My system is several years old (Lenox XP17 - 030 -230 ic, Heat Pump, 16.2 SEER, 2.5 Ton, R-410A, DLSC Series and Lenox CBX40UHV Air Handler). I believe this is the communicating Variable Speed Fan type.
From Lenox - Variable-Speed Blower Motor
High efficiency multi-speed blower motor maintains specified air volumes up to a maximum of 0.8 in. w.g. total external static. Multi-speed operation is achieved by the use of an ECM (Electronically Commutated Motor) motor. Allows cooling ramping profiles (field selectable) for enhanced
dehumidification. Motor accelerates and decelerates gradually, reducing start-up and shut-down sound. Leadless blower motor features simple plug-in connections. Motor is controlled by the iComfort® Communicating control that allows blower to operate at two of eight air volumes or speeds available. Speeds may be field selected on iComfort® Communicating control depending on size of air handler and air volume desired. See blower performance tables.
I havent found a thermostat (other than proprietary Lenox) that handles the variable speed. Do I have this right?