The ornamental design for an irrigationcontrolunit, as shown and described.
FIG. 1 is a back view of an irrigation control unit in accordance with an embodiment of the present invention;
FIG. 2 is a bottom view of an irrigation control unit of FIG. 1;
FIG. 3 is a front view of an irrigation control unit of FIG. 1;
FIG. 4 is a perspective view of an irrigation control unit of FIG. 1;
FIG. 5 is a left side view of an irrigation control unit of FIG. 1;
FIG. 6 is a right side view of an irrigation control unit of FIG. 1; and,
FIG. 7 is a top view of an irrigation control unit of FIG. 1.
The broken lines of FIGS. 1-7 are illustrative of the visible environmental structure of an irrigation control unit and form no part of the claimed design.