Lochinvar 400 - 801 service manual Models 400

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KBXII-SER Rev B

Service Manual

Models: 400 - 801

WARNING

This manual must only be used by a qualified heating installer / service technician. Read all instructions, including this manual and the Knight XL Installation and

Operation Manual, before installing. Perform steps in the order given. Failure to comply could result in severe personal injury, death, or substantial property damage.

Save this manual for future reference.

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Contents Models 400 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid When servicing boiler Service What is in this manual?Maintenance TroubleshootingNear boiler piping ServiceNavigation Dial Knight XL displayLOW Voltage Connection Board Control inputsControl outputs Smart Control ModuleGeneral Operation Access modesHow the boiler operates How the control module operatesOperation Display From previous page Sequence of Operation Button Screen Operation Display Status Display panel menu accessDisplay panel parameter access General Parameter tableSettings Reset Notification Viewable and changeable control parameters Temperature units C / FDate and Time Software VersionData Logging Temperature SettingsFunctions DHW Settings Outdoor Reset Anti-Cycling Control modes SH Ramp DelayControlling Sensor BMS Thermostat Input Active / InactiveMinimum On/Off Time Cascade OffsetCirculation pumps Service Notification Service technician Maintenance Maintenance and annual startupOwner maintenance Maintenance Check water system Flue vent system and air pipingCheck expansion tank Check boiler relief valveCheck all boiler wiring Check ignition ground wiringCheck control settings Inspect ignition and flame sense electrodesCleaning boiler heat exchanger Check flame signalReview with owner Model Kit Part Component Number DescriptionBefore troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner No DisplayOperation Unit Does NotTemperature Resistance Checking temperature sensorsWire Color R/BK and Y Wire Color G and Y Resistance TemperatureNo Pump NoisyBoiler Pump System Pump DHW PumpFlow Switch/LWCOFlame Fail Ign Anti-cyclingFlame Sequence Auto ResetHigh Limit Fan LowFail GV/RelayFan High Fan Speed HighDelta T High Flue Temp HighOutlet Temp HighRem Ctrl Flt Service BlkParameters Progr No Error Stored Watch Dog ErrorLow 24 vac Write EEPromGas Valve Adjustment Combustion Analysis ProcedureOr Obstruction Gas Supply PressureModel Gas valve adjustment procedureModels 601 Page