Lochinvar 502 - 2072, 402 - 2072 service manual

Copper-fin II/IIE Boiler, Water Heater Pool Heater Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid Troubleshooting What is in this manual?Service MaintenanceCopper-fin display ServiceControl inputs Control outputs Sequence of operation General OperationHow the appliance operates How the control module operatesOUT 123.8F129 Sequence of operationHTR Postpurge Display panel menu access Display panel parameter access Parameter table Datalogging Functions Settingsdhw ResetoutdoorAnti-cycle Delay Yes Viewable and changeable control parameters Temperature settings boiler onlyFunctions Data loggingDHW settings Outdoor air reset boiler only Anti-cycling Control modes Cascade Building Management System BMSCirculation pumps Service NotificationSee the User’s Information Manual for instructions Maintenance Maintenance and annual startupService technician Owner maintenanceMaintenance Inspect/replace hot surface igniters Check relief valve Inspect/replace hot surface igniterPerform start-up and checks Check all wiringCheck control settings Inspect and clean burnerChecking combustion air pressure Access to the burner will require the following stepsChecking manifold gas pressure Adjusting combustion air pressureValve Fitting Control Knob Review with owner Inspect and clean the heat exchangerOiled bearing circulators Check the following TroubleshootingBefore troubleshooting Check control module fusesUnit Does Not No DisplayNo Burner OperationResistance Temperature Checking temperature sensorsTemperature Resistance DHW Pump NoisyNo Pump Boiler Pump System PumpFlame Sequence Flow SwitchAnti-cycling Flame CKT ErrorNo Flame Ign HSI Current LowHigh Limit Auto ResetNo Flame RunningSensor Shorted Manual ResetInlet Low Sensor Open APS Closed Louver Proving Tank Open APS OpenRem Ctrl Flt Temp O/ShootLow Voltage Service BlkParameters ProgrProgram EEProm Watch Dog ErrorNo Error Stored Write EEProm