carrier Steam Distributing coil

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The construction of a Steam Distributing Coil is entirely different than that of a Standard Steam. Everyplace that you see an outside tube or header, there is an inside tube and header that you can't see. All steam is distributed through these inside tubes and headers and slowly released to the outside tubes as the steam turns to condensate. The condensate then flows back down the outside tubes in the same direction that the

entering steam comes from. The idea is that all the steam in the inside tubes keeps the condensate in the outside tubes from freezing when air passes across the coil at less than 32ºF.

The idea behind the Steam Distributing coil was to keep an even flow of steam across the whole length of the coil, so that there were no uneven heating spots. On long coils it's very difficult to get steam to the far end of the coil, hence the name "Steam Distributing". Soon, however, manufacturers determined that these coils don't freeze easily and they became known as "non-freeze". This really is a slight misnomer, because under the exactly correct conditions, even non-freeze coils can freeze. If you don't believe this, call up your contractor friends in Minnesota or Maine and ask them. They'll tell you that it's possible to freeze any coil. In most commercial applications, however, Steam Distributing coils are used successfully to handle all outside air preheat applications where the entering air is 40ºF or below.