System Application: Conventional, Heat Pump, Gas, Oil, Electric, Dual Fuel, Boiler, Air-Cooled and Geo-Thermal Heat Pumps; Stages Heat/Cool: 4/2, Inc. 2-Stage Auxiliary Heat; Power Method: Hardwired; Terminal Designations: RC, RH, G, C, Y1, Y2, O/B, W1, W2, PEK; Color: Black; Volts: 24; System Switching: Heat/Cool/Auto; Connected: Yes;