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Spring Air Systems Water Wash Ventilator Maintenance Manual 11/01
20
Hood and Damper Assembly
THE SURFACE FIRE SUPPRESSION SYSTEM is always installed in am commercial kitchen. They are required by
national and local code. The surface fire suppression system is a wet chemical or a water sprinkler system. In the event
of a fire on the cooking surface electric thermostat or fusible links activates the systems. These systems must be
UL/ULC listed.
NOTE: The exhaust fan should remain on after a surface fire suppression system has activated.
A properly designed hood and damper assembly is UL/ULC listed to impede the spread of fire from the kitchen hood into
the exhaust duct. The UL/ULC listed hood and damper assembly is an important part of the kitchen ventilation system.
SPRING AIR SYSTEMS has three (3) arrangements of hood and damper assemblies available, arrangement “T”, “F”,
and “D”, thermostatic or fusible link activated systems respectively.
All SB & SBA Panels - Arrangement “D” Ventilators
The wet chemical surface fire suppression system is connected to the water wash panel. Terminals 5 & 1 are connected
to the normally open micro switch located in the control head of the wet chemical cylinder.
When the wet chemical fire suppression system activates the micro switch closes sending 120V/1/60 power back to the
control panel. Fire relay R6 is activated, the hot water solenoid valve is energized releasing water into the interior of the
grease extractor, and power to the motorized fresh air damper and supply fan motor starter is shut off.
NOTE: The exhaust fan remains on after a primary surface fire suppression system has activated.
Arrangement “D”: Fusible Link Activated, Dead Weight.
The arrangement “D” hood and damper
assembly consists of a fusible link damper
mounted in the exhaust duct collar.
In the event of a fire within the grease extractor
the fusible link melts closing the fire damper
against the force of a dead weight mounted on
the damper blade. The closed damper
impedes the spread of fire into the exhaust
ductwork. After the fire has been extinguished
the fire damper must be reset. To reset the
fire damper the fusible link is replaced. Open
the access door on the front of the ventilator.
Pull the fire damper open and replace the
fusible link to secure the damper in place. The
fusible link should be examined periodically in
accordance with the NFPA-96 (SPRING AIR
SYSTEMS recommends inspection every six
months.)
Arrangement “D” Fire Damper
Figure 20
NOTE:
The style “D” fire damper has no end switch and uses a dead weight for closure.
All MP, & AP Panels - Arrangement “F” & “T” Ventilators
The wet chemical surface fire suppression system is connected to the water wash panel. Terminals 5 & 1 are connected
to the normally open micro switch located in the control head of the wet chemical cylinder.
When the wet chemical fire suppression system activates the micro switch closes sending 120V/1/60 power back to the
control panel. Fire relay R6 is activated, the hot water solenoid valve is energized releasing water into the interior of the
grease extractor, and power is shut off to the motorized fresh air damper and supply fan motor starter. In addition power
is supplied for an electrical shunt trip through terminals 10 & 4.
NOTE: The exhaust fan remains on after surface fire suppression system has activated.
