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4.9 Connect the Power Supply
WARNING
• DO NOT use an extension cord or adapter plug with this appliance.
• The water heater must be electrically grounded in accordance with local codes and ordinances or,
in the absence of local codes, in accordance with the National Electrical Code, ANSI/NFPA No.70.
• Indoor water heaters are equipped with a three-prong (grounding) plug for your protection against
shock hazard and should be plugged directly into a properly grounded three-prong receptacle. DO
NOT cut or remove the grounding terminal from this plug.
4.9. 1 Guidelines
When connecting the power supply, follow these guidelines:
• DO NOT rely on the gas or water piping to ground the water heater. Ground locations are provid-
ed inside the water heater.
• The water heater requires 120 V AC, 60 Hz power from a properly grounded circuit.
• If using the 5 ft (1.5 m) power cord (supplied with internal/indoor water heaters), plug it into a
standard 3 prong 120 V AC, 60 Hz properly grounded wall outlet.
• On external (outdoor) models, a proper disconnect (i.e. on/off switch, power cord, etc.) must be
provided and installed for the incoming 120 V AC power. The switch should be a type that is suit-
able for outdoor use. Check the National Electrical Code, ANSI/NFPA 70 and your local codes for
a proper switch type to use in your area. Power connections must be protected from the weather
and flexible cords must use an appropriate strain relief.
• The wiring diagram is located on the inside of the water heater front cover.
Figure 30
Checklist for Gas and Power Supply
□
A manual gas shutoff (control) valve is located in the gas line to the water heater.
□
Check the gas lines and connections for leaks.
□
Confirm that the gas inlet pressure is within limits.
□
Confirm that the water heater is rated for the gas type supplied.
□
Confirm that the electricity is supplied from 120 V AC, 60 Hz power source and is in a properly
grounded circuit.
□
Confirm an extension cord or an adapter plug has not been used with the water heater.
Rinnai Tankless Water Heater Installation and Operation Manual
Ground connection
screw
Disconnect on/off switch, power cord, etc. (required on
external outdoor models)
120V Wiring
• White wire (Neutral)
• Black wire (Hot leg)
37
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