Fire Damper Actuators

[IAmSparkytus!]

Hello

Working on a site with dampers fitted on the ducting which need fire shut offs connected to the fire panel via an actuator.

The actuators have 4 contacts “Damper Closed NO and NC” and “Damper Open NO and NC”.

Presuming they need a NC contact so the actuator operates and closes the damper when the alarm goes off but not sure which NC contact to utilise.

Any insight appreciated.

Thanks.

 

[IAmSparkytus!]

Sorry for this but…bump

 

[TheatreSparks]

Hi, It sounds that what you have described are the monitoring contacts that would send a signal to a Building Management System or a mimic somewhere that indicate the position of the dampers at any point of time. There should be terminals for the coil, possibly 24v, which would be fed from a power supply unit which would have a fire alarm output module which would change status when the alarm sounds. It may well be a NC set of contacts in the fire alarm interface which hold the dampers open against a fail safe spring so if it looses power it will automatically close.

 

[IAmSparkytus!]

Hi thanks for the reply

Yes so it’s a 24v power supply required, wasn’t sure if there was anything specific that would be required or would a bog standard 24v PSU suffice?

So if the 6 cores are for signalling as you say, would it be feasible to switch the power going to the 24v PSU through a contactor with the coil being supplied by an auxiliary relay on the fire panel?

Thansk

 

[TheatreSparks]

Hi thanks for the reply

Yes so it’s a 24v power supply required, wasn’t sure if there was anything specific that would be required or would a bog standard 24v PSU suffice?

So if the 6 cores are for signalling as you say, would it be feasible to switch the power going to the 24v PSU through a contactor with the coil being supplied by an auxiliary relay on the fire panel?

Thansk

As far as I am aware, any 24v power supply would be suitable, but in particular one designed for fire alarm and includes facilites for back-up batteries to be fitted as otherwise you would need to reset the unit after a power supply.

Yes, the unit would be switched via a relay in circuit with the 24v line off the aux relay on the fire alarm panel, assuming that is a convienent place to pick up a switched contact.

Unless you need monitoring you would not need to connect the 6 wires to anything.