water inlet and outlet, open the nearest hot water tap and follow filling instructions.

5.Follow instructions for replacing the element in “ELEMENT CLEANING/REPLACEMENT.”

Never use this water heater unless it is completely full of water. To prevent damage to the tank and heating element, the tank must be filled with water. Water must flow from the hot water faucet before turning “ON” power. The manufacturer will not warrant any elements damaged by failure to follow instructions.

15.Check element for water leaks. If leakage occurs, tighten element. If necessary drain tank before repeating Steps 7 and 8, remove element and reposition gasket. Then repeat Steps 10 through 15.

16.Replace the two spade connectors on element into their original positions.

17.Replace the mounting bracket with the center rise facing outward and the screw hole up, see Figure 10.

18.Replace the insulation and front panel, lining up the three tabs at the top with the slots in the casing.

19.Replace the retaining screw and the temperature knob.

20.Plug heater into electrical outlet.

FIGURE 10.

TO REMOVE AND REPLACE ANODE:

1.Follow steps 1-8 of the Element Cleaning/Replacement section.

2.Using a 7mm wrench, remove the nut securing the anode.

3.Unscrew and remove anode.

4.Screw in the new anode and secure with the retaining nut.

High Limit Switch Removal and replacement

1.Turn off and unplug the heater from the electrical outlet.

2.Remove the front panel, see the “REMOVING THE FRONT PANEL” section in this manual. Remove the insulation pad. Remove personnel barrier.

3.Remove the four wires connected to the switch, taking care to note the original placement of each wire.

4.Using a 7mm wrench, remove the nuts securing the high limit switch to the tank enough to rotate the switch 90° counterclockwise and slide it out from beneath the bracket. It is not necessary to remove the nuts completely.

5.Place the new switch beneath the bracket and rotate it 90° clockwise.

NOTE: The taller spade terminal will be on the right side.

figure 11.

6.Replace and tighten the nuts so the high limit switch is firmly in contact with the tank surface.

7.Replace the four wires, taking care that they are replaced into their original positions and tighten screws.

8.Replace personnel barrier; replace insulation block and the front panel.

Service

If a condition persists or you are uncertain about the operation of the water heater contact a service agency.

Use this guide to check a “Leaking” water heater. Many suspected “Leakers” are not leaking tanks. Often the source of the water can be found and corrected.

If you are not thoroughly familiar with your water heater and safety practices, contact a qualified installer to check the water heater.

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A.O. Smith AOSRE50400 warranty High Limit Switch Removal and replacement, Service, To Remove and Replace Anode
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AOSRE50400 specifications

A.O. Smith AOSRE50400 is a high-efficiency water heater that exemplifies advanced technology and engineering, making it a popular choice for residential and commercial applications. This model is part of A.O. Smith’s comprehensive line of water heating solutions and is designed to provide reliable performance while maximizing energy efficiency.

One of the standout features of the AOSRE50400 is its high energy factor (EF), which greatly contributes to reduced energy bills and a smaller environmental footprint. With an EF rating of approximately 0.95, this water heater utilizes innovative design techniques to ensure that more of the energy consumed is converted into usable hot water. It meets and often exceeds the stringent energy efficiency standards set by the Department of Energy.

The AOSRE50400 is equipped with advanced insulating materials, which minimize heat loss and improve overall efficiency. This is particularly beneficial in maintaining water temperature for extended periods, reducing the need for excessive reheating. The tank has been designed with a glass-lined interior that offers enhanced durability and resistance to corrosion, extending the lifespan of the unit.

Another important characteristic of the AOSRE50400 is its large capacity. With a tank size of 50 gallons, it can effectively meet the hot water demands of medium to large households or businesses. This capacity allows for simultaneous usage across multiple outlets, ensuring that you never run out of hot water when you need it most.

The digital display and user-friendly interface provide homeowners with easy control over temperature settings and operation modes. This feature enhances user convenience and allows for customized hot water delivery that can cater to specific usage needs. Furthermore, the built-in diagnostic system alerts users to any potential issues, ensuring timely maintenance and reducing the risk of costly repairs.

A.O. Smith also prioritizes safety in the design of the AOSRE50400. It comes with multiple safety features, including a temperature and pressure relief valve, which helps prevent potential overpressure situations. This commitment to safety ensures peace of mind for users and compliance with local plumbing codes.

In summary, the A.O. Smith AOSRE50400 water heater exemplifies modern engineering and technology, offering high energy efficiency, a durable design, user-friendly controls, and a strong commitment to safety. Its large capacity and advanced features make it an exceptional choice for those seeking reliable and efficient hot water solutions.
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