer to section 5.1 Binding / Rebinding Procedure to bind the desired units together and allow them to communicate with each other.
As these products communicate using RF technology special care must be taken during installation. The location of the RF components, as well as the building structure, may influence the performance of the RF system. To assure system reliability, please review and apply the information given below.
Within a typical residential building, the two products should communicate reliably within a 30m range. It is important to take into consideration that walls and ceilings will reduce the RF signal. The strength of the RF signal reaching the relay box depends on the number of walls and ceilings separating it from the room thermostat, as well as the building construction – the diagram below illustrates an example of typical signal strength reduction. Walls and ceilings reinforced with steel or plasterboard walls lined with metal foil reduce the RF signal significantly more.
Once a position is selected for the room thermostat this can be checked using the RF Communication Test mode as described in section 2.2.3 Locating the Room Thermostat. If the position is unsuitable the relay box will not respond and an alternative position must be selected.
Installing the CM700 Wireless System
Please follow the illustrations and information below in sequence to install the relay box and room thermostat correctly. For applications other than gas boilers, enabling special features and to see what other system options are available refer to section 4) Installer Mode.
Installing the Relay box
The Relay Box is an RF device. For the best performance install in an open space. Leave at least 30cm distance from any metal objects including wall boxes and boiler housing.
Do not mount on metal wall boxes.
EMC compliance considerations
Keep AC mains supply/load cables separate from signal wiring.
Refer to Code of Practice standards EN61000-5-1 and -2 for guidance.
NOTE: The Relay Box contains no user-serviceable parts. It should be opened and installed by a qualified installer only.
WARNING: Electrostatic sensitive device! Do not touch the circuit board.
NOTE: All wiring must be in accordance with IEE regulations
CAUTION: Observe ambient temperature and current limits (see the Relay Box wiring label)
Installing the Room Thermostat
Installing 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 and sliding out.
c. Insert the 2 x AA LR6 Alkaline Batteries supplied with the thermostat, ensuring the correct orientation (see ‘Controls Layout’ on page 2).
d. After a short pause, the thermostat will display information on the screen and is now ready for use.
e. Replace the battery cover by sliding it firmly back into the front of the thermostat.
Setting the Date and Time:
a. Press the DATE button to begin setting the date. When you set the date for the first time after the batteries are inserted, the display will show:
Press the +or –buttons to set the current day of the month (e.g. d 01 = 1st day of the month) then press the green ok button to confirm.
b. Press the +or –buttons to set the current month of the year (e.g. m 01 =January) then press the green ok button to confirm.
c. Press the+ –or buttons to set the current year (e.g. yr 07 = 2007) then press the green ok button to confirm. The date is now stored.
d. Use the +-or buttons to set the correct time then press the green ok button to confirm. Each press of the buttons will change the time by one minute and holding them down will change the time slowly at first and get progressively quicker.
Note: If this mode is entered accidentally then press the AUTO, MAN or OFF buttons to exit.
RF Communication Check (Test Mode)
To check the RF communication, hold the room thermostat about 2-3 meters from the installed relay box. Press the OFF button, then press the and buttons together with the> button for 3 seconds. The
the unit will display ‘TEST TRANSMIT’ and it will send test signals to the relay box, flashing the green LED on every 6 seconds (relay output will remain off) for a maximum of 10 minutes. When the green LED flashes on every 6 seconds proceed to the next step.
NOTE: If the green LED is not switched at specified intervals, the red LED is flashing or if you are installing a replacement relay box or room thermostat, follow the procedures described in section 5.1 Binding / Rebinding Procedure.
Locating the Room Thermostat
While still in the Test Mode, as described in section 2.2.2, the room thermostat should be located taking the following into consideration and reviewing the illustrations below:
- Find a suitable location where the signal transmission is reliable. Reliable transmission is indicated when the relay box is flashing the green LED every 6 seconds. NOTE: The relay box relay will be off.
- Install the room thermostat on the wall using the wall bracket as shown in the diagram below.
- Exit the Test Mode by pressing the AUTO or OFF button.
- The room thermostat should be installed in an open space for best performance as it is a radio frequency device.
