Smoke detection and system activation
Zoned smoke control detection and activation
Zoned smoke control activation occurs on a signal from either a sprinkler water flow switch or a heat detector. For maximum benefit, the zoned smoke control system should only respond to the first alarm. Two design techniques that prevent detection of smoke in zones other than the first zone reporting are:
•Not activating smoke control on smoke detector signals
•Activating smoke control on signals from two separate smoke detectors located in the same zone
Note:
Zoned smoke control should not activate on a signal from a manual pull station (pull box). If pull box activation does not occur in the zone that contains the fire, activation incorrectly identifies the smoke zone.
Stairwell smoke control detection and activation
Stairwell smoke control activation occurs on an alarm signal from any device, including sprinkler water flow switches, heat detectors, smoke detectors, and manual pull stations (pull boxes). Most stairwell smoke control systems operate in the same manner regardless of the source of the alarm signal.
Elevator smoke control detection and activation
Elevator smoke control activation occurs on an alarm signal from any device, including sprinkler water flow switches, heat detectors, smoke detectors, and manual pull stations (pull boxes). Most elevator smoke control systems operate in the same manner regardless of the source of the alarm signal.
Note:
The description of elevator smoke control detection and activation does not apply to pressurization systems for elevators intended for occupant evacuation.
Atrium smoke exhausting detection and activation
Atrium smoke exhausting activation occurs on a signal from a beam smoke detector. A beam smoke detector consists of a light beam transmitter and a light beam sensor. Typically, the transmitter and the sensor are located apart from each other. However, when located together, the transmitter sends its beam to the opposite side of the atrium. At the opposite side, the beam reflects back to the sensor.
Note:
Atrium smoke control should not activate on a signal from a manual pull station (pull box). Atrium smoke exhaust systems have different operating modes depending on fire location.
13 |
