Mike Lamb Posted September 11, 2020 Report Share Posted September 11, 2020 I have never tested the emergency shutoff switch installed in the pan beneath the AC air handler/furnace until recently. I assume if you lift the float the system should shut down including the fan. The last two I checked the fan did not shut off. Should everything shut down immediately? Quote Link to comment Share on other sites More sharing options...
Marc Posted September 11, 2020 Report Share Posted September 11, 2020 2 hours ago, Mike Lamb said: I have never tested the emergency shutoff switch installed in the pan beneath the AC air handler/furnace until recently. I assume if you lift the float the system should shut down including the fan. The last two I checked the fan did not shut off. Should everything shut down immediately? Only the outdoor section. Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted September 11, 2020 Report Share Posted September 11, 2020 How long did you engage the switch? Many newer systems have a fan-off delay. Quote Link to comment Share on other sites More sharing options...
Mike Lamb Posted September 11, 2020 Author Report Share Posted September 11, 2020 27 minutes ago, Bill Kibbel said: How long did you engage the switch? Many newer systems have a fan-off delay. Not long. A couple seconds. Both inspections happened to be Frigidaire 15+ years. Marc, so if only the compressor shuts down I would need to stick something under the float and then go outside. ☹️ Quote Link to comment Share on other sites More sharing options...
Marc Posted September 11, 2020 Report Share Posted September 11, 2020 (edited) 3 hours ago, Mike Lamb said: Not long. A couple seconds. Both inspections happened to be Frigidaire 15+ years. Marc, so if only the compressor shuts down I would need to stick something under the float and then go outside. ☹️ If you want to confirm that the float switch works, yes. If I wanted to check it, and the AC is already running, I'd just stick my screwdriver under the float (gently), come back later after I finish the attic inspection and touch the vapor refrigerant line (not too close to the evap coil) to see if it's still cold. It should warm up when the outdoor section goes off. Pull the screwdriver out, give it 30 seconds and it should become cold again. Edited September 11, 2020 by Marc 1 Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted September 11, 2020 Report Share Posted September 11, 2020 Most, if not all installers around here wire the switch to shut down the entire system. Frigidaire is Nordyne, most of which have a factory set fan-off delay. I think it's 90 seconds. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted September 12, 2020 Report Share Posted September 12, 2020 If it's a condensing furnace, the switch should shut that off as well. Quote Link to comment Share on other sites More sharing options...
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