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#62929 - 03/03/06 12:31 PM Smoke/CO2 Detector Combo Units  
Happi_Man  Offline
Joined: Jun 2002
Posts: 206
Columbus, Ohio - USA
Anyone have any great knowledge of these god forsaken things?

It seems like every other job I get a "bad" one. We wire our smokes on their own 15 AMP circuit and interconnect them using 14/3 romex. They go on an arc fault breaker. We then use a combo unit in the basement if there are gas mechanicals. Anyone see any problem with that. The combo units are the same manufacturer as the smokes. Typically what we are getting is that when you push the test button at the combo its sets off all the units except itself. Its driving me batty!

Are these things simply that unreliable or are we doing something wrong?

Any thoughts?

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#62930 - 03/03/06 02:57 PM Re: Smoke/CO2 Detector Combo Units  
mshaw  Offline
Joined: Jan 2006
Posts: 44
Fairborn, Oh, USA
Are they UL listed to be used togather with the other units?

#62931 - 03/03/06 04:10 PM Re: Smoke/CO2 Detector Combo Units  
Celtic  Offline
Joined: Feb 2005
Posts: 361
What brand and model # smoke/co units?

~~ CELTIC ~~
...-= NJ =-...

#62932 - 03/03/06 07:47 PM Re: Smoke/CO2 Detector Combo Units  
Joey D  Offline
Joined: Oct 2003
Posts: 259
Arlington MA U.S.
FireX? I have had the same thing happen and now use BRK and will do so until I have issues with them.

#62933 - 03/04/06 05:56 PM Re: Smoke/CO2 Detector Combo Units  
Happi_Man  Offline
Joined: Jun 2002
Posts: 206
Columbus, Ohio - USA
That's what I was lookin' for...yep, they are Firex. I was using BRK but they're so damned expensive. I guess therein lies the phrase "you get what you pay for".

#62934 - 03/05/06 09:48 AM Re: Smoke/CO2 Detector Combo Units  
Speedy Petey  Offline
Joined: Aug 2003
Posts: 173
Upstate, NY
There was a long run with the Firex CO/smokes having problems. I'd get a bad one every fourth or fifth one.
They have improved them and changed the p/n to 12000 from whatever it was and I have seen MUCH less issues with them.

Speedy Petey

"Anyone who has never made a mistake has never tried anything new." -Albert Einstein

#62935 - 03/09/06 01:47 PM Re: Smoke/CO2 Detector Combo Units  
Happi_Man  Offline
Joined: Jun 2002
Posts: 206
Columbus, Ohio - USA
Found out from Firex that some of the issues are actually misunderstandings. If you push the test buttom of a smoke detector or a smoke/co2 it will set off all of the alarms in the house except for itself. So its not actually "bad", its just working the way they've designed it to. I guess then to be sure you have to go to each alarm and push the test button. Probably should do that anyhow, right?

#62936 - 03/19/06 05:49 PM Re: Smoke/CO2 Detector Combo Units  
derater  Offline
Joined: Mar 2002
Posts: 179
Combo smoke/CO devices are a bad idea to begin with; smoke rises CO/CO2 is heavier than air so it sinks. I'd never use them.

#62937 - 03/19/06 08:16 PM Re: Smoke/CO2 Detector Combo Units  
daffy03221  Offline
Junior Member
Joined: Mar 2006
Posts: 2
bradford, nh, 03221
Derater is right, combo units suck, they are more costly than individual smoke and CO2, and the CO2 detector should be down by the furnace or whatever the heat is in the house, halfway down the wall. Have to ask, how does the 14-3 work on an arc fault? Won't that trip the breaker?

#62938 - 03/19/06 10:04 PM Re: Smoke/CO2 Detector Combo Units  
mxslick  Offline
Joined: Oct 2004
Posts: 803
Atomic City, ID USA

Welcome to ECN!

In this case, the 14/3 is most likely wired as Black = hot, white = neutral RED = "signal" (or "interconnect") which is a low-voltage link between units.

So this would not be the dreaded multi-wire application. [Linked Image] Thus no issue at all with the even more dreaded arc-faults.

Stupid should be painful.

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