A.O. Smith VB/VW- 750, VB/VW- 1000 UIM LED’s, Fault Messages and Troubleshooting Guide

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•Up and Down Keys:

These keys are used to move upwards and downwards in screens to reach a desired item and to change setpoints and user settings. They have an auto increment/decrement feature for some of the configurations and values. When you first press one of the keys and value changes by 1 count, then wait 1/2 second and changes slowly until the key is released or if held for 3 or more seconds it will change the value quickly.

•Help Key:

Pressing the Help key from any screen displays helpful information about that screen. From the menu screen, general help information is displayed as to how to use the user interface. To return to the previous screen press the Help or Select keys, or press Menu key to go to the menu screen. If a small down arrow appears in the lower right hand corner then there is off screen content below what is displayed. Press the down arrow to scroll down to this information. After scrolling down an up arrow will appear in the upper right hand corner to indicate off screen content above what is displayed.

UIM LED’s

The three LED’s to the right of the LCD indicate the status of the overall system. The red LED indicates that a fault

has been detected and the system has stopped running. It is on continuously for soft faults and flashes for hard faults. The Yellow LED indicates that the boiler is in a ready mode waiting for a call for heat command. When on continuously the Green LED indicates that the system is in the heating mode. If it is flashing it indicates that the UIM is in the initialization mode and the touch switches are being calibrated.

The VF® boiler has a display on the UIM which is a scaled display indicating the current firing rate of the boiler (25% to 100%).

Fault Messages and Troubleshooting Guide

The EMC 5000 modulation system does excessive self- diagnostics and displays detected faults on the UIM display in an easy to read manner. There are approximately 80 different faults that can be detected. Some of the faults are caused by internal problems and some by external causes. The faults create different types of system lockouts (shut down). Hard lockouts are serious problems that require the user to manually restart the system. Soft lockouts can be reset by the user or after 60 minutes the system will automatically clear the error and restart. Auto Reset lockouts will monitor the cause of the fault and it the fault clears itself the system resets itself. The following table shows the fault messages and some possible troubleshooting hints:

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Contents Models Safe INSTALLATION, USE and Service General Safety GAS and Electrical Characteristics Dimension and capacity dataCapacity and Flow data Recovery CapacitiesIntroduction ContentsGrounding Instructions PrecautionsHigh Altitude Installations Field Installed ComponentsControl Components Circulating Pump Water Temperature Limit ControlsON/OFF Switch Temperature ProbesVB HOT Water Heating BOILERS, are shipped with a 50 psi Required AbilityLocation Panels and CoversAir Requirements Breathing Hazard Carbon Monoxide Gas Installtion ClearancesChemical Vapor Corrosion LevelingOutdoor Air Through Two Vertical Ducts Outdoor Air Through Two OpeningsOutdoor Air Through One Opening OutdoorAir Through Two HorizontalDuctsAir From Other Indoor Spaces Power Vent Termination Clearances Sidewall Power VentDirect Vent Termination Clearances Sidewall Direct VentVenting System Using AL 29-4C Special Installation ConsiderationsConnecting Vent to Boiler Horizontal Installtion Requirements Vertical Installation RequirementsVenting Supports Vertical Termination BELOW. Keep Clear of ALL Obstructions Direct Vent Installation RequirementsDirect Vent Horizontal Direct Vent Using TWT with Vertical Intake General System installationHot Water Heating Hydronic Equipment Thermal Expansion Closed System Remote Probe Installation ProcedureInternal Contaminants Hard Water ConditionsGas Supply Line Sizing Gas ConnectionsTypical PRIMARY, Secondary Piping ONE VF Model VW HOT Water Supply Boiler with Vertical Tank ONE VF Model VW HOT Water Supply Boiler with Horizontal Tank Wiring Suggested Pipe Size For Multiple Gas Appliances Propane Gas Suggested Pipe Size For Multiple Gas Appliances Natural GasConnection Diagram Wiring DiagramPage VB/VW-500, 750 & 1000 Schematic Diagram Purging Gas Line Filling and Purging of Heating Boiler InstallationFilling Hot Water Supply Boiler Installation OperationRisk of Scalds Water Temperature RegulationMCB/FCB Dipswitches MCB Ten Position DipswitchMCB Three position Dipswitch Lighting & Operation Instructions for Models VB/VW 500, 750 Propane AdjustmentSetting of the Test Mode High Fire Setting Natural GASInputs to MCB Operating Sequence Temperature Setpoints System Control AlgorithmUIM Operating Procedures Description of FCB control states OperatingSetpointAdjustmentProcedureHighLimitDifferentialSetpointAdjustment Procedure UIM LED’s Fault Messages and Troubleshooting GuideFault Displayed Description Red LED Lockout Troubleshooting Ignition SystemTroubleshooting Gas Valve Preventative maintenanceMain Burner Blower Compartment Burner MaintenanceRelief Valve Combustion Air FilterReplacement Parts Venting MaintenanceHeatExchangerPreventativeMaintenance Tube Cleaning Procedure Mechanical Removal of DepositsPage Page Page Limited Warranty Tennessee Waltz Parkway, Ashland City, TN Phone

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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