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Pump Control Based on OA

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Matt_49
Matt_49 Member Posts: 4
in THE MAIN WALL
I have a hot water heating system with two constant speed pumps set up in a lead lag control fashion. No DDC, all stand-alone controls. During very cold days, when all the control valves open, I get a very large supply and return water delta T and not enough heating capacity. I would like to use a controller that will bring on the second pump to run in parallel based on outdoor air temp.

Does anyone know of a controller that will work?
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