Heat Exchanger, Fr SVCE (590, 680, 690, 695-2)
  590     Use Starting With Serial #1197840.
          See 4251090 For Additional Serial Breaks
  680     Use Prior to Serial #1810000.
          From #1810000 to #2271174 See 7016221
  690     Use Prior to Serial #1810000.
          Starting With #1810000 See 7019342.
  695     Use Regardless of Serial Number.