Quote:
Originally Posted by Servicetech
The high limit is in place to prevent the furnace from overheating. Lowering the BTU won't cause an issue with the limit tripping. Lowering input lowers efficiency to some extent because the heat exchanger becomes oversized realtive to BTU input.
I'd look for another furnace. Shop around and you might find a bargian.
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An oversized heat exchanger would be more efficient in steady state operation, but blanking off one of the burners will not give you an oversized heat exchanger since you'll only be using part of it. What would is downsizing the burner nozzles (or otherwise reducing the fuel flow) and then somehow adjusting the airflow to maintain the correct mixture. (I think you would then have to slow down the air handler to avoid condensation and corrosion, but I'm not sure.)
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