description the system sensor 2451 series photoelectronic smoke de - tectors are specifically designed to meet the performance re - quirements of fire detection/alarm systems. the 2451 and 2451t detectors use state-of-the-art optical sensing cham - bers and are designed so that led failure will not cause an alarm. the detectors are designed to provide open area detec - tion and when installed in a two-wire base are compatible with fci fire alarm control panels. the detectors operation and sensitivity can be tested in place. the model 2451t unit has the same specifications as the model 2451, but also fea - tures a built-in fixed temperature (135 o f) thermal detection unit. the detectors are of plug-in construction and plug into the same base as the 1451 series ionization smoke detectors, making both models interchangeable. bases are available for two-wire, four-wire, and 120 vac four-wire operation. two visible leds on each detector flash every ten seconds indicating that power is being applied to the detector. the leds light steadily when the detector is in alarm. a remote led annunciator is available as an optional accessory. the 2451 is ul listed for mounting inside ducts up to a ve- locity of 3,000 fpm. sensitivity testing is performed either by applying a test magnet or inserting a calibrated test card according to the test procedures. field metering of detector sensitivity may be performed with the aid of a voltmeter and test kit, mod 400r. approvals technical specifications nominal sensitivity 3.0 %/ft. operating voltage 8.5 - 35 vdc (24 vdc nominal) operating temperature 32 o to- 120 o f(0 o to 49 o c) operating humidity 0%-93% relative humidity air velocity 3,000 feet per minute maximum construction off-white flame retardant plastic diameter 6.2 inches (15.7 cm) height 3.3 inches (8.2 cm) weight 0.5 lb. (277 g) 2451 system sensor photoelectronic smoke detector 9020-0585/ver. 1.1 16 southwest park, westwood, ma 02090 usa tel: (781) 471-3000 fax: (781) 471-3099 features easy plug-in of the head to base built-in tamper-resistant feature built-in test switch built-in visual alarm indicators 360 o view angle of alarm leds compatible with fci control panels field metering of detector sensitivity removable insect screen and cover for field cleaning sealed against dirt, insects, and back pressure insect-resistant screening (.020"/.508 mm openings) an iso 9001 certified company
mounting on a 4-inch square box with or without plaster ring or supplied adapter. minimum depth 1.5 inches. on a 3 1/2 or 4-inch octagonal box. minimum depth 1.5 inches. on a single gang box. min. depth 1.5 inches. installation place the detector into the detector base. turn the de - tector clockwise until the detector locks into place. to use the tamper-proof feature, break the smaller tab on the scribed line in the tamper proof tab located on the detector mounting bracket. install the detector. to re - move the detector from the base when using the tam - per-proof feature, insert the blade of a small screwdriver into the hole on the side of the base and push the plastic lever away from the detector head. this will allow the detector to be rotated counterclockwise for removal. note : the decorative ring must be re - moved in order to remove the head when using the tam - per-proof feature. the tamper-proof feature may be defeated perma - nently by breaking the plastic lever off the base. note : the number of two-wire smoke detectors which can be accommodated per zone varies with dif- ferent control panels. consult the control panel in- struction manual to determine the capacity. refer to nfpa 72, chapter 5-3 ?smoke sensing fire detectors? for spacing, location of detectors and other guidelines. testing detectors may be tested in the following ways: place a test magnet against the cover opposite the test module socket (see illustration above). the detector should go into alarm within 5 sec - onds. a test card with one end marked ?alarm? and the other end marked ?no alarm? is fur - nished with each unit. for the complete proce - dure, refer to the installation and maintenance instructions furnished with each detector. field metering of detector sensitivity may be performed with the aid of a voltmeter and test kit mod 400r. for the complete procedure, refer to the installation and maintenance instructions furnished with each de- tector. maintenance cleaning programs should be adapted to the individ - ual environment in conformance with nfpa standard 72. we recommend, at the least, an annual cleaning of the unit. the detector screen and cover assembly can be removed, revealing the sensing chamber. a vacuum cleaner can be used to remove dust from the screen, cover and sensing chamber. for the complete proce - dure, refer to the installation and maintenance instruc - tions furnished with each detector. 2of2 9020-0585 ordering and technical information part no. model supv. alarm contacts description current current 2451 ?? ? ?? photoelectronic detector 2451t ?? ? ?? photo. detector w/135 o f thermal b401b .00012 a ? ?? base, two-wire b402b .00012 a .036 a form a, c* base, four-wire, 24 vdc operation 301b4ac form a, c* & supv. base, four-wire, 120 vac operation RA-400 .007 a remote alarm indicator pam-1 .015 a form b end of line relay, 24 vdc test kit * resistive load (contact ratings): form a - 2.0 a. @ 30 vac/dc form c - 2.0 a. @ 30 vac/dc, 1.0a. @ 120 vac ? note : alarm current of detector is limited by control panel initiating device circuit. warning : to prevent detector contamination during construction, smoke detectors must be protected from dust and contamination until area is clean and dust free. see nfpa 72-5-3.7.1.3. views showing position of test magnet specifications are provided for information only, are not intended to be used for installation purposes, and are believed to be accurate. however, no responsibility is assumed by fire control instruments, inc. for their use. specifications subject to change without notice. ? 2003 all rights reserved
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