One digit or number buried within the nomenclature can be trickier to spot than a sequence of numbers or letters. Two numbers in gas-fired equipment typically identifies its AFUE rating. When testing, remember this is only a laboratory rating and rarely equals actual installed equipment performance. Once installed into a building, the effects of the distribution system bears on the equipment. Several methods are used to identify equipment configuration. Equipment is made to be installed in an upflow, downflow, or horizontal position. Manufacturers also refer to multi-position equipment that may require field modifications. Most often the input (not output) of a gas furnace is imbedded in the model number by rounding off the Btuh. input to the nearest 5,000 and then dropping the last three zeroes. The example above includes 070 to represent a 68,000 Btuh. Good ‘ol California leads the nation in regulations including Nitrogen Oxide requirements. Seismic standards are also stated in some equipment nomenclature. These are identified by numbers or letters depending on each manufacture’s nomenclature patterns. Since the example above is a gas furnace, the cooling capacity matching the outdoor unit is referred to in the model number. This is where the classic numbers representing 12, 000 Btu/ton come into play such as 24 (representing 24,000 Btu or a nominal 2 ton cooling capacity) 30 (2.5 ton), 36 (3 ton), 42 (3.5 ton), 48 (4 ton) and 60 (5 ton).
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