System Application 24 Vac systems Gas, Oil, Electric Warm Air Hot Coil Gas, Oil, Electric Hydronic or Steam Gravity Systems Stages Heat Cool Up to Heat Pump or Conventional Power Method Hardwired Terminal Designations RC, R, C, W, W2 - AUX, Y, Y2, O B, G, K, E, L A, S, S.

System Application 24 Vac systems Gas, Oil, Electric Warm Air Hot Coil Gas, Oil, Electric Hydronic or Steam Gravity Systems Stages Heat Cool Up to Heat Pump or Conventional Power Method Hardwired Terminal Designations RC, R, C, W, W2 - AUX, Y, Y2, O B, G, K, E, L A, S, S.

System Application Gas Electric or Oil Heat Pump Stages Heat Cool Power Method Hardwired or Battery Terminal Designations Rh, Rc, C, Y, W, G, B, O Description 4.