A.O. Smith W/HOT instruction manual GAS Piping with Flexible Connector

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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 minimum inlet gas pressure shown on the rating plate is that which will permit firing at rated input.

All gas piping must comply with local codes and ordinances or with the National Fuel Gas Code (ANSI Z223.1/ NFPA-54) or the Natural Gas and Propane Installation Code (CAN/CSA B149.1) whicheverapplies.Copper or brass tubing and fittings (except tin lined copper tubing) shall not be used.

If the gas control valve is subjected to pressures exceeding 1/2 psi (3.5 kPa), the damage to the gas control valve could result in a fire or explosion from leaking gas.

If the main gas line Shut-off serving all gas appliances is used, also turn “off” the gas at each appliance. Leave all gas appliances shut “off” until the water heater installation is complete.

A gas line of sufficient size must be run to the water heater. Consult the current edition of National Fuel Gas Code (ANSI Z223.1/NFPA

54)or the Natural Gas and Propane Installation Code (CAN/CSA B149.1) and your gas supplier concerning pipe size.

There must be:

•A readily accessible manual shut off valve in the gas supply line serving the water heater, and

•A drip leg (sediment trap) ahead of the gas control valve to help prevent dirt and foreign materials from entering the gas control valve.

•A flexible gas connector or a ground joint union between the shut off valve and control valve to permit servicing of the unit.

Be sure to check all the gas piping for leaks before lighting the water heater. Use a soapy water solution, not a match or open flame. Rinse off soapy solution and wipe dry.

This heater is approved for operation up to 5,300 feet (1,615 m) without alteration. High altitude models are available from the factory for elevations between 5,300 feet (1,615 m) and 10,100 feet (3,079 m). For elevations above 10,100 feet (3,079 m) the input rating should be reduced at the rate of 4 percent for each 1,000 feet (305 m) above sea level which requires replacement of the burner orifice in accordance with National Fuel Gas Code (ANSI Z223.1/NFPA 54) or the Natural Gas and Propane Installation Code (CAN/CSA B149.1). Contact your local gas supplier for further information.

Failure to replace the standard orifice with a high altitude orifice when installed above 10,100 feet (3,079 m) could result in improper and inefficient operation of the appliance, producing carbon monoxide gas in excess of safe limits, which could result in serious injury or death. Contact your gas supplier for any specific changes which may be required in your area.

Use pipe joint compound or teflon tape marked as being resistant to the action of petroleum [Propane (L.P.)] gases.

The appliance and its gas connection must be leak tested before placing the appliance in operation.

The appliance and its individual Shut-off valve shall be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 pound per square inch (3.5 kPa). It shall be isolated from the gas supply piping system by closing its individual manual Shut-off valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 pound per square inch (3.5 kPa).

Connecting the gas piping to the gas control valve of the water heater can be accomplished by either of the two methods shown in Figures 12 and 13.

FIGURE 12. GAS PIPING WITH

FLEXIBLE CONNECTOR.

FIGURE 13. GAS PIPING WITH ALL

BLACK IRON PIPE TO GAS CONTROL.

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Contents Commercial GAS Water Heaters Power Vented GAS Models W/HOT Surface IgnitionImportant Definitions Safe INSTALLATION, USE and ServiceGeneral Safety General Safety Introduction Table of ContentsTypical Installation Replacement Parts and Deliming ProductsRelief Valve Elbow Access Door Condensate Hose and Drain PAN ROUGH-IN-DIMENSIONS Rough-In-DimensionsCapacity and Gas and Electrical Characteristics Mixing Valve Usage Facts to Consider about the Location Locating the NEW Water HeaterInsulation Blankets ALL AIR from Outdoors See Figures 7, 8 ALL AIR from Inside Buildings SeeInstalling the NEW Water Heater Chemical Vapor CorrosionWater Piping Valve and Pipe Insulation if supplied TEMPERATURE-PRESSURE Relief ValveGAS Piping GAS Piping with Flexible ConnectorVenting Vent Pipe AssemblySediment Traps Filling the Water HeaterHorizontal Vent Clearances Canadian Horizontal Vent Clearances Vent Pipe TerminationVent Hoods MAY be Extremely HOT During Operation Condensate Planning the Vent SystemBlower Assembly Installation Installation of Vent SystemVent Terminal INSTALLATION, Sidewall Vent Termination Figure Power Vent Wiring Schematic FigureInstallation of Vertical Vent System Installation of Vent SYSTEM, SidewallVertical VAA Installations Recommended Vent Attenuation Assembly InstallationInch vent Horizontal VAA Installations Inch vent Vertical VAA InstallationsRecommended BRUSH* Size for Primer Cement Applications Vent Pipe PreparationStep G Step BStep E Step FDo not TRY to Light the Burner by Hand Power Before ServicingBurner. Do not try to light the burner by hand What to do if YOU Smell GASD E F Temperature RegulationTemperature Indicators Temperature Adjustment Buttons DisplayFor Your Information Start UP ConditionsOperational Conditions Burner Operation and Inspection Periodic MaintenanceBurner Cleaning Venting System InspectionTEMPERATURE-PRESSURE Relief Valve Operation Anode ROD InspectionDraining Leakage Checkpoints ServiceTrouble Shooting Troubleshooting GuidelinesD E F Troubleshooting Guidelines ALL Other Parts Service and Repair ExpensesClaim Procedure Tank

W/HOT specifications

A.O. Smith, a leading manufacturer of water heating solutions, has made its mark in the industry with innovative products that combine efficiency, reliability, and advanced technology. Among its standout offerings is the A.O. Smith W/HOT series, designed to meet the diverse needs of residential and commercial customers.

The W/HOT series showcases a variety of tankless water heaters characterized by their ability to provide endless hot water on demand. Unlike traditional tank water heaters, which can run out of hot water during heavy usage, the W/HOT series ensures a constant supply, making it an ideal choice for families and businesses with high hot water needs. This feature not only enhances convenience but also optimizes energy usage by eliminating the standby heat loss associated with storage tanks.

One of the key technologies integrated into the W/HOT series is the microprocessor control system. This intelligent technology allows the unit to monitor water usage patterns and adjust operation accordingly. By optimizing heating cycles based on actual demand, this feature helps improve energy efficiency, resulting in lower utility bills without compromising performance.

The W/HOT series also incorporates advanced heat exchanger technology, enabling rapid heating of water as it passes through the system. This means minimal wait time for hot water and reduced energy consumption, as the unit only heats water when it is needed. The heat exchangers are designed for durability and effective heat transfer, helping to extend the overall lifespan of the unit.

Safety is a top priority in the design of A.O. Smith water heaters. The W/HOT series is equipped with multiple safety features, including a built-in thermal shut-off switch and safety sensors that prevent overheating. Additionally, the units are designed to comply with industry standards and regulations, ensuring peace of mind for users.

Installation flexibility is another defining characteristic of the W/HOT series. These tankless water heaters can be installed in various locations, requiring minimal space compared to traditional units. Their compact design makes them suitable for tight spaces, such as closets or utility rooms.

Overall, the A.O. Smith W/HOT series represents a commitment to innovation and quality in water heating solutions. Its combination of tankless design, advanced technology, and safety features makes it an excellent choice for those seeking efficient and reliable hot water access. Whether for residential or commercial use, A.O. Smith continues to lead the way in delivering top-tier water heating solutions that meet the evolving needs of consumers.
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