30Electrical WiringChapter 4. – InstallationDo not connect electrical power to the unit until all electrical wiring has been completed.This appliance must be electrically grounded in accordance with local codes, or in the absence of lo-cal codes, with the National Electrical Code, ANSI/NFPA 70. In Canada, the latest CSA C22.1 ElectricalCode.Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can causeimproper and dangerous operation.Verify proper operation after servicing.Field wiring to be performed at time of appliance installation.• The electrical supply required by the water heater is 120VAC at 60 Hz. The power consumption may be up to 172W.Use an appropriate circuit.• Do not disconnect the power supply when not in use. When the power is off, the freeze prevention in the waterheater will not activate, resulting in possible freezing damage.• The electrical supply must be connected by designated power circuit.• Do not let the power cord contact the gas piping.Tie the redundant power cord outside the water heater. Putting the redundant length of cord inside thewater heater may cause electrical interference and faulty operation.Ground• To prevent electrical shock, provide a ground with resistance less than 100Ω . An electrician should do this work.Do not connect the ground to the city water or gas piping. Do not tie the ground to a telephone line.Breaker Installation• Mount a device which shuts off the electrical path automatically (leakage breaker) when electrical leakage isdetected.4-7. Electrical Wiring Do not connect electrical power to the unit until all electrical wiring hasbeen completed.WARNINGElectrical Shock HazardDo not turn power on until electrical wiring is finished. Disconnect power before servicing.Failure to do so may result in death or serious injury from electrical shockElectrostatic discharge can affect electronic components. Take precautions to prevent electrostatic dischargesfrom personnel or hand tools during the water heater installation and servicing to protect product’s electroniccontrol.Do not disconnect the electric power, gas and inlet water supply when not in use. If any of these item arenot properly connected freezing damage may occur. In this case, please drain all of water in the unit includ-ing condensate trap and unplug the unit.CAUTIONCAUTION