Any electricians in the house or people who understand wiring?

[Nick]

I didn't realize CO2 detectors had a limited lifespan (about 5 years).

My house had these Safeair 240's installed.

See here:

You can see there are five connectors.

NO
COM
NC
GND
+12V

They don't make these anymore. I had to order a replacement, a GE250. , see here:

This one has seven connectors.
T
T
+
-
NC
C
NO

So, I am a little lost. I tried to wire this up the way I think it should go, but I am not having luck getting it to work. It has power and beeps, but is not interfacing with the alarm system in the house.

Here are the connections I tried to make:

OLD ---> NEW

GND ---> -
+12V --> +
NO -->NO
COM -->C

Doesn't seem to work right though.... I'm not getting the steady green light I think I'm supposed to get on the unit.

Any ideas? I have no idea what the rest of the stuff is and to be hones the wiring diagram (HERE) is gibberish to me.

Here's a guy with a similar issue http://www.doityourself.com/forum/e...8-ge-250-co-detector-installation-help.html#b, but I think his solution is different than mine. I was kind of hoping if someone saw the old wires, they would know what to do with them in the new unit.

 

[o3jeff]

Read the instructions!

 

[o3jeff]

My guess, but this is probably what you tried.
T - Alarm system, you don't have
T- Supervisory ? what is that I dont't know
+ -Red
- -Black
NC -green
C-yellow
NO

 

[wa-loaf]

Just don't cut the red wire!

 

[o3jeff]

By the way, I sell windows(and not the computer ones either) so my post above is just a guess!

 

[rocojerry]

also not an electrician, but the way you wired it looks like how I would have done it.

 

[o3jeff]

You sure you didn't get a bad detector?

 

[bigbog]

Talk with company's Tech Support.
My $.01 = above all else...don't gamble with voltage/resistance...etc.

 

[Nick]

i'm pretty sure the detector is good.

I do have an alarm system. it's a TCL or DCL or something like that.

 

[SkiFanE]

i'm pretty sure the detector is good.

I do have an alarm system. it's a TCL or DCL or something like that.

I'd figure out which color is the alarm wire. Then figure out which connector is for the alarm in the new box. This advice is worth only what you paid for it.

 

[bvibert]

Looking at the diagram (which doesn't really match the markings on your devices) there should be an End of Line Device between the NO terminal and the end T terminal (marked as C on the diagram), and also a wire between the C terminal and the other T terminal (marked NO on the diagram). I'm not sure what that End of Line Device is, probably a resistor. I'd call the company, they should be able to help you out pretty easily.

 

[bvibert]

Looking at the diagram (which doesn't really match the markings on your devices) there should be an End of Line Device between the NO terminal and the end T terminal (marked as C on the diagram), and also a wire between the C terminal and the other T terminal (marked NO on the diagram). I'm not sure what that End of Line Device is, probably a resistor. I'd call the company, they should be able to help you out pretty easily.

From reading that second link you sent it sounds like the EOL Device is a resistor, and it may be installed across the terminals of your alarm system. The wiring shown in the diagram you linked to is to enable the system to be able to detect a wiring problem. If the resistor is across the terminals in the alarm system then the system wouldn't be able to detect a problem with the wiring (like the wire got cut or disconnected).

It sounds like it should work the way you have it wired now (without the supervisory function working), since there was no resistor at the detector previously.

 

[Glenn]

I know enough about wiring to be dangerous. Your connections look correct to me. I think contacting tech support is a good idea. They may have information regarding your alarm system...or the end of line thing Brian spoke to above.

 

[Nick]

Thanks. So annoying, too bad they didn't leave it all the same from model to model. Ugh.