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2 I D285 Series Photoelectric Smoke Detector Heads (12/24 VDC) Chamber Check Feature Mounting To further reduce nuisance alarms,the D285 and D285TH The D285 smoke detector head and D285TH smoke and heads check their calibration.This Chamber Check feature heat detector head are parts of a compound device.The is automatic. If the head is out of calibration for a period detector base installs over a back box and contains all the exceeding 24 hours,the Trouble-Alarm LED flashes once wiring.The detector head attaches to the base by aligning per second, three times the normal rate. the head with the base and turning it clockwise. No tools Testing are required for installation other than the hex key used to Internal diagnostic test tighten the optional tamper screw. These heads have moisture-proof reed switches that react Wiring to an external magnet for testing. The magnet test The terminal block accepts up to 12 AWG (2.3 mm) wire. simulates a 4% to 6%smoke obscuration that places the detector in an alarm condition. This test results in specific LED and alarm circuit responses to indicate: Technical Specifications • Detector within calibration standards Environmental Considerations • Detector settings outside sensitivity standards • Detector not operational Radio Frequency No alarm or setup on critical frequencies in This test is especially useful in environmentally unstable Interference(RFI) the range from 26 MHz to 950 MHz at field or unclean areas. Immunity_ -- strengths less than 50V/m Sensitivity voltage test -Relative Humidity: Up to 93%,non_condensing_ These detector heads have a socket that accepts the Temperature(operating): +32°F to+100°F(0°C to+38°C) D1005 Test Cable.The D1005 connects to the detector Mechanical Properties head and allows a voltmeter to read the sensitivity of the device. Color: Bone white -- – — LEDs Dimensions(diameter x D): 4 in.x 1.25 in.(10.2 cm x3.2 cm) The D285 and D285TH have a built-in LED that flashes to Power Requirements indicate the device is powered.The LED latches on steady Current Two wire:depends on control panel that must limit the in an alarm condition. (alarm): alarm current to 100 mA maximum Four-wire:depends on detector base;refer to pertinent base specifications _ Certifications and Approvals Current Two-wire:0.08 mA at 12 VDC;0.09 mA at 24 VDC (standby): Four-wire(D293E):4 mA at 12 VDC or 24 VDC RegionCertification RMS Ripple 25%of DC input - i (maximum): USA UL UROX:Smoke-Automatic Fire Detectors Voltage(in Two-wire:8.5 VDC to 33 VDC (UL268 and A),UROX7:Smoke- put): Four-wire:10 VDC to 30 VDC Automatic Fire Detectors Certified for Canada(cULus) CSFM 7272-1615:0134 SMOKE DETECTOR- SYSTEM TYPE-PHOTOELECTRIC NYC-MEA 274-93-E,Vol.VII MSFM Hong Kong HKFSD Installation/Configuration Notes Note Smoke detectors are intended for detection circuits that protect people. Heat detectors are appropriate for circuits that protect property.