A.O. Smith W/HOT instruction manual Blower Assembly Installation, Installation of Vent System

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The condensate trap may be primed by filling the CONDENSATE U- ASSEMBLY with tap water using the supplied hose while the water heater is not operating. The system is fully primed when the hose is lowered below the hose clamp on the side of the water heater and water begins to flow out of the hose. In most installations the water heater will self-prime the condensate trap during the first full heat-up cycle. If a sound of air bubbling through water (gurgling) is heard while the blower is operating after the first heat-up cycle, then turn the unit off and contact your plumber or service representative.

If these instructions are not followed, the condensate build-up will block the exhaust outlet, which will cause improper operation.

CONDENSATE SYSTEM - FIGURE 16

Condensate is likely to form in the venting system attached to this water heater. The vent pipe should be sloped downward away from the blower assembly (not less than 1/8" (3.2 mm) nor greater than 1/2" (12.7 mm) per foot (30 cm) maximum). If the vent piping is vented level or sloped upwards away from the blower assembly, then adequate means for draining and disposing of the condensate needs to be made by the installer. In either case, a 3/8" drain hose should be connected to the built-in drain port. Prior to operating the water heater, make sure the removable cap is installed on the second drain port, see Figure 17.

BLOWER ASSEMBLY INSTALLATION

1.Thispowerventedwaterheatercomeswiththeblowerassemblyinstalled.

2.After the unit is set in place, make sure the blower assembly is still mounted securely. Also make sure that one of the drain ports of the rubber boot vent adapter is capped off. Lastly, make sure there is no damage to the blower.

3.Condensate drains from two locations on the blower assembly as shown in figure 17. A condensate hose must be secured to form a "trap" as shown in figure 17 for these condensate drain connections. These two hoses may be connected together. The hose(s) should be routed to a suitable drain. A fitting that may be used to join the two hoses from the blower assembly is included in a supplied kit.

FIGURE 17.

4.Make sure there is no packing material in the inlet or discharge of the blower.

5.Make sure that the plastic tubing is still attached from the air pressure switch to the port on the blower housing. Make sure the plastic tubing is not folded anywhere between the pressure switch and the blower housing.

6.Make sure the ON/OFF switch is in the OFF position and that the outer harness is connected from the blower control box to the connector on the bottom side of the gas valve.

7.If the outer harness is not factory installed, make sure the ON/ OFF switch is in the OFF position and then connect the outer harness from the blower control box to the connector on the bottom side of the gas valve.

8.Do not plug in power cord until vent system is completely installed. The Power Vent operates on 110-120 Vac. therefore a grounded outlet must be within reach of the 6 foot (1.8 m) flexible power cord supplied with the vent (See Figure 1). The power cord supplied may be used on a unit only where local codes permit. If local codes do not permit use of flexible power supply cord:

A.Make sure the unit is unplugged from the wall outlet. Remove the plastic top cap. Remove screws and open panel on the front of the control box on the blower.

B.Cut the flexible power cord, leaving enough to be able to make connections. Remove the strain relief fitting from the box.

C.Install a suitable conduit fitting inside the enclosure.

D.Splice field wiring into existing wiring using code authorized method (wire nuts, etc).

E.Be certain that neutral and line connections are not reversed when making these connections.

F.Ground heater properly. This water heater must be grounded in accordance with the National Electrical Code NFPA 70 or the Canadian Electrical Code C22.1 and/or local codes. These must be followed in all cases.

The water heater must be connected to a grounded metal, permanent wiring system; or an equipment grounding conductor must be run with the circuit conductors and connected to the equipment grounding terminal or lead on the water heater, see Figure 19.

G.Close the panel on the control box. Make sure that the access panel is secured shut.

9.The blower discharge boot is made to accept only straight sections of 2" pipe. To start off with an elbow, a short section of the furnished pipe, a minimum of 2 inches (5.1 cm), must be cut and glued into the end of the elbow that will mount on the discharge boot.

INSTALLATION OF VENT SYSTEM

Before beginning installation of piping system thoroughly read the section of this manual VENT PIPE PREPARATION.

If you are installing your system so that it vents through roof, please refer to section titled INSTALLATION OF VERTICAL VENT SYSTEM.

VENT TERMINAL INSTALLATION, SIDEWALL

1.Install the vent terminal by using the cover plate as a template to mark the hole for the vent pipe to pass through the wall. BEWARE OF CONCEALED WIRING AND PIPING INSIDE THE WALL.

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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 ContentsReplacement Parts and Deliming Products Typical InstallationRelief 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 SeeChemical Vapor Corrosion Installing the NEW Water HeaterWater Piping Valve and Pipe Insulation if supplied TEMPERATURE-PRESSURE Relief ValveGAS Piping GAS Piping with Flexible ConnectorVenting Vent Pipe AssemblySediment Traps Filling the Water HeaterCanadian Horizontal Vent Clearances Vent Pipe Termination Horizontal Vent ClearancesVent Hoods MAY be Extremely HOT During Operation Condensate Planning the Vent SystemInstallation of Vent System Blower Assembly InstallationVent 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 DisplayStart UP Conditions For Your InformationOperational Conditions Burner Operation and Inspection Periodic MaintenanceBurner Cleaning Venting System InspectionAnode ROD Inspection TEMPERATURE-PRESSURE Relief Valve OperationDraining 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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