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Old 12-26-2010, 11:14 PM   #1
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How to size circ pump


I've recently posted about my new Triangle Tube gas boiler. The HVAC installer put a taco 3-speed circulator on my secondary zone. How do I know what speed to set it on?

He set it on the middle speed. The delta between supply and return is usually 10 degrees or less...isn't that too low?

Does having the pump move the water too fast somehow lower the efficiency of the boiler (as well as use more electricity to run?).

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Old 12-30-2010, 08:07 AM   #2
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How to size circ pump


Any ideas? Thanks.

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Old 12-30-2010, 03:58 PM   #3
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How to size circ pump


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Originally Posted by secutanudu
I've recently posted about my new Triangle Tube gas boiler. The HVAC installer put a taco 3-speed circulator on my secondary zone. How do I know what speed to set it on?

He set it on the middle speed. The delta between supply and return is usually 10 degrees or less...isn't that too low?

Does having the pump move the water too fast somehow lower the efficiency of the boiler (as well as use more electricity to run?).
Slow it down or clean your baseboards and see if that help.
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Old 12-30-2010, 03:59 PM   #4
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How to size circ pump


What do you mean by "helps"? Is a 10-degree difference too small?
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Old 12-30-2010, 04:27 PM   #5
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How to size circ pump


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Originally Posted by secutanudu View Post
What do you mean by "helps"? Is a 10-degree difference too small?
Ayuh,... The higher the delta, the more heat left in the area,...
10 can be Great, or Good, or Ok, depending on the size of the loop, 'n the load on it, as well as the type of radation used..

You obviously can measure the delta, so try different things to find the Best effiency for your application...
Might be Hi-speed, or Low-speed, or where it is...
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