4 wire heat detector 48vdc with relay

The detector that initiated the alarm condition will have its red LED and relaylatched until reset by panel. Two LEDs on each detector provide local 360°visible alarmindication. They flash every six seconds indicating that power is applied and the detector is working properly. The LEDs latch on in alarm.LEDs will be off when a trouble condition exists indicating that the detector sensitivity is outside the listed limit. The detector has an automatic reset function.