Please use these numbers when requesting service or parts information.
B - 1st Revision
Configuration Major Revision
M - Upflow / Horizontal A - Initial Release
C - Downflow / Horizontal B - 1st Revision
Motor NOx
V - Variable Speed ECM / ComfortNet N - Low NOx
E - Multi-Speed ECM
S - Single Speed Cabinet Width
A - 14"
Gas Valve B - 17.5"
M - Modulating C - 21"
C - 2 Stage D - 24.5"
S - Single Stage
Maximum CFM
AFUE 2 - 800 CFM
96 - 96% AFUE 3 - 1200 CFM
92 - 92% AFUE 4 - 1600 CFM
5 - 2000 CFM
MBTU/h
040 - 40,000 BTU/h
060 - 60,000 BTU/h
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