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2.1 Safety Symbols 2.2 Safety Precautions <br /> The following precautions apply to the installer and <br /> WARNING Indicates an imminently consumer. Read and follow all instructions in this <br /> hazardous situation section. <br /> which, if not avoided, will <br /> result in personal injury or <br /> death. A WA R N I N G DO NOT adjust the <br /> internal gas valve. <br /> The design is such that <br /> CAUTION Indicates a potentially adjustment is not required. Warranty may be <br /> hazardous situation voided if the internal gas valve is adjusted. <br /> which, if not avoided, <br /> could result in minor or <br /> moderate injury. It may • Before operating, smell all around the ap- <br /> also be used to alert pliance area for gas. Be sure to smell next <br /> against unsafe practices. to the floor because some gas is heavier <br /> than air and will settle on the floor. <br /> A Safety alert symbol.Alerts you to • Keep the area around the appliance clear <br /> potential hazards that can kill or hurt and free from combustible materials, <br /> gasoline, and other flammable vapors and <br /> you and others. liquids. <br /> • Combustible construction refers to adja- <br /> cent walls and ceiling and should not be <br /> confused with combustible or flammable <br /> DANGER Indicates an imminently products and materials. Combustible and/ <br /> hazardous situation which, or flammable products and materials <br /> if not avoided, will result in should never be stored in the vicinity of <br /> personal injury or death. this or any gas appliance. <br /> • Always check the water temperature be- <br /> fore entering a shower or bath. <br /> • To protect yourself from harm, before per- <br /> forming maintenance: <br /> — Turn off the electrical power supply by <br /> unplugging the power cord or by turning <br /> off the electricity at the circuit breaker. <br /> (The temperature controller does not <br /> control the electrical power.) <br /> — Turn off the gas at the manual gas con- <br /> trol valve, usually located immediately <br /> below the water heater. <br /> — Turn off the incoming water supply. <br /> This can be done at the isolation valve <br /> immediately below the water heater or <br /> by turning off the water supply to the <br /> building. <br /> Rinnai Tankless Water Heater Installation and Operation Manual 7 <br />