Honeywell CM900, CM927, CM921 Wireless Room Thermostat Installation Guide

Description

The Honeywell CM900 Wireless (CM927 or CM921) is a modern wireless programmable room thermostat based on Honeywell's proven programming philosophy. To further improve the ease of use, this product includes an extra large LCD display with backlighting and LoT Technology to assist customers during daily use.

The CM927/921 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 (CM927/921) 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 the "Binding / Rebinding Procedure" section to bind the desired units together and allow them to communicate with each other.

Installation Information

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 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 the "Locating the Room Thermostat" section. If the position is unsuitable the Relay Box will not respond and an alternative position must be selected.

Typical example of Building Fabric Signal losses

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.

To bind/rebind:

1. 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).
2. Release the push button.
3. 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.
4. Move the room thermostat slider to the OFF position and press the and buttons together along with the button. The unit will display InSt and 'CONTROL BINDING'.
5. Press the green button to send the binding signal out to the Relay Box. The red LED is switched off to confirm successful binding operation. If the red LED still flashes push the button again until binding is successful.
6. Now go to the "Installing the CM900 Wireless System" Section to setup the system.

Multi-Zone System

Multiple room thermostats and Relay Box sets can also be used to control multi-zone systems and the CM927/921 room thermostat is compatible with a variety of other Honeywell products including HR80 radiator controllers (see below) and HCE80 underfloor heating controllers. If you intend to use it in this way additional installation and user instructions can be obtained by contacting the address at the end of this guide.

NOTE: Some of the labels supplied with the pack are for use in multi-zone applications.

Binding an HR80 Radiator Controller to the Room Thermostat

1. Press the bind button (1) for approximately one second and release. When the button is released, the symbol flashes and the software version number is displayed for 30 seconds.1
   
2. Move the room thermostat slider to the OFF position and press the and buttons together along with the button. The unit will display InSt and 'CONTROL BINDING'.
3. Press the green button to send the binding signal out to the radiator controller.
4. The radiator controller will display once the signal has been received.

If several radiator controllers are to be controlled simultaneously in one room:

1. Press the bind button on all the radiator controllers to be bound to the room thermostat. The symbol flashes continuously on the display of the radiator controller.
2. Move the room thermostat slider to the OFF position and press the and buttons together along with the button. The unit will display InSt and 'CONTROL BINDING'.
3. Press the green button to send the binding signal out to the radiator controllers.
4. The radiator controllers will display once the signal has been received. The set temperature at the radiator controller is automatically set to 20°C.

NOTE: The radiator controller can take up to 4 minutes to receive data from the room thermostat.

Installation

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 the "Installer Mode" section.

Installing the Relay Box

1. The Relay Box is a 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.
2. 
   NOTE: The Relay Box contains no user serviceable parts. It should be opened and installed by qualified installer only.
   
   Electrostatic sensitive device! Do not touch the circuit board.
4. 
   NOTE: All wiring must be in accordance with IEE regulations
   
   Observe ambient temperature and current limits
   (see the Relay Box wiring label)

Installing the Room Thermostat

Power Up

1. Remove the battery cover and insert the batteries supplied with the room thermostat (2 x AA LR6 Alkaline Batteries).
2. On the initial power up the available user interface languages will be displayed (only on certain models).
   Use the or buttons to cycle through the options until the desired language is displayed. Press the green button to confirm the selection.
3. Set the slider switch to the DATE mode.
4. Use the or buttons to set the correct day / month / year, pressing the green button to confirm.
5. Use the or buttons to set the correct time, pressing the green button to confirm.

Install the batteries (included) and attach the instruction label to flap

RF Communication Check (Test Mode)

To check the RF communication, hold the room thermostat about 2-3 metres from the installed Relay Box. Move the slider on the room thermostat to the OFF position then press the and buttons together with the button for 3 seconds. 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 the "Binding / Rebinding Procedure" section.

Locating the Room Thermostat

While still in the Test Mode, as described in section above, the room thermostat should be located taking the following into consideration and reviewing the illustrations below:

1. 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.
   
2. Install the room thermostat EITHER on the wall using the wall bracket OR attach the optional table stand as shown in below.
   
3. Exit the Test Mode by moving the setting slider to the required operating mode (AUTO or OFF).

• 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 metre 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.

System Check

Now a simple test can be completed to check the full system has been installed correctly:

1. Set the slider switch to the OFF mode.
2. Check the boiler supply is on and check that the green LED on the Relay Box is off.
3. Set the slider switch to the MAN mode.
4. 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.
5. Set the slider switch to the OFF mode. The boiler will go off (green LED OFF on Relay Box) after a few seconds and the symbol disappears.
6. Check the system operation by moving the slider between MAN and OFF modes 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 move the slider to the AUTO mode or select PROG to modify the built-in heating program accordingly.

Basic Operation of the System

Automatic Operation

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 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.

Communications Loss

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 home owner.

