How to Replace a Smoke Detector System

Smoke alarms are connected to each other so that if one device detects smoke in one location, other alarms will sound in a second or third location. Sometimes you'll want to replace a smoke alarm if it has failed in testing. Smoke alarms should be replaced every 10 years anyway, so every 10 years you should replace them system-wide. The wiring will not need replacing. Luckily, they use a quick release connector.

Same make and model smoke detectors

Instructions

- 1
  Open the battery compartment of each new detector and insert a 9V battery. Press the test button for a few seconds on each and the alarm will sound. This tells youl that the battery is good.
- 2
  Turn the power off at the circuit breaker.
- 3
  Discard the original alarms. They unscrew a quarter turn from the mounting base. Unclip the quick-connect power supply.
- 4
  Reattach the quick-connect power connectors to the new detectors. Line the connectors up and slide them in just like a plug. You'll see there's only one way they can go. Quick connects are unique to the make and model, so don't change brands from the original system.
- 5
  Insert the locking pin into the lock on the base and reattach the smoke detectors to the mounting brackets. The detector will lock as the pin head fits into a notch.
- 6
  Re-establish power to the circuit.
- 7
  Press the Test/Silence button. All the smoke detectors interconnected should briefly sound, and the green light on the replacement unit should remain lit. Repeat on each detector.

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