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Constant circulation on secondary pump yes or no??

World Plumber
World Plumber Member Posts: 389
I'm mulling the heating characteristics of this building over in my mind. By putting the pump on constant circulation with an aquastat to turn the pump on when the water hit 130 and off at 90 I was able to get the cold sections of the building to balance out. Does any one see a problem with putting the second pump in with the thermostatic valve in the primary circuit. and attaching my secondary pump control aquastat to the common pipe so it senses when the boiler is heating, but will continue to run and move the large mass of water around to equalize the temperature in the building. I only have my loop piped to the bypass of the thermostatic valve. So I was thinking maybe I should put 2 tees in and add the second pump now. So the heat complaints from the back upper floors don't return. Does anyone see a problem with that. The thermostatic valve would bypass to keep the boiler at 140 no matter the load protecting the boiler and we would still be able to move the heated mass of water around to get the most heating value out of it and heat the slower heating rooms.


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