The Rheem-Ruud 47-102684-194 Defrost Control Board Kit is used in the defrost control circuit of home heating and cooling systems. This control board which is aimed at controlling the defrosting process assists in minimizing the formation of ice on the evaporator coils hence increasing the efficiency as well as effectiveness of the system. This comes in the width and length measuremen... https://www.partshnc.com/47-102684-194-rheem-ruud-defrost-control-board-kit