4 Intelligent Products—2251J Plug-In Low Profile Intelligent Photoelectronic Smoke Detector
Model 2251J is a plug-in smoke detector that combines a photoelectronic
sensing chamber with addressable-analog communications. The detector
transmits an analog representation of smoke density over a communication
Signaling Line Circuit (SLC) to a fire alarm control panel.
This detector is designed to provide open area protection, and to be used
with compatible control panels only.
!
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).
The 2251J detector is designed to provide open area protection. It requires
compatible addressable communications to function properly. Connect
this detector to UL Listed-compatible control panels only.
General
Description
