Delcos 3100 | Wiring Diagram

Before starting any wiring, you must adhere to strict safety protocols:

If your system is integrated into a factory network, additional wiring is required for: DELCOS 3100 Controller Manual | PDF | Energy Conservation delcos 3100 wiring diagram

By using the old as a "wire-for-wire" map, you can install a new PLC in hours instead of days—simply land each existing wire on a corresponding new terminal. Before starting any wiring, you must adhere to

| Symptom | Likely Wiring Fault | | :--- | :--- | | Inducer never runs | No 120V to IND terminal or bad limit string. | | Spark but no pilot | Missing 24V at PV terminal. Check MV/PV common return. | | Pilot lights but no main valve | MV terminal not sending 24V. Check gas valve coil resistance (20-60 ohms). | | Lockout (no spark) | Poor ground (GND). Module requires chassis ground for spark return. | | Intermittent flame loss | Loose SENSE wire or high voltage wire routed too close to sense wire. | Check MV/PV common return

Standard connections for the controller's internal electronics.

The motor starter coil (labeled M1 ) connects to Output Card Slot 3, Terminal 8 . The other side of the coil goes to L2 (Neutral) . The diagram also notes: "Use snubber across M1 coil (Delcos P/N 234-01)." This is a critical detail—ignoring it can cause false triggering.