Lochinvar 399 - 800 Inspect ignition and flame sense electrodes, Check ignition ground wiring

Page 26

Service Manual

2Maintenance

Inspect ignition and flame sense electrodes

1.Remove the ignition and flame sense electrodes from the boiler heat exchanger access cover.

2.Remove any deposits accumulated on the ignition/flame sense electrode using sandpaper. If the electrodes cannot be cleaned satisfactorily, replace with new ones.

3.Replace ignition/flame sense electrode, making sure gasket is in good condition and correctly positioned.

Check ignition ground wiring

1.Inspect boiler ground wire from the heat exchanger access cover to ground terminal strip.

2.Verify all wiring is in good condition and securely attached.

3.Check ground continuity of wiring using continuity meter.

4.Replace ground wires if ground continuity is not satisfactory.

Check all boiler wiring

1.Inspect all boiler wiring, making sure wires are in good condition and securely attached.

Check control settings

1.Set the SMART SYSTEM control module display to Parameter Mode and check all settings. See Section 1 of this manual. Adjust settings if necessary. See Section 1 of this manual for adjustment procedures.

2.Check settings of external limit controls (if any) and adjust if necessary.

Check burner flame

1.Inspect flame through observation window.

2.If the flame is unsatisfactory at either high fire or low fire, turn off boiler and allow boiler to cool down. Remove the burner and clean it thoroughly using a vacuum cleaner or compressed air. Do not use compressed air to clean burner if performed inside a building.

3.Remove the burner, reference FIG.’s 2-2 thru 2-4.

4.When replacing the burner, ensure gasket is in good condition and positioned correctly (FIG.’s 2-2 thru 2-4).

Figure 2-2Burner Assembly - Model 399

AIR / GAS ARM

BURNER

GASKET

SCREWS

(QTY. 5)

Figure 2-3Burner Assembly - Model 500

Perform start-up and checks

1.Start boiler and perform checks and tests specified in Section 10 - Start-up of the Knight XL Installation and Operation Manual.

2.Verify cold fill pressure is correct and that operating pressure does not go too high.

26

AIR / GAS ARM

BURNER

GASKET

SCREWS (QTY. 5)

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Contents Models 399 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials When servicing boiler Maintenance What is in this manual?Service TroubleshootingService Near boiler pipingKnight XL display Menu / Exit UP DownControl inputs Smart Control Module Control outputsHow the control module operates General OperationHow the boiler operates Sequence of operationSequence of operation BLR IgnitionBLR SH 41% Rate Display panel menu access Use this procedure to access menus from the display panelDisplay panel parameter access Value will appearTemperature Data Parameter tableControl Circulation Service Temperature settings Viewable and changeable control parametersData logging DHW settingsOutdoor air reset FunctionsMaximum SH set point Maximum air temperatureShift reset curve Minimum SH set pointAnti-cycling SH source Control modesSH controlling sensor Boiler cascade addressCirculation pumps Service NotificationCascade offset Owner maintenance Maintenance Maintenance and annual startupService technician Maintenance Check 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 electrodesReview with owner Check flame signalCleaning boiler heat exchanger Check control module fuses TroubleshootingBefore troubleshooting Check the followingOperation No DisplayNo Burner Unit Does NotChecking temperature sensors Temperature ResistanceOperation Boiler Pump NoisyNo Pump System PumpFlame Switch/LWCOFlow SequenceAnti-cycling No Flame IgnNo Flame RunningFan Low Adjustable HighLimit w/Manual Fan Speed LowSensor Open Fan HighFan Speed High Sensor ShortedTemp O/Shoot Progr Rem Ctrl FltParameters OpenNo Error Stored Service BlkWatch Dog Error Low 24 VACOr Obstruction Combustion Analysis ProcedureGas Valve Adjustment Gas Supply PressureModels 600 Gas valve adjustment procedureModel Page Page KBX-SER Rev E
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399 - 800 specifications

Lochinvar is known for its cutting-edge water heating and boiler systems, and the Lochinvar 399 - 800 series is no exception. Specifically designed for commercial applications, this series brings advanced technology and engineering to the forefront of hydronic heating solutions.

One of the standout features of the Lochinvar 399 - 800 series is its impressive efficiency. Equipped with a condensing design, these boilers utilize high-efficiency stainless steel heat exchangers that allow for maximum heat transfer while minimizing energy consumption. With an impressive thermal efficiency of up to 96%, the Lochinvar 399 - 800 series stands out in its class, offering significant energy savings and reduced operational costs over time.

Another key characteristic of this series is its robust construction. Designed with longevity in mind, the boilers are built using high-quality materials that withstand extreme temperatures and pressures. The stainless steel design not only enhances durability but also combats corrosion, ensuring a long service life and reduced maintenance costs for users.

The Lochinvar 399 - 800 series also incorporates advanced control technologies. With its intuitive control system, users can easily adjust and monitor heating parameters, ensuring optimal performance and comfort. The integrated Control Wizard feature simplifies the setup process, allowing for quick commissioning and troubleshooting. Additionally, the optional Lochinvar SMART CONTROL technology provides remote monitoring capabilities, allowing operators to keep track of system performance from anywhere.

Versatility is another hallmark of the Lochinvar 399 - 800 series. These boilers come in a range of sizes, with the ability to modulate output based on real-time heating demands. This flexibility ensures that systems can operate efficiently under varying load conditions, making them ideal for schools, hospitals, and commercial buildings requiring consistent hot water availability.

In summary, the Lochinvar 399 - 800 series exemplifies modern boiler technology, combining energy efficiency, durability, advanced controls, and versatility. As businesses and facilities seek to enhance their heating systems, the Lochinvar 399 - 800 offers a reliable and forward-thinking solution for today's energy-conscious environment. Investing in this state-of-the-art boiler system not only improves comfort but also fosters sustainability and cost-effectiveness in commercial heating applications.
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