What George said.. As far as short cycling, I've found a walk-around for D systems, maybe usable for R. I put an off-delay on the contactor and set for 1-10 minutes. I've done a few 13D tank and pump systems lately and been using a nice panel made by C-H which has this. In fact, I just wired one with a programmable timeclock for weekly runs with the off-delay. You have to be careful with drawing from tanks alongside the pump and relatively zero npsh and use a large enough suction pipe to flood the pump or you will pull a slight vacuum and derate the pump. I haven't measured exact flow vs. pressure of these little D pumps as the inspectors test is piped back into the tank(s) but it looks marginal (using good gauges) in making it's 'published' curve. TD
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