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Old 03-17-2014, 07:54 PM   #15
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Now I'm worried as I just replaced the battery in mine and it's 3.5 years old. On borrowed time.
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Old 03-17-2014, 08:52 PM   #16
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On a related note - I had to replace one CO Alarm in my townhouse after two years. It was warrantied for 5 years so I got free replacement from manufacturer.
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Old 03-18-2014, 10:08 AM   #17
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Now I'm worried as I just replaced the battery in mine and it's 3.5 years old. On borrowed time.
Speaking of replacing the battery reminded me of something I just learned. You should first disconnect the CO detector's 12V connection to the house battery and only then remove and replace the 9V internal battery. Otherwise you risk blowing the CO detector, which is probably what I did that necessitated replacing the CO alarm. It all started with a low battery alarm but switched to a "replace detector" alarm after I changed out the 9V battery without disconnecting the 12V line.
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Old 03-18-2014, 10:18 AM   #18
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As a matter of fact...I may have done the same thing to mine. Did not notice the disconnect warning until afterward.
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Old 03-18-2014, 10:21 AM   #19
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When I replaced my battery, I just removed the smoke/CO detector from the ceiling bracket. Then after a lot of cussing, managed to get the battery out and replaced. Didn't see any 12 VDC connection. No wires or other connection.

Sounds like the smoke/CO detector is different in the later models.
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Old 03-18-2014, 10:37 AM   #20
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My CO detector is wired to feed from both chassis and coach batteries, with the 9volt battery as a backup. Fortunately, there is a connector at which I was able to remove the assembly. My smoke detector is separate. I have a 2013 Interstate Ext on a 2012 chassis.
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Old 03-18-2014, 11:15 AM   #21
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My CO detector is wired to feed from both chassis and coach batteries, with the 9volt battery as a backup. Fortunately, there is a connector at which I was able to remove the assembly. My smoke detector is separate. I have a 2013 Interstate Ext on a 2012 chassis.
Odd. My 2012 Interstate has a combined smoke and CO detector (powered by a watch battery) on the ceiling, and a separate LPG detector (wired into the house batteries) near the floor.
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Old 03-18-2014, 11:34 AM   #22
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Airstream seems to change things ON THE FLY
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Old 03-18-2014, 11:37 AM   #23
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My CO detector is wired to feed from both chassis and coach batteries, with the 9volt battery as a backup. Fortunately, there is a connector at which I was able to remove the assembly. My smoke detector is separate. I have a 2013 Interstate Ext on a 2012 chassis.
I have the same setup, but the 9V battery is not a backup per se and is required to be charged for the CO alarm to function. In fact the low battery alarm, one red LED flash and a piercing tone every thirty seconds, will go off if the 9V goes dead, even when the 12V connection is hot. The manufacturer's web site recommends replacing the 9V battery at least once a year.

My 2013 AI has a smoke detector mounted on the ceiling immediately adjacent to the CO detector and the LP detector mounted on the baseboard under the kitchen cabinet.
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Old 03-18-2014, 12:31 PM   #24
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I did not understand why the manual called the 9 volt a backup since, as you said, it is required for the unit to operate.
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Old 03-18-2014, 06:50 PM   #25
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I did not understand why the manual called the 9 volt a backup since, as you said, it is required for the unit to operate.
Don't look at me. I'm not sure I understand it either. The best I can figure out is the actual detector runs on the 9V battery, but if there is a 12V connection it does not draw power from the 9V when there are 12V available?
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Old 03-19-2014, 06:55 AM   #26
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Don't look at me. I'm not sure I understand it either. The best I can figure out is the actual detector runs on the 9V battery, but if there is a 12V connection it does not draw power from the 9V when there are 12V available?
Don't know if this is right, but my theory is, it's like those emergency lights you see in office building stairwells. Those run on 120vAC, but have a built-in battery as well, for when the power goes out. If the battery goes bad, so does the light, to aid in troubleshooting, even if the bulbs are good and it's getting plenty of power. Can't have emergency lights that suddenly don't come on in an emergency, right?

The CO detector may be the same. It runs off of 12vDC house battery current, but has a 9v battery backup in case your power goes out (or wasn't switched on). After all, even if the power goes out, you still need to breathe so the CO detector still needs to work. So, if the battery goes out, an alarm goes off telling you it's time to change the battery, even though the detector is still working fine on house 12v power.

That's my theory, anyway.
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Old 03-19-2014, 07:05 AM   #27
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Makes sense to me....
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Old 03-19-2014, 08:42 AM   #28
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I assume (I know what that means) that there is a low battery warning on the ones that have the 12V supply just as there is on the 9V only combo detectors like mine.
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