HVAC systems are dark and damp places that are perfect breeding grounds for mould and bacteria. When the system is in operation these contaminants are circulated over the whole building. Building occupants exposed to these contaminants are prone to develop health problems like headaches, sinus, asthma, colds and flu. UVC Germicidal systems installed in the HVAC unit ensure that DNA based airborne contaminants are eliminated or reduced.
UV energy is found in the electromagnetic spectrum between visible light and X-rays. UV energy can be separated into UVA, UVB and UVC. Ultraviolet Germicidal Irradiation uses UVC and is delivered at 254 nanometers in the light spectrum. Its photons have just the right wavelength to physically destroy the DNA of microorganisms. UV light penetrates the outer cell membrane of the microorganism, passes through the cell body, reaches the DNA and alters its genetic material. Without using chemicals, the microorganism is destroyed and unable to reproduce. UVC is effective against Mycobacterium tuberculosis (TB), Legionella pneumophila (Legionnaire’s Disease), Influenza A virus and many other airborne infectious microbes.
UVC Lamps are arranged and installed in front or behind the cooling coil of each AHU (Air Handling Unit). The Lamps are arrayed such as to give maximum irradiance to the cooling coil surface. They are mounted on aluminium frames and are powered remotely from a control box housing the ballasts and sensor boards. This control box is mounted outside the AHU, out of the air stream. This is a customised solution and each AHU requires one control box and an appropriate number of lamps, depending on the size of the AHU.
UV Resources’ Ballasts and UVC Lamps are configured into Duct Mounted Units (DUV Type) and are designed to be used in confined areas like Fan Coil Units (FCU) or in Air Conditioning Ducts. DUV units provide 360° irradiation. They use high output lamps assembled with a ballast housing assembly that can be easily installed by opening a 50mm hole on the side of the FCU or duct. The housing is attached by means of self-taping screws on the exterior of the duct/FCU. The UVC lamp can be easily removed by opening the housing cover and releasing 4 retaining screws. The ballast is not disturbed during lamp change. DUV units come with an on/off switch with an LED light. Building Management System (BMS) Card for each unit is available as an option.