Lochinvar 497 - 2067 Gas connections, Connecting to gas supply Gas piping, Gas pressure test

Page 22

Installation & Service Manual

3 Gas connections

Connecting to gas supply

Gas piping

Verify that the appliance is supplied with the type of gas specified on the rating plate. This appliance is configured for operation up to 2000 feet altitude. Consult factory for installations above 2000 feet elevation.

Inlet gas pressure: Measured at the inlet pressure tap on the appliance gas manifold. The pressure tap is located upstream of the combination gas valve(s).

See Table 3A for maximum and minimum inlet pressures. Do not exceed the maximum. Minimum inlet pressure is for the purpose of input adjustment.

TABLE 3A

INLET GAS PRESSURE

 

NATURAL

 

LP

MODEL

 

 

 

 

 

Max.

Min.

Max.

 

Min.

 

w.c.

w.c.

w.c.

 

w.c.

 

 

 

 

 

 

497 - 747

14''

4.0''

14.0''

 

8.0''

 

 

 

 

 

 

987 - 2067

14''

4.5''

14.0''

 

8.0''

 

 

 

 

 

 

Manifold pressure: The gas regulator on the unit’s combination gas valve is adjustable to supply proper manifold pressure for normal operation.

NOTICE

If an inline high gas pressure regulator is

used, it MUST BE of the lockup type and

 

be located a minimum of 10 feet from the

To safely operate this unit, you must properly size the gas supply piping. See Tables 3B through 3D for piping and fitting requirements. Gas pipe size may be larger than heater connection.

The gas connection for Models 497 - 747 is 1 1/4'' NPT and on Models 987 - 2067 the gas connection to these units is 2'' NPT.

For ease of service, install a union.

Install a manual main gas shutoff valve, outside of the unit gas connection within six feet of the unit in accordance with the requirements of the National Fuel Gas Code, ANSI Z223.1.

You must provide a sediment trap (drip leg) in the inlet of the gas connection to the unit.

NOTICE

It is the installer’s responsibility to supply

the sediment trap (drip leg).

The combination gas valves have an integral vent limiting device and do not require venting to atmosphere, outside the building. The unit will not operate properly if the reference hose is removed or a vent to atmosphere is installed.

Optional gas controls may require routing of bleeds and vents to the atmosphere, outside the building when required by local codes.

Figure 3-1_Gas line connection

appliance.

Failure to do so may result in

insufficient gas volume supplied to the

appliance.

 

If you must adjust regulator pressure, follow the instructions under Gas Manifold Pressure Adjustment on page 25. Do not increase regulator pressure beyond specified pressure setting.

Gas pressure test

COUPLING

UNION

MANUAL MAIN

SHUT OFF

VALVE

USE WRENCH

TO HOLD

SUPPLY PIPE

8"

MIN

1.The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5 kPa).

2.The appliance must be isolated from the gas supply piping system by closing a manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG (3.5 kPa).

3.The appliance and its gas connection must be leak tested before placing it in operation.

NIPPLE

CAP

22

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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 filterCombustion Air Options Outside Combustion Air, Using DuctsOutside Combustion Air, No Ducts Exhaust Fans Combustion Air from an Interior SpaceVenting support VentingGeneral information Vertical vent termination clearances and locationBarometric damper location Vent system optionsFlue Pipe Sizes Model Flue Size 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 Water connections heating boilers only Pressure Drop ChartBoiler circulator requirements Low system water volume Minimum boiler water temperaturesRun Cycle Output Minimum System Load Temp. Rise 8.33 60 Min 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.

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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