Both door holders are fitted with an integral manual release button allowing the door to be closed without operating the fire alarm.
Fire alarm door holder wiring.
The magnetic portion of this device is installed on the wall that meets the open fire door now to tie this whole concept together you will.
In the event of a power failure they release the door to a closed position to keep the facility secure.
This is a piece of class 1 equipment and must be earthed 3.
Electromagnetic door holders and releasers keep doors open until they are released by fire alarm systems remote smoke detectors or other switching devices.
The door holder is an electromagnet a door holder prevents the door from closing because it hangs onto the door using magnetism.
They provide a high holding force.
Depending on your fire alarm installation you may need to install a magnetic door holder at the location of each fire door.
A magnetic door holder is a relatively simple device that when powered typically by 24vdc or 120vac will create a magnetic pull.
Electromagnetic door holder releases are designed for virtually any remote door release applications.
With that said magnetic door holders are used as a convenience to hold doors open during normal operation.
All are reversible for right or left door swing directions.
Wiring them depends on what smoke heat alarms you have in if you have a fire panel unlikely in domestic unless landlord flats then use the open on alarm volts free relays to drop power to magnets if you have mains smoke heat detectors then they need to have an auxillary volts free output so you can use it again to drop power from magnets on alarm.
This equipment must be installed and maintained by a suitably skilled or technically competent person.
En1155 1997 cpd approved floor mounted 24v dc door holder 04390 41.
To close fire doors in an emergency and prevent the spread of fire and smoke.
That much is.
When activated by a fire alarm the magnet shuts off and releases the door.
Making the magnetic field electrical current passes through the coil of the door holder.
Dropping door holder power with loss of ac voltage when designing a fire alarm system you may come across the need for magnetic door holders.
Both versions are supplied with a door mounting keeper plate.
When the fire alarm system detects smoke the current to the door holder turns off allowing the door to close.
Mount the wall plate in an electrical outlet box or use a surface mount box sold separately.
There are no codes nation or state wide that require doors to be held open.
Often this is done on a global basis any alarm will drop power to all door holders but sometimes the door holders may be controlled in groups.
The following are some examples of how you can wire door holders with pros and cons to each example 1.
They must be used in conjunction with closing devices.
Wire these holders directly into your fire alarm system.
For use with doors that already have a closer these holders keep doors open with an electromagnet.
