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5.4 Setting the Temperature .......................................................................................................74 <br /> 5.5 Performance Data.................................................................................................................75 <br /> 5.6 Diagnostic Codes..................................................................................................................77 <br /> 6. Maintenance..................................................................................................................................80 <br /> 6.1 Maintenance.........................................................................................................................80 <br /> 6.2 Cleaning and Inspecting the Air Filter (Indoor Units Only)....................................................82 <br /> 6.3 Flushing the Heat Exchanger...............................................................................................84 <br /> 6.4 Draining the Water Heater....................................................................................................85 <br /> 7. Appendices ...................................................................................................................................86 <br /> 7.1 Massachusetts State Gas Regulations.................................................................................86 <br /> 7.2 Wiring Diagram.....................................................................................................................88 <br /> 7.3 Ladder Diagram....................................................................................................................89 <br /> 7.4 Pressure Drop and Water Flow Curves................................................................................90 <br /> 7.5 Guidelines for Additional Temperature Controllers ...............................................................91 <br /> 8. Warranty ........................................................................................................................................92 <br /> Rinnai Tankless Water Heater Installation and Operation Manual 4 <br />