Using Low fan speed on Central heating system


Old 01-12-11, 10:24 AM
David Kantor's Avatar
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Join Date: Jan 2011
Location: USA
Posts: 2
Using Low fan speed on Central heating system

Client wants to lower fan speed (doesn't like fan noise) on heating mode. Trane circuit board has chart for placing fan leads which DOES NOT include using the low speed fan tap. Any problems using it anyway? Will plenum overheat (don't think so in my opinion).
The board has three positions for the three (speed) wires from the fan: Heat, Park, Park. currently heat is using the middle speed wire for the fan.

Dont' want to create a safety hazard but want to help my client. Any thoughts?
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Old 01-18-11, 04:37 AM
Join Date: Oct 2010
Location: United States
Posts: 66
The only way to test and be sure is to measure the temperature difference across the heat exchanger and make sure that its within the manufacturer's specs. You can try it anyway but if it gets too hot the furnace is going to shut down on high limit.

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