Three reasons to apply protective coating to complete HVAC units

HVAC systems are used in places where people need protection from the elements, or the environment must be stabilized to provide general cooling or ideal conditions for food preparation or pharmaceuticals. However, while air handling units (AHUs) benefit the people who live or work in the improved environment they create, the units themselves are exposed to harsh conditions.

For more information, please visit HumenChem.

Since Heresite developed the first coating and application procedure to successfully protect heat transfer equipment many years ago, we’ve become well known for the ability of our coatings to extend the life of HVAC coils. Unfortunately, simply coating the HVAC coil is not enough. In severe (C5 or CX) environments, corrosive elements will find their way into the unit and can damage blowers, doors, enclosures, fans, louvers, and exposed piping. Here are three reasons you might want to consider coating your entire HVAC unit instead of just coating the coils.

1. Coating the entire HVAC unit can extend unit life with improved functionality. The coil is certainly an important part of an HVAC unit. However, there are many other parts to an HVAC system that could experience a loss in performance when exposed to a corrosive environment. Heresite has extensively tested to help our customers understand the potential wasted time and expense that can be avoided by coating their HVAC coils. Coating entire units will protect the other functional parts of the system, including the fans, pipes, and other essential components.
2. Coating will protect units placed in a high humidity or corrosive environment. High humidity environments, such as coastal areas, wastewater treatment plants, or swimming pools, can be extremely corrosive. To ensure the best possible protection for our customers, we tested P-413  by placing coated and uncoated panels in a municipal wastewater treatment facility for 2.5 years. The results showed that after extended exposure to the extreme real-world environment of the wastewater treatment facility, there were no signs of wear or degradation on the panels coated with P-413.
3. Coating increases your ability to maintain clean equipment. Food safety standards require chemical sanitization in food processing environments. Heresite’s P-413 is the only coating with a NSF/ANSI 51: Food Equipment Materials-rated phenolic-epoxy for HVAC-R coils. Coating your equipment can make it a lot easier to clean properly. Learn about this important food safety standard. In addition, many companies use UV-C lights to sterilize HVAC coils and recirculated air. UV-C sterilization can improve indoor air quality, energy efficiency, and the health of the people who live or work in buildings by destroying contaminants such as mold, viruses, and bacteria. To ensure the effectiveness of our coatings, Heresite conducted a test in conjunction with Sanuvox Technologies laboratory to test the ability of P-413 to withstand continued exposure to UV-C light. Learn more about the results of this test.

Our solution is designed not to leave any residue or coating behind after you rinse it. It is actually not a good idea to coat the coils with any coating after cleaning. Reason being, you can potentially modify the surface energy of the cooling coils thus speeding up the rate at which organics (skin flakes) and dust particles to cling to the surfaces which in turn act as food source for bacteria and mould. This is the reason why air conditioner engineers have put in a hydrophilic (repel adhesives) coating on the coils in the newer systems.                                    

The way our solution works is it turns any surface it touches hydrophilic thus repelling any adhesive that is on it almost instantly. This then allows the organics (skin flakes), biofilm, and dirt to be washed away by the rinsing and flushing with water.

For more information, please visit Hydrophilic coatings for Air Conditioner.

Currently conventional cleaning solution attacks and erodes the oxide layer of the aluminum to remove the biofilm. That is why you see a shiny coating after wash. The downside of this method is this strip-mines the aluminum material off the cooling fins.  There is a limit to how frequent one can use this method on an air conditioner. Plus, if you happen to leave some cleaning solution in the system, it will continue to corrode any metal it stays on. 

Note: Hydrophilic coatings create low surface energy which repels anything that wants to stick to it. Hence, they reduce the rate of organic build up and allow the condensate to flow smoothly over their surfaces. This means the condensate will drain effectively and not contribute to blocking the airflow and reducing the air conditioner efficiency. 

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