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OPERATION
The EWC extinguishing system is electrically operated via the applicable fire alarm control panel. The
system can be activated automatically via an electric thermal detector or manually via a remote manual
actuator. The EWC extinguishing system is electrically operated via the PCBCORE control board. The
system can be activated automatically via a Firestat or manually via a remote manual actuator. Since the
EWC extinguishing system is electrically operated, the applicable fire alarm control panel requires AC
input power with a battery backup system. Reference the applicable control panel manual for wiring and
compatibility.
When one of the system’s Firestat(s) detectors senses a temperature hotter than its internal set-point (e.g.,
in the event of a hood fire), or when a remote manual actuation device (push/pull station) is pushed, an
electric signal is sent to the tank-based fire protection release solenoid via the fire alarm control panel
releasing circuit. The electric release solenoid is energized, allowing pressurization of the pneumatic
actuator(s). The actuator’s plunger(s) will depress into the tank valve body, releasing agent to flow to the
hood duct, plenum, and appliance nozzles.
When the fire extinguishing system is activated, the applicable fire alarm control panel simultaneously
shuts down all gas and electric appliances under the protected hood(s), shuts down make-up air and/or
exhaust where applicable, and activates the building fire alarm where applicable.
A means of manual reset is required for shut-off devices to ensure manual reset prior to fuel or power
being restored in accordance with NFPA 17 and NFPA 96. The electric gas shut-off valve is used in
conjunction with a UL/ULC listed manual reset relay, refer to
“Gas Shut-Off Valves” on page 40.
Test Mode Overview
The fire protection system has an integrated option for testing. This test mode, when active, will disable the
release solenoid and prevent the fire extinguishing agent from spraying on the appliances. It will allow
activation of the fire system, audible alarm, shunt trip breaker (if applicable), and shut down of appliances
via gas valve reset relay.
All additional PCBCORE controlled packages that are attached to the system must be in “Test Mode.” This
includes additional fire protection systems, Pollution Control Unit with CORE, and other hood-mounted
CORE controlled protection systems.
Please note that the appliances must be started before test mode is entered on any PCBCORE protection
package for proper demonstration of this function. If the fire protection system is left in “Test Mode” for
more than 15 minutes, the appliances will shut down. This is to prevent cooking operations from occurring
while the appliances and ventilation system are not protected.
Summary of Contents for EWC
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