Lochinvar 497 - 2067 Low temperature return water systems, LTV Valve Kits Model LTV Valve KIT

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4 Water connections

Low temperature return water systems

Any non-condensing boiler and venting system will develop operational problems when exposed to inlet water temperatures below 140°F. Lochinvar offers a low temperature protection valve (LTV) that is factory preset to maintain 140°F inlet water to the boiler regardless of the system return water temperature. See Table 4A for available valve kits.

TABLE 4A

LTV VALVE KITS

MODEL

LTV VALVE KIT

497 - 747

VAL3048

987 - 2067

VAL3047

Be sure to install the LTV valve per the piping diagrams included with the kits. Alternatively, a bypass as shown in FIG. 4-6 may be piped into the system. This piping is like a primary/secondary boiler installation with a bypass in the secondary boiler piping. Inlet water temperatures below 140°F (60°C) can excessively cool the products of combustion resulting in condensation on the heat exchanger and in the flue.

Condensation can cause operational problems, bad combustion, sooting, flue gas spillage and reduced service life of the vent system and related components. The bypass allows part of the boiler discharge water to be mixed with the cooler boiler return water to increase the boiler inlet temperature above 140°F (60°C). This should prevent the products of combustion from condensing in most installations. The bypass should be fully sized with a balancing valve to allow for proper adjustment. A valve must also be provided on the boiler discharge, after the bypass. Closing this discharge valve forces water through the bypass.

Installation & Service Manual

Start boiler adjustment with the bypass valve in the full open position and the boiler discharge valve half open. A small amount of the higher temperature boiler discharge water is mixed with the system water to maintain the desired lower system temperature. A remote low temperature range operator is recommended to control the boiler operation based on the lower system temperature. (See Terminal Strip Connection Options starting on page 38).

Radiant floor and snow melt heating systems

This type of heating boiler application operates in a low temperature range which requires a boiler bypass as described under the Low Temperature Bypass Requirements section. A non-metallic rubber or plastic tubing installed in a radiant (in floor) system must have an oxygen barrier to prevent oxygen from entering the system through the walls of the installed tubing. Excessive oxygen absorption into the system will result in an accelerated rate of corrosion causing a sludge buildup. This excessive corrosion will also damage the boiler and system components. Sludge formed as the result of excessive oxygen in the system can restrict water flow resulting in a premature boiler failure. Any boiler damage due to excessive oxygenation is non-warrantable.

TABLE 4B

SYSTEM TEMPERATURE RISE CHART

Temperature Rise Based on Boiler Input in Btu/hr

Btu/hr

10°F ΔT

20°F ΔT

30°F ΔT

40°F ΔT

50°F ΔT

60°F ΔT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input

Output

GPM

Ft/hd

GPM

Ft/hd

GPM

Ft/hd

GPM

Ft/hd

GPM

Ft/hd

GPM

Ft/hd

497,000

400,950

80+

*

40

4.0

27

1.6

20

0.6

16

0.6

13

0.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

647,000

522,450

129+

*

52

5.1

35

3.0

26

1.2

21

0.8

17

0.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

747,000

603,450

149+

*

60

*

40

4.0

30

1.6

24

1.2

20

0.7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

987,000

831,600

197+

*

80

5.2

53

2.4

40

1.4

32

1.0

27

0.8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1,257,000

1,058,000

251+

*

102+

*

68

4.3

51

2.3

41

1.6

34

1.1

1,437,000

1,209,000

288+

*

116+

*

78

6.0

58

3.7

47

2.2

39

1.7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1,797,000

1,512,000

360+

*

146+

*

97+

*

73

6.2

58

4.2

49

2.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2,067,000

1,738,800

414+

*

168+

*

112+

*

84

8.7

67

6.0

56

4.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+These flow rates exceed recommended flow rates of boiler. If these system temperature rises are used, an external piping bypass must be installed.

*These foot head calculations exceed the maximum allowable flow rate of the boiler. Requires Cupro-Nickel heat exchanger.

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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, Using Ducts Combustion Air OptionsOutside Combustion Air, No Ducts Exhaust Fans Combustion Air from an Interior SpaceVenting support VentingGeneral information Vertical vent termination clearances and locationVent system options Barometric damper locationFlue 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 Pressure Drop Chart Water connections heating boilers onlyBoiler circulator requirements Minimum boiler water temperatures Low system water volumeRun 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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