Roberts Gorden 75, 100, 125 service manual Ignition Control, Limit Switches Removal and Replacement

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SECTION 15: REPLACEMENT PARTS

15.6 Pressure Switch

Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of pressure switch for model. The pressure switches are color coded for each pressure setting.

Carry out a start-up after working on or changing a pressure switch. See Page 26, Section 11.

MODEL	UHD[X][S] 75	UHD[X][S]100	UHD[X][S] 125

Pressure Switch Kit P/N	90439810	90439810	90439803

Color Code	black	black	gray

Set Point in wc	.35	.35	.41

Pressure Switch Snap Ring P/N	90439850	90439850	90439850

15.7 Ignition Control

The control mounts to the heat exchanger plate. Pull out ignition cable and wiring from board, noting their positions. Release the four mounting standoffs. Refit in reverse. Ensure correct location of ignition cable and all other wiring.

15.8 Limit Switches

15.8.1 Removal and Replacement

1.Remove the electrical connections to the switch.

2.Unscrew the two screws securing the switch.

3.Fit a new switch with two screws.

4.Reconnect the electrical connections and test operation.

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Contents Combat Page Combat Page Roberts-Gordon LLC Page Table of Figures Page California Proposition Heater SafetyManpower Requirements Safety Labels and Their PlacementUhdxs 75 Label Placement Combat National Standards and Applicable Codes Installer ResponsibilityWall Tag Corrosive ChemicalsCritical Considerations Clearances to Combustibles National Standards and Applicable Codes High Altitude Minimum Inlet Duct Length Duct Heater Installation 6.1 GeneralTemperature Rise and Pressure Drop Ranges Air Flow and Temperature Rise RangesSuspension Methods Wall MountingShelf-Mounting Methods Canadian Requirements Vent InstallationVenting United States RequirementsLength Requirements Standard Vented Heaters Models Uhdx 75Horizontal Venting Vertical VentingMaximum Vent Lengths Vent MaterialReplacing an Existing Heater in a Venting System Model Standard Vented Heater Common Vertical Vent Termination Concentric Vent Box UHVK1 Outside Combustion Air Supply Unvented InstallationAIR Supply Building VentilationGAS Piping Fire Hazard Connect gas supply according to FigureConnections When attaching flexible gass connector Product Damage HazardHold gas nipple securely with pip wrench Wiring L2 L1 Uhdxs Series Internal Wiring DiagramFlue Blower Transformer GAS Valve Flame Sensor Electrode Uhdxs Series Ladder Wiring DiagramElectrical Connection to the Heater Begin Start-Up Before Operating the Heater Operation and MaintenancePre-Start-Up Checks Electrical ChecksEND View Automatic Burner Control SequenceExternal Controls Pressure SwitchCheck Gas Rate Turning Off the HeaterHeater Operation User InstructionsTo Turn Heater Off Simple TroubleshootingSimple Troubleshooting Burner Faults Lighting Instructions 12.3.1 To Turn On HeaterServicing Objects Annual Fall Start-upVicinity of the Heater Vehicles and OtherHeat Exchanger When installed DuctworkCombustion Air Intake PipeTroubleshooting Start GeneralConduct start-up procedure as shown on Page 26, 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 Flue Blower Vertical Installation Ignition Control Limit Switches Removal and ReplacementTOP View Specifications 16.1 Dimension DataTechnical Data Table General Technical Data TablePage Limitations on Authority Representatives Warranty is Void ifROBERTS-GORDON LLC will not PAY for Roberts-Gordon LLCPage Mail or Fax to Owner Warranty Registration CardPage

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