USA Coil & Air has been marketing our patented, freeze-damage water and steam coil line for over 25 years under the name Sentry Guard™. Sentry Guard™ is a one-of-a-kind invention that guarantees that any water or steam coil will not have freeze damage during a freeze event. What is a "freeze event"? Freeze events occur when chilled water, hot water, or steam heating coil has liquid in...
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The “holiday season” may be over, but the “coil replacement season” is in full swing in many areas of the country. Particular attention must be paid to the condition of your heating and cooling coils. Heating coils that aren’t providing the needed BTUH capacity can become a huge problem in the dead of winter, while cooling coils and condenser coils must be ordered and replaced...
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The HVAC industry has many manufacturers of units that all have heating and/or cooling coils as an integral part of their package. There are also many free-standing coils in large built up systems and some are mounted in duct runs from a central station unit. What they all have in common is the presumption that all the coils will meet the designated performance. They do...
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Almost all packaged A/C or split system units do not have a service factor for extra capacity. Even when new, these units may not yield the cooling BTUH capacity specified due to improper installation and/or incorrect load calculations at the inception of installation and startup. Consequently, as the system gets older and parts become less efficient, the system may lower its capacity to the point...
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Air handling units that include single and double wall air handlers have had energy saving devices available for many decades. First, there was the variable inlet vane which reduced air flow and power consumption during off peak conditions. The latest way is to place a Variable Frequency Drive (VFD) in the unit, which is more efficient than its predecessor, the variable inlet vane. VFD installations...
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There are many existing systems that require the addition of cooling to a heating-only unit. Systems need to keep pace with changing requirements for spaces that include a mandatory requirement for cooling. Existing systems can already have cooling, but a booster will have to be placed into the system to add additional cooling. When cooling is added, it must be decided whether the tonnage can be...
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In the HVAC industry, “Fan Coil Unit” is a term that relates to the most inexpensive way to heat or cool a space. If an “indoor air handler” is a “direct drive unit”, it should be considered a fan coil unit. Here are the pros and cons of heating and cooling with fan coil units. Pros: Often the most inexpensive way to heat or cool a...
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The generic terms “industrial “and “heavy duty” are used to describe an HVAC coil that has an arrangement and/or construction that creates quality heat transfer when adverse temperature, pressure, or a corrosive agent are present. Standard HVAC coils are constructed of copper tubes, aluminum or copper fins, and galvanized steel. The normal temperature for these materials is 250 degrees F and 200 PSIG pressure. Enter Carbon...
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Most HVAC steam heating coils operate with steam pressure below 25 PSIG, and a very large percentage are below 15 PSIG. These coils have specific piping and coil arrangement requirements to allow these systems to optimize performance and avoid systematic problems that require premature replacement. Preheat coils in most of the country will require an arrangement that deals with below freezing air temperatures. In conjunction with...
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Central station air handlers require constant attention to ensure the units perform efficiently and have a longevity of up to 2 to 3 decades. By their very nature and because of space conditions, these units almost never have enough space and access to make this job an easy one. Most units fabricated before 1985 are a single-wall type with insulation exposed to the air flow and...
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