Fire Alarm Door Holder Requirements

When the fire alarm system detects smoke the current to the door holder turns off allowing the door to close. A door holder prevents the door from closing because it hangs onto the door using magnetism. Now to tie this whole concept together you will need to install the necessary hardware on the fire door itself.

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That much is obvious.

Fire alarm door holder requirements. Depending on your fire alarm installation you may need to install a magnetic door holder at the location of each fire door. The magnetic portion of this device is installed on the wall that meets the open fire door. Yes you are right if you have a fire panel it makes much more sense to tie 24 volt detectors to the panel. Making the magnetic field electrical current passes through the coil of the door holder.

Once the detector senses smoke the fire alarm control unit sends a signal to the relay which then opens the power circuit. The electromagnetic door releases will be energized with the voltage shown at right in the hardware set for this opening. On the fire alarm side you would need a control relay to intercept a switch leg of power to the door holder circuit as well as an initiating device such as a smoke detector to activate the relay. The development of national fire protection association 101 life safety code and smoke detection technology required that smoke detectors release the door holders instead of fusible links.

A magnetic door holder is a relatively simple device that when powered typically by 24vdc or 120vac will create a magnetic pull. From what we have learned if you use 120 volt smokes tied to the door closers they need to have a battery backup and they need to be recharged. Power shall be controlled by the fire control system. It will interrupt the power if alarmed causing the doors to be released thus allowing the door closers to close the doors.