I recently had a Carrier "Comfort" Series 24ACB7 condenser installed with a performance 'N' coil (CNPVP), performance Boost 80 Gas Furnace, and a Honeywell VisionPro TH8000 thermostat (TH8321U). The air conditioner is a 5 ton unit with a 2 stage Copeland scroll (16 SEER).
I would like to know how you can tell if the outside conedenser is switching between the first and second stage of compression. Can you hear a relay switch or can you hear the compressor motor pull more load? The outside unit doesn't seem to make more or less noise when running on the first stage vs. the second.
The inside fan switches between a low and high speed which is very noticable and you can hear the thermostat 'click' when it sends a signal to turn on the second stage and increase the internal fan speed.