Does anyone know if an Infinity system will still fire up the humidifier and ERV even when there is no call for heat for a very long time? In the winter, heat is supplied by radiant, but the home is very tightly insulated and the ERV needs to run...

At first I had the fan and ERV set to auto, but it never ran (without a call for heat?). Now I have the fan at low, and the ERV on auto, and that seems OK, but I don't think the humidifier will run w/o a call for heat. Any suggestions?