Lochinvar 999 - 750, CF-CH(E)-i&s-08, 399 Combination Gas Valves, Checking Gas Supply Pressure

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Hydronic Heating Boilers and Domestic Water Heaters

INSTALLATION Continued

Water heater models do not have downstream test valves, but the rest of the gas train is represented by Figure 29.

Combination Gas Valves

These units fire in multiple stages of burner input. Each stage of burner operation has a combination gas valve(s) to cycle the gas supply on and off and regulate gas to the burners. Each combination valve consists of a gas regulator and two valve seats to meet the requirements for redundant gas valves. The valve has a gas control knob that must remain in the open position at all times when the unit is in service. The gas control valve has pressure taps located on the inlet and discharge sides of the valve. Manifold pressure is adjusted using the regulator located on the valve. A manifold gas pressure tap for each burner stick is located on the discharge side of the valve.

The manifold pressure is preset at the factory and adjustment is not usually required. If you must adjust regulator pressure, follow the instructions under Gas Manifold Pressure Adjustment, page 31.

Venting of Combination Gas Valves

The combination gas valve/regulator used on all units is equipped with an integral vent limiting orifice per ANSI Z21.78. The vent limiter ensures that the volume of gas emitted from the valve in the event of a failed gas diaphragm does not exceed the maximum safe leakage rate allowed by agency requirements. Combination gas valve/regulators equipped with integral vent limiters are not required to have vent or relief lines piped to the outdoors. The termination of the vent limited opening on the combination gas valve/regulator complies with the safety code requirements of CSD-1, CF-190(a) as shipped from the appliance manufacturer without the installation of additional vent lines.

Checking Gas Supply Pressure

Use the following procedure to check gas supply pressure.

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

2.Turn gas valve knobs to the “OFF” position.

3.Shut off gas supply at the field-installed manual gas cock in the gas piping to the unit. If fuel supply is L.P. gas, shut off gas supply at the tank.

4.Remove the 1/8" hex plug, located on the “inlet” side of the gas valve. You may also use a tapping on the field-

installed main manual gas cock or gas piping. Install a fitting in the inlet pressure tapping suitable to connect to a manometer or magnehelic gauge. Range of scale should be 14" w.c. or greater to check inlet pressure.

5.Turn on gas supply at the manual gas cock, turn on L.P. gas at the tank if required.

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

7.Turn the gas valve knobs to the “ON” position. Set the electronic temperature control or thermostat to call for heat.

8.Observe the gas supply pressure as all burners are firing. Ensure that inlet pressure is within the specified range. See Connecting To Gas Supply, page 28 for minimum and maximum gas supply pressures.

9.If gas pressure is out of range, contact 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, turn the power switch to the “OFF” position.

11.Turn gas valve knobs to the “OFF” position.

12.Shut off gas supply at the manual gas cock in the gas piping to the unit. If fuel supply is L.P. gas, shut off gas supply at the tank.

13.Remove the manometer and related fitting from the “inlet” side of the gas valve, replace 1/8" hex plug in gas valve and tighten.

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

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

16.Turn the gas valve knob to the “ON” position.

17.Set the electronic temperature control or thermostat to call for heat.

WARNING: After completing any testing on the gas system, leak test all gas connections. Apply a soap/water solution to all gas connections while main burners are operating. Bubbles forming indicate a leak. Repair all leaks at once. Do not operate this unit with a leak in the gas train, valves or related piping.

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Contents Domestic Water Heaters Hydronic Heating Boilers and Domestic Water Heaters General Product Information UnpackingSafety Information Installation Installation Clearances from Combustible ConstructionFreeze Protection Outdoor Boiler InstallationLocation Pump OperationCombustion and Ventilation AIR Shut-Down and DrainingFreeze Protection for a Heating Boiler System if required Combustion Air FilterCombustion Air Options Outside Combustion Air, No DuctsCombustion Air from Interior Space General Information VentingExhaust Fans Vertical Vent Termination Clearances and LocationSidewall Vent Termination Clearances and Location ChimneyCombustion Air Inlet Piping Length of Air Inlet PipeSidewall Air Inlet Vertical Rooftop Air Inlet ClearancesVent System Options Combined Air Inlet PointsBarometric Damper Location Conventional Negative Draft Venting Negative DraftFlue Outlet Piping Vertical DirectAire Venting Vertical Vent Termination Clearances and LocationInstallation Vent Kits Venting of Flue ProductsSidewall Venting Termination Sidewall VentingSidewall Fan Sidewall Venting Without FanVenting Guidelines Masonry Chimney Installation Horizontal DirectAire VentingVent Kits Direct VentingVertical DV Venting Termination Flue Pipe Materials Connecting the Air Inlet Pipe to the UnitHorizontal DV Venting Termination Combustion Air Inlet PipingAir Inlet Piping Materials Sealing PVC, CPVC, ABS, Dryer Vent, and Flex Duct Vent PipeOutdoor Installation Venting MaximumOutdoor Vent/Air Inlet Location Outdoor Vent Cap KitGas Piping Connecting to GAS SupplyConnecting Gas Piping to Unit Gas Pressure TestBtu/hr Distance From Meter in feet Gas Train and ControlsTABLE-J Input 51-100 101-200 201-300 301-500Combination 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 Pump Installation and Maintenance Heat Exchanger Pressure Drop ChartCirculator Pump Specifications Primary/Secondary Boiler PipingLow Temperature Return Water Systems Table O LTV Valve KitsInput LTV Valve Kit Btu/hr Radiant Floor and Snow Melt Heating Systems 10ºF 20ºF 30ºF 40ºFPlacing the Boiler in Operation Temperature/Pressure GaugeBoiler Flow Rate Boiler Bypass RequirementsInstallation with a Chilled Water System Boiler Operating Temperature ControlWater Treatment Terminal Strip Connection OptionsFor Your Safety Read Before Operating Remote ON/OFF Boiler or Water HeaterOperation To Turn Off Gas To Appliance Power UpQuick Programming Overview Standard Btu/hr ModelsTABLE-Q Adjust Menu Setting DescriptionsAdjust Menu Settings for Operating Modes TABLE-RIgnition Systems and Stages Operating ModesProgramming Buttons Access Levels Temperature ControlPlacement of Sensors Graphic Symbols Programming For Mode 1, Boiler OperationStaging Logic Remote Mounting of Sensors Programming For Mode 2, Water Heating OperationProgramming For Mode 3, Sequenced Operation TABLE-SHot Surface Igniter and Ignition Control Module Error and Warning MessagesHOT Surface Ignition System Hot Surface Ignition Control ModuleIgnition Control Diagnostic Codes Diagnostic Status IndicationAccess to Internal Control Panel Removing the Control PanelIgnition and Control Timings Operation and Diagnostic LightsStatus LED Diagnostic Codes Hot Surface Ignition Module Timings NominalWater Velocity Control Required Temperature RiseTemperature Rise Chart Water ChemistryTABLE-X Pipe Size RequirementsCirculating Pump 399,999 750,000 Btu/hr ModelsHeat Exchanger Potable Hot Water Temperature Control SettingsMinimum Pump Performance TABLE-YThermal Expansion High Water Temperature Limit ControlOptional Relief Valve Location of Cold Water Supply Piping ConnectionsAppliance Area Flue Gas Passageways Cleaning ProceduresBurner Removal and Cleaning Water Circulating PumpHeat Exchanger Cleaning ElectricalCombustion and Ventilation Air Adjusting Differential Air Pressure Set Up ProcedureAdjustment Procedure Servicing Hot Surface Igniter and Ignition Module Ignition System CheckoutSequence 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.

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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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