Steam Distributing coil applications are primarily for below freezing air applications. The inner distributing tubes supply hot steam down the entire length of tubes, thus warming the condensate that has been formed inside the tubes.
Standard Steam coil applications are for above freezing applications. This coil requires standard oversized holes in tube sheets for expansion and contraction requirements.
Most HVAC preheat coils use 100% outside air with low pressure steam. In very large HVAC systems, longer coils (over 60" long) are required to meet the performance. These longer lengths could cause the 5/8" steam distributing coils to clog with condensate. This clogging reduces capacity because steam and condensate may take up the same space at the same time. It also may cause condensate freeze up. Therefore, 1" steam distributing coils are recommended for these applications.
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