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What are the 4 speeds of fan? can you change the "fan on" to a lower speed?

Post created: 2013-03-28 Type of Equipment: Furnace Views: 514

This question was created on the page: https://www.furnacecompare.com/furnaces/trane/xb90.html.

On 2013-03-29 JB wrote:

Not sure why you need to lower the fan speed, but the manual suggests merely setting the thermostat and allowing it and the furnace to manage heating for optimal efficiency. As it reads:

"Save energy by letting the thermostat do its job. Once you set the thermostat, keep subsequent adjustments to a minimum. Adjust it only when a new program is needed."

And then it says:

"9. AIR CIRCULATION – To ensure increased comfort, the blower on this unit may be operated continuously for both heating and cooling. This will result in constantly filtered air and aid in maintaining more even temperatures by avoiding temperature stratification throughout the conditioned area.

To accomplish constant air circulation, set your comfort control fan selector to

“ON.” Continuous fan mode during COOLING operation may not be appropriate in humid climates. If the indoor air exceeds 60% relative humidity or simply feels uncomfortably humid, it is recommended that the fan only be used in the “AUTO” mode."

Therefore, if you are having problems with the fan, especially if they have occurred recently, there is a chance that there is a repair that needs to be made rather than simply adjusting the fan setting down. The first thing to so is check to see if you are getting an error code, which should be indicated by one or two blinking lights or an LED display. The owner manual or a chart on the furnace should indicate how to read these codes and what they mean.

If no error code, or even if there is, it is recommended to call in a certified HVAC tech to properly diagnose the problem and correct it.

To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present.  To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.

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