Trane Engineered Smoke Control System for Tracer Summit, BAS-APG001-EN manual Response times

Response times

Response times

Response times are a pre-installation consideration. For a discussion of response time requirements for smoke control systems, refer to NFPA 92A (NFPA 2000, Recommended Practice for Smoke Control Systems), section 3.4.3.3 and NFPA 92B (NFPA 2000, Guide for Smoke Management Systems in Malls, Atria, and Large Areas), section 4.4.4. The activation sequence should be accomplished so as to avoid damage to the equipment. For example, the dampers should be opened before starting the fans. Table 7 shows the required response times, as published in the referenced NFPA documentation.

Table 7. NFPA response time requirements

Component	Response time
Damper operation to desired state	75 seconds
(open or closed)
Fan operation to desired state	60 seconds
(on or off)

Note:

Some building codes such as the Uniform Building Code have much more stringent response times. As with all of the considerations discussed in this chapter, the local authority having jurisdiction (AHJ) has the final word.

Cable distance considerations

Table 8 on page 30 given cabling distance requirements for data of two different types:

•Hardware based, such as from analog or binary inputs and outputs

•Communication based, such as from the Lontalk communication link or I/O bus (EX2)

The table also presents different cabling distance requirements depending on whether the data path is monitored or unmonitored.

There are no stated distance limitations for monitored information paths. The maximum distance allowed is the same as the manufacturer’s stated maximum distance for that particular data type. A data path is considered monitored if some notification for opens, ground-shorts, and conductor shorts is available and used (NFPA 72A [2002] section 4.4.7.1).

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