Lochinvar 497 - 2067 service manual 4Measuring manifold gas pressure, Nat. Gas

Page 26

Installation & Service Manual

3 Gas connections

12.If adjustment is necessary, remove the regulator cover screw on the gas valve. Note: If the gas valve under adjustment is located on a manifold assembly monitored by an igniter, the unit may shut down and recycle when the regulator cover screw is removed. This is normal.

13.Turn the regulator adjustment screw “clockwise” to raise the regulator gas pressure. Turn the regulator adjustment screw “counterclockwise” to lower the regulator gas pressure.

14.Replace the regulator cover screw and make sure it is tight for proper operation.

15.Read the value on the manometer/magnahelic and compare it to the values in TABLE- 3E.

16.Repeat this adjustment procedure for each gas valve as necessary to adjust to the proper manifold gas pressure.

17.Remove hoses, replace and tighten plugs and caps when complete.

18.Replace top front upper jacket access panels and control panel door in reverse order.

19.If proper ignition and burner operation is not achieved after checking gas supply pressure, see Cleaning and Maintenance, page 58 for Combustion Air Fan Adjustment. Follow the procedure to adjust the combustion air fans as necessary.

Figure 3-4_Measuring manifold gas pressure

 

 

PRESSURE

 

 

 

 

 

 

REGULATOR

 

 

 

CHAMBER

 

 

ADJUSTMENT

 

 

 

MANIFOLD

 

 

 

 

PRESSURE

 

(UNDER CAP

 

 

 

PRESSURE

 

 

 

 

 

 

SCREW)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INLET

TEE

OUTLET

 

MANOMETER

 

GAS

 

 

 

TO BARBED

 

 

 

 

VALVE

 

FITTING

 

 

CONTROL

 

 

 

 

KNOB

 

 

TABLE 3E

Net Manifold Pressure

Regulator Pressure Less

Front Chamber Pressure

MODEL

Nat. Gas

LP

497 - 747

1.8'' w.c.

--

987 - 2067

1.2'' w.c.

--

497-2067

--

4.6'' w.c.

26

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Contents What to do if YOU Smell GAS Save this manual for future referenceContents Special instructions WarrantyPlease read before proceeding Checking equipmentPrevention of freezing Safety informationOwner warning 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 Locating the unit InstallationDetermine unit location Indoor clearances from combustible constructionFreeze protection Outdoor boiler installationShut-down and draining Pump operationMinimum Recommended Combustion AIR Supply to Equipment Room Freeze Protection for a Heating Boiler System if requiredCombustion and Ventilation Air 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 support VentingGeneral information Vertical vent termination clearances and locationFlue Pipe Sizes Model Flue Size Vent system optionsBarometric damper location Flue outlet piping Conventional negative draft ventingNegative draft 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 CoverGas pressure test Connecting to gas supply Gas pipingGas connections Inlet GAS Pressure Natural ModelGas train and controls Suggested GAS Pipe Size for Single Unit InstallationsGas connection Fittings to Equivalent Straight PipeVenting of combination gas valves GAS Piping Size ChartCombination 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 Radiant floor and snow melt heating systems Low temperature return water systemsSystem Temperature Rise Chart LTV Valve Kits Model LTV Valve KITDiameter Common Manifold Size Min Models 497 Number of UnitsGPM 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 Boiler flow rate Installation with a chilled water systemTypical heating boiler installations General plumbing rulesFilling the system Temperature / pressure gaugeBoiler bypass requirements Water treatmentAMP Draw Data Connecting to electrical supplyElectrical connections VACBurners Terminal strip connection optionsTemperature control settings Temperature adjustmentLocating the temperature control OJ1 OJ2Outdoor reset option Placement of sensors Temperature control sensorsRemote sensor for pump delay Boiler applicationRemote mounting of a sensor Remote Wire Connection Wire Gauge Max. Allowable LengthHot surface ignition system Hot surface igniter and ignition control moduleDiagnostic Status Indication Ignition and control timingsStage 2 on Operation and diagnostic lightsSequence Constant Ignition SixStartup OFFFill and test water system Freeze protection when usedCheck/control water chemistry Purge air from water systemCheck vent and air piping Check for gas leaksCheck thermostat circuits Start the boilerInitial set-up of maximum water flow Domestic water heatersWater velocity control 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 Pipe size requirements Required temperature risePipe Sizing Chart 497 987 Water chemistryMinimum pump performance Potable hot water temperature control settingsDomestic water temperature Heat exchangerLocation of cold water supply piping connections Thermal expansion High water temperature limit controlOptional relief valve Cathodic protectionMaintenance Combustion and ventilation air Adjustment procedure Models 497 Ignition system checkout Sequence of operationServicing a hot surface igniter and ignition module OverviewHeat transfer process End of sequenceGlossary Igniter Controlled by Ignition Module Pump Delay Electronic Thermostat FunctionTrial for Ignition Ignition Module Function 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.

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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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