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Natural Gas or LP Water Heaters
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| Defender Safety SystemTM Energy Saver (30, 40 50 and 60 Gallon Models) Include: |
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 Advanced ScreenLok Technology Flame Arrestor design -
Resettable thermal switch
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Maintenance free
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Pedestal base
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Sight window
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Factory installed Hydrojet Total Performance System
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Vitraglas lining
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3/4" NPT factory installed dielectric waterway fittings
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Protective magnesium anode rod
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"3" x "4" snap-Lock draft diverter on 40,000 BTU/Hr. or less models
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T&P relief valve included
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Brass drain valve
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1" Non-CFC foam insulation |
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How the Defender Safety System Works
During normal operation, air for combustion is drawn into the water heater through the opening in the jacket. This air travels down and around the combustion chamber and enters through holes in the very bottom of the corrosion-resistant combustion chamber. The air then travels up through the oriented flame arrestor plate louvers, where the velocity of the air is increased and its direction altered. The air then mixes in a normal manner with the supplied gas and is efficiently combusted, producing very low NOx emissions.
In the case where trace amounts of flammable vapors are present in the air flowing into the combustion chamber, the burner or pilot flame harmlessly ignites the vapors. If flammable vapors are in sufficient quantity to prevent normal combustion the burner and pilot flame is shut down. Should the flammable vapors continue to the burner, the flame arrestor plate prevents the flames from traveling backwards and igniting vapors outside of the combustion chamber. The calibrated, multipurpose thermal switch recognizes this and shuts down the pilot and main burner. This switch also deactivates the burner and pilot in the unlikely event of restricted airflow caused by severe lint, dust or oil accumulation on the arrestor plate.
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For years, water heater designs proved themselves safe and reliable when installed, used and maintained properly. Unfortunately, occasional accidents were caused by the improper use and storage of flammable-vapor producing liquids near gas-fired appliances, such as water heaters and other common household appliances. To address this issue, a group of water heater manufacturers came together, in cooperation with the Consumer Products Safety Commission, to form the Joint Research and Development Consortium. The goal of this alliance was to develop technologies for gas-fired water heaters that would resist igniting flammable vapors that result from the mishandling of gasoline and other flammable products.
This ongoing, voluntary industry-approach to developing FVIR technologies calls for manufacturers to invest their own resources in new product designs and the methods to test them. The resulting efforts capitalize on the industry's extensive product and applications expertise.
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What is FVIR?
Flammable Vapor Ignition Resistance is a technology developed for gas-fired water heaters that resists ignition of flammable vapors that may occur outside and in close proximity to a water heater as a result of the mishandling of flammable products.
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