How Does A Smoke Detector Work In An HVAC System? (System Sensor D4120 Duct Smoke Detector)

Friends, this is not a short video but if you watch the whole thing, you will have a better understanding how to troubleshoot and install a smoke detector. I remember being out on the field and being frustrated not knowing how these would work. I don't want that for you. All my knowledge is your knowledge. Share with others and as always, be safe out there.

Only professionals in this trade should attempt to work on live equipment.

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Timecodes
0:00 - Intro
0:12 - What does a Smoke Shutdown do?
1:09 - Closer lookup of the D4120 Duct Smoke Detector
2:18 - Use an external 24-volt source, not the unit's
3:52 - DIP Switches
4:52 - Taking out the Smoke Sensor so it can be cleaned.
8:00 - Air Duct Detector Sampling Tube Placement
11:08 - 0- or 7-minute tamper delay
16:08 - Why the trouble shutdown DIP switch must be in the ON position
20:26 - Understanding normally open (NO) and normally close (NC) contacts
22:20 - Testing the Smoke Detector with continuity
25:28 - Cut the Smoke Detector jumper on control board
30:55 - Testing the Smoke Detector with voltage
35:10 - Triggering the Smoke Detector with smoke
37:40 - You can reset the alarm two ways, one way is using a magnet
39:05 - How to interlock two Smoke Detectors with 2 units
41:53 - Interrupt the R wire (power) going to the Thermostat if no smoke detector taps are on the board
43:21 - Recap