We have a new Trane XL16i heat pump system, 4 ton, 410A. I'm wondering what would happen if we were out of town during winter and had an electrical power failure for maybe 48 hours with the outside temperature around 0'F. The house is very well insulated and would not freeze the pipes during that time; but the heat pump would start as soon as the power came back on.
I've been told that most systems have a sump heater to keep the refrigerant from getting too cold and damaging the compressor, but that heater would be inop during the power outage.
Is there danger of damage under those conditions?
If so, is there anything I can do to protect the system?