Trane XL15i AC with variable fan motor
My installer tells me that my single stage 4 ton XL15i AC has a variable fan motor (2800 sq. ft., 2 story, new windows house in NJ). My Trane brochure indicates that the 15i does not have a variable fan motor (they come with the 16i). If the variable fan motor is present in my 15i and it is superior, I'm not sure why Trane would not list it as present in the brochure. (I also have an XV95 2-stage variable speed furnace).
What is the benefit of having a variable AC fan motor on a 1 stage AC?
Here is the info directly from the fan motor.
ge ecm motors, 1/3 hp, 850/520 RPM
model 5SME39HL HY71