Kidde VM-1 Manual page 38

Chapter 2: Smoke control system hardware
Central HVAC systems
Central HVAC systems are most often used in multiple
floor buildings with a single HVAC system providing
service for 6 to 20 floors.
Conditioned air is supplied to each floor via large vertical
shafts with each HVAC zone having reheat provisions.
Table 3: Single zone smoke control settings with direct outside air and direct exhaust air
Smoke zone
Supply fan OFF
Return fan ON
Exhaust air damper OPEN
Return air damper CLOSED
Outside air damper CLOSED
Reset static pressure control to maximize air
flow and prevent duct failure
Table 4: Single zone smoke control settings with common outside air and exhaust ducts
Smoke zone
Supply fan OFF
Return fan ON*
Exhaust air damper OPEN
Supply air damper
CLOSED
Return air damper CLOSED Return air damper CLOSED
* If no return fan is present, dampers are still positioned as indicated.
Table 5: Central system smoke control settings
Smoke zone
Exhaust air damper OPEN
Supply air damper CLOSED
34
Adjacent zones
Supply fan ON
Return fan OFF
Exhaust air damper CLOSED
Return air damper CLOSED
Outside air damper OPEN
Reset static pressure control to maximize air
flow and prevent duct failure
Adjacent zones
Supply fan ON
Return fan OFF*
Exhaust air damper CLOSED
Supply air damper OPEN
Adjacent zones
Exhaust air damper CLOSED
Supply air damper OPEN
Damper positioning is the key component in isolating
smoke control zones in these systems.
Control of static pressures in large vertical shafts
supplying or exhausting air is necessary to prevent duct
collapse or rupture during smoke control events.
See Table 5 below for control settings.
Common outside and exhaust air system
Supply fan ON*
Return fan ON*
Exhaust air damper OPEN
Outside air damper OPEN
Reset static pressure control to maximize air
flow and prevent duct failure
Central system
Supply fan ON
Return fan ON
Exhaust air damper OPEN
Outside air damper OPEN
Return air damper CLOSED
Reset static pressure control to
maximize air flow and prevent duct
failure
Remote zones
Maintain HVAC operation while power supply is
available without impacting fire area smoke
control operations
Common remote zones
Supply fan OFF
Return fan OFF*
Exhaust air damper CLOSED
Supply air damper CLOSED
Remote zones on central system
Exhaust air damper CLOSED
Supply air damper CLOSED
VM-1 Smoke Management Application Guide