Installer Mode

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 the "Installer Parameters Table" section.

Entering Installer Mode

1. Move the slider switch to the OFF mode.
   Press and hold the button and the two & buttons together.
   
2. The unit will display the first parameter of installer parameter group category 1 (from Parameter n.1 to n.19) as shown
   
3. Press the or to change factory setting.
   The display will flash indicating that a change has been made.
   
4. Press the green button to confirm the change.
   The display will stop flashing.
   
5. Press button to go to the next parameter.
   
6. Press button to go to Installer parameter group category 2 ( ) (from Parameter n.1 to n.14).
7. To exit the installer mode, move the slider switch to the AUTO or MAN positions.

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 instructions below:

1. Enter Installer mode as described above.
2. Press the button to enter category 2 parameters.
3. Select the parameter 7:LC by pressing the button.
4. 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% on 80% off.

5. Press the green button to accept the change.
6. Attach appropriate label to the Relay Box to indicate the selected fail-safe mode.

To enable the 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 CM927/921 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 applications.

Specific Application:		Setting:		What to change:
		Cycle/ Hour	Minimum ON Time	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:Ot 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
AIR-CONDITIONING				To enable switching between cooling and heating modes adjust parameter 4:HC in category 2 (0 = disabled, 1 = enabled). Now you can switch between these modes by pressing the and buttons together for 5 seconds in any of the product operating modes (AUTO, MAN or OFF). Explain to the end user how to switch between these modes using the and buttons and ensure the cooling program is modified as required.
	Heat Pump / AirConditioner	3	4	Set 1:Ot parameter to 4 Set 2:Cr parameter to 3
	Fan Coil	6	1	No changes required

Using the Special Features of the Room Thermostat

Installer Parameters Table

Category 1 - Room Thermostat Settings

Notes

1. Remember to always press the green button to confirm that you want to store your new Installer Set-Up setting. To exit the Installer Mode move the slider switch to the AUTO or MAN position.

Category 2 - System Settings

Parameter	Parameter No.	Factory Default Setting		Optional Setting
Category 2 Parameters – System Settings (press the button to access this category)
		Display	Description	Display	Description
Minimum boiler ON time	1:Ot	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 12	Selection of 3, 9 or 12 cph
Heat/Cool Change	4:HC	0	Disabled	1	Enabled
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
The following Parameters are for the control of other Honeywell Wireless products such as Wireless Underfloor Heating controls and Wireless Radiator controls. For more information please contact Honeywell sales.
Room Temperature Sensor Use	8:Su	0	BDR91 control	1,2,3 or 4	HR80/HM80 control with own/remote sensor (no temperature displayed) HR80/HM80/HCE80 control with CM sensor BDR91 control and HR80/HM80/HCE80 control with own/remote sensor Hr80/HM80/HCE80 control with own/ remote sensor (temperature displayed)
HR80 WindowOpen Function	9:HO	0	Disabled	1	Enabled
HR80 Local Override	10:HL	1	Enabled	0	Disabled
Maximum Flow Setpoint	11:uF	55	55°C Maximum Flow Temp.	0 to 99	0°C to 99°C adjustment in 1°C steps
Minimum Flow Setpoint	12:LF	15	15°C Minimum Flow Temp.	0 to 50	0°C to 50°C adjustment in 1°C steps
Mixing Value Run Time	13:Ar	150	150 seconds	0 to 240	0 to 240 sec. adjustment in 1sec steps
Pump Overrun Run Time	14:Pr	15	15 minutes	0 to 99	0 to 99 mins adjustment in 1min steps

Notes

1. Remember to always press the green button to confirm that you want to store your new Installer Set-Up setting. To exit the Installer Mode move the slider switch to the AUTO or MAN position.
2. These parameters are set centrally for the zoning system at the room thermostat configured as the system synchroniser.
3. Minimum on-time setting applies only to the boiler controller. All Relay Box zone controllers will work with the minimum on-time of 30 seconds.

Trouble Shooting

Symptom (Fault Message)	Possible Cause	Remedy
The room thermostat displays the symbol but the Relay Box relay does not switch on.	This is 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 the "Additional Installation Information" section.
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 wrong location of the room thermostat. Room thermostat batteries are exhausted.	Re-locate the room thermostat following instructions in the "Installing the CM900 Wireless System." section Replace batteries in the room thermostat.

Diagnostic Mode

The CM927/921 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 move the slider switch to the OFF position 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 on for 5 minutes and the following information can be viewed on the display by pressing the or buttons. : model ID, date code (WW/YY) & checksum.

Hereby, Honeywell declares that this CM927/CM921 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,
Bracknell, Berkshire
RG12 1EB
Technical Help Desk: 08457 678999
www.honeywelluk.com

© 2009 Honeywell International Inc.

Documents / Resources

Download manual

Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.

Download Honeywell CM900, CM927, CM921 Wireless Room Thermostat Installation Guide