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General| Sensitivity | 0.005% to 20% obs/m |
|---|---|
| Communication | Relays, Ethernet |
| Power Supply | 24V DC |
| Airflow Monitoring | Yes |
| Sensitivity Range | 0.005% to 20% obs/m |
| Operating Voltage | 24V DC |
| Power Consumption | Typically 10W |
| Operating Temperature Range | 0°C to 39°C (32°F to 102°F) |
| Humidity Range | 10% to 95% non-condensing |
Explains the purpose and scope of the design guide for VESDA in refrigerated environments.
Provides a summary table of key design considerations for VESDA systems in refrigerated facilities.
Discusses fire risks and areas to be protected in refrigerated storage facilities based on NFPA statistics.
Explains how performance-based design tailors fire protection to specific refrigerated environments.
Outlines temperature ranges for different areas and crucial questions for fire protection system designers.
Highlights the advantages of VESDA ASD systems for early warning detection in freezing conditions.
Details suitable pipe materials for low-temperature environments and their properties.
Covers placement of VESDA pipes and sample holes according to codes and performance requirements.
Recommends insulation materials and thickness for VESDA sample pipes in cold environments.
Emphasizes proper sealing of pipe penetrations through insulation panels for air-tightness.
Explains how to account for pipe expansion/contraction due to temperature changes using mounting clips.
Discusses locating sample pipes along racks within refrigerated areas for in-rack sampling.
Addresses early smoke detection in ceiling voids due to electrical and control equipment risks.
Describes sample hole spacing and layout for non-refrigerated areas, similar to general office environments.
Explains how temperature drops cause condensation or ice formation in and on VESDA pipes.
Details condensation on outer pipe surfaces where they exit cold areas and recommends water trays.
Addresses occasional ice formation on pipes near entrances and methods to prevent blockage.
Discusses rare internal condensation and measures to prevent it from reaching the detector.
Advises against 90° elbow junctions and in-path chiller air vents to prevent ice plug formation.
Explains warming sampled air by extending pipes to prevent low temperatures affecting detectors.
Discusses heat tracing for air warming but notes it's not FM recommended or validated.
Details returning VESDA exhaust air to the sampled area to maintain pressure and prevent faults.
Explains the use and installation of water traps for condensation management in sample pipes.
Describes how VESDA systems can activate pre-action sprinkler systems.
Outlines requirements for battery backup for VESDA systems, especially when used for pre-action suppression.
Advises on powering up the VESDA system during commissioning and handling existing installations.
Explains verifying system performance and pipe network integrity using ASPIRE2 and smoke tests.
Covers servicing and maintenance requirements according to codes and manuals, including pipe inspection.
Details techniques for warming sampled air, focusing on electrically heated tape and related charts.
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