Distinguish a fire door drop-test reset from a fusible-link replacement, and know when each applies.

Steps

1. Recognize that a 'reset' returns a door to its normal open, held position after a successful drop test — it does not involve replacing hardware.
2. Recognize that fusible-link replacement is a separate maintenance action, needed when a link is corroded, painted over, coated with particulate, or has already separated.
3. Reference DASMA's fusible-link technical data sheet for link selection guidance: match the load rating (in pounds) and the temperature rating to the ambient conditions at the door location.
4. Confirm with the door manufacturer's instructions and the current NFPA 80 edition for required and prohibited fusible-link mounting locations before replacing one.
5. If a link is painted, immediately replace it — do not attempt to clean or reuse it.
6. Where a sprinkler system and a fusible link both protect the same opening, verify the door's link activation temperature is lower than the sprinkler head's activation temperature so the door closes first.