Is it OK to dip switch outdoor unit to 4ton with 5ton air handler?

[@gringoloco4570]

Follow up...5ton handler was installed where 4ton unit should've been. Trying to dial down flow as much as possible due to Florida humidity. What does it mean when a speed is off the cfm chart at a given SP? .4 SP shows nothing below speed 3.

[@RockyMountainTesla]

We just had our 3 ton Gree Flexx installed with a 3 ton Air Handler and an 8 kW heat strip as supplemental heat in Calgary, AB. The installer put in a fresh air damper that is supposed to open when heat is called. Our Ecobee/beestat information shows CO2 rising in the evening into the 1600 ppm range from 600-700 range when heat is called at -20°C temperatures. Is this normal or a sign of a bad install?

[@mooch91]

@GREEcomfort What’s the difference between the 4 ton and 5 ton air handlers other than model number? All parts seem identical, motor, coil, etc. And also, does each air handler have 8 or 16 speed settings? Meaning can you use the 4 ton switch settings on a 5 ton air handler if everything else is the same?