Honeywell CM900 Manual De Usuario

50039987-003 A
© 2009 Honeywell International Inc.

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

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 
CM900 Wireless System

.

Replace batteries in the room thermostat.

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.

®