If your hard-wired SD does not have a battery back up,you NEED to replace all of them with hard-wired ones that do have a battery backup...
Smoke detector is chirping....
- Thread starter AstroVic
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I just had to replace two originals that were hard wired in my house built in 1991, they had no replaceable battery back up and started going off and when one went they both sounded off. Go to Home Depot and look for BRK 9120B 2 pack of detectors only cost 22 bucks or so, they even have adapters that may fit your existing plug and if not they have the new pigtail, plus 9 volt back up. Easy swap anyways. And the newer smoke detectors dont have as many false alarms, my old ones went off when ya burn toast or they go off to tell ya dinners done.
Old detectors don't have batteries..Fact
Old detectors worked off of 12V- Fact
I would just repmove this dinosaur. Out wire nuts on the electrical leads and slap a battery detector ($5) in there. End of story. Not worth 1 minute of thought. cheeeesch.
Old detectors worked off of 12V- Fact
I would just repmove this dinosaur. Out wire nuts on the electrical leads and slap a battery detector ($5) in there. End of story. Not worth 1 minute of thought. cheeeesch.
This just happen to me about two months ago. 1 in the morning and chrip chrip. Elbow in the ribs from the wife and downstairs I went. Nothing like removing the SD and then still have the thing chriping. Went to the store the next day and bought 9v for all of them and spent the next hour changing the batteries.
ASTRO, try this. I have the same setup, hardwired, no battery backup. Get out your vaccum cleaner, install the dust brush and give it a good cleaning. Yep, I too was up at 3am the other morning vaccuming the dang thing to get it to quit chirping! Our smoke detector and I have meetings like this about every 6 months or so.
They don't use a transformer--they use a big high-value resistor to drop the 120V AC to something reasonable and then rectify/filter it.
(I've taken a couple of them apart).
This is also why they have to be wired correctly with respect to hot and neutral. Wire them backwards, and if it's interconnected with another smoke alarm, that alarm will continuously go off (at least according to the manual that came with mine--I haven't done this experiment).
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