Obsolete Units These units have been phased out and no longer being produced however, we have provided the pertinent documentation in case you require the technical or installation details. Air to Water AN (1.6-20 Tons)NRL 800-1800 (54-131 Tons)NRL 2000-3600 (145-261 Tons)NRL FC 800-1800 (50-118 Tons)NRL FC 2000-3600 (126-236 Tons) Fancoils FCX USP USPO (Ducted)FCX US (Cabinet)FCX I USP (Ducted ECM)FCX I US (Cabinet ECM)