Circulating Pump

FIGURE 8

The flow switch shall be mounted in the top opening of the reducing tee and provide adequate paddle length in the flow stream. For example in a 2" pipe installation use a 2" x 2" x 1" reducing tee. For 2" or 3" pipe use the paddle segments as supplied. For other pipe sizes (i.e. 2-1/2") trim the paddle to the proper pipe size, see fig. 8. If a standard tee is used, install a face or hex bushing in the top opening. The paddle must be adjusted or trimmed to the size of the pipe in which it will be installed.

CAUTION

The paddle must not touch any part of the tee into which it is installed. Screw the flow switch in position so the flat of the paddle is at right angles to the flow. The arrow on the side case must point in the direction of the flow.

To adjust the flow rate setting:

1.Remove the flow switch cover.

2.For higher flow rate— turn the range adjusting screw clockwise.

3.For lower flow rate— turn the range adjusting screw counterclockwise.

Where units are installed in multiples, each boiler must be individually protected by a safety flow switch.

Dura-Max boilers are designed to operate over a wide range of temperatures and flow rates.

THE CIRCULATING PUMP MUST BE PROPERLY SIZED FOR YOUR APPLICATION.

Water hardness, system pressure drop and temperature rise across the boiler all affect how large a circulating pump must be.

Running "hard water" too slowly through the boiler can result in damage due to lime or scale accumulation.

Running "soft water" too quickly through the boiler can result in damage due to velocity flow erosion.

Table 4 has been designed to assist in determining operating ranges. Use this chart as a guide when sizing pumps.

FIGURE 9

Although each circulator that requires oil is oiled and operated by the manufacturer, IT MUST BE OILED AGAIN BEFORE BEING OPERATED. Oil the three oil cups (2 on the motor, 1 on the pump) as instructed on the oil tube supplied with the unit, fig. 9.

DB/DW-720-1810 specifications

A.O. Smith has a longstanding reputation for quality and innovation in the water heater industry, and the DB/DW-720-1810 model exemplifies these values. This particular water heater is designed to provide reliable hot water, making it suitable for both residential and commercial applications. Its impressive features and cutting-edge technologies set it apart from conventional models.

One of the primary features of the A.O. Smith DB/DW-720-1810 is its energy efficiency. It operates using advanced insulation technologies, minimizing heat loss and promoting energy savings. This model is designed with a high-efficiency burner that substantially reduces energy consumption while maintaining optimal performance. It also complies with industry standards for energy efficiency, ensuring that users can enjoy lower utility bills without sacrificing comfort.

The DB/DW-720-1810 is equipped with a robust tank designed to hold an ample supply of hot water. With a capacity of 75 gallons, it is ideal for households with high demand, such as multi-bathroom residences or commercial establishments. This large capacity ensures that hot water is readily available for various activities, from bathing to cleaning.

User control is another notable characteristic of the A.O. Smith DB/DW-720-1810. The model features an intuitive digital display that allows users to monitor and set water temperatures easily. This interface not only enhances usability but also promotes safety, preventing scalding by allowing users to adjust the temperature to their preference.

Durability is a key consideration in the DB/DW-720-1810’s design. It is built with high-quality materials and features a corrosion-resistant tank, ensuring longevity even in challenging water conditions. This resilience is further supplemented by A.O. Smith's advanced anode rod technology, which helps battle corrosion and extends the lifespan of the water heater.

Lastly, maintenance is simplified with this model. A.O. Smith has designed the water heater for easy access to serviceable parts, making routine maintenance more convenient and less time-consuming. Coupled with warranty options that provide peace of mind, the DB/DW-720-1810 stands out as a dependable choice.

In summary, the A.O. Smith DB/DW-720-1810 combines energy efficiency, significant capacity, user-friendly controls, durability, and low maintenance needs, making it an exceptional option for those needing a reliable hot water solution.