I recently had my installer put in a 4 ton Trane XL16i with a matching variable speed furnace (XL90) and air handler for my first floor and a similar setup with a 3 ton AC for my second floor.
How can I determine if the 2nd stage of the XL16 is operating correctly? The feel of the vents and sound of the unit do not appear to change after the thermostat shows the indicator change for stage 2.
The dip switches appear to be set correctly after I changed it from 3.5 ton to 4 ton for the first floor.
Any tips before I have the tech come back out??