Combustion AIR Blower

Lochinvar 000 through 2, 1 Combustion AIR Blower, Combustion Air Blower and Transition Chamber

Page 52

This appliance uses a single cylindrical burner installed vertically into the cavity located in the center of the primary heat exchanger. There is a unique burner for each one of the three models.

Burners may NOT be changed between different Btu/hr input models. The burner consists of a round mounting flange welded to a mixing tube. The top side of the mixing tube provides the transition which mounts the discharge from the combustion air blower into the burner. The bottom side of the mixing tube is attached to a stainless steel perforated sleeve. This stainless steel sleeve is covered with a loose fitting, woven alloy material that forms the burner port surface. The woven burner port material is called Alcromesh which is a unique alloy of iron, chrome, aluminum and several rare earth metals. This alloy is designed to operate stress free as a burner port surface. The Alcromesh burner port surface can sustain operation from a blue flame down to infrared conditions as the burner input varies. Internally, the burner has a cone and distribution baffles to balance the air/gas mixture over the surface of the burner. The burner mounting flange provides a flame view port and the mounting point for the hot surface igniter. The hot surface igniter is removable from the burner mounting flange without removing the burner assembly from the heat exchanger.

NOTE:

An index mark is provided on the burner flange to ensure proper orientation when removing and reinstalling the burner. A properly indexed burner will ensure correct location of the combustion air blower and adequate clearances from other components in the top jacket chamber.

The burner is designed to operate from 100% of rated input down to 25% of rated input in normal operation. Burner operation at input rates of less than 50% may include operation in the infrared state. At input rates firing above 50%, there may be some slight infrared visible on the tips of the woven burner port material. This is normal burner operation.

This appliance uses a sealed air blower to provide combustion air for the burner and operate the Category IV venting system. The blower assembly consists of a sealed housing and blower wheel constructed from cast aluminum. The blower is operated by a fully enclosed 230 VAC, 3 Phase electric motor. This motor has a 3/4 HP rating on the 1,500,000 Btu/hr model and a 1 HP rating on the 1,700,000 and 2,000,000 Btu/hr models. The blower housing and motor assembly is fully sealed and CANNOT be field serviced.

ORIFICE

MOUNTING

TRANSITION

CHAMBER

FIG. 69 Combustion Air Blower and Transition Chamber

A sealed transition chamber is mounted on the inlet to the combustion air blower. This chamber contains the gas orifice and a sensing point for operation of the ratio gas valve. Inside the transition chamber, at the inlet to the combustion air blower there is a filter to prevent particulate matter and small foreign objects from entering the blower and burner. This filter should be checked and cleaned on a six month interval or more often in a contaminated environment. An inspection port is provided on the side of the transition chamber to allow access to the internal filter for inspection and cleaning. If cleaning is required, remove the filter through the inspection port and clean with soapy water or compressed air.

FIG. 68 Combustion Air Blower

Image 52

Contents

Special Instructions To Owner WarrantyIFB/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 VentGeneral Category IV Vent Termination Clearances Drain Tee InstallationExceed 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 VentTable G Sidewall Combustion AIR InletLocation 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 ConnectionsInlet and Outlet Connections Secondary Heat Exchanger Primary Heat ExchangerMinimum 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 LocationsLOW AIR Pressure Switch High GAS Pressure Switch LOW GAS Pressure Switch OptionalExcel 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 EqualizationInterfacing Multiple Appliances Singly Terminated FTT Network Bus Topology SpecificationsTable W Wire Termination for E-Bus Connection Additional Components Used to Interface Multiple AppliancesHigh Water Temperature Limit Control Typical Building Management System DiagramHOT Surface Ignition System Service PartsIgnition 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 Trap Installation Condensate TestingReplenishing 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 FlowTypical Heating Boiler Installations TEMPERATURE/PRESSURE GaugePlacing the Boiler Operation Boiler Operating Temperature Control Installation with a Chilled Water SystemBoiler Operation Water Velocity Control Typical Water Heater Piping with Storage TankTable FF Table EEMaximum 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 HHThermal Expansion Optional Relief ValveCathodic Protection Ladder Diagram PWM Wiring Diagram

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Lochinvar 000 through 2, 1 Combustion AIR Blower, Combustion Air Blower and Transition Chamber