Conventional Fire Alarms Heat Detectors 280 Series 280B-PL Series heat detectors offer fixed temperature or combination rate-of-rise and fixed temperature detection. FIRE ALARMS A temperature increase at the sensor of 15°F (9°C) or more per minute activates the rate-of-rise feature, closing the contacts in the sensor to transmit the alarm condition to the fire alarm control panel. When the rate-of-rise element alone has been activated, the sensor is self-restoring. If the temperature of the center disk rises to the sensor’s rated temperature, the fixed temperature element activates, closing contacts in the sensor and transmits an alarm condition to the fire alarm control panel. The fixed temperature element is non-restorable and, when activated, the detector must be replaced. The need for replacement is indicated when the center disk has fallen free from the detector. Edwards 280B series heat sensors come standard with a white plastic reversible mounting plate. The plate is designed for surface or flush mounting and installs directly to a standard North American 3 ½ or 4 inch octagon box. Once the mounting plate is fixed, a simple twist will lock the sensor in place. It can be removed using a screwdriver to release the tamper-resistant locking finger. Features and Specifications • UL listed for 50 ft. (15.2m) spacing • Single pole — normally open contact • Low profile with mounting plate • Pure white finish • Mounting flexibility with screw terminals • Easy twist-on installation • On-site testing of rate-of-rise feature • ositive operating indication — P for fixed temperature element • perating temperature range: -22°F to 100°F O (-30°C to 37.8°C) (281B-PL and 283B-PL); -22°F to 150°F (-30°C to 65.6°C) (282B-PL and 284B-PL) Ordering Information Contact Ratings Description Heat Detector - Fixed Temperature detector coverage has been determined by UL to provide detection time equal to sprinkler devices spaced at 10 ft (3.05m) intervals on a smooth ceiling 15 feet 9 inches (4.8m) high. Higher ceilings may adversely affect detection time. Earlier detection may be obtained by reducing the spacing between sensors. (See NFPA 72, Chapter 5)

Conventional Fire Alarms Heat Detectors 280 Series Accessories Description Reversible Mounting Plate with Heat Detectors Approx. Shipping Weight (lb.) FIRE ALARMS NOTE: The plastic mounting plate is molded to accommodate exposed wiring. To Install Detector– match arrows on detector and mounting plate. Push up and turn clockwise. To Remove Detector– Lift locking finger with screw driver tip and turn detector counter clockwise Flush Mount Conduit Wiring 2 Locking Fingers Flush Mounting Side Surface Mounting Side Surface Mounting Holes (4) Surface mount 2 snap-outs for wire entrance Flush Mount:...