Gary, I am not sure how your return lines are set, but if you have 1 return pump for 2 return lines till the tank, i do not see why there should not be a valve in the return line.Well, I was scrolling through Facebook today and saw a picture of my sump on the R2R page. It linked back to a thread entitled - Fix My Return Pump Problem. Not really sure why they used my sump as an example, except that there are two Vectra M-1s visible in the picture. Anyway, glad they did, because it saved me from redoing some plumbing. (See my last post above).
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So anyway, I went to the thread and it involved a problem with an Vectra return pump, or plumbing. During the conversation it was noted that you shouldn't use a valve on the return line with the Vectra, use the controller to adjust the speed of the pump. This is something that I know, but because this build is taking so long, I totally didn't think about that while I was trying to plumb the return into the SeaSwirls to include a gate valve. So, back to the drawing board there. Glad I didn't permanently glue it up. Almost another mistake. ;Wideyed
You will only have to make sure that you do not close both more then 50% at the same time. This to have the outlets not smaller then the pipe diameter at the pump so you can ensure free flow in the line at all times.

And I have it set to alert me if temps rise or fall, but I let the heaters control themselves.
I will use it to control the MP-4os with the WXM module, control heaters, chiller, flow monitoring on each return, ATS, frag tank and UV. Leak detectors and backup to turn off my skimmer when the skimmate locker fails to shut it off (which it has done several times). I may chicken out on using the ATO though. I think I would prefer to use my Tunze instead. Plus anything else I can think of.



