Lennox International Inc GWB8-245E-2 Appendix a Control Module, Electrical Connections, Display

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APPENDIX A - CONTROL MODULE

A.1 Installation Environment Considerations

!WARNING

If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

•Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect appliance and to replace any part of control system and any gas control which has been under water.

•Do not allow water to drip on controls. Prevent condensation by allowing air circulation around module and gas control.

•Do not use corrosive chemicals around or on module or gas control.

•Controls can be damaged by excessively high temperatures. Verify adequate air circulation around control is maintained when installing boiler.

A.2 Electrical Connections

Connect Module Connectors Figure 14, Page 18

•L1& L2 leads inside J-box using wire nuts. Secure J- box cover.

•Circulator harness to circulator. Harness comes plugged into module with Molex® plug.

•Thermostat connection to yellow wires marked TT using wire nuts.

•Ensure remaining Molex® plug connectors have not worked loose during transit.

•Check sensing bulb is fully inserted in well and is not loose.

•Refer to enclosed addendum for wiring instructions when using indirect hot water heater.

A.3 Adjusting Settings

To discourage unauthorized changing of settings, procedure to enter adjustment mode is required.

To enter adjustment mode, press UP, DOWN, and I buttons simultaneously for three seconds. Press and release I button until parameter requiring adjustment is displayed.

See Figure 12, page 16.

о“SP_” Setpoint (180 °F default setting; adjustable between 130 and 220 °F)

о“Df_” Setpoint Differential (15 °F default setting; adjustable between 10 and 30 °F)

о“°F_” Degrees Fahrenheit

Press UP or DOWN button until parameter has reached desired value. After 60 seconds without any button inputs,

control automatically returns to READ mode.

A.4 Display

In RUN mode, status items and parameters are viewable.

Example, to display setpoint, control flashs “sp” (setpoint) followed by temperature (i.e., 135), followed by °F or °C.

To read settings, press and release I key to find parameter of interest.

Example, press and release I until setpoint (sp) is displayed, followed by three-digit number, i.e., 190, followed by °F or °C. Press I button again will display (S1T) Sensor 1 Temperature followed by three-digit number and corresponding degree designator.

See Display Readout.

Figure 18 - Display Readout

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Contents GAS-FIRED HOT Water Boilers Product LiteratureBoiler Model Number Flue Diameter Width DimensionsDimensions InchBoiler Ratings and Capacities Ratings and CapacitiesBoilers for USE AT High Altitude Table of Contents Minimum Clearances to Combustible Installation ProcedureCanada Minimum Room Volume, Indoor Air OnlyRoom Cubic Feet Volume Ventilation & Combustion AIRDischarge Connecting Supply and Return PipingRelief Valve Discharge Line Check localFor USE with Cooling Units Temperature Pressure GaugeTypical Hot Water Piping Bypass Piping Circulator on Supply Chimney Sizing Connecting The Vent Damper And Vent ConnectorChimney and Vent Pipe Connection Check Your ChimneyRemoving Existing Boiler From Common Venting System Minimum Vent Pipe ClearanceVent Damper Manual Operation Vent Damper InstallationChecking GAS Piping GAS Supply PipingGas Pipe Sizes Check GAS SupplyThermostat Installation Electrical WiringVent Damper Wiring Electric Power SupplyIntegrated High Limit Electronic Ignition Control Wiring DiagramsWiring Diagrams Integrated High Limit Electronic Ignition Control Filling System with Water General InstructionsTo Turn OFF GAS to Appliance Lighting InstructionsLight this burner by hand Do not use this appliance if any part hasOperating Your Boiler Check Thermostat Operation Maintaining Your Boiler If Burner is Noisy Service HintsIf Your System is not Heating or not Giving Enough Heat Possible Cause What to doEquipment and Optional Accessories Blocked Vent Safety Switch Blocked Vent Safety Shutoff Rollout Switch Flame Rollout Safety ShutoffElectrical Connections Installation Environment ConsiderationsAdjusting Settings Appendix a Control ModuleOperation State Codes OperationBoiler High Limit Temperature Controller TroubleshootingTroubleshooting Error Codes Step ErrorDefinition Intermittent PilotCorrect Pilot Flame 3/8 to 1/2 inch in flame. See , Troubleshooting Pilot FlameLennox Industries Inc. Dallas, Texas
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GWB8-299E-2, GWB8-245E-2, GWB8-280E-2, Gas-Fired Hot Water Boiler, GWB8-262E-2 specifications

Lennox International Inc. is a prominent player in the HVAC industry, renowned for its innovative solutions and high-efficiency products. Among its standout offerings is the GWB8 Gas-Fired Hot Water Boiler, available in various models including GWB8-262E-2, GWB8-245E-2, GWB8-280E-2, and GWB8-299E-2. These units are designed to provide reliable and efficient heating solutions for residential applications.

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