Checking Manifold GAS Pressure | Lochinvar 1, 000 through 2 instruction

Lochinvar 1, 000 through 2 warranty Checking Manifold GAS Pressure

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1.Turn the main power switch to “OFF” position.

2.Shut off gas supply at the manual gas cock in the as piping to the appliance. If fuel supply is LP gas, shut off gas supply at the tank.

3.Remove the 1/8" hex plug from the gas pressure test port located on the inlet gas supply connection at the rear of the appliance. Install a fitting in the inlet pressure tapping suitable to connect to a manometer or magnahelic gauge. Range of scale should be 14 inch w.c. or greater to check inlet pressure.

4.Turn on gas supply at the field installed manual gas cock, turn on LP gas at tank if required.

5.Turn the power switch to “ON” position and ensure that the Run/Stop switch is in the “Run” position.

6.Adjust the temperature setpoint on the Command Display to call for heat.

7.Observe the gas supply pressure as the burner fires at 100% of rated input. Percent of burner input will be displayed on the Command Display.

8.Ensure inlet pressure is within specified range. Minimum and Maximum gas supply pressures are specified in Gas Supply section of this manual.

9.If gas pressure is out of range, contact the gas utility, gas supplier, qualified installer or service agency to determine necessary steps to provide proper gas pressure to the control.

10.If gas supply pressure is within normal range, proceed to remove gas manometer and replace pressure tap fittings in the gas piping to the appliance.

11.Turn the power switch to “OFF” position.

12.Shut off gas supply at the manual gas cock in the gas piping to the appliance. If fuel supply is LP gas, shut off gas supply at the tank.

13.Remove the manometer and related fittings from gas pressure test port at the inlet gas supply connection to the appliance. Replace 1/8" hex plug in gas pressure test port and tighten.

14.Turn on gas supply at the manual valve, turn on LP gas at tank if required.

15.Turn the power switch to “ON” position.

16.Adjust the temperature setpoint on the Command Display to the desired water temperature so the appliance will call for heat.

17.Check burner performance by cycling the system while you observe burner response. The burner should ignite promptly. Flame pattern should be stable, see “Maintenance-Normal Flame Pattern.” Turn system off and allow burner to cool, then cycle burner again to ensure proper ignition and flame characteristics.

IMPORTANT

Upon completion of any testing on the gas system, leak test all gas connections with a soap solution while the main burner is firing. Immediately repair any leak found in the gas train or related components. DO NOT operate an appliance with a leak in the gas train, valves or related gas piping.

CHECKING MANIFOLD

GAS PRESSURE

There is a pressure test tree located in the top chamber of the appliance. This pressure test point can be accessed by swinging out the front control panel. The pressure test tree is mounted on the front edge of the combustion air blower. It consists of an angle support and four test cocks. There is one cock for positive air and one for negative air, one cock for positive gas and one for negative gas. Manifold pressure measurement will utilize both the positive and negative test points for gas.

1.Open the front controls panel and swing the controls out. Locate the pressure test tree on the front edge of the combustion air blower. The positive and negative gas pressure terminals will be used to check differential gas pressure from the gas manifold and the air box. Each gas pressure connection point will have a small manual cock to attach a hose.

2.Connect a hose from the positive gas and the negative gas to each of the two sides of a manometer. This will allow the two pressure points to be measured at the same time. Open the two gas pressure test point cocks.

3.Set the Command Display to a set point which will fire the burner at 100% of rated input.

4.As the appliance comes on and fires, record the inches of water column of displacement on both sides of the manometer. The sum of these two readings as they are effected by the two gas pressures is the differential manifold pressure.

5.The differential manifold gas pressure should be 3.5 inches of water column (+ 0.1" w.c.) when the burner is firing at 100% of rated input.

6.If the differential manifold pressure is not 3.5 inches water column (+ 0.1" w.c.), recheck the gas

