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Old 03-05-2012, 08:46 PM   #1
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blower speed on heat call


On a heat call, is it better to have a lower CFM or a higher one? factory default on my furnace is the "medium" speed for heat and high cfm for cool calls.. the dealer put it on high speed for heat and cool, same they did with our old furnace... I always thought you wanted it lower speed on a heat call? is this good or so so pratice? seeing the factory suggest medium speed

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Old 03-05-2012, 08:48 PM   #2
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blower speed on heat call


It comes down to what temp rise is.

To little air flow can cause an overheating problem

To much air flow doesn't transfer heat.

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Old 03-05-2012, 08:52 PM   #3
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blower speed on heat call


yes you must have the proper temp rise across heat exchanger for proper and safe operation...... so to answer you question..its better to have the proper temp rise based on the needed cfm to operate your furnace in a safe manner
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Old 03-05-2012, 08:56 PM   #4
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blower speed on heat call


yeah, well this dealer has the idea in their head faster is better.. they don't seem to care about checking rise and cfm / velocity... so im stuck making sure this is all right myself ugh... guess I will have to do the rise check myself and see what the specs are
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Old 03-05-2012, 09:52 PM   #5
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blower speed on heat call


Quote:
Originally Posted by BlueBSH View Post
yeah, well this dealer has the idea in their head faster is better.. they don't seem to care about checking rise and cfm / velocity... so im stuck making sure this is all right myself ugh... guess I will have to do the rise check myself and see what the specs are
measure tempeture in plemun hot air....measure tempeture in return air..subtract cold air from hot air....temp /rise..look at tag on furnace it will tell you what temp rise should be...
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Old 03-06-2012, 06:19 AM   #6
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blower speed on heat call


Blue,in most cases a higher speed is better. It makes the flue gasses cooler which increases the eff. slightly on your 90%+ furnace by condensing more moisture out of the gasses. Each pound of additional water condensed adds over 1000 BTU to the output with no added fuel. It also makes the exterior of the heat exchanger cooler which transfers heat from the inside of the exchanger faster using the same amount of fuel, equating to another increase in efficiency.

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