Trane Engineered Smoke Control System for Tracer Summit, BAS-APG001-EN manual Area smoke detectors

Associated equipment

beam, and duct smoke detectors; manual pull stations; and sprinkler flow devices.

Note:

Fire alarm system equipment is neither furnished nor installed by Trane.

Area smoke detectors

Area smoke detectors detect the presence of smoke at the ceiling. When activated, an area smoke detector signals the fire alarm system. The zoning of area smoke detectors must reflect the zoning of the building.

Note:

Under certain conditions, heat detectors or heat with rate of rise detectors are preferable to area smoke detectors.

Beam smoke detectors

Beam smoke detectors detect the presence of smoke beneath the ceiling. When activated, a beam smoke detector signals the fire alarm system. In atrium applications, beam detectors may replace area smoke detectors.

Beam smoke detectors minimize interference problems created by stratified hot air under the atrium ceiling.

Duct smoke detectors

Duct smoke detectors detect smoke in building air-distribution system ductwork. When smoke is present, a signal from the detector deactivates the fans in the system in which the detector is installed. However, smoke control system commands must override fan deactivation by a duct smoke detector.

In NFPA 90A (NFPA 2002, Standard for the Installation of Air Conditioning and Ventilating Systems), section 6.4.2.1 provides the requirements for duct smoke detectors. Supply duct smoke detectors must be located downstream of the system filters and ahead of any branch connection. In mixing systems, this is usually after the return air connection. Duct smoke detectors may be required in the supply duct of all air-handling systems greater than 2000 cubic feet per minute (CFM) and at each floor with a return air volume greater than 15,000 CFM.

Two exceptions limit the use of duct smoke detectors:

•Duct smoke detectors are not required in 100% exhaust air systems.

•Duct smoke detector use is limited if area smoke detectors cover the entire space served by the return air distribution. Since area smoke detectors usually cover entire floors, the typical system only requires one duct smoke detector in the common return duct.

Manual pull stations

Manual pull stations enable occupants to report a fire. When activated, a manual pull station signals the fire alarm system. A manual pull station alarm must not initiate the automatic operation of the smoke control

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