The 'SERVICE' indicator is displayed at set intervals as a reminder to
make a routine check of the heating system.
The ‘SERVICE’ indicator will remain on the display of the CM721 until it is
either reset or disabled by your installer. The CM721 and heating system
will continue to operate as normal.
BDR91 relay box fail safe mode setup 11.2
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 in 12.1 Entering the installer set-up mode.
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.
NOTE: To enable the frost protection when RF communication is lost, select the fail-safe mode 1.
Automatic Summer/Winter Time Change 11.3
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 11.4
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 the heating system depending upon how cold
it is. For example, on cold days the 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.
NOTE: When the Optimum Start Feature is used, the time / temperature settings which are entered into the
thermostat should be set to when you want it to be warm and not when you want the heating system to start.
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