Lochinvar 800 Boiler temperature regulation, Outdoor reset operation, if used, Cascade

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Installation & Operation Manual

11 Operating information

Monitor external limits

Connections are provided on the connection board for external limits such as flow switch, low water cutoff, gas pressure switches, and an auxiliary device proving switch. The SMART SYSTEM will shut off the burner and inhibit relighting whenever any of these external limits open.

Run-time and alarm outputs

The boiler provides dry contacts for indicating when the boiler is running, and when it is unable to operate.

Run-time and cycle counting

The control uses two timers to monitor the total hours of burner operation. One timer monitors the time the boiler is firing under 50% of rate. The other timer monitors the time the boiler is firing over 50% rate.

The control uses four (4) ignition counters to monitor the amount of boiler cycles. The first counter counts all ignitions of the control. The second counter counts only ignition attempts that have failed. The third and fourth counters are the same as the first and second respectively, but can be reset by the installer.

Service reminder

The control can be programmed for service reminder notification. This notification will become active when either a set time frame has expired, or a set amount of running hours or cycles has expired (all adjustable by the installer). The display will alternate the standard text on the display screen with Service Due every 5 seconds. The service reminder notification can be reset by the installer.

Error logging

The control will hold in memory the last 10 error codes as well as the last 10 turn-off functions. The date and time of the occurrence will be recorded as well. Only the 10 most current occurrences will be held in memory.

Boiler temperature regulation

Operating temperature (target)

The SMART SYSTEM control module senses water temperature and regulates boiler firing and firing rate to achieve a target temperature. The target temperature can be set between 70°F (21°C) and 190°F (88°C).

•Target temperature is fixed when the outdoor sensor is not installed.

•Target temperature is calculated as described on this page under “Outdoor Reset Operation” and “Target Temperature Boost” when the outdoor sensor is connected.

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High limit operations

When outlet temperature exceeds 200°F (93.3°C), high limit action occurs. The boiler shuts down until the outlet water cools down.

Low water cutoff protection

1.The SMART SYSTEM control module uses temperature sensing of both supply and return areas of the heat exchanger. If the flow rate is too low or the outlet temperature too high, the control module modulates and shuts the boiler down. This ensures boiler shutdown in the event of low water or low flow conditions.

2.Some codes and jurisdiction may accept these integral features of the control in lieu of requiring an additional limit control or low water cutoff. Consult local jurisdiction to determine. A low water cutoff is available from the factory (WTR20009).

Outdoor reset operation, if used

Target temperature with outdoor reset

This feature improves the system’s efficiency as the outdoor temperature warms up.

See the Knight XL Service Manual to change the settings.

Reset curve

The reset curve looks at outdoor air temperature and adjusts the set point.

Cascade

When multiple boilers are installed, they can be wired together in a cascade sequence. A maximum of eight boilers can be controlled from a single control. In this application one boiler would be designated as the Leader control and all others would be designated as Member controls.

Once the Leader boiler receives a call for heat from a room thermostat, the control will determine what the set point will be. If outdoor air reset is desired, connect the outdoor air sensor to the terminals on the Low Voltage Connection Board on the Leader boiler. The set point will be calculated based on the programmed reset curve parameters. See the Knight XL Service Manual to program the reset curve. If outdoor air reset is not desired, do not connect the outdoor air sensor. A fixed temperature set point can be programmed into the control. See page 54 of this manual to program the set point.

