Attributes . Conventional - RCa, Rha, X, aux, W1, W2, Y1, Y2, AS, AS, OS, OS, G, T3, T4, T5, T6, T7, W3, Y3, HS, HC, HP, M, M; Heat Pump - RCa, RHa, X, aux, O/B, W1, Y1, Y2, AS, AS, OS, OS, G, T3, T4, T5, T6, T7, W2, HS, HC, HP, M, M . Names