- Leave at least 30cm distance from any metal objects including wall boxes and at least 1 meter from any other electrical equipment eg. radio, TV, PC, etc.
- Do not mount onto metal wall boxes.
- It is recommended that the relay box is fully installed.
Now a simple test can be completed to check the full system has been installed correctly:
- Press the OFF button.
- Check the boiler supply is on and check that the green LED on the relay box is off.
- Press the MAN button.
- Adjust the setpoint up to the maximum (35°C) by pressing the button. The boiler should come on (green LED ON on relay box) after a few seconds and the symbol appears on the room thermostat LCD display.
- Press the OFF button. The boiler will go off (green LED OFF on relay box) after a few seconds and the symbol disappears.
- Check the system operation by alternately pressing the MAN and OFF buttons several times, bearing in mind the switching delay referred to above.
Now, you should have completed the installation successfully – to begin operating at the default factory settings press the AUTO button or press PROG to modify the built-in heating program accordingly.
Basic Operation of the System
The relay box receives the heat demand (0100%) signal from the room thermostat. The room thermostat will display the symbol on the LCD display whenever more heat is required. Depending on the demand, the relay box will switch the heating the device on to match the current requirements of the system.
The green LED indicates the status of the relay output:
- Green LED on = relay on
- Green LED off = relay off
Temporary Manual Override
Pressing the relay box button will override the current relay position. As soon as the next signal is received from the room thermostat, the relay box will return back to automatic operation as the automatic control has higher priority than manual operation.
If the RF communication is lost for a period of 1 hour the red LED will illuminate to indicate that no RF messages have been received during the last hour.
The relay box will also enter the failsafe mode as selected in Installer Mode (see section 4.2 BDR91 Relay box Fail-Safe Mode Setup). To allow manual control of the relay box output manual override is available in fail-safe mode. When RF communication is restored the relay box will automatically return to normal operation.
You can now use the USER GUIDE supplied with the room thermostat to demonstrate how it works to the homeowner.
Installer Mode is used to alter the system settings for specific applications, to use the special features of the room thermostat in a different way or to alter the factory preset parameters. Parameters are divided into two groups:
– Category 1 parameters – Room Thermostat Setup
– Category 2 parameters – System Setup.
These are all listed in section 4.5 Installer Parameters Table.
Entering the Installer Mode
- Press the OFF button.
- Press and hold the button and the two PROGRAM< and >buttons together.
- The unit will display the first parameter of installer parameter group category 1 (from Parameter No. 1 to 20).
- Press the or button to change the factory setting. The display will flash indicating that a change has been made.
- Press the green ok button to confirm the change. The display will stop flashing.
- Press the+ button to go to the next parameter.
- Press the PROGRAM> button to go to Installer parameter group category 2 (from Parameter No. 1 to 5).
- To exit installer mode, press the AUTO, MAN, or OFF button.
BDR91 Relay box Fail-Safe Mode Setup
The failsafe mode defines the relay box output relay status if the RF communication is lost (e.g. when
the room thermostat stops communicating due to discharged batteries). The factory setting keeps the
relay permanently off when communications is lost. If this factory setting needs to be changed follow the
- Enter Installer mode as described above.
- Press the >button to enter category 2 parameters.
- Select the parameter 7:LC by pressing the+ button.
- Select the fail-safe mode by pressing or buttons:
• 0 – when RF communication is lost the relay will be held in OFF position.
• 1 – when RF communication is lost the relay output will cycle at 20% to 80% off.
- Press the green ok button to accept the change.
- Attach the appropriate label to the relay box to indicate the selected fail-safe mode.
IMPORTANT: To enable frost protection when RF communication is lost, select the fail-safe mode 1. For systems with separate frost protection thermostat or where frost protection is not required select fail-safe mode 0.
