Figure 12:

Wires

Element

Screws

4.Remove the access cover(s), then remove the foam insulation block.

5.Remove the protective plastic cover(s) over the elements from their attachment point.

6.Disconnect the electrical wires from the heating element(s) by loosening the screws (Figure 12). Remove the screw-in element(s) by turning the element(s) counterclockwise with a 1-1/2 inch socket wrench. Remove the existing gasket(s).

7.Clean the area where the gasket(s) fits to the tank and internal threads. If you are replacing the bottom element, remove any accumulated sediment on the bottom of the tank.

8.Make sure the replacement element(s) has the correct voltage and wattage rating by matching it to the rating plate on the water heater. Position the new gasket(s)

on the element and insert it into the water heater tank (Figure 13).

NOTE: Apply a light coat of hand dishwashing soap and water to the gasket. Tighten the element by turning it clockwise until secure.

9.Close the drain valve and open the nearest hot water faucet. Then open the cold water shut off valve and allow the tank to fill completely with water. To purge the lines of any excess air and sediment, keep the hot water faucet open for 3 minutes after a constant flow of water is obtained.

Figure 13: Screw-in

ElementSpud

Gasket

10.Check for leaks around the element(s).

11.Reconnect the electrical wires to the element and securely tighten the screws (See Figure 12).

12.Replace the protective plastic cover(s) removed earlier. Make sure the cover(s) are securely engaged on the attachment point(s).

13.Replace the foam block(s) and access cover(s).

14.Although this water heater is equipped with “Dry Fire” protection circuitry, be sure tank is completely filled with water before applying electrical power to the water heater.

15.Reconnect electrical power to the water heater at the circuit breaker/fuse box.

16.Press the power button to turn the water heater on. Set the desired water temperature and operating mode. NOTE: The water heater will conduct a system diagnostic (approximately 8 minutes) prior to operation.

Routine Preventive Maintenance

At least monthly, a visual inspection should be made of the following:

•Air Filter (Remove and inspect, clean if needed, and reinstall).

•Condensate drain pan and condensate lines.

•The lower metal drain pan for standing water which may indicate a clogged condensate drain pan, condensate lines, or plumbing leak.

•Leaking or damaged water piping.

•Presence of corrosive materials in the installation area.

•Presence of combustible materials near the water heater.

•After servicing this water heater, check to make sure it is working properly. (See “Operating Your Water Heater” section of this manual.)

IMPORTANT: If you lack the necessary skills required to properly perform this visual inspection, you should not proceed, but get help from a qualified person.

Cleaning the Heat Pump

Air Filter Cleaning/Replacement

IMPORTANT: Before attempting to clean or replace the air filter press the power button to place the water heater in Standby Mode and turn-off power to the water heater at the circuit breaker/fuse box.

1.Locate the screw securing the filter panel to the heat pump shroud and loosening it.

2.Remove (slide) the filter from the unit.

3.If you are replacing the filter skip to step 4. To clean the filter use a vacuum with a hose attachment to remove any dust or debris.

4.Place the new or cleaned filter into the water heater and secure the filter to the shroud with the screw loosened earlier.

NOTE: The guides/slots when inserting the filter into the water heater.

5.Restore power to the water heater and press the power button to turn the water heater on. NOTE: the water heater will conduct a system diagnostic prior to operation.

Inspection/Cleaning of the Condensate Drain Pan & Condensate Drain Lines

IMPORTANT: Before attempting to clean or replace the condensate drain pan or lines press the power button to place the water heater in Standby Mode and shut-off power to the water heater at the circuit breaker/fuse box.

1.Remove the access panel (fan side) by loosening the screws securing it to the unit.

2.Check the condensate drain pan and drain lines for any dirt or debris that might interfere with proper drainage. Wipe out any dirt or debris with a damp cloth.

3.Once the condensate drain pan and lines have been inspected/cleaned, secure the access panel to the water heater.

4.Restore power to the water heater and press the power button to turn the water heater on.

NOTE: The water heater will conduct a system diagnostic prior to operation.

15

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A.O. Smith 318257-000, PHPT-80 Cleaning the Heat Pump, Routine Preventive Maintenance, Air Filter Cleaning/Replacement
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318257-000, PHPT-80 specifications

The A.O. Smith PHPT-80,318257-000 is a highly efficient water heater designed to meet the needs of both residential and commercial applications. This unit features a capacity of 80 gallons, making it suitable for larger households and businesses requiring a significant supply of hot water. The PHPT-80 stands out for its innovative technologies, versatility, and durability.

One of the key features of the PHPT-80 is its high energy efficiency. This model utilizes advanced insulation technology that minimizes heat loss, making it an excellent choice for energy-conscious consumers. In addition, the heater is equipped with a powerful and efficient heating element that ensures rapid recovery times, allowing for a continuous supply of hot water even during peak usage periods.

The PHPT-80 also incorporates a user-friendly digital display that provides real-time information about the unit's performance. This feature enables users to monitor water temperature settings, energy usage, and maintenance alerts, enhancing convenience and ensuring optimal operation. Furthermore, the heater includes a self-diagnostic system that assists in troubleshooting and ensures that the system runs smoothly.

Safety is another critical aspect of the design of the A.O. Smith PHPT-80. It includes a comprehensive set of safety features such as a temperature and pressure relief valve, an over-temperature protection system, and a flame arrestor. These features help minimize the risk of accidents and ensure peace of mind for users.

Constructed with high-quality materials, the PHPT-80 boasts durability and longevity. Its tank is lined with a corrosion-resistant coating and insulated to protect against external elements and prolong its lifespan. Additionally, it features a robust commercial-grade thermostat that allows for precise temperature control.

A.O. Smith's commitment to sustainability is also reflected in the PHPT-80. The unit is designed to be eco-friendly, contributing to lower utility bills and reduced environmental impact. The heater complies with stringent industry standards, making it a responsible choice for consumers looking to reduce their carbon footprint.

With its blend of energy efficiency, advanced technology, user-friendly features, and robust safety mechanisms, the A.O. Smith PHPT-80,318257-000 water heater represents a reliable solution for those in need of a high-capacity hot water supply. Whether for residential or commercial use, this model delivers exceptional performance and reliability, making it a top choice among water heater options.
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