Manuals / Lochinvar / Household Appliance / Plumbing Product

Lochinvar 402 - 2072 service manual CFX-CHX-SERRev B 11/12

Models: 402 - 2072

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Revision Notes: Revision A (ECO #C11226) initial release to reflect the new manual name and removal of the pool heater information.

Revision B (ECO C11706) reflects the update of information with the “SH Controlling Sensor (boiler only)” section on page 22.

CFX-CHX-SER Rev B 11/12

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Lochinvar 402 - 2072 service manual CFX-CHX-SERRev B 11/12

Contents

Save this manual for future reference Copper-finII/IIE Boiler and Water HeaterCFX-CHX-SERRev B Contents Hazard definitionsDANGER When servicing appliance Please read before proceedingHandling ceramic fiber materials Appliance operationWhat is in this manual? ServiceMaintenance Troubleshooting1 Service The Copper-findisplayControl inputs 1 ServiceControl outputs 1 Service continuedGeneral Operation 1 ServiceInstaller How the appliance operatesDISPLAY Sequence of operationOPERATION 1 Service Sequence of operationOPERATION DISPLAYDisplay panel menu access 1 Service continuedCascade Display panel parameter access1 Service ONLY Parameter table A - Boiler Operation1 Service continued Parameter table A - Boiler Operation continued 1 ServiceParameter table B - Water Heater Operation 1 Service continued1 Service Viewable and changeable control parameters Temperature settingsTemperature units General1 Service Manual reset high limitAuto reset high limit boiler only Clear error logDHW settings DHW/SH switching time boiler onlySH/DHW switching time boiler only Freeze protection pump on1 Service Outdoor air reset boiler onlyFigure 1-1 OutdoorAir Reset Curve Outdoor air reset operationShift reset curve Boost temperatureMinimum On/Off delay Stages Next on delay1 Service Enable input active / inactiveModBus timeout Control modesMinimum power Maximum powerBuilding Management System BMS Cascade1 Service Service NotificationSystem pump delay boiler only SH pump delay boiler only2 Maintenance Maintenance and annual startup Service technicianOwner maintenance see the following pages for instructions2 Maintenance Address reported problemsInspect appliance area Inspect appliance interior2 Maintenance continued Check relief valveInspect/replace hot surface igniters Inspect/replace hot surface igniterCheck all wiring Check control settingsInspect and clean burner Perform start-upand checks2 Maintenance continued Adjusting combustion air pressure Checking manifold gas pressure2 Maintenance All modelsRegulator Pressure Less Front Chamber Pressure 2 Maintenance continuedTABLE 2B Net Manifold Pressure Inspect and clean the heat exchanger Review with ownerOiled bearing circulators 2 Maintenance3 Troubleshooting Before troubleshootingCheck control module fuses Check the followingFAULT CAUSECORRECTIVE ACTION 3 Troubleshooting3 Troubleshooting continued Checking temperature sensorsWire Color - R and W Wire Color - Bk and G3 Troubleshooting FAULTTable 3D Troubleshooting Chart - Noisy System CAUSEDESCRIPTION 3 Troubleshooting continuedFAULT Flow Switch3 Troubleshooting FAULTError Gas Connections Section in the Installation and3 Troubleshooting continued FAULTAuto Reset Gas Connections Section of the Installation and3 Troubleshooting FAULTManual Reset the RESET button on3 Troubleshooting continued FAULTDESCRIPTION CORRECTIVE ACTION3 Troubleshooting FAULTDESCRIPTION CORRECTIVE ACTION3 Troubleshooting continued FAULTService Blk Watch Dog ErrorCFX-CHX-SERRev B 11/12