Replacement Expander Board for VS520SZ and Older CL501X1 Systems
Used in VS520SZ control systems for 2 speed pump models (SKU: 56007-01), and older CL501X1 control systems with 1 speed pumps and 2 speed pumps (SKU: 56563-01 & SKU: 56563-02). Supports one additional pump with a 30A fuse.