Mains powered smoke alarm

AndyPRK said:
Well there is no battery.
And a circuit board where the battery would normally fit.

Maybe a master unit has a battery ?
Click to expand...
The house alarm has a stand-by battery. That would suggest that this smoke alarm is connected in to the house alarm.
If that is the case, the alarm engineer has never mentioned it on his annual visits.

Am I correct in assuming that, like all smoke alarms, the sensor becomes less reliable as it ages?

If so, I could ask the alarm company if they can replace it.
 
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I doubt it’s part of the burglar alarm.
Yes smokes need changing every 10 years.

Now you know the outside colour of the cable and colour you will have to have another look in the loft or downstairs to see where it goes.
Yeah I know it’s boarded.

Is this the only alarm in the house ?
Is it flats ?
Does it work whentest button pressed ?
 
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Taylortwocities said:
A single point of failure?? I doubt that. there are systems with a central battery, but those are for large commercial installations.
Click to expand...
There is certainly a back-up battery in the home alarm system. It is checked annually and replaced as necessary.
The alarm system is mains-powered, so there must be a means of stepping down the voltage to connect to all the sensors as well as (presumably) this smoke detector.
 
AndyPRK said:
I doubt it’s part of the burglar alarm.
Yes smokes need changing every 10 years.

Now you know the outside colour of the cable and colour you will have to have another look in the loft or downstairs to see where it goes.
Yeah I know it’s boarded.

Is this the only alarm in the house ?
Is it flats ?
Does it work when test button pressed ?
Click to expand...

Thank you. Yes, I would expect to have to change it, yet it has been here longer than we have - 15 years!

The cable attaching to the smoke alarm (shown on my photograph) appears, in size and colour, exactly like those connecting sensors elsewhere in the house. There are several such cables around the loft which seem to lead to a single steel box. I'm beginning to realise that one of them will lead to/from the smoke alarm.

No, not the only fire alarm. I have two others (I recently replaced) which are normal battery-powered heat alarms.

No, we're not in a flat. It's a bungalow and the loft is directly above this smoke alarm.

Yes, it sounds when I press the test button, though I can't be sure that the smoke sensor is still working to the best of its ability.

Thanks again for your interest.
 
now that I look at it again. That does look like burglar alarm wiring!

For an easy live, you fit a new one a couple of feet away.
 
Screenshot_20200913-171941.png
That's a Aico Ei100r 12 volt interlink smoke detector which will more than likely be connected to the INTRUDER alarm system
 
Handymanjo said:
View attachment 204724
That's a Aico Ei100r 12 volt interlink smoke detector which will more than likely be connected to the INTRUDER alarm system
Click to expand...
Thank you. Yes, that looks exactly the same as ours, presumably with the same circuit board inside in place of a back-up battery.
I think I'll first have a word with our alarm company and see what they say.
If, however, they deny all responsibility (!), I have multimeter so can have a prod about in the connections to the cable to see if ours is fed by c.12volts and, if so, could buy one of these and replace it myself.
To be honest, I'm surprised that this model is still available. I couldn't find anything of the same appearance elsewhere.
 
Further to my last, the Aico smoke alarm advertised above is the Ei 100R 100.
The old one presently installed, now I look more closely, is numbered Ei 100R 3N and has four conductors connected to four of six available terminals, so I'm not sure whether the two are compatible.
I have emailed Aico for their advice.
 
Be the same , terminals 12+ / 0v ....relay C /NO/ NC and IC for interlink with other units of the same
 
sparkymarka said:
Be the same , terminals 12+ / 0v ....relay C /NO/ NC and IC for interlink with other units of the same
Click to expand...
Yes, I think you're right, though I didn't make a note of all the details.
The thing is that there are no other interlinked units, yet the other connectors are still connected.
Perhaps they're used for the intruder alarm to check function of the smoke alarm.
I'll admit that I know nothing of intruder alarm wiring, so I'd be best asking the alarm company to take a look, although they're not cheap!
 
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