Lochinvar CF-CH(E)-i&s-08, 999 - 750 High Water Temperature Limit Control, Optional Relief Valve

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Installation and Service Manual

• Water temperature over 125°F (52°C) can cause severe burns instantly or death from scalds.

• Children, disabled and elderly are at highest risk of being scalded.

• See instruction manual before setting temperature at heating appliance.

• Feel water before bathing or showering.

• If this appliance is used to produce water that could scald if too hot, such as domestic hot water use, adjust the outlet control (limit) or use temperature limiting valves to obtain a maximum water temperature of 125°F (52°C).

WARNING: Return water temperatures must not be less than 140°F (60°C). If lower return water temperatures are required, follow the instructions for Low Temperature Return Water Systems, page 36.

4.The temperature set points for all stages should be set at the same temperature when supplying potable hot water for domestic use.

5.Stage firing is achieved by setting the differentials at approximately 3°F, 5°F, 7°F and 9°F for stages 1, 2, 3, and 4. Stage firing of a potable water heater should only be used to replace system standby heat loss.

6.All stages of burner operation should fire when there is a major draw from the potable hot water storage system. This prevents possible condensate problems and ensures a rapid recovery of the hot water used.

be tempered in the storage tank before entering the heater. See FIG. 54 and typical installation drawings provided with the unit for correct piping. Higher water temperatures reduce condensate formation.

High Water Temperature Limit Control

The unit is equipped with an adjustable setting, manual-reset high water temperature limit control. The hot water heater temperature limit control has a maximum limit setting of 200°F (93°C). If water temperature exceeds the set point, the limit will break the control circuit and shut down the unit. The limit control will only be reset after the water temperature has cooled below the set point of the limit. The high water temperature limit control is mounted in the outlet side of the front header.

Optional Relief Valve

This water heater is normally supplied with a temperature and pressure relief valve(s) sized in accordance with applicable codes. Units may be supplied with an optional pressure only relief valve(s). When a water heater equipped with this optional relief valve is piped to a separate storage vessel, the storage vessel must have a properly installed temperature and pressure relief valve which complies with local codes.

Thermal Expansion

A relief valve which discharges periodically may be due to thermal expansion in a closed system. A hot water supply boiler installed in a closed system, such as one with a backflow preventer or check valve installed in the cold water supply, shall be provided with means to control expansion. Contact the water supplier or local plumbing inspector on how to correct this situation. Do not plug or cap the relief valve discharge!

IMPORTANT: When water is stored at temperatures above 125°F (52°C), a thermostatic mixing valve must be installed on the hot water outlet from the storage tank to supply lower temperature water and prevent the risk of a scald injury.

Note: This water heater, when set at a lower temperature setting, is not capable of producing hot water of sufficient temperature for sanitizing purposes.

Location of Cold Water Supply Piping Connections

Incorrect piping of the cold water supply to the system may result in excessive low temperature operation causing condensate formation on the heat exchanger and operational problems. You must install the cold water supply piping in the discharge piping from the heater to the storage tank. This allows the cold water to

Cathodic Protection

Hydrogen gas, which is extremely flammable, can be produced in a hot water system that has been unused for a long period of time (generally two weeks or more). To prevent the possibility of injury under these conditions, open the kitchen sink hot water faucet for several minutes before using any electrical appliance connected to the hot water system. If hydrogen is present, there will be an unusual sound such as air escaping through the pipe as the hot water begins to flow. Do not smoke or have open flames near the faucet at this time.

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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 LocationLength of Air Inlet Pipe Combustion Air Inlet PipingSidewall Air Inlet Clearances Vertical Rooftop Air InletCombined Air Inlet Points Vent System OptionsBarometric Damper Location Negative Draft Conventional Negative Draft VentingFlue 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 feetChecking Gas Supply Pressure Combination Gas ValvesVenting of Combination Gas Valves Multiple Unit Installations Gas Supply Pipe Sizing Gas Manifold Pressure AdjustmentTable L Connecting to Water Supply Relief Valve Water Flow SwitchLow Water Cutoff Water Connections Heating Boilers Only General Plumbing RulesCirculator Pump Requirements Primary/Secondary Boiler Piping Heat Exchanger Pressure Drop ChartCirculator Pump Specifications Pump Installation and MaintenanceTable O LTV Valve Kits Low Temperature Return Water SystemsInput 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-QOperating Modes Ignition Systems and StagesProgramming Buttons Temperature Control Access LevelsPlacement of Sensors Programming For Mode 1, Boiler Operation Graphic SymbolsStaging 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 AreaElectrical Heat Exchanger CleaningCombustion and Ventilation Air Set Up Procedure Adjusting Differential Air PressureAdjustment 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.