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 not be exposed to freezing temperatures.

•Shall be of material listed for hot water distribution.

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

•Must terminate a maximum of six inches above a floor drain or external to the building. In cold climates, it is recommended that the discharge pipe be terminated at an adequate drain inside the building.

•Shall not have any valve or other obstruction between the relief valve and the drain.

Once the boiler is installed and filled with water and the system is pressurized, manually test the operation of the pressure relief valve. See the maintenance section of this manual for instructions.

Your local code authority may have other specific safety relief valve requirements not covered below. If any pressure relief valve is re­placed, the replace­ment valve must com­ply with the current version of the ASME Boiler and Pressure Vessel Code, Section IV (“HEATING BOILERS”).

VW HOT WATER SUPPLY BOILERS, are shipped with a 125 psi (860kPa) pressure relief valve that must be in­stalled in the water out­let as near to the boil­er as possi­ble.

ThisASME-ratedvalvehasadischargecapacitythatexceedsmaximum boiler input rating and a pressure­ rating that does not exceed maximum working pressure­ shown on boiler rating plate. In addition, a CSA

design-certified and ASME-rated temperature­ and pressure (T&P)

relief valve must be installed on each and every water storage tank

in hot water supply system. The T&P relief valve must comply with

appli­cable construction provisions of Standard for Relief Valves for

Hot Water Supply Systems, ANSI Z21.22 or CSA 4.4. T&P relief­ valve

must be of automatic reset type and not embody a single-use type fusible plug, cartridge or linkage.

T&P relief valve should have a temperature rating of 210°F (99°C),

a pressure rating not exceeding lowest rated working pressure of any system compo­nent, and a discharge capacity exceeding total input of water boilers supply­ing water to storage tank.

Locate the T&P relief valve (a) in the top of the tank, or (b) in the side of the tank on a centerline within the upper 6 inches (152mm) of the top

of the tank, see Figures 14 and 15. The tapping should be threaded in accordance with the current edition of the Standard for Pipe Threads,

General Purpose (inch), ANSI/A­SME B1.20.1. The location of, or in­ tended location for, the T&P relief valve should be readily accessible for

servicing or replacement.

VB HOT WATER HEATING BOILERS, are shipped with a 50 psi

(345kPa) pressure relief valve. This relief valve must be installed­

in the water outlet as near to the boiler as possible­.

GENERAL

Required Ability

INSTALLATION OR SERVICE OF THIS BOILER REQUIRES

ABILITY EQUIVALENT TO THAT OF A LICENSED TRADES­MAN

IN THE FIELD INVOLVED. PLUMBING, AIR SUPPLY, VENTING,

GAS SUPPLY, AND ELECTRICAL WORK ARE RE­QUIRED.

Location

When installing the boiler, consideration must be given to proper location. The location selected should provide ade­quate air supply and be as centralized with the piping system as possible.

If the boiler is installed above radiation­ level, a Low Water Cutoff Device must be installed in the boiler outlet at the time of installation.

Panels and Covers

All panels and covers (e.g. control and junction box covers; front, side and rear panels of boiler, see Figure 8) MUST be in place after service and/or before operation­ of the boiler. This will ensure that all gas ignition components will be protected from water.

The VF is a low-pressure boiler (Category IV) to be used as either hot water supply (domestic/commercial water heating) or hot water heating (hydronic) application. Category IV boilers operate­ with a positive vent pressure and with a vent gas tempera­ture less than 120°F (49°C) above its dew point. Category IV appli­ances are often termed “High Efficiency”­ appliances.

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A.O. Smith VB/VW- 1000, VB/VW- 750 instruction manual Required Ability, Location, Panels and Covers
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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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