refrigerants, swimming pool chemicals, water softener chemicals, calcium and sodium chloride, waxes, and process chemicals are typical compounds which are potentially corrosive. These materials are corrosive at very low concentration levels with little or no odor to reveal their presence.

Products of this sort should not be stored near the heater. Also, air which is brought in contact with the water heater should not contain any of these chemicals. If necessary, uncontaminated air should be obtained from remote or outside sources.

CIRCULATING PUMP

Field installed circulating pumps should be of all bronze constructions.

To optimize the total storage capacity of a horizontal vessel, particularly under low draw conditions, it is recommended to utilize a pump and recirculation line sized to turn the entire storage capacity of the tank once each hour (i.e., a 600 gallon tank would require a

10 gpm pump).

INSULATION BLANKETS

Insulation blankets are available to the general public for external use on electric water heaters but are not necessary with this product. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank heaters. Your water heater meets or exceeds the EPACT and ASHRAE/IES 90.1 standards with respect to insulation and standby loss requirements, making an insulation blanket unnecessary.

Should you choose to apply an insulation blanket to this heater, you should follow these instructions below. Failure to follow these instruc- tions can result in fire, serious personal injury, or death.

•Do not cover the temperature and pressure relief (T & P) valve with an insulation blanket.

•Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference.

•Do obtain new warning and instruction labels for placement on the blanket directly over the existing labels.

TEMPERATURE-PRESSURE RELIEF VALVE

A.O. Smith Water Products Company has provided this water heater with a properly certified temperature & pressure relief valve.

The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of Listed equipment of materials as meeting the requirements for Relief Valves for Hot Water Supply Systems, ANSI Z21.22 and the ASME code.

If replaced, the valve must meet the requirements of local codes, but not less than a combination temperature and pressure relief valve certified as indicated in the above paragraph. Contact the A . O . Smith Customer Care Center for replacement temperature & pressure relief valves 800-527-1953.

The valve must be marked with a maximum set pressure not to exceed the marked hydrostatic working pressure of the water heater (150 psi = 1,035 kPa) and a discharge capacity not less than the water heater input rate as shown on the model rating plate. The temperature setting of the relief valve should not exceed 210°F.

For safe operation of the water heater, the relief valve must NOT be removed from its designated opening nor plugged.

The temperature-pressure relief valve must be installed directly into the fitting of the water heater designed for the relief valve. Provide tubing so that any discharge will exit only within 6 inches (153 mm) above an adequate drain or external to the building or structure. Be certain that no contact is made with any live electrical part. The discharge opening must NOT be blocked or reduced in size under any circumstances. Excessive length, over 30 feet (9.14 m), or use of more than four elbows can cause restriction and reduce the discharge capacity of the valve.

Do NOT place shut-off valve or other obstruction between the temperature-pressure relief valve and the tank. Relief valve discharge piping must be provided by the installer. The discharge tube must be threaded directly into the relief valve opening and routed to the nearest drain. There cannot be any valves or obstructions in the discharge piping and excessive lengths should be avoided. Improper installation of the relief valve discharge tubing can result in system failure, property damage, injury, or death.

Once the water heater is installed and filled with water, check the operation of the temperature-pressure relieve valve. Follow the instructions in the Maintenance section of this manual, see Page 15.

If after manually operating the valve it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater, follow the “Draining” instructions and replace the temperature-pressure relief valve with a properly rated/sized new one.

9

Page 8 Page 10
Page 9
Image 9
A.O. Smith DVE-150, DHE-200 instruction manual Circulating Pump, Insulation Blankets, TEMPERATURE-PRESSURE Relief Valve
Page 8 Page 10

DVE-150, DHE-200 specifications

A.O. Smith has established itself as a leading brand in the water heating industry, and its DVE-150 and DHE-200 models showcase the company's commitment to efficiency and innovation. Both units are designed to cater to residential and commercial water heating needs, offering a range of features that enhance performance and reliability.

The DVE-150 is a high-efficiency electric water heater that boasts a 150-gallon capacity. It is ideal for larger households or small commercial applications where hot water demand is significant. One of the standout features of the DVE-150 is its advanced heating element technology. This model uses high-density insulation that reduces heat loss, ensuring more effective energy use. The unit operates at a high recovery rate, allowing it to provide consistent hot water quickly, even during peak usage times.

On the other hand, the DHE-200 is a gas water heater, equipped with a 200-gallon capacity. This model is ideal for high-demand environments where large volumes of hot water are required. The DHE-200 incorporates an innovative direct vent system that enhances efficiency and safety by removing combustion gases from the living space. The modulating gas burner further ensures that the unit operates at optimal efficiency, adjusting the heat output based on the demand for hot water.

Both models feature an intuitive digital display that allows users to monitor and adjust their settings easily. Additionally, they come with advanced diagnostic tools that provide real-time feedback on the system's performance, making maintenance easier and more efficient.

Safety is a top concern for A.O. Smith, and both the DVE-150 and DHE-200 are designed with multiple safety features. These include high-temperature limit switches, pressure relief valves, and flame rollout switches, all of which work to protect the unit from potential hazards.

In terms of installation, both models offer flexible options. They are designed to fit in various spaces, accommodating different installation environments. This versatility is essential for both new constructions and retrofitting older systems.

The DVE-150 and DHE-200 are also backed by A.O. Smith's industry-leading warranty, providing customers with peace of mind regarding their investment. Overall, these models embody A.O. Smith's dedication to quality, efficiency, and safety, making them excellent choices for those in need of reliable water heating solutions.
Top Page Image Contents