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
12
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
• Positive operating indication —
for fixed temperature element
• Operating temperature range: -22°F to 100°F
(-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 -
Cat. No.
281B-PL
Rate of Rise
and Fixed Temperature
282B-PL
Heat Detector -
283B-PL
Fixed Temperature
284B-PL
Voltage
Amps
6-125V AC
3.0
6-24V DC
1.0
125V DC
0.3
250V DC
0.1
6-125V AC
3.0
6-24V DC
1.0
125V DC
0.3
250V DC
0.1
6-125V AC
3.0
6-24V DC
1.0
125V DC
0.3
250V DC
0.1
6-125V AC
3.0
6-24V DC
1.0
125V DC
0.3
250V DC
0.1
Temperature
UL Recommended
UL Rated
UL Max
Ambient at Ceiling
Coverage1
Spacing
FM
Recommended
Spacing
135ºF (57ºC)
100ºF (38ºC)
2500 ft.2 (232m2)
50 ft. (15.2m)
30 ft. (9.14m)
194ºF (90ºC)
150ºF (66ºC)
2500 ft.2 (232 m2)
50 ft. (15.2 m)
30 ft. (9.14m)
135ºF (57ºC)
100ºF (38ºC)
2500 ft.2 (232m2)
50 ft. (15.2m)
30 ft. (9.14m)
194ºF (90ºC)
150ºF (66ºC)
2500 ft.2 (232m2)
50 ft. (15.2m)
30 ft. (9.14m)
1Maximum
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)
AC/DC
12-24
TM
www.edwardssignaling.com
Conventional Fire Alarms
Heat Detectors
280 Series
Accessories
Description
Cat. No.
Reversible Mounting Plate
280A-PL2
2Included
with Heat Detectors
Weights and Dimensions
Approx. Shipping
Weight (lb.)
281B-PL
1.0
282B-PL
1.0
283B-PL
1.0
284B-PL
1.0
12
FIRE ALARMS
Cat. No.
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.
Electrical Box
(Not supplied)
1 13/32"
(36mm)
To Remove Detector–
Lift locking finger with screw
driver tip and turn detector
counter clockwise
Flush Mount
Conduit Wiring
0.145"
(4mm)
2 Locking Fingers
Flush
Mounting
Side
Surface
Mounting
Side
5"
(127mm)
Surface
Mounting
Holes (4)
4 1/2"
(114mm)
Surface
mount 2
snap-outs
for wire
entrance
Flush Mount: Break
away 2 sections on
circumference
21/32"
(52mm)
Front View
Plastic Reversible Mounting Plate Cat. No. 280A-PL
www.edwardssignaling.com
Front View
Metal Mounting Plate P/N 280-MPL
(Order separately)
TM
12-25
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