A.O. Smith VB/VW- 750, VB/VW- 1000 MCB Ten Position Dipswitch, MCB/FCB Dipswitches

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MCB - Ten Position Dipswitch:

Dipswitch configurations are READ ONLY ON POWER UP. These switches are only to be set at the factory or by authorized trained personnel! Once set the boiler will operate according to the chosen options. If a switch is changed, power must be cycled before the change will take effect. The status of all dipswitches can be observed on the system status screen on the UIM.

TABLE 9. - MCB/FCB Dipswitches:

Dipswitch Function

 

 

Switch Position

 

 

 

Hot Water Boilers

Hydronic Heating Boiler

Switch 1: Selection of the type of boiler application:

On

=

VB

Off

=

VW

Switch 2: Trials for ignition:

On

=

3

Off

=

1

Switch 3: IRI Gas Valve Not Available:

 

 

 

 

 

 

Switch 4: Controlling Probe:

On

=

Tank (Remote)

Off

=

Inlet

Switch 5: Powered Venter:

On =

Yes

Off =

No

Switch 6: Low Water Cut Off: (LWCO)

On =

Yes

Off =

No

Switch 7: Low Gas Pressure

On =

Yes

Off =

No

Switch 8: Modulation:

On

 

 

 

 

 

NOTE: If the unit powers up with the number of stages selected by dip switches exceeding the number of FCBs, the MCB will detect this condition and go into a hard lockout. After changing the dipswitches, the power must be cycled off and back on to accept any changes.

Example of Dipswitch configuration:

VB model, 1ignition trial, not used, tank / remote probe, no power vent, No LWCO, no low gas pressure, modulation, not used, not used.

MCB - Three position Dipswitch:

This dipswitch is similar to the MCB dipswitches described above, but with only three switches being used: the number of blower speeds (switch #3), Hi Gas option (switch #2) and a spare (switch #1). Only the blower speed and Hi Gas options are the required selection, within the MCB, see Figure 17.

TABLE 10.

Dipswitch Function:

 

 

Dipswitch Position

 

Switch 1: Spare:

 

 

 

 

 

 

Switch 2: Hi Gas pressure switch:

On

=

Yes

Off

=

No

Switch 3: Number of Blower Speeds:

On

=

1 speed,

Off

=

2 speed

Example of Dipswitch configuration:

No High Gas, 1 blower speed.

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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 VentConnecting Vent to Boiler Special Installation ConsiderationsVenting System Using AL 29-4C Venting Supports Vertical Installation RequirementsHorizontal Installtion Requirements Vertical Termination BELOW. Keep Clear of ALL Obstructions Direct Vent Installation RequirementsDirect Vent Horizontal Direct Vent Using TWT with Vertical Intake Hot Water Heating Hydronic Equipment System installationGeneral 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 Three position Dipswitch MCB Ten Position DipswitchMCB/FCB Dipswitches 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 SystemMain Burner Preventative maintenanceTroubleshooting Gas Valve 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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