Abstract: An electric convection oven is provided wherein a squirrel cage fan is used to circulate air through a circular bank of heating coils surrounding the fan and into the oven. The coils wrap around the fan and are spaced from each other so that air from the fan will pass through the coils and into the oven. The fan is provided with a concave centrally located plate for drawing air from within the oven into the fan for recirculation through the heating coils and to return to the oven.

Abstract: An automatic deliming process for a steam oven cooker is described. The process initiates a deliming procedure after a predetermined time of normal operation, which period of time is determined by the hardness of the water in the local area. Upon the expiration of this period of time a microprocessor signals an operator to shut down normal operation of the oven, and initiate the deliming process. The microprocessor then activates a peristaltic pump which injects a predetermined quantity of deliming liquid from an external reservoir into the generator. After the deliming time has passed and the generator contents have cooled to 140° F. the microprocessor automatically activates a drain pump to drain the deliming solution from the generator. Subsequently the microprocessor activates a fill-solenoid opening and inlet from a reservoir of rinse water into the generator to rinse the same. The microprocessor then again opens the drain to drain the rinse water, and normal operation is resumed.