All Bethlehem Dynatherm and Dynatherm™ boiler models are identified by a Serial Number (ex: 3421) usually with an alphabetical prefix (ex: FP3421). The following list defines the serial number notation for each model produced since 1937 for which parts are still available. The "Parts/Price List Notation" indicates the abbreviation for model designations as used on the Parts Price List.
Series 1945 1. Original two-pass Bethlehem Dynatherm (discontinued in 1947), serial number with no prefix. Example: 3421. Series 1945 2. First three-pass Bethlehem Dynatherm(belly type) 1947 to 1948, serial number prefixed with 0. Example:03421. Bethlehem Dynatherm 3 Series 10 (1948 to 1949), serial number prefixed with 10. RB 4. Revised belly type Bethlehem Dynatherm(1950 to 1964), serial number prefixed with RB. Example: R133421. FP 5.Bethlehem Dynatherm FP Model (1965 to 1974), serial number prefixed with FP. Example: FP3421. CC 6. Bethlehem Dynatherm CC Model (1974 to 1976), serial number prefixed with CC. Example: CC3421. FPA 7.Bethlehem Dynatherm FPA Model (1976 to 1977), serial number prefixed with FPA. Example: FPA3421. FPB 8.Bethlehem Dynatherm FPB Model (1977 to 1988), serial number prefixed with FPB. (First model using conventional retention head burner) Example: FPB3421. FPC 9. Bethlehem Dynatherm FPC (1988 to 1990), serial number without prefix. Example: 3421. FPC 10. Bethlehem Dynatherm FPC (1991 to 1996), serial number prefixed with C. Example: C3421. FPC 11. Dynatherm™ FPC manufactured by Dynatherm (1996 to Present), serial number prefixed with C. Example: C3421
All service MUST be performed by a Qualified Dynatherm™ Service Technician