Lochinvar 399, 999 - 750 Primary/Secondary Boiler Piping, Heat Exchanger Pressure Drop Chart

Page 35

Installation and Service Manual

Example: The boiler inlet temperature is 160°F (71°C) and the boiler outlet temperature is 180°F (82°C), this means that there is a 20°F (11°C) temperature rise across the boiler.

Heat Exchanger Pressure Drop Chart

FIG. 34 Pressure Drop Chart 399,999 - 750,000

Pressure Drop Chart

990,000 - 2,070,000 Btu/hr Models

PRESSURE DROP IN FEET HEAD

FLOW IN GALLONS PER MINUTE

FIG. 35 Pressure Drop Chart 990,000 - 2,070,000

Circulator Pump Specifications

1.Maximum operating pressure for pump must exceed system operating pressure.

2.Maximum water temperature should not exceed nameplate rating.

3.Cast iron circulators may be used for closed loop systems.

4.A properly sized expansion tank must be installed near the boiler and on the suction side of the pump.

Circulator Pump Operation

(Heating Boilers Only)

The boiler pump should run continuously unless the boiler is provided with the pump delay control system. External wire leads are furnished with this option to allow the power supply for the pump to be switched across the normally open contacts of the relay, allowing the control relay to cycle the pump on each call for heat. The field installed boiler pump using the

factory supplied pump control system must not exceed 10 AMPS at 120VAC. As shipped from the factory, the control system is set to cycle the boiler pump on at each call for heat before the burners fire and run the pump for a 30 second period after the thermostat is satisfied. This will remove any residual heat from the combustion chamber before turning the pump off. See Wiring Diagram, page 64.

Pump Installation and Maintenance

For installation and maintenance information on the circulator pump, refer to pump manufacturers instructions included in the instruction package.

Primary/Secondary Boiler Piping

Boiler installations with a primary/secondary piping system as shown in FIG. 36 are recommended. This type of system uses a dedicated pump to supply flow to the boiler only. This secondary pump is sized based on desired boiler flow rate, boiler head loss and head loss in the secondary system piping only. A properly-sized primary (system) pump provides adequate flow to carry the heated boiler water to radiation, air over coils, etc. The points of connection to the primary (system) loop should be a maximum of 12" (or 4 pipe diameters) apart to ensure connection at a point of zero pressure drop in the primary system. Multiple boilers may also be installed with a primary/secondary manifold system as shown in FIG. 37. The multiple boilers are connected to the manifold in reverse return to assist in balancing flow to multiple boilers.

CAUTION: DO NOT allow the flow in the primary (system) loop to drop lower than the flow in the secondary loop at any time during boiler operation. Improper operation of the boiler(s) and possible tripping of the high limits and relief valves may occur.

The installer must ensure that the boiler has adequate flow without excessive temperature rise. Low system flow can result in overheating of the boiler water which can cause short burner on cycles, system noise and in extreme cases, a knocking flash to steam. These conditions indicate the need to increase boiler flow by installation of a larger circulator pump or the installation of a system bypass. System noise may also indicate an oversized boiler.

CAUTION: At no time should the system

pressure be less than 12 PSIG.

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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 LocationSidewall Air Inlet Combustion Air Inlet PipingLength of Air Inlet Pipe Clearances Vertical Rooftop Air InletBarometric Damper Location Vent System OptionsCombined Air Inlet Points Flue Outlet Piping Conventional Negative Draft VentingNegative Draft 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 feetVenting of Combination Gas Valves Combination Gas ValvesChecking Gas Supply Pressure Table L Gas Manifold Pressure AdjustmentMultiple Unit Installations Gas Supply Pipe Sizing Connecting to Water Supply Low Water Cutoff Water Flow SwitchRelief Valve Circulator Pump Requirements General Plumbing RulesWater Connections Heating Boilers Only Primary/Secondary Boiler Piping Heat Exchanger Pressure Drop ChartCirculator Pump Specifications Pump Installation and MaintenanceInput LTV Valve Kit Btu/hr Low Temperature Return Water SystemsTable O LTV Valve Kits 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-QProgramming Buttons Ignition Systems and StagesOperating Modes Placement of Sensors Access LevelsTemperature Control Staging Logic Graphic SymbolsProgramming For Mode 1, Boiler Operation 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 AreaCombustion and Ventilation Air Heat Exchanger CleaningElectrical Adjustment Procedure Adjusting Differential Air PressureSet Up 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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