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FIREFINDER SERIES II
INSTALLATION,
COMMISSIONING
&
OPERATION
11.13.1
Agent Release Module (BRD25ARB-A)
The Agent Release Module controls and monitors all the requirements for agent release and carries
the slide in label for identification of the agent and application area.
Keyswitch
PCB
Manual Release
Switch
Quiescent
Current:
8mA
Figure 73: Exploded View of Module and Front Panel Layout
Controlled Access
OFF
SERVICE INHIBIT
It is a requirement that control be secured from unauthorised use. A keyswitch
has therefore been included in the control process.
The FCP goes into service mode when the keyswitch is switched to SERVICE INHIBIT. This results
in the selected agent activation circuit being electrically isolated and a Common Isolate condition
being indicated at the FACP. This condition can also confirmed through the Status Menu. To remove
the key it is necessary for the switch to be in the
OFF
position.
AGENT
SELECT
Pressing Select toggles the selection of either the Main or Reserve release agent. Selection
is indicated by the Main and Reserve Agent LED’s
A
G
E
N
T
N
H
I
B
I
T
I
If activated the Manual Release will commence the discharge sequence of the selected
agent and an alarm condition is initiated. Progress of the release can be monitored through the
Status Menu. To prevent accidental operation this switch has a hinged clear plastic cover that has to
be raised to access the switch.
Agent Release Module PCB Layout
Select
Manual
Activation
Lock Off
Valve Inhibit
Agent Low
Pressure
Interlock
Automatic
Activation
Local Control
Panel Inhibit
Trigger Zone
Isolated
Initial Agent
Agent
Discharged
Agent
Circuit Fault
Common
Fault
Reserve
Agent
S W2
CN2
TP9
Key Switch
Address
Switch
RS485
&
+/- 27v
In
RS485
&
+/- 27v
Out
1
2
3
4
ON
K1
Termination
Link
CN8
Manual Release
CN6
CN7
Figure 74: Module PCB Layout Front and Rear
The PCB is fitted with two 2 x RJ45 connectors CN6 & 7 for power (27VDC) and communications
(RS485) for communications between the Agent Release Module and the FACP Main Control Board.
Quiescent Current: 28.5mA
Note:
If the keyswitch is not used CN2 will carry a link so as to enable the panel.