Honeywell NOTIFIER SCS Series Operation And Installation Manual page 30

Concepts of Smoke Control
(S1), ensuring that the return damper (R1) is open, and turning on the return fan. Pressurization of all other areas is accomplished by closing
the return dampers, ensuring that the supply dampers are open, and turning on the supply fan. This example is using zoned smoke control
with mechanical exhaust.
Supply from
This example, although very basic, serves as the groundwork for zoned smoke control systems using pressurization and mechanical exhaust.
Two Supply and
Two Return Dampers at
each Floor
The building shown in Figure 2.24 is eight stories, where each floor is designated as a smoke control zone. There is also a stairtower and ele-
vator shaft to consider. The system depicted here is a dedicated system that will utilize pressurization. The stairtower has a multiple injection
system and the elevator hoistway will only be pressurized to prevent the migration of smoke (it will not be used for evacuation). All dampers
are normally open. When a fire is detected the following must occur:
• Pressurization of the stairwell and elevator shaft
• Pressurization of all non-smoke zones
• Evacuation of the smoke zone
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Exhaust to
Outside
Return Fan
Outside
Supply Fan
Figure 2.23 Smoke Control Using Fans and Dampers
Stairtower
Stairtower
Fan
R1 S1
Open Closed
Smoke Zone
Supply
Fan
Figure 2.24 Eight Story Building
Basic Smoke Control System Operation
R2 S2
Additional
Closed Open
Smoke Control
Zones
Smoke Control
Zone
Elevator
Return Shaft
Fan
Roof
Floor 8
Floor 7
Floor 6
Floor 5
Floor 4
Floor 3
Floor 2
Floor 1
Elevator
Hoistway Fan
SCS Series Manual — P/N 15712:L 7/18/16