Fire alarm sounder connected to door entry system help please

Ross Harvey · Jul 28, 2014

Hi All

I have door entry system that i installed at a care home. it is a fail safe system but they didnt ask me to coonect to fire alarm system unitl after i had second fixed it all.

Long story short i have connected it (through a relay) to a local fire alarm sounder that gives out 24v on alarm conditions.
This works correctly but the fire panel shows a fault on the sounder system. Is there an easy fix? Maybe connecting a resistor? any help would be appreciated.

Thanks

Andy78 · Jul 28, 2014

I'm no expert on fire alarms systems by any means, but there are usually outputs on the panel PCB to connect to for things like this.
Someone will be able to set you right soon I reckon.

Ross Harvey · Jul 28, 2014

Thanks for your reply.
The reason i have connected to a local sounder is that the fire panel is the other side of the building and not easily wired back from.

telectrix · Jul 28, 2014

maybe a blocking diode would get you out of trouble. however, it's not recommended to modify any fire alarm system without thoroughly considering the implications of failure to operate in case of a fire.

Andy78 · Jul 28, 2014

Like I say, someone more expert than me will have to help you out with this one.

telectrix · Jul 28, 2014

where's tazz when he's wanted.

[ElectriciansForums.net] Fire alarm sounder connected to door entry system help please

Ross Harvey · Jul 28, 2014

telectrix said:
maybe a blocking diode would get you out of trouble. however, it's not recommended to modify any fire alarm system without thoroughly considering the implications of failure to operate in case of a fire.

Is a blocking diode what normally comes with detector bases?

telectrix · Jul 28, 2014

yep. it conducts d.c. one way with a 0.6 volt drop, but blocks the other way. the diode used is selected according to the current requirement. not sure if it will cure your problem though.

Ross Harvey · Jul 28, 2014

telectrix said:
yep. it conducts d.c. one way with a 0.6 volt drop, but blocks the other way. the diode used is selected according to the current requirement. not sure if it will cure your problem though.

Thanks for your reply.

How would i connect that diode? across the positive and neg going to my relay or just on the positive out in series? and would it also stop the relay from operating?

High Tower · Jul 28, 2014

Are you sure it's a conventional fire alarm?

Ross Harvey · Jul 28, 2014

High Tower said:
Are you sure it's a conventional fire alarm?

yeah im sure it is

ayjay · Jul 28, 2014

personally i wouldnt be messing around with a fire alarm in an old folks home
well risky if something goes wrong
lnstall a stand alone sounder

High Tower · Jul 28, 2014

Its not using the sounders, the idea is the the fire alarm releases the mags

Guest77 · Jul 28, 2014

As tel mentioned a diode will do the job, however it isn't the right way and will need to be a very temporary fix, Tazz where are you ??

High Tower · Jul 28, 2014

Yea it needs to be triggered from the panel

tazz · Jul 28, 2014

Connecting any release or shutdown to the sounder circuit, is a breach of regs......reason being, the doors will relock when system is silenced....and must only relock when the system is fully reset. All release, shutdowns must be off panel fire relay, or addressable output unit.
Example, fire alarm activates in nursing home, doors release, then staff member silences system while evacuating...doors relock trapping residence in building

Fire alarm sounder connected to door entry system help please

Ross Harvey

Andy78

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Ross Harvey

telectrix

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Andy78

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telectrix

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Ross Harvey

telectrix

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Ross Harvey

High Tower

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Ross Harvey

ayjay

High Tower

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Guest77

High Tower

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tazz

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