Our furnace came with the house and seems to be an upgrade they did 10-15 back. it is somewhat modern as it vents with PVC pipe here are to photos one of the works and the other is this pump box that sits behind the furnace. During the cold spell we had below zero the furnace ran a lot but this pump ran 24/7 and it has water dripping out of it. Now that the temp has warmed up into 30s it seems like it shut off. What does it do? How do I know if it is working correctly? Do I even need it? How do I know it is installed correctly? It is wired into the Jbox in the lower right side of the one photo. Has tubes and PVC running to it.