4 Ton 3 Phase indoor Wiring Diagram with PCB this Diagram is for NON Inverter AC . you can learn easily with diagram. Diagram with PCB You should read it : Gree GS-12UG3S Indoor Wiring Diagram (1 ton) Outdoor Wiring with Combine Capacitor Diagram Non Inerter 4 Ton Outdoor Wiring Diagram Mcquay 4 Ton Outdoor