Sure, I’ll try to explain it. To make sure we’re on the same page, the vessels from left to right are the HLT, Mash Tun, and Kettle. The left pump I’ll call Pump 1 and the right pump is Pump 2. Click
here to see the picture my description refers to.
Pump 1 takes a suction from the bottom of the HLT and pumps to the top of the Mash Tun.
Pump 2 has 3 main pumping paths. First, it takes a suction from the bottom of the MT and pumps back into the top of the MT for recirc. Second, it takes a suction from the MT and pumps into the top of the kettle during the sparge. Third, it takes a suction from the bottom of the kettle and pumps through my counter flow chiller (not pictured). The chiller hooks up to the quick disconnects on the right side of the picture. The beer-in end of the chiller connects to the bottom QD. From the chiller I can go directly into carboys, or I can connect the beer out end of the chiller to the top QD and go back into the top of the kettle (for whirlpooling).
Several other pumping paths are possible, which are handy for cleaning. I can pump hot water or PBW through any path in the system. There are also drain valves on the suction side of both pumps.
Any more questions, let me know.