distance below the structural floor. 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 ft. (9.14m), or use of more than four elbows can cause restriction and reduce the discharge capacity of the valve, see Figures 5 or 10.

No valve or other obstruction is to be placed between the relief valve and the tank. Do not connect tubing directly to discharge drain unless a 152mm (6 in.) air gap is provided. To prevent bodily injury, hazard to life, or property damage, the relief valve must be allowed to discharge water in quantities should circum- stances demand. If the discharge pipe is not connected to a drain or other suitable means, the water flow may cause property damage.

4.When the system requires water for space heating at temperatures higher than required for domestic water purposes, a *mixing valve must be installed, see Figure 7 for suggested piping arrangement.

The Discharge Pipe:

•Shall not be smaller in size than the outlet pipe size of the valve, or have any reducing couplings or other restrictions.

•Shall not be plugged or blocked.

•Shall be of material listed for hot water distribution.

•Shall be installed so as to allow complete drainage of both the temperature-pressure relief valve, and the discharge pipe.

•Shall terminate at an adequate drain.

•Shall not have any valve between the relief valve and tank.

The temperature-pressure relief valve must be manually oper- ated at least once a year. Caution should be taken to ensure that

(1)no one is in front of or around the outlet of the temperature- pressure relief valve discharge line, and (2) the water manually discharged will not cause any bodily injury or property damage because the water may be extremely hot.

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 re- place the temperature-pressure relief valve with a new one.

WATER (POTABLE) HEATING AND SPACE HEATING

1.All piping components connected to this unit for space heating applications shall be suitable for use with potable water.

2.Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system.

3.This unit may NEVER be connected to any existing heating system or component(s) previously used with a non-potable water heating appliance.

FIGURE 7

CLOSED WATER SYSTEM

A closed system will exist if a back-flow preventer (check valve), pressure reducing valve, or other similar device is installed in the cold water line between the water heater and the street main (or well). Excessive pressure may develop due to the thermal expansion of heated water causing premature tank failure or intermittent relief valve operation. This type of failure is not covered by the limited warranty. An expansion tank may be necessary in the cold water supply to alleviate this situation, see Figure 1. Contact the local plumbing authority.

If the temperature and pressure relief valve on the appliance discharges periodically, this may be due to thermal expansion in a closed water supply system. Contact the water supplier or local plumbing inspector on how to correct this situation. DO NOT PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE.

GAS PIPING

Make sure the gas supplied is the same type listed on the model rating plate. The inlet gas pressure must not exceed 14 inch water column (3.5 kPa) for natural and propane gas (L.P.). The

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A.O. Smith GDV-50, GDVT-50, GDV-75, GDV-40 Water Potable Heating and Space Heating, Closed Water System, GAS Piping
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186589-004, GDVT-50, GDV-75, GDV-40, GDV-50 specifications

A.O. Smith is a recognized name in the water heating industry, known for its reliable and efficient water heaters. Among its notable products are the GDV-50, GDV-40, GDV-75, GDVT-50, and 186589-004 models. These water heaters offer enhanced performance, energy efficiency, and modern technologies suited for residential and commercial applications.

The GDV series includes the GDV-50, GDV-40, and GDV-75 models, which feature a robust design typically made from high-quality materials to ensure longevity. These units come equipped with advanced insulation, which minimizes heat loss and increases efficiency, making them excellent choices for households with varying hot water needs.

The GDV-50 model boasts a tank capacity of 50 gallons, making it suitable for medium to large households. It features a powerful heating element that heats water quickly, providing ample hot water for daily use. Meanwhile, the GDV-40 is designed for smaller households with a 40-gallon capacity. This model strikes a balance between size and efficiency, catering to lighter hot water demands while maintaining excellent performance.

For larger households, the GDV-75 provides a 75-gallon capacity, ensuring that even the most demanding hot water applications can be met with ease. This model is particularly ideal for families that require hot water in large quantities or at peak times.

The GDVT-50 is a versatile model that features advanced technology, such as an integrated digital display that allows users to monitor and adjust settings easily. This offers greater control over temperature settings and energy usage, making it not only convenient but also more energy-efficient.

The A.O. Smith 186589-004 is an accessory designed for specific model enhancements that improve overall performance and safety. It may include additional safety features, such as high-temperature limit switches and automatic shut-off mechanisms that provide peace of mind for users.

All these models are equipped with A.O. Smith’s innovative technologies, including advanced thermostat controls and durable components designed to withstand frequent use. They typically come with generous warranties, underscoring the manufacturer's commitment to quality and customer satisfaction.

In summary, A.O. Smith water heaters, particularly the GDV-50, GDV-40, GDV-75, GDVT-50, and 186589-004, are built for efficiency, reliability, and performance. With various capacities and the latest technologies, they cater to the diverse needs of homeowners and businesses, ensuring that hot water is always available when needed.
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