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Contents Models 399 Save this manual for future referenceContents When servicing boiler Please read before proceedingKnight XL How it works Air pressure switch Pump relay board ModelModels 600 Ratings Knight XL Boiler =B=R RatingDetermine boiler location Installation must comply withCloset and alcove installations Before locating the boiler, checkFor closet installations, Cpvc or TOPVent and air piping Residential garage installationProvide air openings to room Flooring and foundationProducts to avoid When using an existing vent system to install a new boilerAreas likely to have contaminants When removing a boiler from existing common vent system Model Prepare boilerRemove boiler from wood pallet Gas conversionsLeveling the boiler Models 600General venting Direct venting options Vertical Vent Installing vent or air piping Install vent and combustion air pipingRequirements for installation in Canada General ventingApproved Stainless Steel Vent Manufacturers PVC/CPVC air intake/vent connectionsMake Air inlet pipe materials Stainless steel ventFasNSeal Saf-T Vent Stainless steel air intake/vent connectionsOptional room air Removing from existing ventModel Description Kit Number Air contaminationVent/air termination sidewall If using the alternate sidewall terminationSidewall direct venting Determine location3AClearance to Gravity Air Inlets Prepare wall penetrations Bird Screen TypicalMultiple vent/air terminations Prepare wall penetrations Alternate Field Supplied OptionTermination and fittings Sidewall termination installation Description and usage9Concentric Vent Dimensional Drawing Models 399 11Concentric Vent Sidewall Attachment Multiventing sidewall terminationsVertical direct venting Vent/air termination verticalPrepare roof penetrations 2Vertical Terminations with Multiple BoilersVertical termination installation 4Concentric Vertical TerminationMultiventing vertical terminations Mm see -9,Hydronic piping Hydronic piping Near boiler piping connections Flow switch adjustmentCirculator sizing 20F 25F 30F 35F Head FeetPressure 399 500 600 700 800Near boiler piping components 7Single Boiler Primary/Secondary Piping Number of Units Model Manifold Pipe Sizes in Inches mm Connecting gas supply piping Gas connectionsNatural gas Propane GasIron Pipe Nominal Natural Gas Pipe Capacity ChartCheck inlet gas supply Length of Pipe in Straight FeetGas valve replacement Gas PressureInstallation must comply with Field wiringLine voltage connections High gas pressure switch Outdoor temperature sensorAuxiliary device proving switch Low gas pressure switchSystem supply sensor Alarm contactsWiring of the cascade Boiler management system3Low Voltage Field Wiring Connections Condensate disposal Condensate drainCheck/control water chemistry Freeze protection when usedStart-up Fill and test water systemInspect/fill condensate system Check for gas leaksCheck thermostat circuits Inspect/check condensate lines and fittingsIf boiler does not start correctly Final checks before starting the boilerStart the boiler Check system and boilerFor Your Safety Read Before Operating Set space heating operation Natural Gas PropaneConfiguration of the cascade Set domestic hot water DHW operationOperating information GeneralProtection features Outdoor reset operation, if used Boiler temperature regulationCascade DHW, Night Setback, and Ramp Delay operation with Cascade Sequence of the cascadeSequence of operation BLR IgnitionKnight XL control module ShutdownUser Access modesInstaller To save parameters and exit programmingSet Point Met ServiceStandby PrepurgeSYS ***.*F Control will display the actual fan motor RPMDelay 10V in **.VdcOperation of the cascade Service technician Maintenance Maintenance and annual startupOwner maintenance Clean condensate trap Check all piping for leaks MaintenanceAddress reported problems Inspect boiler areaCheck expansion tank Flue vent system and air pipingCheck water system Check boiler relief valveCheck control settings Check ignition ground wiringCheck all boiler wiring Inspect ignition and flame sense electrodesCleaning boiler heat exchanger Check flame signalReview with owner Diagrams High Voltage2Ladder Diagram Page

800 specifications

Lochinvar 800 is a groundbreaking boiler system designed to meet the heating needs of modern residential and commercial buildings. Renowned for its reliability and advanced technology, the Lochinvar 800 promises efficiency and performance that set it apart from conventional heating systems.

One of the standout features of the Lochinvar 800 is its high-efficiency heat exchanger, which enables significantly lower energy consumption compared to traditional units. This efficiency translates to substantial energy savings, making it not only an environmentally friendly choice but also a cost-effective one. The system boasts an impressive thermal efficiency rating, often exceeding 95%, which ensures that a large portion of the energy consumed is converted into usable heat.

Incorporating cutting-edge control technologies, the Lochinvar 800 utilizes smart controls that enable precise temperature regulation. These controls provide users with the ability to program and adjust settings according to specific heating needs, enhancing comfort while minimizing energy waste. The integration of modulating gas burners further optimizes energy usage, continuously adjusting the output based on the current demand, thereby preventing energy loss.

Another key characteristic of the Lochinvar 800 is its compact and sleek design, allowing for easy installation in various spaces, from utility rooms to commercial settings. The boiler's lightweight construction means that it can be mounted in tight areas, providing flexibility that adapts to the needs of the installation site.

Safety features are a top priority for the Lochinvar 800, equipped with advanced diagnostics and monitoring systems that ensure trouble-free operation. These systems continually assess performance and identify potential issues before they can evolve into serious problems, promoting longevity and reliability.

The Lochinvar 800 is also compatible with various heating distribution systems, including radiant floor heating and traditional radiators, making it a versatile choice for a wide range of applications. Coupled with its low emissions profile, the Lochinvar 800 stands out as a sustainable option in today’s market.

In summary, the Lochinvar 800 represents a new era in boiler design, merging efficiency, innovative technology, and adaptability to meet the challenges of contemporary heating needs. Its advanced features ensure optimal performance while maintaining a commitment to environmental responsibility, making it an ideal solution for energy-conscious consumers.
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