Lochinvar 497 - 2067 service manual High water temperature limit control, Optional relief valve

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Installation & Service Manual

7 Domestic water heaters

High water temperature limit control

The unit is equipped with an adjustable setting, auto-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. A manual reset high water temperature limit control is available as an optional control.

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!

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 What to do if YOU Smell GAS Save this manual for future referenceContents Warranty Please read before proceedingSpecial instructions Checking equipmentSafety information Owner warningPrevention of freezing CodesCopper-fin How it works Copper-fin How it works Models 987 2067 Front View Models 987 2067 Rear View Ratings Copper-fin =B=R RatingCopper-fin Specifications Installation Determine unit locationLocating the unit Indoor clearances from combustible constructionOutdoor boiler installation Shut-down and drainingFreeze protection Pump operationFreeze Protection for a Heating Boiler System if required Combustion and Ventilation AirMinimum Recommended Combustion AIR Supply to Equipment Room Number3Combustion air filter Models 497 Combustion air filterOutside Combustion Air, No Ducts Outside Combustion Air, Using DuctsCombustion Air Options Exhaust Fans Combustion Air from an Interior SpaceVenting General informationVenting support Vertical vent termination clearances and locationFlue Pipe Sizes Model Flue Size Vent system optionsBarometric damper location Conventional negative draft venting Negative draftFlue outlet piping Common venting systemsMasonry chimney installation Inspection of a masonry chimneyOutdoor installation venting Outdoor vent/air inlet locationOutdoor vent kit Outdoor Vent Kits Model Pump Cover Without Pump CoverConnecting to gas supply Gas piping Gas connectionsGas pressure test Inlet GAS Pressure Natural ModelSuggested GAS Pipe Size for Single Unit Installations Gas connectionGas train and controls Fittings to Equivalent Straight PipeGAS Piping Size Chart Combination gas valvesVenting of combination gas valves Checking gas supply pressureGas manifold pressure adjustment 3Measuring gas supply pressure at combination gas valve4Measuring manifold gas pressure Nat. GasWater connections Boiler circulator requirements Pressure Drop ChartWater connections heating boilers only Run Cycle Output Minimum System Load Temp. Rise 8.33 60 Min Minimum boiler water temperaturesLow system water volume Low temperature return water systems System Temperature Rise ChartRadiant floor and snow melt heating systems LTV Valve Kits Model LTV Valve KITCommon Manifold Size Min Models 497 Number of Units GPMDiameter Common Manifold Size Min Models 987 Number of Units6Primary/secondary piping of multiple boilers 7Boiler with low temperature bypass 8Primary/secondary piping with buffer tank Installation with a chilled water system Typical heating boiler installationsBoiler flow rate General plumbing rulesTemperature / pressure gauge Boiler bypass requirementsFilling the system Water treatmentConnecting to electrical supply Electrical connectionsAMP Draw Data VACBurners Terminal strip connection optionsTemperature adjustment Locating the temperature controlTemperature control settings OJ1 OJ2Outdoor reset option Temperature control sensors Remote sensor for pump delayPlacement of sensors Boiler applicationRemote Wire Connection Wire Gauge Max. Allowable Length Hot surface ignition systemRemote mounting of a sensor Hot surface igniter and ignition control moduleDiagnostic Status Indication Ignition and control timingsOperation and diagnostic lights Sequence Constant IgnitionStage 2 on SixStartup OFFFreeze protection when used Check/control water chemistryFill and test water system Purge air from water systemCheck for gas leaks Check thermostat circuitsCheck vent and air piping Start the boilerDomestic water heaters Water velocity controlInitial set-up of maximum water flow Maximum Water Flow1Typical water heater piping with storage tank 2Single water heater piping with two storage tanks Common Manifold Size Min Models 497 Number of Units4Multiple water heater piping with multiple storage tanks Required temperature rise Pipe Sizing Chart 497 987Pipe size requirements Water chemistryPotable hot water temperature control settings Domestic water temperatureMinimum pump performance Heat exchangerLocation of cold water supply piping connections High water temperature limit control Optional relief valveThermal expansion Cathodic protectionMaintenance Combustion and ventilation air Adjustment procedure Models 497 Sequence of operation Servicing a hot surface igniter and ignition moduleIgnition system checkout OverviewHeat transfer process End of sequenceGlossary Pump Delay Electronic Thermostat Function Trial for Ignition Ignition Module FunctionIgniter Controlled by Ignition Module Hi-Lo Fire RelayDiagrams Ladder diagramDiagrams Connection diagram Connection diagram

497 - 2067 specifications

Lochinvar 497 - 2067 is a highly efficient and versatile condensing boiler that is designed to meet the diverse heating needs of residential and commercial applications. Known for its impressive performance and advanced technology, the Lochinvar 497 - 2067 has garnered a reputation as a reliable choice among heating professionals.

One of the standout features of the Lochinvar 497 - 2067 is its impressive thermal efficiency. The boiler boasts an efficiency rating of up to 95% AFUE (Annual Fuel Utilization Efficiency), allowing users to significantly reduce their energy costs while minimizing environmental impact. This efficiency is facilitated by its innovative condensing technology, which captures and reuses heat from exhaust gases for optimal performance.

The Lochinvar 497 - 2067 is equipped with a robust stainless steel heat exchanger designed to handle high temperatures and ensure long-lasting performance. The heat exchanger’s design maximizes heat transfer, while its corrosion-resistant properties guarantee durability over time. This contributes to the boiler's overall longevity and serviceability, reducing the need for frequent replacements.

Control is another critical feature of the Lochinvar 497 - 2067. The boiler comes with an advanced control system that enables easy management of system operations. Users can take advantage of features such as outdoor reset control, which adjusts the temperature of the boiler based on external weather conditions, enhancing system efficiency and comfort.

In terms of safety, the Lochinvar 497 - 2067 incorporates several cutting-edge safety features, including a flame detection system and multiple safety shut-off devices. These safeguards help to ensure the safe operation of the boiler, providing peace of mind to users and heating professionals alike.

Another important characteristic is the compact design of the Lochinvar 497 - 2067, which allows for flexible installation in various settings, including tight spaces. Its lightweight structure further simplifies the installation process, making it a practical choice for contractors.

In summary, the Lochinvar 497 - 2067 is an exceptional high-efficiency condensing boiler that combines advanced technology, durability, and ease of use. With its impressive thermal efficiency, superior heat exchanger design, advanced control systems, and enhanced safety measures, it stands out as a top choice for those seeking reliable heating solutions. This boiler not only meets but exceeds modern demands for energy efficiency and performance, solidifying its position in the market.
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