Honeywell CM721 Programmable Room Thermostat User Guide
‘Using the Features’
OPERATING THE CM721
•
Automatic Summer/Winter Time Change
The CM721 has a built-in Automatic Summer/Winter Time Change feature that will automatically
adjust the clock forward or backward by one hour for ‘Daylight Saving Time’. This is carried out
on the last Sunday of March and October each year.
•
Optimum Start
Optimum Start is a program which ensures that the optimum temperature conditions are
achieved at the required times. This is an Energy Efficiency feature that adjusts the start time
of your heating system depending upon how cold it is. For example, on cold days your heating
system will be started earlier to ensure that your home is warm when you get up (at the target
temperature) and on warmer days the heating system will be started later to save energy. So,
if the Optimum Start Feature is used, then the time / temperature settings which are entered
into the thermostat should be set to when you want to be warm by and not when you want the
heating system to start.
FAQ’s
How do I change the batteries on the
thermostat when they run out?
BDR91 Relay Box Controls Layout
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).
6
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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