Should the lead pump not be able to keep up, perhaps a check valve on the non-running pump has failed, the lever will rise to a second stage where both sets of contacts close. This causes both pumps to run until the upper collar switches them off. They don't alternate when this ocurrs
Joe
This is what I was looking for. Four high rises we work in have them. 2) 1/4HP motors 115V. 3 floats. Primary, lag and alarm. However when checking with meter, the floats are working in tandem. The pumps alternate but do not run simultaneously.
