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Shazam! it works. I wired it as above and it works great. That trim pot is really sensitive. At minimum setting it's about a 15 second shut off delay. After turning the trim pot an almost imperceptible amount it goes to a one minute delay.

Paul, help Paul, I received my delay off circuit board today. I'm not sure how to wire this up with just the flow switch and delay. On the delay circuit board: Line power to AC In. AC out to the recirc pump. SW to the flowswitch. That's what the diagram shows for the delay circuit...

I'll keep looking - thanks

Paul, I don't have an expansion bladder. I see your point - there should be no delay (unless the laws of nature have changed). I will install the switch on the cold side simply due to much easier access. Your source for the delay off circuit is a good one. I had looked everywhere and...

Paul, thanks for the quick reply. I was hoping you were still out there. I have followed your project for some time now. My plan for now is to install just the flow switch and delay timer. I haven't yet found a reasonably priced aquastat (immersion type). Do you feel that there is flow...

I have a recirc system with return line. The gas usage is huge if the timer is one for even 4-6 hours per day. I want to install a flow switch/delay off timer system similar to Prygaard's diagram below. I have read his posts and he changed the diagram over time. Should the flow switch...