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Installation Guide

11

6) Trouble Shooting

6.1 Trouble Shooting Guide

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 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 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.

6.2 Diagnostic Mode  

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 on for 

5 minutes and the following information can be viewed on the display by pressing the     or   button. : 

model ID, date code (WW/YY) & checksum.

Содержание CM721

Страница 1: ...roducts 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 Table of Contents Section Page 1 Installation Information 2 2 Installing the CM700 Wireless System 3 2 1 Installing the Relay box 3 2 2 Install...

Страница 2: ... 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...

Страница 3: ...iance 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 qualified installer only WARNING Electrostatic sensi tive device Do not touch the circuit board NOTE All wiring must be in accordance with IEE regulations CAUTI...

Страница 4: ...the green button to confirm c Press the or buttons to set the current year e g yr 07 2007 then press the green button to confirm The date is now stored d Use the or buttons to set the correct time then press the green 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 m...

Страница 5: ...djust 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 Press the OFF button 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 alternately pressing the MAN and OFF buttons several t...

Страница 6: ...iod 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 automat...

Страница 7: ...o indicate the selected fail safe mode IMPORTANT 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 1 Press the OFF button 2 Press and hold the button and the two PROGRAM and buttons together 3 The unit will display the first parameter of ins...

Страница 8: ...e preset period expires the CM721 CM727 will display the SERVICE icon Set parameter 19 SP to the required value to enable maintenance alert 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 Offs...

Страница 9: ...1 Auto Summer Winter Time Change Enabled 0 Auto Summer Winter 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 34 21 C to 34 C adjustment in 1 C steps Lower Temp Limit 7 LL 5 5 C Lower Temp Limit 5 to 21 6 C to 21 C adjustment in 1 C steps Optimisation 8 OP 0 Optimisation Disabled 1 Optimisation Enabled Te...

Страница 10: ...tton on the room thermostat Then 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 Section 2 Installing the CM700 Wire...

Страница 11: ...correct 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...

Страница 12: ...and 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 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 a...

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