Lochinvar 400 - 801 service manual Control inputs, LOW Voltage Connection Board

Page 8

Service Manual

1Service

Control inputs

SYSTEM PUMP SPEED CONTROL

GAS PRESSURE SWITCH

DHW THERMOSTAT

ROOM THERMOSTAT /

ZONE CONTROL

FLOW SWITCH

SYSTEM SENSOR

OUTDOOR SENSOR

BUILDING MANAGEMENT

SYSTEM

LOW WATER CUTOFF

INLET TEMPERATURE

SENSOR

OUTLET TEMPERATURE /

HI-LIMIT SENSOR

FLUE GAS SENSOR

LOW VOLTAGE CONNECTION BOARD

AIR PRESSURE SWITCH

LOUVER PROVING SWITCH

FLAME SENSOR

BLOCKED DRAIN SWITCH

DISPLAY PANEL

PC INTERFACE

8

SMART CONTROL

MODULE

Image 8

Contents Models 400 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials 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 VersionFunctions Temperature SettingsData Logging 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 Owner maintenance Maintenance Maintenance and annual startupService technician 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 HighParameters Progr Service BlkRem Ctrl Flt Watch Dog Error No Error StoredLow 24 vac Write EEPromCombustion Analysis Procedure Gas Valve AdjustmentOr Obstruction Gas Supply PressureModels 601 Gas valve adjustment procedureModel Page