Honeywell CM721 Programmable Room Thermostat User Guide
FAQ’s
BDR91 Relay Box Controls Layout
How do I change the batteries on the
thermostat when they run out?
The relay box will normally be found mounted
close to the boiler.
The thermostat constantly monitors the battery
power level, which typically lasts for about
years before needing replaced. When the power
is running low flashing symbol will be
2
a
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 settings to be correct.
Push button
and relay
status LED’s
What does it mean when the BDR91
relay box green LED is ON?
How do I set one temperature for the
whole day?
The 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.
To operate as a simple thermostat with one
temperature throughout the day, select the
manual operating mode by pressing the
MAN button. Adjust the 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.
When do I need to use the push
button?
You should use the push button to control your
boiler only when the RF communication is lost
(see the Troubleshooting Guide).
This product and its associated documentation and packaging are protected by various
intellectual property rights belonging to Honeywell Inc. and its subsidiaries and existing under
the laws of the UK and other countries. These intellectual and property rights may include patent
applications, registered designs, unregistered designs, registered trade marks, unregistered
trade marks and copyrights.
Honeywell reserves the right to modify this document, product and functionality without notice.
This document replaces any previously issued instructions and is only applicable to the
product(s) described.
This product has been designed for applications as described within this document. For use
outside of the scope as described herein, refer to Honeywell for guidance. Honeywell cannot be
held responsible for misapplication of the product(s) described within this document.
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 Inc.
14
firealarmresources.com
| General | Details |
|---|---|
| Name | Honeywell CM721 Programmable Room Thermostat User Guide |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.26 MB |
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