A.O. Smith DB/DW-720-1810 warranty Spark AT Pilot Burner but Pilot will not Light

Page 37

Attach wires firmly.

Replace gas valve.

Turn on power supply.

Securely connect cable and/or ground wire.

Replace cable and/or ground wire.

Carefully bend down- wards top of ground strap to achieve 1/8" spark gap.

Replace pilot burner.

Replace ignition module.

SPARK AT PILOT BURNER BUT PILOT WILL NOT LIGHT

Ensure all manual shutoff valves are fully open; All filters are clean; All gas connections are gas tight; Pilot tubing is not damaged, obstructed or kinked; and pilot orifice is unclogged. Check for

air in gas line, purge (bleed) line if necessary.

NO

Are the wires securely attached to the pilot operator on the gas control and to the PV & MV/PV terminals on the ignition module?

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

Install a pressure gauge in the pilot tubing line between the gas

NO

control and the pilot burner assembly. Ensure that the pilot

 

adjustment screw (under cap) is adjusted to a position that will

 

 

permit gas to flow.

 

Is pilot gas flowing during ignition attempt?

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

Turn off power supply.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

Is ignition cable firmly plugged into pilot assembly and module?

 

Is ground wire firmly attached to pilot assembly and GND

 

terminal on module?

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

NO

Are ignition cable and ground wire in good condition (not brittle,

 

burnt, or cracked)?

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

Ensure ground strap is the closest metal to the igniter/sensor

 

rod (electrode) to prevent the spark from shorting out

NO

to other metal parts (pilot screen, pilot shield, etc.).

 

Ignition cable must not touch metal surfaces or current carrying

 

 

wires.

 

Is there a 1/8" gap between ground strap and electrode?

 

 

 

 

 

 

 

YES

NO

 

 

 

 

 

 

 

 

 

Is the ceramic insulator surrounding the electrode in good

 

 

condition (not cracked or broken)?

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

Is there excessive draft conditions that may cause pilot burner

 

 

ignition problems?

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

Correct draft problems in a manner that would ensure adequate

 

combustion and ventilation air and proper pilot burner performance.

 

 

 

 

 

37

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Contents TM Models DB/DW-720-1810 Installation Operation Maintenance Limited WarrantyReplacement Parts ContentsForeword Installation Clearances ROUGH-IN Dimensions CapacitiesLevelling Pressure Drop Safety Relief Valves FeaturesManual Reset High Temperature Safety Limit Control Electronic Intermittent Pilot Ignition ControlSafety Flow Switch Automatic Reset High Temperature Limit ControlThermal Balancer Dual Stage Models only HIGH/LOW OperatorRequired Ability Installation InstructionsLocation AIR RequirementsDraft Hood Venting the BoilerVent Connection GAS Connections Connecting Boiler to a Common VentCorrect GAS PurgingWiring Connections High Altitude InstallationsConventional Installations ExampleSystems Equipment Installation Circulating Pump Must be Properly Sized for Your Application Circulating PumpTank Temperature Control System InstallationConventional Space Heating Installation LOW Water CutoffInstallation AS Boiler Replacement DB InstallationPage LINEAR-TEMP Space Heating Applications LINEAR-TEMP Space Heating InstallationsDuraMax Pump Performance Requirements Thermometer Pressure Gauge Safety Flow SwitchONE Boiler LINEAR-TEMP System Page Page Page Page Page Page ONE DURA-MAX Model DW Commercial Boiler with Vertical Tank Hard Water ConditionsONE DURA-MAX Model DW Commercial Boiler with Horizontal Tank NPT NPT Manifolding of Model TJV-120M & TJV-200M Tanks START-UP and Operating Instructions For Your Safety Read Before Operating Checking and Adjusting the Input PrecautionsInternal Contaminants Pilot BurnerTROUBLE-SHOOTING PRE-TROUBLE-SHOOTINGYES No Spark AT Pilot BurnerSpark AT Pilot Burner but Pilot will not Light Pilot Burner Lights but Main Burner does not Light Venting Maintenance General MaintenanceHeat Exchanger Preventive Maintenance Relief ValveRemoving Light Deposits of Scale Deliming SolventsMechanical Removal of Deposits Removal of AN Existing Boiler from a Common Venting SystemDURA-MAX Limited Warranty Page Page Replacement Parts

DB/DW-720-1810 specifications

A.O. Smith has a longstanding reputation for quality and innovation in the water heater industry, and the DB/DW-720-1810 model exemplifies these values. This particular water heater is designed to provide reliable hot water, making it suitable for both residential and commercial applications. Its impressive features and cutting-edge technologies set it apart from conventional models.

One of the primary features of the A.O. Smith DB/DW-720-1810 is its energy efficiency. It operates using advanced insulation technologies, minimizing heat loss and promoting energy savings. This model is designed with a high-efficiency burner that substantially reduces energy consumption while maintaining optimal performance. It also complies with industry standards for energy efficiency, ensuring that users can enjoy lower utility bills without sacrificing comfort.

The DB/DW-720-1810 is equipped with a robust tank designed to hold an ample supply of hot water. With a capacity of 75 gallons, it is ideal for households with high demand, such as multi-bathroom residences or commercial establishments. This large capacity ensures that hot water is readily available for various activities, from bathing to cleaning.

User control is another notable characteristic of the A.O. Smith DB/DW-720-1810. The model features an intuitive digital display that allows users to monitor and set water temperatures easily. This interface not only enhances usability but also promotes safety, preventing scalding by allowing users to adjust the temperature to their preference.

Durability is a key consideration in the DB/DW-720-1810’s design. It is built with high-quality materials and features a corrosion-resistant tank, ensuring longevity even in challenging water conditions. This resilience is further supplemented by A.O. Smith's advanced anode rod technology, which helps battle corrosion and extends the lifespan of the water heater.

Lastly, maintenance is simplified with this model. A.O. Smith has designed the water heater for easy access to serviceable parts, making routine maintenance more convenient and less time-consuming. Coupled with warranty options that provide peace of mind, the DB/DW-720-1810 stands out as a dependable choice.

In summary, the A.O. Smith DB/DW-720-1810 combines energy efficiency, significant capacity, user-friendly controls, durability, and low maintenance needs, making it an exceptional option for those needing a reliable hot water solution.
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