Roberts Gorden UHD[X][S][R] 125, UHD[X][S][R] 75 service manual Ladder Wiring Diagram

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SECTION 9: WIRING

9.4 Ladder Wiring Diagram

120 VAC

FLUE BLOWER

TRANSFORMER

GAS VALVE

FLAME

SENSOR

ELECTRODE

3 2 1

6 5 4

FLAME IGNITION MODULE

SPARK

PRESSURE SWITCH

LIMIT SWITCH LIMIT SWITCH (UHD 300, 350, 400 ONLY)

MANUAL RESET LIMIT SWITCH (UHD 75 - 125 ONLY)

THERMOSTAT CONNECTION

FLUE BLOWER

IMPORTANT:

For field wiring into service junction box, or if any of the original wire supplied with the heater

must be replaced, it must be replaced with wiring material having a temperature rating of at least 105 °C (221 °F) and 600 V. For supply connections, use No. 14 AWG or larger wires.

21

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Contents Combat Page Roberts-Gordon LLC Page Table of Figures Page Manpower Requirements Heater SafetyWall Tag Installer ResponsibilityCorrosive Chemicals National Standards and Applicable CodesClearances to Combustibles Minimum Required Installation ClearancesCritical Considerations 3.1 Basic Information Manufactured UnitsVent VentilationElectrical Supply Gas SupplyNational Standards and Applicable Codes High Altitude Minimum Inlet Duct Length Duct Heater Installation 5.1 GeneralTemperature Rise and Pressure Drop Ranges Air Flow and Temperature Rise RangesWall Mounting Shelf Mounting and SuspensionShelf-Mounting Methods United States Requirements Vent InstallationVenting Changing Vent and Air Intake OrientationHorizontal Venting Standard Vented Heaters Models Uhdxr 75Separated Combustion Heaters Models Uhdxsr 75 Unvented OperationMaximum Vent Lengths Vent MaterialReplacing an Existing Heater in a Venting System Vent and Roof Detail Standard Vented Heater Common Vertical Vent Termination Concentric Vent Box UHVK1 Building Ventilation Separated Combustion InstallationUnvented Installation AIR SupplyConnections GAS PipingWiring Low Voltage Thermostat with One HeaterPositioning Thermostats L2 L1 Internal Wiring DiagramFlue Blower Transformer GAS Valve Flame Sensor Electrode Ladder Wiring DiagramElectrical Connection to the Heater Electrical Checks Operation and MaintenanceBegin Start-Up Before Operating the Heater Pre-Start-Up ChecksEND View External Controls Pressure SwitchCheck Gas Rate Turning Off the HeaterLighting Instructions 11.4.1 To Turn On Heater User InstructionsUser Instructions Heater OperationSimple Troubleshooting Simple Troubleshooting Burner FaultsTo Turn Heater Off Servicing Objects Maintenance ChecklistVicinity of the Heater Vehicles and OtherBurner Observation When installed DuctworkGas Line and Shut-off ValvesTroubleshooting 13.1 General Conduct start-up procedure as shown on Page 23, Section Troubleshooting For Automatic Ignition Burner SystemsTroubleshooting for Flame Supervision System Troubleshooting for Flue Blower Troubleshooting for Gas ValvesBurner Components Replacement PartsBurner Injectors Burner CompartmentIgnition Electrode and Flame Probe Top, remove the blower and mounting plate as above Flue Blower Vertical InstallationIgnition Control Limit Switches Removal and ReplacementTOP View Specifications 15.1 Dimension DataTechnical Data Table General Technical Data TablePage Limitations on Authority Representatives Warranty is Void ifRoberts Gordon will not PAY for Roberts-GordonPage Owner Warranty Registration Card Page Page Clearances to Combustibles