Adjustments; Dip Switch Configuration Setting; Selectable Delay Settings (Switches 3 & 4) - Chamberlain LM21AFCB Owner's Manual

Advance fire control release device
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DIP SWITCH CONFIGURATION SETTING

The release device has DIP switch selectable options. The options
DIP switch is located next to terminal block 5. Set all DIP switch
options before applying power to the system. The selection of
positions is listed below.
DIP Switch
1
Motorized door. The device will attempt to close the door with
the motor before releasing.
2
Stop on obstruction. If a motorized door is used, the device
will attempt to close the door but will reverse if the safety
edge is triggered. The device will stop the door on the
obstruction when it is sensed the third time.
3
DIP switches 3 and 4 control the length of the delay, either 10,
20, 30 or 60 seconds depending on the switch settings.
4
DIP switches 3 and 4 control the length of the delay, either 10,
20, 30 or 60 seconds depending on the switch settings.
5
6-Minute safety timer. Will drop the door after 6 minutes if the
close limit is not achieved by a motorized closure.
6
Line Power Loss Alarm. Treat a loss of line power as an alarm,
which leads to door closure or drop.
7
Auto-Open. Open a motorized door automatically after alarm
condition is cleared by Remote Test / Reset Switch.
8
For voice board option only, this selects Message 1.
SELECTABLE DELAY SETTINGS (SWITCHES 3 & 4)
The release device will provide a factory default delay of 10
seconds before releasing the fusible link chain upon alarm. The
length of the delay is controlled by the positions (Off or On) of
the number 3 and 4 switches on the 8-position DIP switch
mounted on the logic board. Four preset delays are available and
are shown.
A D J U S T M E N T S
Switch "ON"
ON
1
2
3
Factory default setting of 10 seconds shown.
Manual door. The device will drop the door without attempting
to close it with a motor.
Drop after sensing an obstruction three times. The device will
attempt to close the door but will reverse if the safety edge is
triggered. The device will fully open the door after a third
obstruction is sensed and then drop the door.
DIP switches 3 and 4 control the length of the delay, either 10,
20, 30 or 60 seconds depending on the switch settings.
DIP switches 3 and 4 control the length of the delay, either 10,
20, 30 or 60 seconds depending on the switch settings.
3-Minute safety timer. Will drop the door after 3 minutes if the
close limit is not achieved by a motorized closure
Operate normally from battery power when line power is lost.
(Standard)
Auto-Open Disabled. Keep door closed after alarm condition is
cleared. (Standard)
For voice board option only, this selects Message 2.
Delay Setting
10 Seconds
20 Seconds
30 Seconds
60 Seconds
9
4
5
6
7
8
Switch "OFF"
Switch Position
3
Off
Off
Off
On
On
Off
On
On
4

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