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Indoor Central Station Air Handlers

Large indoor and outdoor central station air handlers eventually wear out and require either a complete refurbishment or replacement. They are usually located in ceilings, tight utility rooms, or mechanical rooms without access. Even the units that are on the roof or in a penthouse can require difficult, costly procedures to make replacement possible.                          ...

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Plugged Coil

  Replacing heat exchanger coils was adapted ever since the beginning of the HVAC and processing/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 the spiral wound type to the plate fin coils that currently dominate the market. Throughout each decade, the...

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Hot Water Coils

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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Hot Water Coil

Most heating coils are either a preheat or reheat coil mounted in a unit. Also, reheat coils can be mounted downstream of a unit in a supply duct. This article will address hot water and steam heating coils. There are numerous reasons why a heating coil may not perform to its expected capacity. The following are the major ones.   Improper Coil Selection   Heating coils can be selected...

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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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