Data Sheet for Product

ManualsBrandsSiemens ManualsFire - Addressable detectors and basesFDT421 Heat Detector, Installation Instructions

Siemens Data Sheet 6151

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Product Overview

The Intelligent Thermal (Heat) Detector (Model FDT421) provides an advanced method

of detection, address programming supervision ─ combined with sophisticated FACP

communication. Model FDT421 uses a state-of-the-art thermistor, microprocessor and

advanced signal analysis, providing high reliability and accuracy.

Additionally, Each Model FDT421 unit is UL listed including advanced built-in

ISOtechnology™ - a “True Class-X” SLC operation (use is optional) greatly

improving system reliability and circuit integrity while providing advanced

addressable fault finding.

Each model FDT421 is a cost-effective, two-wire / addressable thermal detector that

provides a distinctive, advanced feature: seven (7) field-selectable temperature settings

specially tailored for application-specific detection needs combined with Class-X SLC

operation built-in avoiding additional installation and material cost.

The temperature-range settings for each Model FDT421 detector is between 135°F

(57°C) ─ 175°F (79°C) with fixed and rate-of-rise programmability. This variance

provides the customer with maximum flexibility to program the temperature settings to

suit multiple application needs and changing environmental conditions.

Model FDT421 can be configured to provide a low-temperature warning signal at

40°F (4.4°C). This feature − along with a compatible FACP (Desigo Fire Safety

Modular | FireFinder XLS/V or with Desigo FC /FV2025 or FC /FV2050 FACPs) − serves

as prevention of water freezing in pipes for sprinkler systems, meeting NFPA 72.

Operation

Model FDT421 also utilizes a modern, accurate and shock-resistant thermistor to

sense significant changes in temperature.

Each Model FDT421 detector has seven (7) pre-programmed parameter sets that can

be selected by the Siemens FACP.

Desigo® Fire Safety

Detectors and Peripherals

Thermal (Heat) Detector

Model FDT421

Model FDT421-

Thermal (Heat) Detector

Architect & Engineer Specifications

 Built-in ISOtechnology™

 Compatible with Siemens Model `H’-

series devices on the same loop (with

Desigo Fire Safety Modular | FireFinder

XLS/V | FC/FV20–series fire-alarm

control panels

 Contains seven (7) field-selectable

settings in a temperature range of 135F

– 175F (57.2C – 78.9C)

 Provides a low-temperature warning of

40F (4.4C)

 Field programmable as rate-of-rise or

fixed temperature

 Tri-color detector-status light-emitting

diode (LED) with 360 ° view

 Compatible with Model DPU (device

programmer / loop tester)

 Utilizes advanced, microprocessor-based

signal processing

 Each detector is self-testing:

- complete diagnostics performed

every 10 seconds

 Polarity insensitive via SureWire™

technology

 Functions with Model DB-11–series

mounting bases

 Superior electromagnetic interference

(EMI) and radio-frequency interference

(RFI) immunity

 Restriction of Hazardous Substances

(RoHS compliant)

 UL 521 Listed, ULC Listed; CSFM (#7272-

0067:0258) Approved

Summary of content (5 pages)

PAGE 1
Desigo® Fire Safety Detectors and Peripherals Thermal (Heat) Detector Model FDT421 Architect & Engineer Specifications  Built-in ISOtechnology™  Compatible with Siemens Model `H’series devices on the same loop (with Desigo Fire Safety Modular | FireFinder XLS/V | FC/FV20–series fire-alarm control panels  Contains seven (7) field-selectable settings in a temperature range of 135F – 175F (57.2C – 78.9C)  Provides a low-temperature warning of 40F (4.
PAGE 2
1. Dust cover 2. Thermal (heat) detector 1 . NOTE: Each detector consists of a dust-resistant chamber; a solid state, functional internal sensor, and microprocessor-based electronics with a low-profile plastic housing. Every Model FDT421 fire detector is shipped with a protective dust cover. 1. Thermistor 2 Model FDT421 . Detector Supervision and Testing Model FDT421 contains a tri-color LED indicator, capable of flashing any one (1) of three (3) distinct colors: GREEN | YELLOW | RED.
PAGE 3
Application Data Installation of Model FDT421 intelligent, addressable thermal detector requires a two-wire SLC circuit. In many retrofit cases, existing wiring may be used. `T-tapping’ is permitted only for Style 4 (Class B) wiring. Model FDT421 is polarity insensitive when not used in Class-X mode, which can reduce installation and debugging times.
PAGE 4
Field-Device Programmer / Test Unit Model FDT421 is compatible with the Siemens field-device programmer / test unit (Model DPU), which is a compact, portable and menu-driven accessory for electronically programming and testing these addressable detectors promptly and reliably. For instance, the field technician selects the accessory’s program mode, and enters the desired address. Model DPU eliminates the need for cumbersome, unreliable mechanical programming methods (e.g.
PAGE 5
NOTICE – The information contained in this data-sheet document is intended only as a summary, and is subject to change without notice. The product(s) described here has/have a specific instruction sheet(s) that cover various technical, limitation and liability information. Copies of install-type, instruction sheets – as well as the General Product Warning and Limitations document, which also contains important data, are provided with the product, and are available from the Manufacturer.