Using the Room Thermostat for Specific Applications
The CM727/721 RF room thermostat is a versatile controller that can be used to control many different applications. For most typical applications, like wall-hung gas-fired combination boiler control or zone valve control, no adjustments from the factory settings are required. For other applications, like controlling an oil burner, the best system performance can be achieved by modifying selected parameters of the room thermostat in the Installer mode. The table below lists the most common settings used for specific
|Specific Application:||Setting:||What to change:|
|Note: All parameters listed below belong to category 2 – System Parameters (see Installer Parameters Table)|
|HEATING||Gas Boiler (<30kW)||6||1||No changes required|
|Oil Boiler||3||4||Set 1:0t parameter to 4|
Set 2:Cr parameter to 3
|Thermal Actuator||12||1||Set 2:Cr parameter to 12|
|Zone Valve||6||1 _||No changes required|
Using the Special Features of the Room Thermostat
|Optimization (Variable Start Time)||The thermostat will adjust the start time in the morning/afternoon so the desired temperature is reached by the start of the program period. The system will restrict the start time to a max of 2 hours.||To enable: Set parameter 8:0P (category 1) to 1.|
|Scheduled Maintenance Alert Period||If the installation requires scheduled maintenance and the user needs to be reminded that the service is due the parameter value can be set to the required number of months (1-48). When the preset period expires the CM721/CM727 will display the ‘SERVICE’ icon.||Set parameter 19:SP to the required value to enable maintenance alert. The value set to zero disables the function.|
|Summer/Winter Auto time change||This feature moves time automatically on the last Sunday of March and the last Sunday of October. The feature is factory-enabled.||To enable: Set parameter 3:tC (category 1) to 1.|
|Temperature Offset||If the thermostat is located in a particularly hot/cold location for reliable signal transmission reasons then the measured/ displayed temperature can be adjusted by +/- 3°C. This is useful if the homeowner wants the reading to match another appliance temperature display.||Set parameter 12:|
tO (category 1) to the required offset value.
|Upper/Lower Temperature Limit||The normal upper-temperature limit of 35°C can be reduced to 21°C to save the homeowner energy. The normal lower limit of 5°C can be increased up to 21°C to protect inhabitants from cold.||Set parameter 6:uL (category 1) to the desired upper limit.|
Set parameter 7:LL (category 1) to the desired lower limit.
Installer Parameters Table
Category 1 – Room Thermostat Settings
|Factory Default Setting||Optional Setting|
|Category I Parameters – Room Thermostat Settings|
|AM-PM / 24hr Display||1:CL||12||12 hr – AM/PM clock display format||24||24 hr clock display format|
|Reset Time/ Temp Program||2:rP||1||Time / Temp profile set to factory default|
Changes to 0 when one of the time/temp profiles are changed
|0||Time / Temperature are as programmed|
To restore the factory profile set to 1
|Auto Summer/ Winter Time Change||3:tC||1||Auto Summer/Winter Time Change|
|0||Auto SummerNVinter Time Change Disabled|
|LCD Backlighting||5:bL||1||Backlighting Enable||0||Backlighting Disabled|
|Upper Temp Limit||6:uL||35||35°C Upper Temp. Limit||21 to|
|21°C to 34°C adjustments in 1°C steps|
|Lower Temp Limit||7:LL||5||5°C Lower Temp. Limit||5 to 21||6°C to 21°C adjustments in 1°C steps|
|Optimization||8:0P||0||Optimization Disabled||1||Optimisation Enabled|
|Temperature Offset||12:t0||0||No temperature offset||-3 to|
|-3°C to +3°C adjustment in 0.1°C steps|
|Proportional Band Width||13:Pb||2.||Proportional band of 1.5 degrees||1.6 to|
|1.6°C to 3.0°C adjustment in 0.1°C steps|
|Scheduled Maintenance Alert Period (months)||19:SP||0||Scheduled Maintenance Alert Period disabled||0 to 48||0 to 48 months adjustment in 1-month steps|
|Reset Parameters to Factory|
|20:FS||1||All settings at factory default Changes to 0 when one of the parameters is changed||0||Settings are as modified above|
To restore the factory profile set to 1
1) Remember to always press the green ok button to confirm that you want to store your new Installer SetUp setting. To exit the Installer Mode Press the AUTO or MAN button.
