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How to effectively exercise stagnant water in open system
I am switching out a leaky hot water tank in a small cottage that is currently using a single domestic tank for space heating as well. Tank has side ports that run to a manifold with four PEX runs that serve the wall blower units. A simple control strategy is set up right now with the Tstats wired into a transformer and a small switch relay serves the zone actuators and the single circ pump. The homeowner doesn't want to incur the expense of making the heating side into a closed loop. As a intermediate upgrade, I would like to adapt the system to exercise the water periodically to prevent the buildup of stagnant water in the heating loops.
I was considering using a Taco SR504 switch relay with a plug in PC610 exercise card, however I have never used the plug in card before.
The big question I have is how do I effectively set up the controls to exercise the water through the entire system? Does the PC610 allow for the zones to open and close? And if they all open, what is to keep the system from simply circulating through the shortest loop and leaving the other three to stagnate? Does this control cycle through the different zones as well?
Any feedback or different strategies that you might suggest?