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Integrating smoke alarms


adam333

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Wiring directly into a smoke alarm is a bad idea.

 

They're a rated safety device, and by rewiring one, you're removing the rating, which in theory could have consequences.

 

Firex offers a relay designed specifically for what you're trying to do:

 

http://www.electricbargainstores.com/product-p/firex-501.htm

 

You wire it the same as any of the fire alarms, and it has outputs for an automation (or other) system.

 

RyanE

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First of all, since you're wiring it as a contact in on the Control4 system, you're not using the relay output to power a 120V device.

 

That means, don't wire the blue 'COM' wire to the black wire.  It should be +12V from the controller.

 

The NO (Orange) wire should be wired to a contact input ('SIG') on the Control4 system.  The NC (Yellow) wire should be not connected.

 

I think...

 

:)

 

RyanE

 

Edited to Add: No, they don't go to the NC / NO terminals on the Control4 system.  NC/NO/COM on the Control4 system are for a relay output.  You want to wire this to the contact *input* on the Control4 system.

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I believe it should go like this:

 

(relay module)  (Control4 Controller)

Blue (COM)   --> C4 +12V

Orange (NO)  --> C4 SIG input

Yellow (NC) --> Unused

Grey (+9V)  --> Unused

 

You use the Control4's own +12V to it's SIG input to indicate smoke.  No +12V, no smoke.

 

The reason you use Control4's +12V is that it's referenced to Control4's internal ground.  The +9V from the module is not referenced to Control4's ground, so won't likely work.

 

RyanE

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For the +9V to work, you'd have to also have a GND output from the module, which you would tie to Control4's GND contact.

 

As this is a 'dry relay' output, you supply the +12V from Control4, it goes back into the SIG, that's your circuit.

 

RyanE

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Yes, you *could* use the yellow wire to indicate that it's not in alarm, but what's the point?  It's a non-latching relay.

 

If the NO pair is not closed, the NC pair is.

 

And if you're wiring it up for 'confirmation' as proposed, the yellow wire does not *go* to NC, it *is* NC.  It would have to be wired to a different 'SIG' input.

 

RyanE

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