A.O. Smith Dve-52/80/120 Temperature Regulation, High Temperature Limit Controls ECO

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TEMPERATURE REGULATION

HIGH TEMPERATURE LIMIT CONTROLS (ECO)

Both the ELECTRONIC CONTROL and SURFACE MOUNT CONTROL model water heaters are equipped with one or more ECO (energy cut off) non adjustable high temperature limit control(s). An ECO is a normally closed switch that opens (activates) on a rise in temperature. If the ECO switch contacts open (activate) due to abnormally high water temperatures it will lock-out and disable further heating element operation. It is important that a qualified service agent be contacted to determine the reason for the ECO activation before resetting the ECO. Once the reason has been determined and corrected the ECO(s) can be reset as follows:

Surface Mount Control Models

Surface Mount Control models have multiple surface mounted Thermostat/ECO combination controls. One for each installed heating element - see the Surface Mount Control wiring diagrams in this manual. The ECO high temperature limit switch contacts on each control will open when the tank temperature reaches approximately 200°F/93°C. When the ECO switch contacts open (activate) voltage to ONE heating element ONLY is terminated to prevent further heating operation of that element. Voltage may still be present at other heating elements and they may still be heating the water.

The ECO is a manual reset switch. Should one or more ECO activate, the tank temperature must drop below 120°F/49°C before an ECO can be reset. To manually reset an ECO:

1.Disconnect the power supply to the water heater.

2.Allow the tank temperature to cool below 120°F/49°C.

3.Remove the front control cover from the effected control(s).

4.Press the manual reset button on each of the effected controls.

Once the control(s) has been reset the control cover should be replaced prior to restoring power to the water heater.

Electronic Control Models

The ECO high temperature limit switch is located inside the immersion Temperature Probe (two red wires) on ELECTRONIC CONTROL models. The ECO switch contacts will open when the water temperature reaches approximately 202°F/94°C. When the ECO switch contacts open (activate) the electronic control system locks out and displays a Fault message. Voltage to the contactor coils and heating elements is terminated to prevent further heating operation.

Should the ECO activate, the water temperature must drop below 140°F/60°C before the control system can be reset. Once the water temperature has cooled below this point the power supply to the water heater must be turned off and on again to reset the control system.

THERMOSTAT CONTROLS

The water heaters covered in this instruction manual are equipped with adjustable thermostat controls to control water temperature. Hot water temperatures required for automatic dishwasher and laundry use can cause scald burns resulting in serious personal injury and/or death. The temperature at which injury occurs varies with the persons age and duration of exposure. The slower response time of children, the elderly or disabled persons increases the hazards to them. Never allow small children to use a hot water tap or draw their own bath water. Never leave a child or disabled person unattended in a bathtub or shower.

The water heater should be located in an area where the general public does not have access to set temperatures.

Setting the water heater temperatures at 120°f will reduce the risk of scalds. Some States require settings at specific lower temperatures.

THERMOSTAT SETTINGS - SURFACE MOUNT CONTROL

These models have multiple thermostat/ECO combination controls one for each heating element installed. These thermostats are set from the factory at 140°F/60°C. Set the thermostat dial at the lowest setting which produces an acceptable hot water supply. This will always give the most energy efficient operation.

Figure 4 shows the approximate time-to-burn relationship for normal adult skin.

Temperature

 

Time to Produce 2nd & 3rd

Settings

 

Degree Burns on Adult Skin

 

 

 

180°F (82°C)

 

Nearly Instantaneous

160°F (71°C)

 

About 1/2 second

150°F (66°C)

 

About 1-1/2 seconds

140°F (60°C)

 

Less than 5 seconds

130°F (54°C)

 

About 30 seconds

120°F (49°C)

 

More than 5 minutes

80°F (27°C)

 

- - - - - - - - - - - - - - - -

 

