Heat Exchanger SVCE(501R,601R,601RG,601-2,601RG-2)
  501R    Use From M/P1204240 to M/P1204489.
          Use Starting with M/P1208740.
          See 7015837 for additional serial breaks
 601R/601RG     Use Regardless of Serial Number.
 601R-2/601RG-2 Use Regardless of Serial Number.
 601R-3/601RG-3 Use Regardless of Serial Number.