FSS Pressure Switch
The pressure switch monitors the pressure in the heat
detection tube. When the tube bursts, the pressure in
the tube will drop. This triggers the pressure switch,
which will then send signal to the PLC to let the PLC
know that the fire suppression agent has been released.
The fire suppression agent can also be actuated
electrically, when the fire pull is triggered, or when either
the primary or secondary heat detector detects heat
before the heat detection tubing melts.
Louvers
The louvers are located on top of the unit on the
intake and exhaust. They are pneumatically
controlled using solenoid valves. Activation of the
valve opens the louvers, deactivation closes. There
are indicator lights on the DIN connectors for the
valves to show if power is present or not.
The louvers are opened and shut using a pneumatic
cylinder. The cylinder has a spring extension so that
the loss of power will force the louvers shut. Check
valves are in place so that if compressed air is lost or
low, the louvers will not shut blocking air flow to the
unit. Compressed air is not required to close the louvers, only to open them due to the spring extension.
The door is sealed using bubble gasket. The seal is only to block air flow, and is not necessarily a 100%
seal.
The louvers close to prevent airflow when the fire suppression system is activated. On multi-module units,
louvers are used for each intake and exhaust.
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