Category 2 – System Settings
|Factory Default Setting||Optional Setting|
|Category 2 Parameters – System Settings (press the r) button to access this category)|
|Minimum boiler ON time||1:0t||1||1 minute minimum ON time||2 to 5||Selection of 2, 3, 4 or 5 minutes minimum ON time|
|Cycle Rate||2:Cr||6||6 cycles per hour (cph)||3,9 or|
|Selection of 3, 9 or 12 cph|
|Pump Exercise||5:PE||0||Pump exercise disabled||1||Pump exercise enabled|
|System Synchronisation||6:Sn||0||Standard operation of the Room Unit||1||Room unit configured as Synchroniser|
|Loss of Communications Instruction||7:LC||0||Relay Off||1||Relay 20% on / 80% off|
1) Remember to always press the green ok button to confirm that you want to store your new Installer SetUp setting. To exit the Installer Mode press the AUTO or MAN button.
Additional Installation Information
Binding / Rebinding Procedure
The binding operation described below is required if:
• Any of the system components (room thermostat or relay box) are replaced.
• The relay box has incorrect or no binding data stored (e.g. when pre-bound system pack components have been mismatched).
NOTE: During the binding procedure keep approximately 1m distance between the room thermostat and the relay box.
- Press and hold the relay box push-button for 15 seconds to reset any previously stored data. After 15 seconds the red LED will change to flashing 0.1sec on/0.9sec off.
NOTE: After 5 seconds the red LED will start to flash 0.5sec on/0.5sec off, but continue to hold the button).
- Release the push button.
- Press and hold the relay box push-button for 5 seconds to enter the binding mode. The Red LED will start flashing at 0.5sec on/0.5sec off to confirm the binding mode has been entered.
- Press the OFF button on the room thermostat. Then press the and buttons together along with the <button. The unit will display InSt and ‘CONTROL BINDING’.
- Press the green ok button to send the binding signal out to the relay box. The red LED is switched off to confirm the successful binding operation. If the red LED still flashes push the button again until the binding is successful.
- Now go to Section 2) Installing the CM700 Wireless System to set up the system.
Trouble Shooting Guide
|Symptom (Fault Message)The room thermostat|
displays the symbol but the relay box relay does not switch on.
|This is a normal operation. The relay box cycles the relay on and off for times proportional to the demand signal (0-100%) from the room|
thermostat. The symbol only indicates that the demand value is greater than 0%.
|Using the button change the temperature setpoint by a few degrees. The relay box should switch the relay on after a few seconds delay.|
|The relay box does not react to setpoint changes on the room thermostat.||The room thermostat and relay box are not bound.||Reset the relay box by pressing and holding the push button for 15 seconds. Then follow the binding/rebinding procedure as described in section 5) Additional installation Information.|
|After the binding procedure, the red LED is on and the green one is flashing once every 3 sec on the relay box.||Incorrect or incomplete binding procedure.|
Incorrect position of the room thermostat during binding.
|Repeat the binding procedure.|
Repeat the binding procedure keeping approx. 1 m distance between the relay box and the room thermostat.
|The red LED on the relay box is illuminated (Communication loss)||The relay box receives no RF messages from the room thermostat:|
RF signal is blocked due to the wrong location of the room thermostat.
Room thermostat batteries are exhausted.
|Re-locate the room thermostat following instructions in section 2) Installing the CM700 Wireless System.|
Replace batteries in the room thermostat.
The CM727/721 room thermostat has a user-accessible mode that provides information useful to a remote service person and a means of checking whether the boiler is working. To access this press the OFF button, then press and hold the button for 5 seconds. The room thermostat will enter the user settings mode. Next press and hold the and buttons +together. The room thermostat will hold the relay for fo 5 minutes and the following information can be viewed on the display by pressing the or button. : model ID, date code (WW/YY) & checksum.
Hereby, Honeywell declares that this CM727/CM721 room thermostat and BDR91 Relay Box are in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC, 2006/95/EC, and 2004/108/EC.
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, ACS-ECC
EMEA, Z.A. La Pièce 16, 1180 Rolle, Switzerland by its Authorised Representative Honeywell International Inc.
Honeywell Control Systems Ltd.
Arlington Business Park,
Technical Help Desk: 08457 678999
© 2009 Honeywell International Inc.
Documents / Resources
|Honeywell CM700 Wireless Programmable Room Thermostat and BDR91 Relay Box [pdf] User Guide|
CM700, Wireless Programmable Room Thermostat and BDR91 Relay Box