The NEWS - February 18, 2008 - (Page 59)

bacteria growths on the air conditioner coil. They have little to no effect on airborne bacteria, viruses, odors, or VOCs unless very large commercial, heavyduty UV systems are utilized. The key to good UV/air conditioner coil mold control is the installation. A small air conditioner coil will require a minimum of three UV lights. The geometry of the light and the intensity will dictate the effectiveness. Remember, only the surface the light is shining on will be treated, and only up to 6 inches to 8 inches in distance from the bulb. Example No. 3: A small air conditioner coil with one UV bulb mounted in the center. Only one-half of this coil has UV protection as the outer sections have no UV bulbs. Figure 3 shows how the light does not go through the coil as the geometry of the fins will not permit it. Example No. 4: A large residential coil could require nine UV bulbs to provide good UV protection for mold/bacteria growth. This will add approximately 300 watts of heat energy to the air conditioner system. However, the mold/ bacteria protection and subsequent airflow savings would make this installation worthwhile. Example No. 5: A large residential a/c coil will require six lamps for a good coverage. This is an example of an excellent installation. Example No. 6: A clean 9-yearold coil from a Florida home that survived three hurricanes within a total of 30 days of power outage. An advanced oxidation cell was properly and professionally installed. GERMICIDAL LAMPS ON AIRBORNE MICROBES UV has the ability to kill surface bacteria that the bulb is EXAMPLES The following are examples of installation. Example No. 1: An eight-year old air conditioner coil with two bulbs properly installed on the inside, one bulb was dead. There is growth next to the dead bulb. The other side is clean. No bulbs were installed on the outside. Accordingly, only one-half of this air conditioner coil was treated. The outside of the air conditioner coil was full of mold and bacteria, blocking airflow and creating IAQ problems. This installation is of minimal value to the customer. Example No. 2: A 10-year-old air conditioner coil with a UV bulb placed too close to the end coil. Most of the coil was clean, but the 25 percent over 8 inches away grew mold and bacteria, actually blocking airflow of 25 percent. This installation was of some value to the client, but not 100 percent. “Early Warning” Environmental System IR-SNIF-MCD Multiple Channel Refrigerant Loss Monitors One Monitor For Multiple Refrigerants Designed for Industrial Comfort Air and Refrigeration applications with audible, visual and BAS alarm configurations; SenTech’s IR-SNIF 1,2,3 (Single Zone) and MCD (Multi-Zone) models are cost effective, self-contained active air-draw sampling systems offering highly reliable Infrared based performance capable of monitoring and responding to 22 refrigerants at concentrations as low as 10 and 1 PPM. Meets ASHRAE 15. SenTech Corporation Check our Web Site: www.SenTechCorp.com Call or Write for additional information. Phone: (317) 248-1988 • (888) 248-1988 Fax (317) 248-2014 Here is a cross section of a clean AC coil. Note that the aluminum fins transfer cold. Meanwhile, the copper tubes carry chilled gas. ETL Lis ted. eProduct #29 at achrnews.com good filter, with the UV lamp placed over the indoor coil,’ Pharo said. ‘Air conditioning systems are great inventions, but the moist environment (at the coils) creates a microbial breeding ground.’ “Additionally, when UV lamps are shining directly on the coils, they are hitting a stationary target. When moving targets (VOCs and microbes) pass UV lights, the more sensitive microbes may be damaged, but the hardier ones will pass unharmed.” UV lights, for instance, have been found to be better applied to shine on the indoor coil, not to try to clean the air stream, particularly in residential and light commercial applications; air stream use requires intense UV saturation. UVC lights on an air conditioner coil are like the sun shining on a rock by a stream. No mold or mildew will grow on the sunny rock, unlike a shaded rock. The main advantages to UVC lights are low cost, easy installation, and effectiveness on suppressing mold/bacteria growth on the coil that has the light shining on it. UVC lights installed correctly can effectively control mold and ONLINE AT WWW.ACHRNEWS.COM ■ Emergency Rentals Chillers Cooling Towers Air Conditioners Spot Coolers Air Handlers Dehumidifiers Heaters Boilers Generators The one place where you really can have it all. rent Simple to industrial grade. Any project. Any size. Anywhere. Institutional Industrial Manufacturing Construction Disaster Recovery 800-586-8336 CarrierRental012108.indd 1 CarrierRentals.com Commercial Formerly HVAC Portable Systems, Inc. & NuTemp, Inc. eProduct #35 at achrnews.com 1/8/08 9:12:59 AM February 18, 2008 59 http://www.SenTechCorp.com http://www.SenTechCorp.com http://WWW.ACHRNEWS.COM http://CarrierRentals.com http://CarrierRentals.com http://WWW.ACHRNEWS.COM http://WWW.ACHRNEWS.COM

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The NEWS - February 18, 2008 Turnout Contents Newsline FYI Unitary Oil-Fired Products Furnaces Hydronics Ductless Rooftops Drives & Motors Controls Transmitters, Sensors Zoning Valves Refrigerants Condensers & Coils Heat Exchangers Cooling Towers Chillers Duct Products Humidification IAQ Monitors, Instruments Trucks Tools Software Installation, Maintenance of HVAC Coils Munters MCS Dries Up Water Concerns at Hospital Michigan Home Show Brings out Contractors Investigating Furnace Failures Mold/Bacteria Protection of A/C Coil Learning Center Classifieds Advertisers Opinions

The NEWS - February 18, 2008

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