FIGURE 4

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Contents Installation Operation Service Maintenance Limited Warranty OptionalSafe INSTALLATION, USE, and Service Qualified Installer or Service AgencyImportant Definitions Ansi Z223.1 2006 SecGeneral Safety Information PrecautionsHydrogen GAS Flammable Grounding InstructionsTable of Contents IntroductionDRE/DVE Model Differences StandardBTU KW Input Hour 100 110 120 130 140Approvals Model and RatingFeatures and Components Surface Mount Control Models Locating the NEW Water Heater Facts to Consider About the LocationInstallation Thermal Expansion Water Line ConnectionsClosed Water Systems Electrical 16. Allowable Ampacities of Insulated ConductorsControl CIRCUIT- Electronic Control Models Amperage TABLE/OVERCURRENT ProtectionHeater Circuits Electronic Control Models Wiring Diagrams Power Circuit Diagrams Electronic Control Models Conversion to Single Phase Conversion to Three Phase Nine Element Single and Three Phase DiagramPower Circuit Diagrams Surface Mount Control Models Conversion to Single Phase Nine Elements Single and Three Phase DiagramOperation GeneralFilling the Water Heater Initial Start UPTemperature Regulation High Temperature Limit Controls ECOThermostat Settings Surface Mount Control Thermostat ControlsThermostat Settings electronic CONTROLs Control System FeaturesElectronic Control Models Operation Control System NavigationDiscreet Menu Contact Information From the Desktop Screen Status Icons DescriptionTemperatures Menu Operating StatesState Description Control System MenusTemperature Settings Differential SettingsOperating Sequence Tank Probe OffsetEconomy Mode Setup Menu Heater Status MenuEconomy Mode Settings Setpoint Adjustment ValueTime Clock Settings Daily Operating Mode Settings Alarm Output Setup Menu Display Settings MenuHeater Information Menu TOP of Menu Bottom of MenuCurrent Fault / Alert Menu Fault Occurrence MenuFault History Menu Restore Factory Defaults MenuRestore Factory Defaults MaintenanceAnode Inspection and Replacement Maintenance Schedule FlushingSediment Removal Lime Scale RemovalTroubleshooting Checklist ChecklistReplacement Parts Not enough or no hot waterLeakage Checkpoints Piping Diagrams ONE Temperature with Circulating LoopPiping Diagrams Piping Diagrams TWO Temperature with Mixing Valve Circulating Loop Piping Diagrams Piping Diagrams Piping Diagrams Manifold Kits Manifold Kits TWO HeatersThree Heaters Four HeatersWarranty Tank

Dve-52/80/120 specifications

The A.O. Smith DVE-52/80/120 is an innovative water heater designed to meet the diverse needs of both residential and commercial applications. Known for its efficiency and reliability, it stands out in the market due to its advanced features and cutting-edge technologies.

One of the main characteristics of the DVE series is its high energy efficiency, contributing to lower energy bills and a smaller carbon footprint. The units are designed with a high-efficiency burner that can achieve an energy factor (EF) rating significantly above average, ensuring more hot water is produced for less fuel consumption. This makes the A.O. Smith DVE-52/80/120 an environmentally friendly choice without sacrificing performance.

These water heaters also incorporate a unique flame rod technology that enhances the safety and reliability of the system. This feature continuously monitors the ignition of the burner and ensures an optimal combustion process, contributing to both safety and performance. Moreover, their design includes an advanced digital control system that facilitates ease of use and precise temperature management, allowing users to customize their hot water needs efficiently.

The construction of the DVE series is robust, featuring a durable glass-lined tank that resists corrosion and extends the lifespan of the heater. Insulation is another highlight, as A.O. Smith employs thick foam insulation to minimize heat loss, further improving efficiency.

The DVE-52/80/120 models also come equipped with various capacity options, catering to different household sizes and usage patterns. Whether for a small home or a larger establishment, the flexibility in capacity ensures users have consistent hot water availability according to their demands.

Additionally, the A.O. Smith DVE series is compatible with various smart home systems, making it an ideal choice for modern households seeking integrated solutions. The compatibility with Wi-Fi allows for remote monitoring and control, giving users greater convenience and peace of mind.

In summary, the A.O. Smith DVE-52/80/120 water heater is engineered with advanced technologies and reliable features that ensure optimal efficiency, safety, and performance, making it a smart investment for any hot water needs. Its blend of durability, customizable capacity, and smart technology integration positions it as a leading choice in the water heating market.
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