Installing CMD5 CO Sensors

[Atalla]

Hey folks. Was swapping out the defunct CMD4s for new 5s. These are the interconnected ones. First one installs fine. Power, test, loud beeping. Second one doesn’t get power. The CMD4 didn’t function in this spot but I always thought it was the sensor not the power. So I move to the 3rd which has a currently installed CMD4 which has power (light on). Disconnect, install the new sensor. No power. Same black wire, same red wire, no power.

Go back to sensor 1 just to test the interconnect which should set all three alarms off to see if something like a faulty power light is the issue. Successfully test the first sensor but the others don’t fire and then it shuts off. No power. All three dead.

Now I can’t get any of these working. I feel I must have shorted them out somehow unless somebody has an idea of what I should look for. Nothing else funky on the boat. All other electrical is fine. I have no idea where these wires go from the walls in the salon and stateroom either.

Any ideas?

 

[bobeast]

I seem to recall someone saying there was an inline fuse behind your DC power panel. Of course I don't recall which exact boat model it was, but that's where I would start looking.

 

[Atalla]

I seem to recall someone saying there was an inline fuse behind your DC power panel. Of course I don't recall which exact boat model it was, but that's where I would start looking.

Shoot. I think I recall the same. I will dig in back there. Thanks.

 

[bbwhitejr]

I found the 1 amp fuses behind the DC panel in my 420DA.

There were 3 of them.

Bennett

 

[Atalla]

I found the 1 amp fuses behind the DC panel in my 420DA.

There were 3 of them.

Bennett

Thanks. One of the issues I'm facing is that the CMD4s were interconnected, however the relay wires on mines are also red/black. So I have two sets of red/black (along with the white/white interconnect wires for a total of 6) and I don't know which are meant to be yellow/brown (the CMD4 diagram shows red/black, yellow/brown, white/white). Even more, I don't know which direction each of the two white wires is going (to the previous sensor inline vs. the next one). So I'm guessing a bit and probably why I fried something.

 

[Cocktail Time]

Thanks. One of the issues I'm facing is that the CMD4s were interconnected, however the relay wires on mines are also red/black. So I have two sets of red/black (along with the white/white interconnect wires for a total of 6) and I don't know which are meant to be yellow/brown (the CMD4 diagram shows red/black, yellow/brown, white/white). Even more, I don't know which direction each of the two white wires is going (to the previous sensor inline vs. the next one). So I'm guessing a bit and probably why I fried something.

Atalla, I remember seeing a post where the person did the same and he had a wiring diagram from the manufacturer on how to convert. I would look through the pages of CO detector threads on here. It was pretty detailed.

 

[Atalla]

Atalla, I remember seeing a post where the person did the same and he had a wiring diagram from the manufacturer on how to convert. I would look through the pages of CO detector threads on here. It was pretty detailed.

Thanks. Yes. I have the wiring diagrams. The problem is the yellow/brown thing. The wiring diagrams for the CMD4s show red/black, yellow/brown and white/white pairs. I have red/black, red/black and white/white. I get that it is likely that my second, non-power, red/black pair is almost certainly the yellow/brown, but I don't know which is meant to be yellow and which is meant to be brown. Maybe I'll just buy a bag of fuses and do some guessing.

 

[Atalla]

Atalla, I remember seeing a post where the person did the same and he had a wiring diagram from the manufacturer on how to convert. I would look through the pages of CO detector threads on here. It was pretty detailed.

Follow-up. I found the thread you are talking about by looking for threads you were active in.

It is helpful as it mentioned an unused brown wire in the original CMD4 installation. I had an unused wire. In my case, it was the second black wire, which signals that is the "brown" wire in my case. So now I know which one the yellow one is.

Grazie mille!

 

[Cocktail Time]

Follow-up. I found the thread you are talking about by looking for threads you were active in.

It is helpful as it mentioned an unused brown wire in the original CMD4 installation. I had an unused wire. In my case, it was the second black wire, which signals that is the "brown" wire in my case. So now I know which one the yellow one is.

Grazie mille!

Since this question comes up more and more. Would you mind posting a wire diagram or a picture that illustrates what you needed to do? Happy to help. Merry Christmas!

 

[Atalla]

Since this question comes up more and more. Would you mind posting a wire diagram or a picture that illustrates what you needed to do? Happy to help. Merry Christmas!

Actually @trush did a fine job of that on the thread you referred to.

Post #12 - http://www.clubsearay.com/index.php...lacement-for-generator-shutdown-option.88302/

Or his Facebook version in the 390/40DA group here - https://www.facebook.com/groups/163406121014263/permalink/362137087807831/

 

[Atalla]

I found the 1 amp fuses behind the DC panel in my 420DA.

There were 3 of them.

Bennett

Were those inline fuses or? I’m having a hell of a time finding any fuses for these things. Have my panel off, looking in the bilge. Can’t figure it out.

EDIT: Nevermind. I’m a moron. Found them behind the DC panel. I had pulled the whole panel down and they were hidden on a forward facing piece of plywood that I couldn’t see from the back.

 

[Atalla]

For future searchers. This is what you’re looking for.

 

[bbwhitejr]

Yep, that is it...

Bennett

 

[Atalla]

Well, The CMD5s are all installed. Using @trush's post, linked in #10 above, proved helpful. All three correctly light the other two up when testing the alarm. I also installed the RCM5 relay behind the panel in the master stateroom starboard closet (behind the tv). NOTE: Just remove the TV and the mounting panel if you go down this path. Trying to assemble the relay through the closet panel is just unnecessarily painful. I tried for a few minutes and then did the smart thing and removed the tv panel which gives you a bunch more room and light to work.

Unfortunately, it appears I have some wiring issues on the other side of the RCM5 relay, as the alarm does not successfully shut down my generator. I should note that the generator runs even when the white relay wires are disconnected. This results in an open circuit which would shut the generator down if the wiring was correctly connected to the genset. So I'll dig into that another day as I wasn't in the mood to go bury myself in the generator on a Saturday night.

Thanks for all the support. I'll follow-up if I get the genset figured out for completeness.