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6.3 Flushing t h e Heat G. Allow water to flow through the water heat- <br /> er for five minutes. <br /> H. Close shutoff valve (V4). When unit has <br /> Exchanger finished draining remove the in-line filter <br /> at the cold water inlet and clean out any <br /> This water heater includes a service indicated/ residue. Place filter back into unit and open <br /> reminder(Service Soon, SS). When selected in valve (V4). <br /> the parameter settings, an SS code will display I. Close service valve (V1) and open shutoff <br /> on the controller indicating that it is time to flush valve (V3). <br /> and service the water heater. Failure to flush <br /> the appliance will cause damage to the heat 12. Disconnect all hose <br /> exchanger. Damage caused by lime build-up is <br /> not covered by the water heater's warranty. Rinnai 13. Restore electrical power to the water heater. <br /> strongly recommends installation of isolation <br /> valves to allow for flushing of the heat exchanger. NOTE <br /> Scale build-up will affect the performance of the <br /> 1. Turn off power at the controller. water heater. Water should be treated. Rinnai <br /> offers Southeastern Filtration's "ScaleCutter <br /> 2. Disconnect electrical power to the water Water Conditioning System"that offers superior <br /> heater. lime scale prevention and corrosion control by <br /> 3. Close the shutoff valves on both the hot water feeding a blend of control compounds into the <br /> and cold water lines (V3 and V4). cold water supply. <br /> 4. Connect pump outlet hose (H1)to the cold <br /> water line at service valve (V2). <br /> 5. Connect drain hose (H3)to the hot water line <br /> at service valve (V1). <br /> 6. Pour four gallons of undiluted virgin, food <br /> grade, white vinegar into pail. <br /> 7. Place the drain hose (H3) and the hose (H2) <br /> to the pump inlet into the cleaning solution. <br /> 8. Open both service valves (V1 and V2)on the <br /> hot water and cold water lines. <br /> L <br /> 9. Operate the pump and allow the vinegar to Vl 1- Va;i <br /> circulate through the water heater for at least 1 <br /> hour at a rate of four gallons per minute (15.1 Vs V4 <br /> liters per minute). <br /> Hot wsl r Cold ar Na <br /> Sepply Goe Supply Gee <br /> 10. Turnoff the pump. H' HZ Hl <br /> 11. Rinse the vinegar from the water heater as Circulating Pump <br /> follows: i 4 r� I& 314"Ball Valve <br /> 314"Union <br /> E. Remove the free end of the drain hose (H3) Pressure Reft(Valve <br /> from the pail. Place in sink or outside to Circulating Pump <br /> drain. F23 Boller Drain Valve <br /> F.Close service valve (V2)and open shutoff <br /> valve (V4). Do not open shutoff valve (V3). Figure 82 <br /> Rinnai Tankless Water Heater Installation and Operation Manual 84 <br />