Manuals / Lochinvar / Household Appliance / Water Heater

Lochinvar 151 - 801 Control inputs, Low Voltage, Connection, Smart System Control Board

Models: 151 - 801

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Service Manual

1Service

Control inputs

GAS PRESSURE SWITCH

DHW THERMOSTAT

FLOW SWITCH

TANK SENSOR

SEQUENCER / BUILDING

MANAGEMENT SYSTEM

LOW WATER CUTOFF

INLET TEMPERATURE

SENSOR

OUTLET TEMPERATURE

SENSOR

FLUE GAS SENSOR

AIR PRESSURE SWITCH

LOUVER PROVING SWITCH

FLAME SENSOR

BLOCKED DRAIN SWITCH

DISPLAY PANEL

PC INTERFACE

LOW VOLTAGE

CONNECTION

BOARD

SMART SYSTEM

CONTROL BOARD

Page 6

Image 6

Lochinvar 151 - 801 service manual Control inputs, Low Voltage, Connection, Smart System Control Board, 1Service

Contents

Models AWII-SERRev ASave this manual for future reference Hazard definitions DANGERContents Handling ceramic fiber materials When servicing water heaterPlease read before proceeding Water heater operationMaintenance What is in this manual?Service TroubleshootingNAVIGATION DIAL PRESS OR TURN RESET KEY 1ServiceThe Armor water heater display RIGHT SELECT KEYCONNECTION Control inputsLOW VOLTAGE BOARD1Service continued Control outputsLOW VOLTAGE CONNECTION BOARD SMART SYSTEM CONTROL BOARDGeneral Operation Access modesInstaller How the water heater operatesTable 1A Sequence of operation OPERATIONDISPLAY 1Service continuedSCREEN Display panel menu accessBUTTON OPERATIONSCREEN Display panel parameter accessBUTTON OPERATIONParameter table User AccessInstaller Access MenuParameter table User AccessInstaller Access MenuViewable and changeable control parameters Temperature units C / FDisplay Timeout A GeneralService Mode Delay D DHW SettingsReset last 10 errors B Data LoggingBMS Thermostat Input Active / Inactive ModBus T/O TimeoutF Control modes BMS Active / InactiveBMS Type Power / Set Point DHW Pump DelayDHW Pump Anti-SeizeDelay Minimum On/Off TimeService Notification Running Time I Service NotificationService Notification in Months Service Notification CyclesOwner maintenance 2Maintenance Maintenance and annual startupService technician Table 2A Service and Maintenance SchedulesClean condensate trap 2MaintenanceAddress reported problems Inspect water heater areaCheck water system 2Maintenance continuedFlue vent system and air piping Check expansion tankCheck control settings Check ignition ground wiringCheck all water heater wiring Figure 2-2 Burner AssemblyTable 2B Heat Exchanger Cleaning Kits Check flame signalCleaning heat exchanger Review with ownerCheck control module fuses 3TroubleshootingBefore troubleshooting Check the followingTable 3A Troubleshooting Chart - No Display 3Troubleshooting continuedFAULT CAUSEWire Color - R/BK and Y Checking temperature sensorsTemperature F Wire Color - G and YNo Pump Table 3E Troubleshooting Chart - Noisy SystemNoisy Relief Valve3Troubleshooting Flow SwitchDESCRIPTION FAULT3Troubleshooting continued Anti-cyclingFlame Fail Ign FAULT3Troubleshooting No FlameRunning FAULTFlame Sequence Auto ResetManual Reset High LimitGV/Relay Fan LowFan Speed Low FailFlue Temp High Sensor ShortedLouver Proving Delta T HighRem Ctrl Flt Service BlkOutlet Temp High 3TroubleshootingFatal Error Watch Dog ErrorNo Error Stored Low 24 VACPOSSIBLE CAUSE Combustion Analysis ProcedureGas Valve Adjustment Table 3G Flue ProductsFigure 3-3 Gas Valve Adjustment Model Gas valve adjustment procedureFigure 3-2 Gas Valve Adjustment Models ModelsModels Figure 3-4 Gas Valve Adjustment ModelFigure 3-5 Gas Valve Adjustment Models 3TroubleshootingPage AWII-SERRev A 8/10