![]() ![]() ![]() ![]() Most furnaces will have at least 2 internal drains, typically one for the heat exchanger and one for the vent, usually at the inducer outlet or on the inducer housing. In order for the furnace to work properly, that condensation needs to be drained out or else it would accumulate inside the heat exchanger, inducer and venting, impeding proper gas/combustion product flow. This means that in perfect combustion, for every molecule of CO2 you produce, there are also 2 water molecules produced. Now as technicians you don’t need to know this part but if you’re a bit into chemistry, here’s the basic chemical equation: CH4 + 2 O2 + heat = CO2 + 2 H2O This water comes from two sources: moisture which was already present in the combustion air, and the combustion process itself, as the hydrogen atoms from the natural gas molecules (methane, CH4) combine with oxygen to form water. This not only completely changes the way the furnace has to be vented (I will talk about venting specifically in a later tip) but also, and it’s what we’ll focus on, a lot of condensate is generated. Because of this, they generate flue gases much colder than those of a mid-efficiency or natural draft unit. High efficiency (or 90%, or condensing) furnaces use a set of two heat exchangers in order to retrieve more heat from the combustion products than their mid-efficiency counterparts. Are you a homeowner or own a commercial property? Check out to find a Bryant dealer near you! ![]()
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