Rain Bird to Orbit Controller – Master Valve Wire on Old Unit

Old Rain Bird has MV terminal; new Orbit does not. Need MV slot?

Only if a wire was connected to MV on the old controller. If no wire on MV, you don’t have a master valve, so Orbit is fine.

Irrigation: Rain Bird ESP "SKIP" on Zones 8–10: Need Controller Model to Diagnose; Water Master 57161: Valve Turns On Briefly Then Repeats Every Minute; Rain Bird ESP‑6: No 110 V Power at Controller – Transformer or Wiring Issue?; Richdel 446PR Hybrid: Zone 2 Runs Continuously Even in Off Position; Toro Vision II: One Zone Shows 24V Constantly But Won't Water; Rain Bird 7RCBI Stops at Zone 1 – Discontinued, Replace with ESP; Rain Bird RC-7A Station Wheel Stopped: Motor or Switch Failed; Rain Bird ESP-6 Shows "8888": Controller Likely Dead, Replace with ESP-Modular; Rain Bird 100-DV Valve Stuck On: Replace Valve Top, Not Just Diaphragm; Diagnosing a Blown Fuse on a Rain Bird ESP-8 with a Master Valve

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