Lochinvar 999 - 750 Vent System Options, Combined Air Inlet Points, Barometric Damper Location

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Installation and Service Manual

If the air inlet cap is within a 10-foot (3.05m) radius of the flue outlet, the point of termination for the combustion air inlet cap must be at least 3 feet (0.91m) below the point of flue gas termination (vent cap).

Do not install the combustion air inlet cap closer than 10 feet (3.05m) from an inside corner of an L-shaped structure.

Combined Air Inlet Points

The air inlet pipes from multiple boilers can be combined to a single common connection if the common air inlet pipe has a cross sectional area equal to or larger than the total area of all air inlet pipes connected to the common air inlet pipe.

Example: Two 10" air inlet pipes (78.5 in2 area each) have a total area of 157 in2 and will require a 15" (176.7 in2 area) common air inlet pipe.

The air inlet point for multiple boiler air inlets must be provided with an exterior opening which has a free area equal to or greater than the total area of all air inlet pipes connected to the common air inlet. This exterior opening for combustion air must connect directly to the outdoors. The total length of the combined air inlet pipe must not exceed a maximum of 50 (15.2m) equivalent feet. Subtract 5 feet (1.5m) for each 90° elbow in the air inlet pipe. You must deduct the restriction in area provided by any screens, grills or louvers installed in the common air inlet point. These are common on the sidewall air inlet openings. Screens, grills or louvers installed in the common air inlet can reduce the free area of the opening from 25% to 75% based on the materials used.

Vent System Options

This unit has six venting options.

1. Conventional Negative Draft Venting

This option uses a vertical rooftop flue termination. Combustion air is supplied from the mechanical room. See column 2 for detailed information.

2. Vertical DirectAire™ Venting

This option uses a vertical conventional vent for flue products. Combustion air is supplied by a pipe from the sidewall or rooftop. See page 17 for venting details.

3. Sidewall Venting

This option uses a powered vent assembly to exhaust the flue products out a sidewall vent termination. Combustion air is supplied from the mechanical room. See page 19 for venting details.

4. Horizontal DirectAire™ Venting

This option uses a powered vent assembly to exhaust the flue products out a sidewall. Combustion air is supplied by a pipe from the sidewall. See page 21 for venting details.

5. Direct Venting

This option uses a sealed AL29-4C flue and a separate combustion air pipe to the outdoors. This system terminates both the flue and combustion air inlet in the same pressure zone. The flue outlet and combustion air intake may terminate at either a sidewall (horizontal) or the rooftop (vertical). See page 22 for venting details.

6. Outdoor Installation Venting

This option uses the installation of a special air inlet/vent cap on top of the unit. See page 26 for venting details.

All units are shipped from the factory equipped for conventional negative draft venting. All other optional vent systems require the installation of specific vent kits and venting materials. The following is a detailed explanation of the installation requirements for each venting system, components used and part numbers of vent kits for each model.

Barometric Damper Location

Any venting system option that requires a barometric damper must adhere to the following directions for optimum performance.

The preferred location for the barometric damper is in a tee or collar installed in the vertical pipe rising from the unit’s flue outlet. The barometric damper MUST NOT be installed in a bull head tee installed on the unit’s flue outlet. The tee or collar containing the barometric damper should be approximately three feet vertically above the connection to the unit’s flue outlet. This location ensures that any positive velocity pressure from the unit’s internal combustion fan is dissipated and the flue products are rising due to buoyancy generated from the temperature of the flue products. Adjust the weights on the damper to ensure that draft is maintained within the specified range.

