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. - , � - ! - - • •- - e - �- - • -.• � � , ! . � - �� S�I�I , : i � Invented for life D285 Series Phot electric �rnoke Detector Heads (12/24 VD ) _ �.__ _..._ ► Commercial or residential applications �`=�"" '�^� ► Two-wire or four-wire a lication de endin on base _ .. --:i�__ -- - PP� . P g � ► Chamber Check rapid-flash LED sends contaminated ' � ff'" chamber reports , �; �;.� ; t , �;�� ► Flashing LED power indicator 1 ! � ' } ; ;� 1 � , �' ► Steady-On LED alarm indicator 4 � f� 91 P _ �: �_ , � 7 :`'� ► Modular design _ -'� e�.� _��_ .__._� �.-°' The D285 and D285TH detector heads detect the arge • D298S 24 V Four-wire Addressable (POPIT) Slave smoke particles which typically result from wood, paper, Detector Base (6 in. [15.2 cm] diameter) and fabric combustion.The D285TH smoke detec or also has a+135°F(+57°C)fixed temperature heat sens r.Use in _ _ areas where the ambient temperature does not e ceed � Functions �� _ I +100°F(+38°C).These detectors are compatible ith two- Detection chamber operation I wire or four-wire, 12 VDC or 24 VDC circuits.Also available The D285 and D285TH smoke detectors use an infrared(IR) are addressable bases for use on the POPEX bus. LED light source and a silicon photodiode to measure light These detectors have two components:the detec or base in a chamber. In normal conditions the light is absorbed in and the detector head.The base is permanently a tached the chamber.The presence of a significant number of and wired to a back box.The interchangeable hea s quickly particulates allows the light to reflect to the photodiode. detach for replacement and cleaning without affe ting After three consecutive measurements exceeding the circuit wiring.The D285 and D285TH detector hea s attach threshold level,the unit signals an alarm condition.The , to the following detector bases: detector can be reset from the control panel,after an alarm , • D278S 12 V Four-wire Addressable (POPIT) D tector condition is cleared, by interrupting power. Base (6 in. [15.2 cm] diameter) The detection chamber, designed for reliable smoke entry • D287 Two-wire Detector Base (5.5 in. [14 cm I diameter) characteristics, is protected by a micro-fine insect screen • D288 Two-wire Detector Base ([6 in. [15.2 c ] to reduce dust accumulation and insect penetration and diameter) minimize nuisance alarms. • D292 Four-wire Detector Base (6 in. [15.2 cm Chamber Check Feature diameter) To further reduce nuisance alarms,the D285 and D285TH • D293A Four-wire Detector Base (6 in. [15.2 c ] • diameter) with Form C Relay heads check their calibration.This Chamber Check feature • D293E Power Supervision Detector Base (6 i . is automatic. If the head is out of calibration for a period [15.2 cm] diameter) with Auxiliary Form A Re ay exceeding 24 hours,the Trouble-Alarm LED flashes once • D293S Four-wire Detector Base (6 in. [15.2 c ] per second,three times the normal rate. diameter) with Sounder I, • D298M 24 V Four-wire Addressable (POPIT) aster Testing Detector Base (6 in. [15.2 cm] diameter) Internal diagnostic test ' www.boschsecu rity.com