Manuals / Roberts Gorden / Household Appliance / Furnace

Roberts Gorden UHD[X][S][R] 75, UHD[X][S][R] 125 Burner Compartment, Burner Injectors

Models: UHD[X][S][R] 125 UHD[X][S][R] 75

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14.2 Burner Compartment

UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

14.2 Burner Compartment

Burner

Compartment

Cover

Viewing port for flame probe

Flame Probe

Ignition Electrode

Remove flexible air duct from spigot

Remove screws and pull off burner cover

The burner compartment is a sealed compartment. Following any work, re-seal the compartment with the gas pipe rubber seal fully in place and all screws fitted and tight.

NOTE: Separated combustion model shown.

14.2.1 Burner Injectors

Inshot

Burners

Orifices

Manifold

Mounting

Bracket Grommet

Manifold

Remove manifold

screws and pull

out manifold

Manifold

Unscrew

Orifices

Marking

Folded

Hem

Ensure gas tight fitting of injectors.

Ensure correct alignment with burners.

Ensure all pipe joints are gas tight.

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

Orifice Quantity	5	6	7

Natural Gas (G20)

Orifice Marking	49	46	46

P/N	91930049	91930046	91930046

Propane (G31)

Orifice Marking	1.15 mm	1.25 mm	1.25 mm

P/N	91930115	91930125	91930125

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Roberts Gorden UHD[X][S][R] 75 service manual Burner Compartment, Burner Injectors, Ensure gas tight fitting of injectors

Contents

Models UHDXSR 75 CombatUHD-Series Tubular Duct Furnace Low Profile Range Quality in Any LanguagePage 2008 Roberts-GordonLLC Page TABLE OF FIGURES Page SECTION 1 HEATER SAFETY 1.1 Manpower Requirements2.3 National Standards and Applicable Codes SECTION 2 INSTALLER RESPONSIBILITY2.2 Corrosive Chemicals 2.1 Wall Tag3.5 Clearances to Combustibles 3.4 Minimum Required Installation Clearances3.2 Manufactured Units Figure 1 Clearances to Combustibles3.6 Ventilation Heaters may be installed vented or unventedGas can leak if not installed properly Carbon Monoxide Hazard4.3 Parking Structures and Repair Garages 4.1 Gas Codes4.2 Aircraft Hangars 4.4 Electrical4.6 High Altitude 5.1.3 Air Flow and Temperature Rise Ranges SECTION 5 DUCT HEATER INSTALLATION 5.1 General5.1.2 Temperature Rise and Pressure Drop Ranges 5.1.1 Minimum Inlet Duct LengthFigure 3 Suspension Methods 5.2 Shelf Mounting and SuspensionCrush Hazard Use 3/8 threaded rod minimum 5.3 Wall MountingFigure 4 Shelf-MountingMethods Figure 5 Wall Shelf Mounting and SuspensionExisting cabinet screws must be re-used 6.1 Changing Vent and Air Intake Orientation 6.3 Vent InstallationSECTION 6 VENTING 6.2 Venting6.5 Horizontal Venting 6.3.1Standard Vented Heaters Models UHDXR6.4 Unvented Operation 6.6 Vertical Venting6.7.1 Maximum Vent Lengths 6.8 Vent MaterialUHDXR Figure 6 Vent and Roof DetailModel 90502102Page Figure 10 Concentric Vent Box Concentric Vent Kit DescriptionPart Number UHVK1SECTION 7 AIR SUPPLY 7.1 Separated Combustion Installation7.2 Unvented Installation 7.3 Building VentilationFigure 12 Gas Connection SECTION 8 GAS PIPING8.1 Connections Gas can leak if not installed properly9.1 Positioning Thermostats SECTION 9 WIRING9.2 Low Voltage Thermostat with One Heater Electrical Shock Hazard9.3 Internal Wiring Diagram 9.4 Ladder Wiring Diagram 9.5 Electrical Connection to the Heater 10.2.1 Before Operating the Heater SECTION 10 OPERATION AND MAINTENANCE10.2 Begin Start-Up 10.1 Pre-Start-UpChecksEND VIEW Figure 13 Automatic Burner Control SequenceFigure 14 Gas Valve Required Incoming Signals10.2.4 Turning Off the Heater 10.2.3 Pressure SwitchCheck Gas Rate 10.2.5 External ControlsFigure 15 Manual Reset Limit Switch Reset Limit Switch - See Page 26, SectionThe fault must be traced and repaired SECTION 11 USER INSTRUCTIONSFigure 16 LED Diagnostic Codes 11.5 Simple Troubleshooting11.5.1 Simple Troubleshooting Burner Faults 11.4.2 To Turn Heater Off12.4 Gas Valve Maintenance 12.2 Burner Maintenance12.3 Heat Exchanger Maintenance SECTION 12 SERVICINGSee Page 3, Section 12.7 Maintenance ChecklistThe Vicinity of the Heater Vehicles and OtherValves when installedGas Line and Shut-off Burner ObservationSECTION 13 TROUBLESHOOTING 13.1 General STARTTROUBLESHOOT ENDS. No 13.3 Troubleshooting for Flame Supervision System START 13.4 Troubleshooting for Gas Valves13.5 Troubleshooting for Flue Blower STARTSECTION 14 REPLACEMENT PARTS Burner Components14.1 Gas Valve Ensure gas tight fitting of injectors 14.2 Burner Compartment14.2.1 Burner Injectors Ensure correct alignment with burners14.3 Ignition Electrode and Flame Probe 14.4 Heat Exchanger14.5 Flue Blower Vertical Installation 14.8.1 Removal and Replacement 14.6 Pressure Switch14.8 Limit Switches 14.7 Ignition ControlSECTION 15 SPECIFICATIONS 15.1 Dimension Data Model15.2 General Technical Data Table 15.3 Technical Data TablePage ROBERTS GORDON WILL NOT PAY FOR WARRANTY IS VOID IFROBERTS GORDON WILL PAY FOR Roberts-GordonPage About the Installer Mail or Fax toOWNER WARRANTY REGISTRATION CARD Purchased From if different than installerPage Page Fire Hazard