Evolution two-stage · ABCD
ABCD (two-stage scroll, not inverter)
Bryant 187B class. Evolution communicating two-stage. ABCD like 191VAN — but there is no inverter drive and no Y1/Y2 Preferred landing.
Written circuit description only — FieldBench does not redraw maker schematics. Example: R to W closes on a heat call; verify 24V at W1 before you change the IFC.
Open manufacturer PDFEvolution ABCD
187B / Evolution two-stage outdoor. Not 148TAN Preferred.
Infinity / Evolution wall control
Four-wire ABCD. D is 24V hot, not Y.
- ADataData
- BDataData
- C24V common24V
- D24V hot — not a cool call24V
Infinity / Evolution indoor
Same ABCD. Indoor CFM is serial. A Comfort 59SC5 does not belong here.
- ADataData
- BDataData
- C24V common24V
- D24V hot24V
Outdoor communicating drive
ABCD (or the outdoor comm harness). No Y contactor. No dual cap.
- ADataData
- BDataData
- C24V common24V
- D24V hot — still not Y24V
Outdoor line
208/230 through the disconnect to the contactor line side.
- L1LineLine
- L2LineLine
- GNDEquipment groundLine
Landing
- DataStat A/B/C/Dindooroutdoor
Evolution bus. Staging is serial, not Y2.
- LineL1 / L2outdoor
208/230
Prove it
- Evolution event list. The wall control names the outdoor and the stage.
- If someone landed Y1/Y2 because it is two-stage, that is the 148TAN diagram.
Do not
- Do not use the 148TAN Preferred Y1/Y2 diagram on 187B.
- Do not treat this as 191VAN. There is no inverter to reset.
ABCD is the published Evolution control.