I've been recording data for 5 days on my mom's new Trane unit and her house experiences normal range of 118.1 - 124.3 volts as min - max values, on the average
Normally, the minimum and maximum values are not occurring during the same hour:minute of the day, they are separated by several hours
However, she also had two(2) events where the low voltage was recorded as 113.2 & 113.7 volts and high voltage at 124.9 & 125.2 and they occurred within 1 second of each other.
When these two events happened, on both occasions the stage 2 compressor was running, house lights, tv, phones, compressor, goes off, then everything comes back on one second later but the dual stage Trane starts running ECM only and turns on stage 1 compressor (does not even wait for the time delay from the thermostat of 5 minutes)
What is to be expected during such an event? Apart from asking the local power utility to check the condition of the transformer closest to mom's house, what else may I do?
There is nothing I can think of at the moment to cause the system to stop as the blackout is too short in duration to kick in the 5 min delay and since it lasts such a brief period there is likely no fear of overheating the components.