AC Powered smoke detectors like this almost always have a plastic receiver piece that screws to the ceiling / electrical box. The AC power wires attach to a short harness and connector assembly that passes through a hole on the receiver plate. This connector then attaches to the top side of the detector unit.. Subscribe Now:http://www.youtube.com/subscription_center?add_user=EHowatHomeChannelWatch More:http://www.youtube.com/EHowatHomeChannelJust because a smoke al.

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2 Remove the smoke alarm from the bracket. If you have a battery-operated smoke alarm, remove the smoke detector from its mounting on the ceiling. The method you use will vary depending on which type of smoke detector you have. Most models can be removed by twisting, sliding or clicking a click-into-place bracket.. Remove the alarm body from the bracket. Take out the old battery, connect the new battery to power connector. Fix the battery into battery box, fit alarm body on bracket and turn the alarm body clockwise. Test smoke alarm using test button. The sound pattern is 3 beeps, a pause for 1.5 seconds, repeated. If there's no sound output, it means.