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Sectional No Background - Thumbnail

Many heating and cooling coils are installed in air handling units with very limited access to the unit. This often occurs because the original designer didn’t give much thought to possible future replacement of the coils and fans.  We have all seen ductwork, electric lines, water lines, boilers, chillers, pumps and other air handlers where it’s impossible to install a new coil. The pull length...

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Corroded-tube-bundle - blog

USA Coil & Air manufactures shell and tube heat exchangers and replacement tube bundles for existing equipment. Most of our applications are water to water type or steam to water type of heat exchange. Tube materials are normally copper, carbon steel, admiralty brass, 90/10 cupro-nickel, 304L or 316L stainless steel. Tube sheets can be made of the same materials. We can cross reference many of...

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corrosion in tube

Replacing heat exchanger coils has been taking place since the beginning of the HVAC and processing and cooling era.  It’s now close to 90 years since the first finned tube heat exchangers appeared on the market in the early 1900’s. The coil has undergone drastic changes over the years - from spiral wound type through the plate fin coils that currently dominate the market. Throughout...

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Booster-820x450

If you’re in the HVAC industry, then you’ve been involved in projects and installations that have duct mounted booster heating coils.  How did the term “booster” originate?  Most heating coil applications have a main heating coil that takes air from the lowest entering air temperature to an intermediate air temperature.  Each individual space has its own heat load, and the duct mounted booster coil is...

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Pinholes inside tubes-820x450

Situation:  Fourteen-year old steam coils with no previous leaks suddenly develop multiple leaks over the following two or three years – in some cases so many that they can no longer be repaired.  The owner thinks the coils have worn out and that new replacement coils will last approximately as long as the original coils.  To everyone’s surprise, the replacement coils begin to have the...

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Fluid Coil-820x450

Replacement coils are different than most parts of an air conditioning or heating system. By and large, replacement coils are not in stock and will need to be fabricated. You can select thermostats, valves, fan parts and even compressors in stock – but rarely an HVAC coil. This separates the men from the boys in our industry. Today, there are a lot of alternatives available...

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