Manuals / Roberts Gorden / Household Appliance / Furnace

Roberts Gorden UHD[X][S][R] 250, UHD[X][S][R] 300, UHD[X][S][R] 400 Heat Exchanger, Flue Blower

Models: UHD[X][S][R] 175 UHD[X][S][R] 150 UHD[X][S][R] 200 UHD[X][S][R] 225 UHD[X][S][R] 350 UHD[X][S][R] 400 UHD[X][S][R] 250 UHD[X][S][R] 300

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SECTION 14: REPLACEMENT PARTS

14.4 Heat Exchanger

The heat exchanger consists of a four-pass design with 1.75" outer diameter [409 stainless steel] tube. The tube plates are made of [aluminized steel] [409 stainless steel]. The tube supports are made of [galvannealed steel] [409 stainless steel].

14.5 Flue Blower

Remove screws securing outlet flange to the flue adapter.

Refit in reverse order.

Remove screws securing flue blower mounting plate to vent box.

Remove screws securing mounting plate to blower.

Refit in reverse.

Use new gaskets.

Ensure sealed joints.

Ensure mounting plate orifice is clear and not obstructed.

	UHD[X][S][R]	UHD[X][S][R]	UHD[X][S][R]
MODEL	150 - 175	200 - 300	350 - 400

Flue Blower P/N	90710405	90710403	90710402

IT IS IMPORTANT THAT ONLY THE CORRECT FLUE BLOWER SPECIFIED FOR EACH MODEL TYPE IS USED WHEN REPLACING THESE ITEMS.

Carry out a start-up after working on or changing a flue blower. See Page 24, Section 11.

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Roberts Gorden UHD[X][S][R] 250, UHD[X][S][R] 300, UHD[X][S][R] 400, UHD[X][S][R] 350 Heat Exchanger, Flue Blower

Contents

Combat Installation, Operation & Service ManualUHD-Series Tubular Duct Furnace Standard Range Models UHDXSR 150, 175, 200, 225 250, 300, 350,Page Printed in U.S.A TABLE OF CONTENTS2008 Roberts-GordonLLC Page TABLE OF FIGURES Page 1.1 Manpower Requirements SECTION 1: HEATER SAFETY2.2 Corrosive Chemicals SECTION 2 INSTALLER RESPONSIBILITY2.3 National Standards and Applicable Codes 2.1 Wall Tagaccess to all serviceable components • Must be installed in a manner which allows3.4 Minimum Required Installation Clearances 3.2 Manufactured Units3.7 Gas Supply 3.6 Ventilation3.8 Electrical Supply 3.9 Vent4.2 Aircraft Hangars 4.1 Gas Codes4.3 Parking Structures and Repair Garages 4.4 Electrical4.6 High Altitude 5.1.2 Temperature Rise and Pressure Drop Ranges SECTION 5 DUCT HEATER INSTALLATION 5.1 General5.1.1 Minimum Inlet Duct Length Figure 2 Air Flow Direction5.2 Suspension 5.1.3 Air Flow And Temperature Rise RangesFigure 3: Suspension Methods Crush Hazard Use 3/8 threaded rod minimumSECTION 6: VENTING 6.3 Vent Installation6.1 Changing Vent and Air Intake Orientation 6.2 Venting6.4 Unvented Operation 6.3.1Standard Vented Heaters Models UHDXR 150 -6.5 Horizontal Venting 6.6 Vertical VentingFigure 4: Vent and Roof Detail 6.7.1 Maximum Vent Lengths6.8 Vent Material UHDXR 150 - Model90502102 Vent DiameterHorizontal Option Figure 8 Concentric Vent BoxVertical Option Description 7.2 Unvented Installation 7.1 Separated Combustion InstallationSECTION 7: AIR SUPPLY 7.3 Building VentilationFigure 10 Gas Connection SECTION 8 GAS PIPING8.1 Connections 9.2 Low Voltage Thermostat with One Heater SECTION 9 WIRING9.1 Positioning Thermostats 9.3 Internal Wiring Diagram FLAME SENSOR ELECTRODE 9.4 Ladder Wiring Diagram120 VAC FLUE BLOWER TRANSFORMER GAS VALVE 9.5 Electrical Connection to the Heater 10.1 Pre-Start-UpChecks SECTION 10: OPERATION AND MAINTENANCE10.1.1 Electrical Checks 10.1.2 Gas SupplyFigure 12: Gas Valve Figure 11: Automatic Burner Control SequenceEND VIEW TOP VIEWCheck Gas Rate 10.2.3 Pressure Switch10.2.4 Turning Off the Heater 10.2.5 External Controls11.4.1 Simple Troubleshooting Burner Faults 11.4 Simple TroubleshootingFigure 13 LED Diagnostic Codes SECTION 11 USER INSTRUCTIONS12.3 Heat Exchanger Maintenance 12.2 Burner Maintenance12.4 Gas Valve Maintenance SECTION 12: SERVICINGThe Vicinity of the Heater 12.7 Maintenance ChecklistSee Page 3, Section Vehicles and OtherGas Line and Shut-off when installedValves Burner ObservationSTART SECTION 13 TROUBLESHOOTING 13.1GeneralTROUBLESHOOT ENDS. No 13.3 Troubleshooting for Flame Supervision System 13.5 Troubleshooting for Flue Blower 13.4Troubleshooting for Gas ValvesSTART STARTBurner Components SECTION 14: REPLACEMENT PARTS14.1 Gas Valve Remove the gas supply pipe at the heater inlet14.2.1 Burner Injectors 14.2 Burner CompartmentNOTE: Separated combustion Ensure gas tight fitting of injectors14.3 Ignition Electrode and Flame Probe 14.5 Flue Blower 14.4 Heat Exchanger14.8 Limit Switches 14.6 Pressure Switch14.8.1 Removal and Replacement 14.7 Ignition ControlSECTION 15 SPECIFICATIONS 15.1 Dimension Data 15.3 Technical Data Table 15.2 General Technical Data TableROBERTS GORDON WILL PAY FOR WARRANTY IS VOID IFROBERTS GORDON WILL NOT PAY FOR U.S.APage About the Installer OWNER WARRANTY REGISTRATION CARDPurchased From if different than installer Type of Installation check onePage Page Fire Hazard