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4.8.2 Instructions <br /> To install the pressure relief valve, follow the steps below. <br /> 1. On the bottom of the tankless water heater, hand tighten the Pressure Relief Valve Assembly and <br /> Gasket to the Pressure Relief Valve Union Fitting. <br /> 2. Rotate the Pressure Relief Valve Assembly to the desired accessible position. With a wrench, <br /> tighten the Union Nut to the Pressure Relief Valve Union Fitting. <br /> Pressure Relief Valve <br /> Union Fitting <br /> Gasket <br /> 1 <br /> Union Nut <br /> Pressure Relief Valve Assembly <br /> The Pressure Relief Valve <br /> Assembly can rotate 360' <br /> to accommodate the <br /> application. <br /> o ORA1W O <br /> Co <br /> Aj <br /> Gills <br /> Figure 58 <br /> IMPORTANT <br /> FDo use pipe dope or thread sealant on union fitting with gasket. <br /> ful not to lose or throw away the gasket. <br /> Rinnai Tankless Water Heater Installation and Operation Manual 57 <br />