Should be able to do it in parallel. Remember this output is horn speaker by default. So it will need reprogramming.
Run out of outputs on a Bosch SOL 2000 panel due to needing onboard dry contact relay to act as a zone follower for a strobe light (garage door open warning) and was wondering if the internal piezo screamer which is usually setup on the relay output can be paralleled or series connected with external horn siren on output 1 ?
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Should be able to do it in parallel. Remember this output is horn speaker by default. So it will need reprogramming.
avenno (10-07-19)
Cheers secure, a bit more digging and I think I have it figured out.
I need to change the horn/strobe box to a Firefly slimline type (12V siren piezo) then I can connect the new ext siren and int piezo in parallel with a 3k3 resistor in parallel also (which the current int piezo already has). This frees up the onboard relay to use as zone follower output for a garage door warning strobe.
One other question regards smoke zone, can you use the zone double of the physical input the smokeys are on or do you lose the capability due to smokeys being NO?
You can still zone double. Best to use smokies with NC
avenno (10-07-19)
Cheers secure
If you zone double using a NO device by just placing the resistor for the NO device in parallel with its contacts to seal the zone, then when that device goes into alarm, it will short-circuit the zone input terminals on the PCB, causing both the high and low zones to trigger. So yes, in theory you can zone-double using a NO device this way, but it is not good practice. Most smoke detectors have both NO and NC contacts now, so it shouldn't be a problem to use the NC contacts.
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