- Posted on
Fri Apr 05, 2024 5:30 pm
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Radjin
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- Posts: 151
- Joined: May 13, 2015
I use the Emerson Sense thermostats, six of them in fact, WiFi. I have a PSP SAK-60 load management module on each air handler. Upon a power outage, the SAK-60 modules return in the off state under generator power, keeping the HVAC units powered down for a set time, then reenergized one minute apart. However when the utility power returns, the ATS units will attempt a rough sync then transfer power back to utility, the SAK-60 modules don’t get shut down so do not start the off timer. There’s almost always a voltage, frequency mismatch that most devices can absorb. Scroll compressors not so well. It probably would be better if the break-before-make in the ATS would have a longer open time.
I, many times, had issues with z-wave and power cycles. Perhaps a longer off time between transitions might help. If you bought a small UPS and plugged in a 24v transformer to the c-wire for your thermostats, that might keep them alive and better protected from any power quality issues. My trick wouldn’t work for you if your thermostats stop communicating. If you do keep your thermostats powered, and one called for heat/cool, it simply sends voltage to an input and your HVAC unit should enter that mode as soon as it is powered up and goes through its purge/delay or whatever they call it on your system.
Edit: After installing and testing my Insteon micro switch it occurred to me that any wireless device would likely fail as the signal probably could not get through the metal enclosure, not to mention, in my case, two brick and three sheetrock insulated walls. Insteon uses two forms of communication, the primary through the house wiring, which works for me at 600’ away, and a wireless backup with a range of about 100’, open space. Just something to consider if you use a device to monitor utility power to protect equipment.
Last edited by
Radjin on Mon Apr 22, 2024 7:38 pm, edited 1 time in total.
It's not rocket science...