6/29/2023 0 Comments Download red wire smoke detector![]() The fire alarm code helps in the resetting.īy code, all fire alarm devices are required to power up in the normal or stand-by condition - not in alarm condition. Just like a pull station or waterflow switch going into alarm, the relay contacts "short out" the zone wires.Ī 4-wire smoke detector, like a 2-wire smoke detector, has to be resettable. Like a pull station or a waterflow switch, the relay contacts (the output of the detector) are connected to the building's Class B or Class A input zone wiring (Initiating Device Circuit or IDC). To send the alarm to the fire alarm panel, the 4-wire smoke detector uses normally open relay contacts.
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