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Pump Control Based on OA
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![Matt_49](https://secure.gravatar.com/avatar/f8c656aec1bf49d1ef4cf4d0bc94b5ec/?default=https%3A%2F%2Fvanillicon.com%2Fe70453ddd1fe44cf2809da9edc1f4eb4_200.png&rating=g&size=200)
Matt_49
Member Posts: 4
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?
Does anyone know of a controller that will work?
0
Comments
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Johnson A419
What about a simple setpoint controller like the A419?0 -
That or a Ranco ETC
Anything simple as these will work. I prefer external thermistor sensors. The Ranco ETC also has a two-stage model so you can set it up in a variety of ways."If you do not know the answer, say, "I do not know the answer", and you will be correct!"
-Ernie White, my Dad0
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