Entering Installer Mode; Bdr91 Relay Box Fail-Safe Mode Setup - Honeywell CM727 Installation Manual

4.1 Entering the Installer Mode
1. Press the OFF button.
2. Press and hold the
PROGRAM and
3. The unit will display the first parameter of installer
parameter group category 1 (from Parameter
No. 1 to 20).
4. Press the or button to change the factory
setting. The display will flash indicating that a
change has been made.
5. Press the green
change. The display will stop flashing.
6. Press the button to go to the next
parameter.
7. Press the PROGRAM
parameter group category 2 (from Parameter No.
1 to 5).
8. To exit installer mode, press the AUTO, MAN or
OFF button.

4.2 BDR91 Relay box Fail-Safe Mode Setup

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 above.
2. Press the button to enter category 2 parameters.
3. Select the parameter 7:LC by pressing the
4. Select the fail-safe mode by pressing
• 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.
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.
Installation Guide
button and the two
buttons together.
button to confirm the
button to go to Installer
or buttons:
1 2 3
DATE/
DAY
COPY
DAY
PROGRAM
1 2 3
DATE/
DAY
COPY
DAY
1 2
PROGRAM
button.
4 5 6 7
MANAUTO
AUTO
MAN
1
OFF
1..4
4 5 6 7
AUTO
MAN
2
OFF
1..4
2
7