Lochinvar 497 - 2067 Temperature adjustment, Locating the temperature control, OJ1 OJ2

Page 39

Installation & Service Manual

5 Electrical connections (continued)

Temperature adjustment

Note: The temperature controller is preset at the factory with test settings. You may need to adjust the settings to meet your specific needs.

WARNING Return water temperatures must not be less than 140°F. If lower return water temperatures

are required, follow the instructions for Low Temperature Return Water Systems on page 30.

Locating the temperature control

The temperature control is located behind the panel on the left front of the unit (see FIG. 5-6). Follow the steps below to access the temperature control.

1.Loosen the knurled knob at the bottom of the control panel cover.

2.Pull the bottom of the panel out and down to remove.

Figure 5-7_Temperature control setting knobs

OJ1

OJ2

SETPOINT

 

 

 

HIGH-FIRE

 

 

 

 

 

OFFSET

 

 

DIFFERENTIAL

 

 

 

 

 

OJ1

OJ2

Temperature control settings

There are three setting knobs on the temperature control unless your unit is specified as a boiler only with an outdoor air reset option. If your unit is a boiler only with an outdoor air reset option, there are additional controls for this option. They are explained under Outdoor Air Reset Option, page 40.

The three setting knobs on the temperature control are for Set Point, Differential, and High-Fire Offset (see FIG. 5-7).

Maximum set point

The maximum set point for the control is factory set. Boilers are set to 230°F max., water heaters are set to 190°F max., and specialty state and local codes to 200°F.

These maximum set points are established by not cutting/ cutting the OJ1 and OJ2 jumpers located on the right side of the temperature controller (see FIG. 5-7). The maximum set point is determined as shown in Table 5B.

Figure 5-6_Locating temperature control

TEMPERATURE

CONTROL

TABLE 5B

Maximum Setpoint Determination

OJ1

OJ2

Max.

Setpoint

 

 

 

 

 

Connected

Connected

230°

Cut

Connected

190°

Connected

Cut

200°

Cut

Cut

160°

NOTICE

Anytime that OJ1 is the only jumper cut, a

new overlay is required under the Set Point

 

knob on the temperature controller because

 

the scale has changed to a maximum of

 

190°F.

Anytime the OJ2 jumper is cut (with or without OJ1), a new overlay is required under the Set Point knob on the temperature controller because the scale has changed to a maximum of 200°F.

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Contents Save this manual for future reference What to do if YOU Smell GASContents Checking equipment WarrantyPlease read before proceeding Special instructionsCodes Safety informationOwner warning Prevention of freezingCopper-fin How it works Copper-fin How it works Models 987 2067 Front View Models 987 2067 Rear View Copper-fin =B=R Rating RatingsCopper-fin Specifications Indoor clearances from combustible construction InstallationDetermine unit location Locating the unitPump operation Outdoor boiler installationShut-down and draining Freeze protectionNumber Freeze Protection for a Heating Boiler System if requiredCombustion and Ventilation Air Minimum Recommended Combustion AIR Supply to Equipment RoomCombustion air filter 3Combustion air filter Models 497Outside Combustion Air, Using Ducts Combustion Air OptionsOutside Combustion Air, No Ducts Combustion Air from an Interior Space Exhaust FansVertical vent termination clearances and location VentingGeneral information Venting supportVent system options Barometric damper locationFlue Pipe Sizes Model Flue Size Common venting systems Conventional negative draft ventingNegative draft Flue outlet pipingInspection of a masonry chimney Masonry chimney installationOutdoor vent/air inlet location Outdoor installation ventingOutdoor Vent Kits Model Pump Cover Without Pump Cover Outdoor vent kitInlet GAS Pressure Natural Model Connecting to gas supply Gas pipingGas connections Gas pressure testFittings to Equivalent Straight Pipe Suggested GAS Pipe Size for Single Unit InstallationsGas connection Gas train and controlsChecking gas supply pressure GAS Piping Size ChartCombination gas valves Venting of combination gas valves3Measuring gas supply pressure at combination gas valve Gas manifold pressure adjustmentNat. Gas 4Measuring manifold gas pressureWater 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 LTV Valve Kits Model LTV Valve KIT Low temperature return water systemsSystem Temperature Rise Chart Radiant floor and snow melt heating systemsCommon Manifold Size Min Models 987 Number of Units Common Manifold Size Min Models 497 Number of UnitsGPM Diameter6Primary/secondary piping of multiple boilers 7Boiler with low temperature bypass 8Primary/secondary piping with buffer tank General plumbing rules Installation with a chilled water systemTypical heating boiler installations Boiler flow rateWater treatment Temperature / pressure gaugeBoiler bypass requirements Filling the systemVAC Connecting to electrical supplyElectrical connections AMP Draw DataTerminal strip connection options BurnersOJ1 OJ2 Temperature adjustmentLocating the temperature control Temperature control settingsOutdoor reset option Boiler application Temperature control sensorsRemote sensor for pump delay Placement of sensorsHot surface igniter and ignition control module Remote Wire Connection Wire Gauge Max. Allowable LengthHot surface ignition system Remote mounting of a sensorIgnition and control timings Diagnostic Status IndicationSix Operation and diagnostic lightsSequence Constant Ignition Stage 2 onOFF StartupPurge air from water system Freeze protection when usedCheck/control water chemistry Fill and test water systemStart the boiler Check for gas leaksCheck thermostat circuits Check vent and air pipingMaximum Water Flow Domestic water heatersWater velocity control Initial set-up of maximum water flow1Typical water heater piping with storage tank 2Single water heater piping with two storage tanks Models 497 Number of Units Common Manifold Size Min4Multiple water heater piping with multiple storage tanks Water chemistry Required temperature risePipe Sizing Chart 497 987 Pipe size requirementsHeat exchanger Potable hot water temperature control settingsDomestic water temperature Minimum pump performanceLocation of cold water supply piping connections Cathodic protection High water temperature limit controlOptional relief valve Thermal expansionMaintenance Combustion and ventilation air Adjustment procedure Models 497 Overview Sequence of operationServicing a hot surface igniter and ignition module Ignition system checkoutEnd of sequence Heat transfer processGlossary Hi-Lo Fire Relay Pump Delay Electronic Thermostat FunctionTrial for Ignition Ignition Module Function Igniter Controlled by Ignition ModuleLadder diagram DiagramsDiagrams 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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