Coils are some of the most critical and delicate components in an HVAC system. Condenser coils, evaporator coils, and electromagnetic coils work together to maintain optimal indoor temperature and environment. The best way to maintain and increase the lifespan of HVAC coils is by coating.
If you’re thinking about coil coating the HVAC system of your commercial or industrial property, this guide is for you. Here’s a closer look at what coil coating is, different coating materials, and coating methods:
What is HVAC Coil Coating?
HVAC coil protection is the process of adding a protective layer to the coils of an HVAC unit. The aim is to protect the coils from salt, moisture, chemicals, and other environmental factors and reduce wear and tear.
Corrosion, caused by chlorides (found in detergents, fabric softeners, and tile cleaners) and formic acids (found in adhesives and silicone caulking), can lead to premature coil degradation.
Coil coating will not only prevent corrosion but also increase the energy efficiency of your HVAC system. This will lead to lower electricity bills and reduced stress.
Coating Material Types
Now that you know what HVAC coil protection is, here are some coating materials you should know:
Epoxy: It offers excellent adhesion and corrosion resistance. Epoxy coatings are incredibly affordable, perfect for those who’re looking to save money. The only drawback? The coating can be thicker, potentially impacting heat transfer.
Polyurethane: It is flexible, thin, and suitable for numerous types of coils. Like epoxy, polyurethane is also inexpensive. Polyurethane coating is commonly used for marine and offshore HVAC systems.
Fluoropolymer: It ensures chemical resistance, but can be a little heavy on the pocket.
Blygold: This is an aluminum pigmented polyurethane coating. Blygold coating offers excellent chemical and UV resistance and leaves a negligible impact on heat transfer or pressure drops. It is useful for coolers and condensers. The only drawback? It’s expensive.
E-coatings: Electrodeposition coatings are applied in a controlled environment. They provide higher corrosion resistance than epoxy and polyurethane.
HVAC Coil Protection Methods
Protective coil coating can be achieved through three common ways:
Spray Coating
This is the most inexpensive and commonly used coil protection method. Before application, the coils are thoroughly cleaned to remove any oil and grime. Then, a spray gun is used to evenly distribute the coating material on the coils. Spray coating can be done at a factory or on-site, depending on your project needs.
Dip Coating
Dip coating involves submerging HVAC coils (mostly condenser and evaporator coils) in a mixture of coating materials. It is suitable for certain industries and equipment. Hydrophilic coating and antimicrobial coatings are generally used.
Electroplating
Electroplating or E-coating is the process of applying coating materials to HVAC coils using electrical current. The result? Excellent adhesion and corrosion resistance. E-coating is known for creating a uniform coverage and precise thickness. Just make sure the contractor uses EPA-compliant methods and products.
Irrespective of the coating type and methods, always work with a reputable contractor to ensure long-lasting results.