Lochinvar 400 - 801 service manual

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Revision Notes: Revision A (ECO #C05747) initial release. Reflects the new model numbers for the Knight XL upgrade.

Revision B (ECO #C06234) reflects changes made to the Service Notification parameter.

KBXII-SER Rev B 8/10

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Contents Models 400 Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid When servicing boiler What is in this manual? ServiceMaintenance TroubleshootingService Near boiler pipingKnight XL display Navigation DialControl inputs LOW Voltage Connection BoardSmart Control Module Control outputsAccess modes General OperationHow the boiler operates How the control module operatesOperation Display From previous page Sequence of Operation Display panel menu access Button Screen Operation Display StatusDisplay panel parameter access Parameter table GeneralSettings Reset Notification Temperature units C / F Viewable and changeable control parametersDate and Time Software VersionTemperature Settings Data LoggingFunctions DHW Settings Outdoor Reset Anti-Cycling SH Ramp Delay Control modesControlling Sensor BMS Thermostat Input Active / InactiveCascade Offset Minimum On/Off TimeCirculation pumps Service Notification Maintenance Maintenance and annual startup Service technicianOwner maintenance Maintenance Flue vent system and air piping Check water systemCheck expansion tank Check boiler relief valveCheck ignition ground wiring Check all boiler wiringCheck control settings Inspect ignition and flame sense electrodesCheck flame signal Cleaning boiler heat exchangerReview with owner Model Kit Part Component Number DescriptionTroubleshooting Before troubleshootingCheck control module fuses Check the followingNo Display No BurnerOperation Unit Does NotChecking temperature sensors Temperature ResistanceWire Color R/BK and Y Wire Color G and Y Resistance TemperatureNoisy No PumpBoiler Pump System Pump DHW PumpSwitch/LWCO FlowAnti-cycling Flame Fail IgnAuto Reset Flame SequenceHigh Limit Fan LowGV/Relay FailFan High Fan Speed HighFlue Temp High Delta T HighOutlet Temp HighService Blk Rem Ctrl FltParameters Progr Watch Dog Error No Error StoredLow 24 vac Write EEPromCombustion Analysis Procedure Gas Valve AdjustmentOr Obstruction Gas Supply PressureGas valve adjustment procedure ModelModels 601 Page