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Basic Horizontal Unit

Many fan coil unit installations are in condos, apartments, townhouses, hotels, and other types of lodging. Most systems are two or four pipe heating/cooling systems and usually use chilled water for cooling and hot water for heating. These units can be permanent or temporary residences occupied by an owner, tenant, or paying customer, which may mean they are more demanding.   There are 3 types of units...

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Coil Delivery

Replacement coils are different than most parts of an air conditioning or heating system. 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. Today, there are a lot of alternatives available to replace coils, but how many have a successful history and a precise system to...

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Santa

  Around Christmas and New Year’s is always the busiest time of the year for all of us. It’s truly the best time of year to share with those we care about; enjoying shopping, family time, and holiday parties. The down side is that vacations and time off over these holidays leaves most companies with skeleton crews to monitor building HVAC systems. USA Coil wants to...

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Evaporator Coil

  Evaporator coils are a mystery to many technicians and engineers in the HVAC industry. Evaporator coils don’t have any movable parts, and a coil can have many different capacities based on what it’s fed from the refrigerant side of the closed refrigeration loop.   If a self-contained unit is used to provide air conditioning in a space, the evaporator coil will have been engineered to match the...

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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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pressure burst

There are numerous reasons why water and steam coils can have major freeze events.   The damage is often extensive enough to require a coil replacement. The following reviews some of the major freeze event causes.   Coils not drained properly when winterized – This problem may be out of your control. Many chilled water coil circuits and placement of drains makes it impossible to fully drain...

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Condenser Coil

Although there are a myriad of reasons why A/C and refrigeration systems have problems, many of them can be traced back to the “condenser coil”. An inefficient coil can cause reduced space temperatures and adverse system pressures that often lead to major component problems, including compressor failures.   The title of this article comes from one of our oldest and best representatives, Marty Sternberg. Marty personally evaluates...

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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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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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