operation

Important

Only qualified personnel shall perform the initial firing of the boiler.

At this time the user should not hesitate to ask the service agent any questions regarding the operation and maintenance of the unit. If you still have questions, please contact the factory or your local A.O. Smith representative.

Lighting and Operating instructions are included with this manual. By using these instructions, the user may be able to make minor operational adjustments and save unnecessary service calls. However the user should not attempt repairs, but should contact a service technician or gas supplier.

General

Never operate the boiler without first making sure the boiler and system are filled with water, in addition:

For hot water supply installations:

•Make sure a temperature and pressure relief valve is installed at the boiler and, if used, the storage tank. Also check for leaks.

For heating boiler installations:

•Make sure that the boiler and system have been purged of air and checked for leaks.

Also be sure to check the gas piping for leaks before beginning the initial firing of the boiler.

Filling and Purging of Heating Boiler Installation

1.Fast fill system through bypass until pressure approaches desired system pressure. Close bypass valve and permit pressure to be established by the pressure reducing valve.

2.Vent all high points in system to purge system of air.

Provisions should be made to permit manual venting of radiators or convectors.

Filling Hot Water Supply Boiler Installation

1.Close the system’s drain valve by turning handle clockwise.

2.Open a nearby hot water faucet to permit the air to escape.

3.Fully open the cold water inlet pipe valve allowing the boiler and piping to be filled.

4.Close the hot water faucet as water starts to flow.

5.The boiler is ready to be operated.

Purging Gas Line

Gas line purging is required with new piping or systems in which air has entered.

Inlet Gas Pressure

The inlet gas pressure is measured by removing the 1/8” NPT Plug located on the main gas manifold which is upstream of the unit’s gas valve, and insert a 1/8” NPT hose barb fitting to be connected to a manometer or pressure gauge. Once pressure has been checked and/ or adjusted, replace the plug and check for leaks. The maximum value specified in the table must not be exceeded. The minimum values, shown in Table 1, must be maintained under both load and no load conditions (static and firing conditions). The combination gas valves supplied with the boiler are for low pressure service. If upstream pressure exceeds 14.0” W.C., an intermediate gas pressure regulator of the lockup type must be installed.

FIGURE 19. GAS TRAIN ASSEMBLY.

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A.O. Smith VB/VW- 750 Operation, Filling and Purging of Heating Boiler Installation, Purging Gas Line, Inlet Gas Pressure
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VB/VW- 1000, VB/VW- 750 specifications

A.O. Smith is a renowned name in the water heating industry, and their VB/VW-750 and VB/VW-1000 models reflect the cutting-edge advancements in both design and functionality. These commercial water heaters stand out due to their innovative features and robust characteristics, making them ideal solutions for various applications in commercial settings.

The VB/VW-750 and VB/VW-1000 models are designed with high efficiency in mind. They utilize advanced heat transfer technology that maximizes energy use, translating to significant savings on utility bills. These units are engineered to deliver consistent hot water supply, essential for businesses such as restaurants, hotels, and manufacturing facilities where extensive hot water demands are necessary.

One of the standout features of the VB/VW models is their high recovery rate. This means they can produce a large volume of hot water within a short period, catering to peak demand times without compromising performance. Additionally, the units come equipped with a durable tank made from high-quality materials to resist corrosion, which ensures a long lifespan and reliability in service.

The VB/VW-750 and VB/VW-1000 are also equipped with advanced control systems. These systems provide precise temperature regulation, improving safety and energy efficiency. The smart pumping system further enhances performance by optimizing water flow and reducing energy consumption during operation.

Maintenance and serviceability are key characteristics of these models. They feature easy access to critical components, allowing for quick inspections and repairs. This design consideration minimizes downtime, which is crucial for any business reliant on continuous hot water supply.

Both models are compliant with various industry standards, including energy efficiency regulations. A.O. Smith has focused on ensuring these water heaters not only meet but exceed these requirements, contributing to sustainability efforts.

In summary, the A.O. Smith VB/VW-750 and VB/VW-1000 models combine efficiency, reliability, and ease of maintenance. Their advanced features and cutting-edge technologies make them a top choice for commercial hot water applications, positioning A.O. Smith as a leader in the water heating industry. With their strong performance and durability, these models are designed to meet the demands of modern businesses while providing peace of mind regarding hot water availability.
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