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4.3 Choose an Table 5 Installation Contaminant Maximum Total Hardness Up to 200 mg/L Location Aluminum * Up to 0.2 mg/L * When selecting an installation location, you must Chlorides Up to 250 mg/L ensure that clearances will be met and that the Copper* Up to 1.0 mg/L vent length will be within required limits. Consider Dissolved Carbon Up to 15.0 mg/L the installation environment, water quality, and Dioxide (CO2) need for freeze protection. Requirements for Iron * Up to 0.3 mg/L the gas line, water lines, electrical connection, and condensate disposal can be found in their Manganese * Up to 0.05 mg/L respective installation sections in this manual. pH * 6.5 to 8.5 TDS (Total Dissolved Up to 500 mg/L 4.3.1 Water Quality solids)* Guidelines zinc* Up to 5 mg/L *Source: Part 143 National Secondary Drinking Water This section provides information on the Regulation importance of water quality to the Rinnai Tankless Water Heater. The information is intended to serve as general guidelines only and is not a complete 4.3.2 Environment list of water quality guidelines. Consideration of care for your water heater should Air surrounding the water heater, venting, and vent include evaluation of water quality. The water must termination(s) is used for combustion and must be potable, free of corrosive chemicals, sand, be free of any compounds that cause corrosion of dirt, or other contaminants. It is up to the installer internal components. to ensure the water does not contain corrosive chemicals or elements that can affect or damage the Rinnai Tankless Water Heater. Water that These include corrosive compounds that are contains chemicals exceeding the levels below found in aerosol sprays, detergents, bleaches, can damage the Rinnai Tankless Water Heater. cleaning solvents, oil-based paints/varnishes, and Replacement of components due to water quality refrigerants. The air in beauty shops, dry cleaning damage is not covered by the warranty. stores, photo processing labs, and storage areas for pool supplies often contains these compounds. If you install this water heater in an area that is Therefore, it is recommended that external known to have hard water or that causes scale (outdoor) models be used for these locations build-up, the water must be treated and may where possible. In applications utilizing room air require a more frequent flushing schedule. This where there are high levels of particulates, Rinnai water heater includes a service indicator(Service offers a room air screen. Soon, SS). When selected in the parameter settings, an 55 code will display on the controller The water heater, venting, and vent termination(s) indicating that it is time to flush and service should not be installed in any areas where the air the water heater. Scale build-up is caused by may contain these corrosive compounds. hard water and can be accelerated if the water heater is set at a high temperature. Rinnai offers Southeastern Filtration's"ScaleCutter Water Conditioning System"that offers superior lime scale prevention and corrosion control. Rinnai Tankless Water Heater Installation and Operation Manual 19