Metasys 2551J, Manual

4    Intelligent Products—2551J and 2551TJ Plug-In Intelligent Photoelectronic Smoke Detector

The model 2551J/2551TJ photoelectronic, intelligent analog detectors
utilize a state-of-the-art, optical sensing chamber.  These detectors are
designed to provide open area protection and to be used with compatible
control panels only.  Connect detectors only to compatible control units.

The detectors transmit an analog value representation of the smoke density
over the communication Signaling Line Circuit (SLC) to a fire alarm
control panel.  When the heat detection element of the 2551J senses a
temperature above its alarm point, it increases the transmitted analog value
to a level that will cause an alarm in the system.

!

 CAUTION: Equipment hazard.  Do not use in potentially

explosive atmospheres.  Do not leave unused wires
exposed.

Rotary decade switches are provided on the back of the detector for setting
the detector’s SLC address.

The detector has two Light Emitting Diodes (LEDs) that provide visual
indication of the detector’s status.  In normal mode, the LEDs blink every
time the detector is polled by the control panel when the blink feature is
enabled in the system programming of the control panel.  When the
detector is in alarm, the LEDs are latched into a constant On condition.
When the system and the detector is reset after an alarm, the LEDs will
return to the normal blink mode if programmed.

Note that only five detectors on any one SLC can latch on the detector
LEDs in the alarm condition.  However, if the detectors are designed to
limit the current drawn from the SLC, the system can be programmed to
latch on more LEDs when additional detectors are in alarm.  This mode is
needed if a relay or sounder detector mounting base is used when
controlling an auxiliary function such as equipment control or local
signaling, or if a duct smoke detector relay controls a HVAC fan.

Remote LED annunciation capability is available as an optional accessory
(RA400Z).

In order to assure proper operation this product should be applied as
specified in the applicable NFPA codes and in compliance with its
UL listing.

!

 CAUTION: Personal injury hazard.  This device will not

operate without electrical power.  Frequently, fire
situations may cause an interruption of power.  The
system safeguards should be discussed with your
local fire protections specialist.

General
Description