Route valve wires between control valve location and controller.
At valves, attach a common wire to either solenoid wire of all valves. This is most commonly a white colored wire. Attach a separate control wire to the remaining wire of each valve. All wire splice connections should be done using waterproof connectors.
Route valve wires through the conduit and attach conduit to one of the openings on the bottom of the cabinet.
Strip ½" (13 mm) of insulation from ends of all wires. Secure the valve common wire to “COM” (Common) terminal. Attach all individual valve control wires to the appropriate station terminals.
Common terminal screw has moved from base module and is now below the sensor terminals. Do not connect the incoming common wires to the PM/V terminal.
On the older style Pro-C controller (green buttons) the common terminal is located on the main module.