Central Station Units

Outside Air Loads

HVAC and process heating/cooling must deal with the added tonnage created by using fresh air from outside. Most times, the requirement for fresh air is mandatory and can go from 10% all the way to 100 % of the system air flow. There are numerous rules and regulations written to eliminate air flow quality problems, including bacteria and other micro-organisms, that can cause health problems....

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Replacement Coils

Coil replacement has been a part of the HVAC aftermarket for as long as finned tube coils have been used to create heat transfer. The coils installed in the 50’s and 60’s were heavier duty than today’s coils and were almost always spiral fin type with a tension wound fin onto copper tubes.  The plate fin didn’t become prevalent until the mid-60’s. By the end...

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Indoor Central Station Air Handlers

  For years, owners have looked at dilapidated, rusted out air handling units in their mechanical rooms and thought, “If I could only get rid of this old unit and replace it with a newer, more sophisticated design.” This is possible, provided you stop listening to the usual pitch by those who tell you to rehabilitate the old unit. After rehabilitation, you are still left with...

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