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Contents Domestic Water Heaters Hydronic Heating Boilers and Domestic Water Heaters Unpacking General Product InformationSafety Information Installation Clearances from Combustible Construction InstallationPump Operation Outdoor Boiler InstallationLocation Freeze ProtectionCombustion Air Filter Shut-Down and DrainingFreeze Protection for a Heating Boiler System if required Combustion and Ventilation AIROutside Combustion Air, No Ducts Combustion Air OptionsCombustion Air from Interior Space Vertical Vent Termination Clearances and Location VentingExhaust Fans General InformationChimney Sidewall Vent Termination Clearances and LocationCombustion Air Inlet Piping Length of Air Inlet PipeSidewall Air Inlet Clearances Vertical Rooftop Air InletVent System Options Combined Air Inlet PointsBarometric Damper Location Conventional Negative Draft Venting Negative DraftFlue Outlet Piping Vertical Vent Termination Clearances and Location Vertical DirectAire VentingVenting of Flue Products Installation Vent KitsSidewall Venting Without Fan Sidewall VentingSidewall Fan Sidewall Venting TerminationVenting Guidelines Horizontal DirectAire Venting Masonry Chimney InstallationDirect Venting Vent KitsVertical DV Venting Termination Combustion Air Inlet Piping Connecting the Air Inlet Pipe to the UnitHorizontal DV Venting Termination Flue Pipe MaterialsSealing PVC, CPVC, ABS, Dryer Vent, and Flex Duct Vent Pipe Air Inlet Piping MaterialsMaximum Outdoor Installation VentingOutdoor Vent Cap Kit Outdoor Vent/Air Inlet LocationGas Pressure Test Connecting to GAS SupplyConnecting Gas Piping to Unit Gas PipingInput 51-100 101-200 201-300 301-500 Gas Train and ControlsTABLE-J Btu/hr Distance From Meter in feetCombination Gas Valves Checking Gas Supply PressureVenting of Combination Gas Valves Gas Manifold Pressure Adjustment Multiple Unit Installations Gas Supply Pipe SizingTable L Connecting to Water Supply Water Flow Switch Relief ValveLow Water Cutoff General Plumbing Rules Water Connections Heating Boilers OnlyCirculator Pump Requirements Primary/Secondary Boiler Piping Heat Exchanger Pressure Drop ChartCirculator Pump Specifications Pump Installation and MaintenanceLow Temperature Return Water Systems Table O LTV Valve KitsInput LTV Valve Kit Btu/hr 10ºF 20ºF 30ºF 40ºF Radiant Floor and Snow Melt Heating SystemsBoiler Bypass Requirements Temperature/Pressure GaugeBoiler Flow Rate Placing the Boiler in OperationBoiler Operating Temperature Control Installation with a Chilled Water SystemTerminal Strip Connection Options Water TreatmentRemote ON/OFF Boiler or Water Heater For Your Safety Read Before OperatingOperation Standard Btu/hr Models Power UpQuick Programming Overview To Turn Off Gas To ApplianceTABLE-R Adjust Menu Setting DescriptionsAdjust Menu Settings for Operating Modes TABLE-QIgnition Systems and Stages Operating ModesProgramming Buttons Access Levels Temperature ControlPlacement of Sensors Graphic Symbols Programming For Mode 1, Boiler OperationStaging Logic TABLE-S Programming For Mode 2, Water Heating OperationProgramming For Mode 3, Sequenced Operation Remote Mounting of SensorsHot Surface Ignition Control Module Error and Warning MessagesHOT Surface Ignition System Hot Surface Igniter and Ignition Control ModuleRemoving the Control Panel Diagnostic Status IndicationAccess to Internal Control Panel Ignition Control Diagnostic CodesHot Surface Ignition Module Timings Nominal Operation and Diagnostic LightsStatus LED Diagnostic Codes Ignition and Control TimingsWater Chemistry Required Temperature RiseTemperature Rise Chart Water Velocity Control399,999 750,000 Btu/hr Models Pipe Size RequirementsCirculating Pump TABLE-XTABLE-Y Potable Hot Water Temperature Control SettingsMinimum Pump Performance Heat ExchangerLocation of Cold Water Supply Piping Connections High Water Temperature Limit ControlOptional Relief Valve Thermal ExpansionWater Circulating Pump Flue Gas Passageways Cleaning ProceduresBurner Removal and Cleaning Appliance AreaHeat Exchanger Cleaning ElectricalCombustion and Ventilation Air Adjusting Differential Air Pressure Set Up ProcedureAdjustment Procedure Ignition System Checkout Servicing Hot Surface Igniter and Ignition ModuleSequence of Operation Ignition Troubleshooting Guide 990,000 2,070,000 Btu/hr Models Domestic Water Heaters Hydronic Heating Boilers Ladder Diagram 399,999 750,000 BTU/HR Models Hydronic Heating Boilers and Domestic Water Heaters Installation Ladder Diagram 990,000 2,070,000 BTU/HR Models Models Wiring Diagram Hydronic Heating Boilers and Domestic Water Heaters BTU/HR Models
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399, CF-CH(E)-i&s-08, 999 - 750 specifications

Lochinvar 999 - 750, CF-CH(E)-i&s-08,399 is a cutting-edge boiler designed for commercial heating applications. With its robust construction and high efficiency, this model stands out in the crowded market of heating solutions.

One of the main features of the Lochinvar 999 - 750 is its exceptional thermal efficiency rating. The unit incorporates advanced condensing technology that allows it to recover heat from flue gases, which helps in achieving efficiency levels of up to 99%. This efficiency not only reduces energy consumption but also lowers operational costs, making it an excellent investment for businesses looking to minimize their carbon footprint.

The boiler is designed to provide a powerful output of 750 kW, ensuring it meets the heating demands of larger buildings or commercial spaces. Its capacity makes it suitable for a range of applications including schools, hospitals, and industrial facilities. Moreover, the unit features a built-in cascading system that enables multiple boilers to be connected, enhancing system reliability and flexibility.

In terms of technology, the Lochinvar 999 - 750 is equipped with a user-friendly touchscreen interface. This innovative control system allows operators to monitor and adjust settings with ease, providing real-time performance data and alerts for maintenance needs. The intelligent controls optimize operation to match the heating load, further enhancing energy efficiency.

Safety is a top priority with this model. It is built with multiple safety features such as automatic shut-off valves, pressure relief valves, and flame monitoring systems, ensuring safe operation under various conditions. The unit also adheres to stringent industry standards and regulations, making it a reliable choice for commercial applications.

Furthermore, the Lochinvar 999 - 750 is designed with serviceability in mind. Its compact footprint and accessible components simplify maintenance, reducing downtime and associated costs. The unit also supports a variety of fuel sources, including natural gas, propane, and biodiesel, providing flexibility to meet different facility requirements.

In summary, the Lochinvar 999 - 750, CF-CH(E)-i&s-08,399 represents a blend of efficiency, reliability, and safety in commercial heating. Its advanced technologies and thoughtful design make it a powerful solution for various heating needs, making it an ideal choice for businesses aiming for excellence in energy management and operational efficiency.
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