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Spring Air Systems
REV LOW
Engineering Manual Revision 2.0 -021902
10
In the event of a fire within the core extractor the thermostat will
activate at 360F (182C). The thermostat energizes a solenoid,
which pulls the fire damper pin releasing the fire damper. The
spring loaded fire damper closes tight against the blade stops.
As the fire damper shuts an electric signal is sent to the water
wash control panel. Once the signal reaches the water wash
control panel the exhaust fan shuts off, shunt trip contacts
close, and the hot water solenoid valve energizes to flood the
interior of the grease extractor. The hot water spray and closed
fire damper provide an effective fire barrier to impede the
spread of fire into the exhaust ductwork.
After the fire has been extinguished, rotating a lever on the
outside of the SOE, FIRE DAMPER JUNCTION BOX, manually
resets the fire damper.
Arrangement
“T”
&
“F”
Activated
Figure 11
The arrangement “T” has three advantages:
1. The damper is spring loaded to provide a positive closure and seal when closed.
2. The thermostat set at 360F (182C) responds quickly to activate the spring in the event of a
fire.
3. Pushing the fire test button in the control panel can periodically test the fire damper. The
damper will activate as if in a fire condition and can be manually reset.
Arrangement “F”: Fusible Link Activated, Spring Loaded.
The arrangement “F” hood and fire damper assembly consists of a fusible link fire damper and a
damper end switch interlocked electrically to the water wash control panel with two wires.
In the event of a fire within the core extractors, the fusible link melts, closing the fire damper
against the force of a spring. When the fire damper completely closes, the microswitch is
activated and an electrical signal is sent to the water wash control panel.
Arrangement “F” Fire Damper
Figure 12
END VIEW
SIDE VIEW DAMPER OPEN POSITION
SIDE VIEW DAMPER CLOSED POSITION
MICRO SWITCH
SUPPORT BRACKET
FIRE DAMPER PIN
BACK STOP
DAMPER ROD
FIRE DAMPER PIN
MICRO SWITCH
MICRO SWITCH N/0 POSITION
WHEN DAMPER OPEN
TERMINAL BLOCK
BX CONDUIT
TO J-BOX
ON TOP OF
VENTILATOR
FIRE DAMPER
CLOSURE SPRING
FIRE DAMPER PIN
(DAMPER OPEN)
FIRE DAMPER PIN
(DAMPER CLOSED)
MICRO SWITCH N/C POSITION
WHEN DAMPER CLOSED
FIRE DAMPER
CLOSURE SPRING
80 DEGREE PIN
ROTATION TO
DAMPER CLOSED
POSITION.
POST
RETAINING
SPRING
TERMINAL
BLOCK
ENCLOSURE