Product Overview

ManualsBrandsFenwal ManualsCarbon Monoxide and Smoke DetectorsVertical Detect-A-Fire Detector, 5A (125V)

F-12-0-001

March 2020

FEATURES

• Repeatable - self-restoring, nothing to replace, testable

• Versatile - various temperature settings available

• Durable - long lasting stainless steel shell

• Economical - wide spacings reduce installation costs

• Factory set

• Internal contact area hermetically sealed in stainless steel shell

• ROHS Compliant

APPLICATIONS

• Protection of schools, factories, offices, libraries,

or other non-residential buildings

• Power generation

• Gas station islands

• Paint spray booths

• Range hoods

• Engine compartments

DESCRIPTION

DETECT-A-FIRE

(D-A-F) detectors are the "heart" of many fire protection systems. The highly reliable D-A-F has been the standard for

over 75 years. The D-A-F is used for signaling overheat or fire conditions. In the vast majority of applications, the D-A-F provides the ini-

tial heat sensing that is used to activate suppression systems using clean agent, CO

, inert gases, wet or dry chemicals or water.

D-A-F detectors are widely accepted, because they are designed with rate compensation. This provides a unique advantage over both

fixed temperature and rate-of-rise types of detectors because the D-A-F detector accurately senses the surrounding air temperature

regardless of the fire growth rate. At the pre-determined set point, the system is activated.

Fixed temperature detectors must be completely heated to alarm temperature and therefore a lag in response time may occur with a fast

rate fire. Rate-of-rise devices, on the other hand, are triggered by the rate of increase in ambient temperature and are subject to false

alarms caused by harmless, transient thermal gradients such as the rush of warm air from process ovens.

The key to the detector's sensitivity is in the design (Figure 1). The outer shell is made of a rapidly expanding alloy which closely follows

changes in surrounding air temperature. The inner struts are made of a slower expanding alloy. Designed to resist thermal energy

absorption and sealed inside the shell, the struts follow temperature changes more slowly.

A slow rate fire (Figure 2) will heat the shell and struts together. At the "set point", the detector will trigger, actuating the alarm or releasing

the extinguishant.

A transient rush of warm air up to 40°F/min. may expand the shell, while not triggering the detector. By ignoring transient warm air excur-

sions, the D-A-F detector virtually eliminates false alarms prevalent with rate-of-rise devices.

If a fast rate fire (Figure 3) starts, the shell will expand rapidly. The struts will close, actuating the alarm and/or releasing the agent. The

faster the fire rate of growth, the sooner the D-A-F detector will react.

Figure 1. Ready Figure 2. Slow Fire Figure 3. Fast Fire

DETECT-A-FIRE

Detection and Release Devices

Summary of content (6 pages)

PAGE 1
DETECT-A-FIRE® Detection and Release Devices F-12-0-001 March 2020 FEATURES • Repeatable - self-restoring, nothing to replace, testable • Versatile - various temperature settings available • Durable - long lasting stainless steel shell • Economical - wide spacings reduce installation costs • Factory set • Internal contact area hermetically sealed in stainless steel shell • ROHS Compliant APPLICATIONS • Protection of schools, factories, offices, libraries, or other non-residential buildings
PAGE 2
VERTICAL DETECT-A-FIRE DETECTOR SPECIFICATIONS Vertical D-A-F detectors are designed for use in both "ordinary" or "hazardous" locations. For "ordinary" use, they may be mounted to any approved junction box with 7/8" diameter opening by using 1/2-14 NPT mounting nuts. The device may be wired in or out of conduit, depending on local preferences and codes. To facilitate supervision of system wiring, four lead wires are provided on normally open vertical detectors (that close on temperature rise).
PAGE 3
HORIZONTAL DETECT-A-FIRE DETECTOR SPECIFICATIONS Horizontal D-A-F detectors are designed for locations where appearance is a factor. The low-profile, functional design lends physical protection of the detector while making it suitable for commercial, industrial, mercantile public buildings, institutions, and marine applications in non-hazardous locations (those classified as "ordinary" under the National Electric Code).
PAGE 4
HORIZONTAL AND VERTICAL DETECT-A-FIRE Table 5: D-A-F Response Time Index (RTI) and Spacing Model No.
PAGE 5
TEMPERATURE SETTING SELECTION To avoid nuisance activations, Fenwal Controls strongly suggests selecting a D-A-F detector with a temperature setting a minimum of 100°F above the maximum ambient expected temperature. DEVICE SELECTION The table below shows three categories of fire detection devices and their relative response levels for reaction to three different rate-ofrise conditions. Consult the AHJ for specific applications.
PAGE 6
DETECT-A-FIRE MOUNTING BOX Figure 7. Optional Explosion Proof Mounting Box, P/N 06-116317-001 Note: Figure 7. Complies with NEC Class I, Groups A, B, C, D, Class II, Group E,F,G, Class III, and U.L. Standard 1203. Explosion Proof Mounting Box must be purchased separately from the D-A-F. HOW TO ORDER 1. Select a D-A-F model from specifications in Table 2 for vertical design or Table 4 for horizontal design. 2.