Heckert FW315, FU315, FW400, FW400V, FW400V1 & FSS400 x 1600 Manual Heckert (WMW) FW315, FU315, FW400, FW400V and FSS400 x 1600 Millers. Installation and Operator's Instruction Manual with Sectional Drawings. This edition is for the older models with logic controllers. Manufacturers: Heckert WMW Models: FW315 FU315 FW400 FW400V FW400V1 FSS400 Contents: Operators Manual Technical Drawings