Abstract: An impingement oven (40) includes an upper housing structure (46) forming the exterior of the upper half of the impingement oven and a lower housing structure (48) to mate with the upper housing structure. An interior impingement housing (62) is positioned interior to the upper and lower housing structures (46) and (48). A conveyor (60) extends through the interior impingement housing (62). The inside surfaces of the upper and lower housing structures (46) and (48) cooperate with the interior impingement housing (62) to define upright supply chambers (80a) and (80b) on opposite sides of the impingement oven to direct cooking medium downwardly upon the work products being carried by the conveyor and also upwardly through the porous belt of the conveyor, thereby to thermally process the work products being carried on the conveyor.

Abstract: A method and apparatus for controlling the direction of a defrost device for refrigeration coils includes measuring the current drawn by or the torque produced by a permanent magnet motor, wherein the permanent magnet motor powers a defrost device recurrently back and forth along refrigeration coils and reverses the direction of the permanent magnet motor when the measured current drawn or measured torque produced are at or above a first limit. The method omits the use of switches and sensors to signal when the defrost device is reversed to reduce failures and stoppages.

Abstract: A method and apparatus for controlling the direction of a defrost device for refrigeration coils includes measuring the current drawn by or the torque produced by a permanent magnet motor, wherein the permanent magnet motor powers a defrost device recurrently back and forth along refrigeration coils and reverses the direction of the permanent magnet motor when the measured current drawn or measured torque produced are at or above a first limit. The method omits the use of switches and sensors to signal when the defrost device is reversed to reduce failures and stoppages.

Abstract: An impingement oven (40) includes an upper housing structure (46) forming the exterior of the upper half of the impingement oven and a lower housing structure (48) to mate with the upper housing structure. An interior impingement housing (62) is positioned interior to the upper and lower housing structures (46) and (48). A conveyor (60) extends through the interior impingement housing (62). The inside surfaces of the upper and lower housing structures (46) and (48) cooperate with the interior impingement housing (62) to define upright supply chambers (80a) and (80b) on opposite sides of the impingement oven to direct cooking medium downwardly upon the work products being carried by the conveyor and also upwardly through the porous belt of the conveyor, thereby to thermally process the work products being carried on the conveyor.