The ornamental design for electronic refrigeration controller, substantially as shown.
FIG. 1 is a front, top, right-hand side perspective view of an electronic refrigeration controller comprising a new, original and ornamental design;
FIG. 2 is a front view thereof;
FIG. 3 is a left-hand side view thereof;
FIG. 4 is a right-hand side view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines are included for the purpose of illustrating portions of the electronic refrigeration controller that form no part of the claimed design.