This listing will not answer all your questions as there are many variations and models not covered. It would take days to compile all the different brands and models. So if you are looking for something please call as we have all the books available to cross reference. Even for units long out of production by companies out of business. 

Units made prior to 1982

FD125A

FD = Downflow (UD=Upflow)

125 = BTU (10 ton) (Various sizes from 6 to 40 tons)

A = Aircooled (outdoor condenser) (G=Gycol, W=Water)

Units made prior to 1985

FH125AUA01

FH = Downflow (FE=Downflow w/econocoil, UH=Upflow, UE=Upflow w/econocoil)

125 = BTU (10 ton) (Various sizes from 6 to 40 tons)

A = Air cooled (outdoor condenser) (G=Gycol, W=Water, C=Chilled Water)

U = compressor Unloaders ( "-" means no unloaders)

A = 460 volt 3 Phase (B=575v, C=208v, D=230v) 

01 = Level of electronics (03=Level of electronics)

Units made prior to 1995

FH125AUA10

FH = Downflow (FE=Downflow w/econocoil, UH=Upflow, UE=Upflow w/econocoil)

125 = BTU (10 ton) (Various sizes from 6 to 40 tons)

A = Air cooled (outdoor condenser) (G=Gycol, W=Water, C=Chilled Water)

U = compressor Unloaders ( "-" means no unloaders)

A = 460 volt 3 Phase (B=575v, C=208v, D=230v) 

01 = Level of electronics (standard) (10=Level of electronics advanced) 

Units made from 1995 on

DH125AUASEI

DH = Downflow (DE=Downflow w/econocoil, VH=Upflow, VE=Upflow w/econocoil, UH=Upflow chilled water)

125 = BTU (10 ton) (Various sizes from 6 to 40 tons)

A = Air cooled (outdoor condenser) (G=Gycol, W=Water, C=Chilled Water)

U = compressor Unloaders ( "-" means no unloaders, V=VSD, Variable speed drive, H=CXW, Hot Gas Bypass)

A = 460 volt 3 Phase (B=575v, C=208v, D=230v) 

S = Level of electronics (standard) (A=Level of electronics advanced, G=Level of electronics advanced w/graphics) 

E = Electric Reheat (0=No reheat, S=SCR reheat, H=hot water reheat, G=Hot gas reheat, T=Steam reheat)

I = Infrared Humidifier (0=No humidifier, G=Steam Grid humidifier, S=Steam Generating Humidifier)

Model number chart for Liebert, Airflow, APC Network Air, Air Technology Systems, Stulz, Data-Aire, Pomona, Liskey, Contempo, Trane, and others

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