Rheem RS47-21BP, RS80-42BP Electrical System Requirements, Electrical Schematic

Models: RS47-21BP RS80-42BP

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Electrical System Requirements

NOTICE:All wiring must conform to local codes or the latest edition of National Electrical Code ANSI/NFPA 70.

!WARNING: Any wiring outside of the house should be rated for the appropriate weather conditions.

If the system is being used as a pre-heater to an existing water heater, the electrical review and installation may not be required.

A 240 Volt electrical breaker with appropriate amp rating is required to activate the Backup Heating Element located near or as part of the main circuit breaker/fuse panel.

The manufacturer’s warranty does not cover any damage or defect caused by installation, attachment or use of any type of energy saving or other unapproved devices (other than those authorized by the manufacturer) into, onto or in conjunction with the water heater. The use of unauthorized energy saving devices may shorten the life of the water heater and may endanger life and property.

The manufacturer disclaims any responsibility for such loss or injury resulting from the use of such

unauthorized devices.

Check the availability of a 240-volt, and an appropriately sized electrical breaker. A separate branch circuit with copper conductors, overcurrent protective device and suitable disconnecting means must be provided by a qualified electrician. If the breaker is not available, mark a location for a separate breaker.

When replacing an existing electric water heater see the chart on page 14.

The voltage requirements and wattage load for the water heater are specified on the rating plate on the front of the water heater.

The branch circuit wiring should include either:

Metallic conduit or metallic sheathed cable approved for use as a grounding conductor and installed with fittings approved for the purpose.

Non-metallic sheathed cable, metallic conduit or metallic sheathed cable not approved for use as a ground conductor shall include a separate conductor for grounding. It should be attached to the ground terminals of the water heater and the electrical distribution box.

Electrical Schematic

Weatherproofed

Roof-Mounted 2-Pole,

20-Amp Rated Switch Disconnected

Hot Return to

House

Weatherproofed

Roof-Mounted 2-Pole,

20-Amp Rated Switch

Disconnected

Roof Line

Cold Supply to Water

Heater

Circuit Breaker

Old Water Heater

Electrical Junction Box

240 Volt, 20 AMP Supply Breaker Using No. Main Supply Panel 12 Wire(Copper) MinimumSee the table on

page 14 for additional information.

Auxiliary Thermostatically Controlled Electric Back-Up 220/240 Volt/2.4 kW

Tank-Mounted

Thermostat 220/240

Volt D.P.S.T.

240 Volt, With Ground Supply Using 12 Ga.Wire (Copper) Minimum Depending on Amp draw. - See the table on page 14 for additional information.

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Rheem RS47-21BP, RS80-42BP installation instructions Electrical System Requirements, Electrical Schematic