An apparatus for chilling or freezing products which may be operated in the IQF and non-IQF modes, having conveyor for transporting products through a refrigeration medium, said conveyor having a top surface and a bottom surface, conveyor motor to move said conveyor； at least one agitation assembly comprising at least one cam attached to at least one camshaft, said at least one camshaft rotatably mounted below said bottom surface of said conveyor, such that the cam makes initial contact with the conveyor when its vertical component of velocity is at or near its maximum during each 360° rotation of the camshaft, and an independently controlled agitation motor operatively associated with the at least one agitation assembly to operate the agitation assembly to cause the agitation of the conveyor and the products thereon when said apparatus is operated in the IQF mode. An apparatus for chilling or freezing products comprising a conveyor and at least one mobile side guide contacting the conveyor.
