Lochinvar 497 - 2067 service manual Burners, Terminal strip connection options

Page 38

5 Electrical connections

External EMS connection to terminal strip for stage firing control of

Installation & Service Manual

Figure 5-2_Stand-alone operation

burners

This unit is equipped with a factory installed terminal strip for connection of an energy management system (EMS) to the burner stages. The EMS terminal strip is located in the unit’s control panel. Ensure that all wiring used for connection to this terminal strip is properly sized per the recommendations in TABLE 5A. When connecting an EMS to this terminal strip to sequence on each stage of burner operation, the unit’s internal thermostat or electronic sequencer should be set as an additional high limit control. This will prevent problems between the set

1

+

SYSTEM/TANK

2

+

SENSOR

3+ B2 INTERMITTENT

4+ B1 LIMITS

5+ A2 CONTINUOUS

6+ A1 LIMITS

7

 

 

+

2 NO HIGH FIRE

 

 

8

 

 

+

2 C

ENABLE

 

 

9

 

 

+

1 NO LOW FIRE

 

 

10

 

 

+

1 C

ENABLE

 

 

6

7

8

9

10

1

2

3

4

5

points of the EMS and the boiler’s internal controller.

Figure 5-3_Remote on/off boiler or water heater

Terminal strip connection options

Figure 5-2 shows the position of jumpers as shipped from the factory for stand-alone operation of boilers or water heaters.

Figure 5-3 shows connections to the terminal strip for Remote ON/OFF control of the boiler or water heater. The 1C-1NO jumper must be removed when making these wiring connections. This remote ON/OFF control will provide an Enable/Disable signal to the unit and allow the unit to operate based on the stage set points, until the remote ON/OFF signal is cancelled.

 

1

+

SYSTEM/TANK

 

2

+

SENSOR

 

3

+

B2 INTERMITTENT

 

4

+

B1

LIMITS

 

5

+

A2

CONTINUOUS

Remote

6

+

A1

LIMITS

7

+

2 NO HIGH FIRE

on/off

8

+

2 C

ENABLE

 

 

9

+

1 NO LOW FIRE

 

10

+

1 C

ENABLE

6

7

8

9

10

1

2

3

4

5

Figure 5-4 shows the connections necessary to operate the unit as a two-stage (High/Low Fire) boiler or water heater from an Energy Management System (EMS). The actual

Figure 5-4_Two-stage (high/low fire) boiler or water heater

set point temperatures are controlled by the EMS. The High Fire Offset on the electronic temperature control in the unit must be set to zero and the set point must be set to a value which will function as an upper limit for proper operation under this two-stage control from an EMS.

Figure 5-5 shows the Continuous and Intermittent terminals. External safety devices connected to these terminals will function to protect the unit. Devices connected to the Intermittent terminals (B1 and B2) are monitored only when there is an active Call for Heat. Devices connected to the Continuous terminals (A1 and A2) are monitored continuously and will activate

 

1

+

SYSTEM/TANK

 

2

+

SENSOR

 

3

+

B2 INTERMITTENT

 

4

+

B1

LIMITS

 

5

+

A2

CONTINUOUS

Stage 2

6

+

A1

LIMITS

 

7

+

2 NO HIGH FIRE

 

8

+

2 C

ENABLE

 

9

+

1 NO LOW FIRE

Stage 1

10

+

1 C

ENABLE

 

 

 

 

6

7

8

9

10

1

2

3

4

5

an alarm (if the unit is equipped with the alarm option) anytime the safety device senses an abnormal condition.

Figure 5-5_Field installation safety devices

38

 

1

+

SYSTEM/TANK

Intermittent

2

+

SENSOR

Alarms

3

+

B2 INTERMITTENT

 

 

4

+

B1

LIMITS

 

5

+

A2

CONTINUOUS

Continuous

6

+

A1

LIMITS

7

+

2 NO HIGH FIRE

Alarms

8

+

2 C

ENABLE

 

9

+

1 NO LOW FIRE

 

10

+

1 C

ENABLE

6

7

8

9

10

1

2

3

4

5

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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.

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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