MAN1544-5
43
6.6.3
Manual Activation
It shall be possible to instigate a manual release whilst the module is in the auto mode.
A manual release is initiated by operating the manual release control at the ARC or the LCS.
If an automatic release sequence has not started, then the manual release sequence proceeds as detailed
in previously. Note that the LCS inhibit control WILL NOT abort the manual release sequence.
If an automatic release sequence has started, then the manual release will interrupt the automatic release
and take over the remainder of the sequence. The following tables outline the operation.
Single Zone Activation
Current Step in Activation Sequence
Manual Activation
1, 2, 3
Extinguish automatic activation LED and commence
manual activation steps 1 thru 8
4, 5
Extinguish automatic activation LED, light the manual
activation LED, instigate 5 second delay, resume at step 6
6,7
No effect
Dual Zone Activation
Current Step in Activation Sequence
Manual Activation
1, 2, 3, 4, 5
Extinguish automatic activation LED and commence
manual activation steps 1 thru 8
6,7
Extinguish automatic activation LED, light the manual
activation LED, instigate 5 second delay, resume at step 6
8,9
No effect
6.7
Service Switch
This optional input is used to bring a fault into the system from an external source. Requirements for the
input are an open collector or 0 volt, voltage free contact to initiate a fault. Connection is to TB3 COM & 3
6.8
Lock-Off Valve
The service switch is situated at the ARC, and when activated causes the following
➢
Electrically isolates the activation circuitry from the agent release device
➢
Operates the System Inoperative output.
➢
The service switch is not overridden
➢
Activates an isolate condition at the FACP, For AS4428, the FACP activates the brigade isolate
output, illuminates the isolate indicator and, reports the condition to the LCD. For AS7240, the
FACP activates the isolate relay on the brigade board (if fitted), illuminates the disable indicator and
reports the condition to the LCD and the buzzer shall sound after 8 hours.
A manual or automatic release sequence is prevented from starting if the service switch has been operated
prior to the sequence commencing, and the sequence is aborted if the service switch is operated during the
sequence.
If the agent release module is in the manual mode, then the service switch is activated, and then the
service switch is de-activated, the agent release module will default to the automatic mode.