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Contents

IFB/IFW-i&s-05 WarrantySpecial Instructions To Owner Table of Contents What to do if YOU Smell GAS Checking EquipmentDo not Owner WarningTable a Installation Procedure Location of UnitRecommended Service Clearances Clearances from Combustible ConstructionCombustion Air Direct from Outside AIR Supply to Mechanical Room Table BMinimum Recommended Combustion 500 in2 3226 cm2 667 in2 4303 cm2 000 in2 12,903 cm2Construction AIR Filter Construction Air FilterTable D Construction AIR Filter Kits Table CVenting Category IV Flue Pipe SizesCategory IV Flue Pipe Materials Category IV Positive Pressure Venting SystemCategory IV Venting Venting Guidelines for a Category IV VentExceed a maximum of 100 equivalent feet 30.5 m in length Drain Tee InstallationGeneral Category IV Vent Termination Clearances Masonry Chimney Installations Vertical Venting TerminationsSidewall Vent Cap Kits Sidewall Venting TerminationsTable E Sidewall VentLocation of a Sidewall Vent Termination Direct Vent INTELLI-VENT SystemsAir Inlet Table FDirect Vent and Intelli-Vent Flue Air Inlet Pipe Sizes Length of Air Inlet PipeVertical Direct Vent Systems Combined Combustion Air Inlet PointsMultiple Vertical Direct Vent Installations Horizontal Direct VentLocation of a Sidewall Air Inlet Cap Sidewall Combustion AIR InletTable G Multiple Horizontal Direct Vent Installations These areMaximum Length of an Intelli-Vent System Table HCombined Air Inlet Points Air Inlet Sidewall Input Flue Pipe Btu/hr SizeBtu/hr Size Cap Kit Horizontal INTELLI-VENT with Vertical Combustion AIRAir Inlet Sidewall Input Flue Pipe 500,000 SVK3026Vertical Combustion Horizontal INTELLI-VENT AIR Inlet Location of a Rooftop Air Inlet CapTable J GAS Connection GAS Supply GAS Pressure TestTable K Table LTable M Recommended Gas Pipe Size Single Appliance InstallationsMultiple Appliance Installations Gas Pipe Size Chart Table NGAS Piping GAS Manifold Pressure AdjustmentInstall Piping to Control Checking GAS Supply PressureChecking Manifold GAS Pressure Water Connections Water ConnectionsMinimum Pipe Size Requirements Secondary Heat Exchanger Primary Heat ExchangerInlet and Outlet Connections Integral Bypass Bypass Valve SynchronizationOptional Intermittent Pump Operation Bypass Piping AssemblyIntegral Circulator Bypass Initial Set-up of Maximum Water FlowTable P Minimum Water TemperaturesBtu/hr Input Temperature Rise Bypass OperationLOW Water Cutoff Water Flow SwitchTable Q 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 LocationsExcel High GAS Pressure Switch LOW GAS Pressure Switch OptionalLOW AIR Pressure Switch Be used as a diagnostic indicator Table S Temperature AdjustmentDefault Values Pre-programmed in the Excel To Activate the Manual OverrideTable T Display Default Values Password FunctionConfiguring Command Display Accessing the SIX Changeable Points from Command DisplaySet Point Temp Calculated Set PointTotal Run Time Sequencing TypeCommand Display Data Screen Status Point Operational Modes Status PointsTable U Hot Surface Igniter OnOutdoor Reset Function Selections Optional on Heating Boilers OnlyMultiple Appliance Installations Efficiency Optimized with Time EqualizationTable W Singly Terminated FTT Network Bus Topology SpecificationsInterfacing Multiple Appliances Wire Termination for E-Bus Connection Additional Components Used to Interface Multiple AppliancesHigh Water Temperature Limit Control Typical Building Management System DiagramIgnition Module Lockout Functions Service PartsHOT Surface Ignition System Ignition and Control Timings Diagnostic Status IndicationTable Y Table ZBurner OPERATION/DIAGNOSTIC LIGHTS, Resets and SwitchesIndicator Table AACombustion AIR Blower Combustion Air Blower and Transition ChamberTable BB Condensate ManagementSystem Optional Condensate Drain Location On RearReplenishing the Neutralizer Condensate TestingCondensate Trap Installation 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 Water Treatment Heating Boiler InstallationsFreeze Protection for a Heating Boiler System If Required Water Connections Heating Boilers onlyBoiler Circulator Pump Limitations Primary Loop Circulator Pump SpecificationsPiping Lengths Circulator Pump OperationMinimum Boiler Water Temperatures PRIMARY/SECONDARY Boiler PipingMaximum Flow for Heating Boiler Boiler Temperature Rise Chart Table DDTable CC Btu/hr Input Maximum FlowPlacing the Boiler Operation TEMPERATURE/PRESSURE GaugeTypical Heating Boiler Installations Boiler Operation Installation with a Chilled Water SystemBoiler Operating Temperature Control Water Velocity Control Typical Water Heater Piping with Storage TankMaximum Flow Rate Btu/hr Input Table EETable FF Water Chemistry Piping Multiple Unit Installations Single Water Heater Piping with Two Storage TanksHeat Exchanger Table GGPump Operation Common ManifoldThermostat Settings Table HHCathodic Protection Optional Relief ValveThermal Expansion Ladder Diagram PWM Wiring Diagram

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