Lochinvar 1, 000 through 2 warranty Variable Frequency Drive, Transformer and Relay Locations

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FIG. 48 Transformer and Relay Locations

VARIABLE FREQUENCY DRIVE

FIG. 49 Internal Control Panel Location

A transformer and relay mounting panel is located above the front control panel, underneath the curved exterior front jacket panel. This panel contains a 100 VA transformer to drop 120 VAC to 24 VAC for internal control operation, an optional electronic low water cut-off, a high limit alarm relay, an alarm relay, an ignition relay, gas valve relay, pump relay, louver relay and VFD power relay.

FIG. 50 Variable Frequency Drive

This appliance uses a variable frequency drive (VFD) to control operation of the combustion air blower motor. The variable frequency drive is supplied with 120 VAC power. The blower motor operates on 230 VAC 3 phase power. This three phase voltage is generated by the variable frequency drive and supplied directly to the blower motor. The variable frequency drive receives a signal from the Excel 10 controller based on water temperature to vary the frequency of the voltage supplied to the blower motor from 15 Hz up to 60 Hz. This varies the output of the combustion air

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Contents
Warranty Special Instructions To OwnerIFB/IFW-i&s-05 Table of Contents Checking Equipment Do notWhat to do if YOU Smell GAS Owner WarningInstallation Procedure Location of Unit Recommended Service ClearancesTable a Clearances from Combustible ConstructionCombustion Air Direct from Outside Table B Minimum Recommended CombustionAIR Supply to Mechanical Room 500 in2 3226 cm2 667 in2 4303 cm2 000 in2 12,903 cm2Construction AIR Filter Construction Air FilterConstruction AIR Filter Kits Table C VentingTable D Category IV Flue Pipe SizesCategory IV Positive Pressure Venting System Category IV VentingCategory IV Flue Pipe Materials Venting Guidelines for a Category IV VentDrain Tee Installation General Category IV Vent Termination ClearancesExceed a maximum of 100 equivalent feet 30.5 m in length Masonry Chimney Installations Vertical Venting TerminationsSidewall Venting Terminations Table ESidewall Vent Cap Kits Sidewall VentLocation of a Sidewall Vent Termination Direct Vent INTELLI-VENT SystemsTable F Direct Vent and Intelli-Vent Flue Air Inlet Pipe SizesAir Inlet Length of Air Inlet PipeVertical Direct Vent Systems Combined Combustion Air Inlet PointsMultiple Vertical Direct Vent Installations Horizontal Direct VentSidewall Combustion AIR Inlet Table GLocation of a Sidewall Air Inlet Cap Multiple Horizontal Direct Vent Installations These areTable H Combined Air Inlet PointsMaximum Length of an Intelli-Vent System Air Inlet Sidewall Input Flue Pipe Btu/hr SizeHorizontal INTELLI-VENT with Vertical Combustion AIR Air Inlet Sidewall Input Flue PipeBtu/hr Size Cap Kit 500,000 SVK3026Vertical Combustion Horizontal INTELLI-VENT AIR Inlet Location of a Rooftop Air Inlet CapTable J GAS Supply GAS Pressure Test Table KGAS Connection Table LRecommended Gas Pipe Size Single Appliance Installations Multiple Appliance Installations Gas Pipe Size ChartTable M Table NGAS Manifold Pressure Adjustment Install Piping to ControlGAS Piping Checking GAS Supply PressureChecking Manifold GAS Pressure Water Connections Water ConnectionsSecondary Heat Exchanger Primary Heat Exchanger Inlet and Outlet ConnectionsMinimum Pipe Size Requirements Integral Bypass Bypass Valve SynchronizationBypass Piping Assembly Integral CirculatorOptional Intermittent Pump Operation Bypass Initial Set-up of Maximum Water FlowMinimum Water Temperatures Btu/hr Input Temperature RiseTable P Bypass OperationWater Flow Switch Table QLOW Water Cutoff GAS Train and ControlsRelief Valve Diaphragm GAS Valve Ratio GAS ValveJacket Assembly Electrical ConnectionsAccess to Components and Controls Front Control Panel LocationsVariable Frequency Drive Transformer and Relay LocationsHigh GAS Pressure Switch LOW GAS Pressure Switch Optional LOW AIR Pressure SwitchExcel Be used as a diagnostic indicator Temperature Adjustment Default Values Pre-programmed in the ExcelTable S To Activate the Manual OverridePassword Function Configuring Command DisplayTable T Display Default Values Accessing the SIX Changeable Points from Command DisplayCalculated Set Point Total Run TimeSet Point Temp Sequencing TypeCommand Display Data Screen Status Points Table UStatus Point Operational Modes Hot Surface Igniter OnOutdoor Reset Function Selections Optional on Heating Boilers OnlyMultiple Appliance Installations Efficiency Optimized with Time EqualizationSingly Terminated FTT Network Bus Topology Specifications Interfacing Multiple AppliancesTable W Wire Termination for E-Bus Connection Additional Components Used to Interface Multiple AppliancesHigh Water Temperature Limit Control Typical Building Management System DiagramService Parts HOT Surface Ignition SystemIgnition Module Lockout Functions Diagnostic Status Indication Table YIgnition and Control Timings Table ZOPERATION/DIAGNOSTIC LIGHTS, Resets and Switches IndicatorBurner Table AACombustion AIR Blower Combustion Air Blower and Transition ChamberCondensate Management System OptionalTable BB Condensate Drain Location On RearCondensate Testing Condensate Trap InstallationReplenishing the Neutralizer Install Condensate Trap Lighting InstructionsTo Turn OFF GAS to Appliance Ignition System CheckoutSequence of Operation Heat Transfer ProcessMaintenance End of SequenceBurner Removal and Cleaning Burner MaintenanceBurner Cleaning Procedure Location of Primary Heat ExchangerSecondary Heat Exchanger Inspection Lubrication Freeze Protection Heating Boiler Installations Freeze Protection for a Heating Boiler System If RequiredWater Treatment Water Connections Heating Boilers onlyPrimary Loop Circulator Pump Specifications Piping LengthsBoiler Circulator Pump Limitations Circulator Pump OperationMinimum Boiler Water Temperatures PRIMARY/SECONDARY Boiler PipingBoiler Temperature Rise Chart Table DD Table CCMaximum Flow for Heating Boiler Btu/hr Input Maximum FlowTEMPERATURE/PRESSURE Gauge Typical Heating Boiler InstallationsPlacing the Boiler Operation Installation with a Chilled Water System Boiler Operating Temperature ControlBoiler Operation Water Velocity Control Typical Water Heater Piping with Storage TankTable EE Table FFMaximum Flow Rate Btu/hr Input Water Chemistry Piping Multiple Unit Installations Single Water Heater Piping with Two Storage TanksTable GG Pump OperationHeat Exchanger Common ManifoldThermostat Settings Table HHOptional Relief Valve Thermal ExpansionCathodic Protection Ladder Diagram PWM Wiring Diagram
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