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The trained personnel who monitor other fire and
building systems can also be trained for smoke control
system monitoring and operation. The building's main
control or security center could also serve as the location
of the FSCS, if acceptable to the AHJ.
Firefighter's smoke control station
The FSCS, where required, is located according to
direction from the AHJ. The FSCS must provide full
monitoring and manual control capability over all smoke
control system functions including a graphic annunciator
panel.
The FSCS should be designed to have the highest
priority control over all smoke control systems and
equipment. Where manual controls are also provided at
other building locations (such as the main
control/security center) for use of smoke control
systems, the control mode selected from the FSCS
should prevail. The design of the FSCS must be such
that control actions from this point will override or bypass
other building controls such as Hand-Off-Auto and
Start/Stop switches located on fan motor controllers,
freeze detection devices, and duct smoke detectors.
FSCS controls should not override or bypass devices
and controls intended to protect against electrical
overloads, provide for personnel safety, or prevent major
system damage. These include overcurrent protection
devices, electrical disconnect switches, high-limit static
pressure switches, and combination fire/smoke dampers
beyond their degradation temperature classifications.
FSCS nondedicated system fan motor controller
switches do not need to be bypassed when:
•
Located in mechanical or electrical equipment rooms
•
Inaccessible to the general public
•
Operation of such a switch will result in a trouble
condition at the building's main control center
The VM-1 SCS, to be effective, should include an
FSCS series graphic annunciator with a building diagram
that indicates the type and location of all smoke control
equipment. The building areas affected by the
equipment, including barrier walls, should also be clearly
indicated (Figure 17).
The actual status of system components that are
activated or capable of activation for smoke control
should be clearly indicated at the FSCS smoke control
VM-1 Smoke Management Application Guide
Chapter 1: Fire geometry and smoke movement in buildings
station. Status indication is for on and off status of each
individual fan having a capacity of 2,000 cfm (944 L/s) or
more and used for smoke control. The ON status should
be sensed by pressure difference as a confirmation of
airflow. Damper position status is also often required by
UUKL and NFPA 92B.
HVAC system controls
Initial design of HVAC system controls or modification of
existing HVAC controls to incorporate smoke control
system requirements must include assigning the highest
priority to the smoke control mode.
Dedicated smoke control systems, while not utilizing
HVAC fans and controls, will sometimes require the
shutdown of the building HVAC equipment in addition to
the closing of dampers interconnected to the HVAC
system.
Nondedicated fire systems will use HVAC components
and control systems. HVAC control systems use
pneumatic, electric, electronic, and programmable logic-
based control units. All of these control systems can be
adapted to provide the necessary logic and control
sequences to configure HVAC systems for smoke
control. Programmable electronic logic or
microprocessor based control units for HVAC systems
which also provide other building control and monitoring
functions are readily adapted to provide the necessary
logic and control sequences for an HVAC system's
smoke control mode of operation.
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