Roberts Gorden 150, 200, 350, 400, 300, 175 Servicing 12.1 Servicing Instructions, Burner Maintenance

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COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 12: SERVICING 12.1 Servicing Instructions

After start-up, the heater will require maintenance to be carried out annually. If the heater is used in a dirty or dusty area, more frequent maintenance may be necessary.

WARNING

Cut Hazard

Turn off gas and electrical supply before maintenance. Fan can start automatically at any time.

Failure to follow these instructions can result in severe injury or product damage.

NOTE 1: After any maintenance or repair work, always test fire the heater in accordance with the start-up instructions on Page 19, Section 10 through Page 21, Section 10.3.1 to ensure all safety systems are in working order before leaving the heater to operate. Minor faults may be traced by using the troubleshooting charts on Page 27, Section 13 through Page 30, Section 13.5.

NOTE 2: Check all gas pipes and pipe joints to ensure there are no cracks or gas leaks. Any cracks in the pipes or pipe joints must be repaired.

NOTE 3: Inspect all suspended components and hardware. Ensure that they are in good condition, properly tightened, and corrosion free.

12.2 Burner Maintenance

1.Open the door and remove the burner compart- ment cover. See Page 32, Section 14.2.

2.Clean any deposits from the main burner which may have formed in the injectors or venturi of the burner. See Page 32, Section 14.2.

3.Remove the ignition electrode and flame probe. Check condition of ignition electrode and flame probe. Clean off any deposits which may have been formed, check condition of ceramic insulators. Replace as necessary.

12.3 Fan/Motor Assembly Maintenance

The main fan bearings are permanently sealed and do not need lubrication. Before cleaning, turn off gas and electrical supply. Remove the fan and use a small brush or duster to clean the fan blades from each side. Replace fan when done.

12.4 Heat Exchanger Maintenance

The heat exchanger will remain clean unless a problem has developed with combustion. Inspect the heat exchanger. Look for signs of overheating at the front tubes which may indicate burner over firing or persistently low air flows.

12.5 Gas Valve Maintenance

No regular maintenance is required on this device. To change gas control valves, See Page 31, Section 14.1.

Do not repair or disassemble gas valve. Replace faulty gas valves with genuine replacement parts sold and supplied by Roberts-Gordon.

12.6 Flue Blower

The flue blower should not require maintenance. However, if the air pressure switch is causing burner lockout, then remove the flue blower from the vent box by unscrewing the three screws at the mounting plate. Remove the four screws attaching the mounting plate to the fan inlet (See Page 35, Section 14.6). Ensure that the fan is free to run and that the fan wheel is clean.

12.7 Venting and Air Intake Pipe

Inspect all venting and air intake pipe. Ensure that all seams are sealed and suspension points secure. Repair suspension points if any part of the venting or combustion air pipe is sagging. Check to make sure any insulation is not missing or in poor condition. Replace as necessary. Check all venting and air intake components to ensure they are in good condition, gas tight and corrosion-free.

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Contents Combat Page Roberts-Gordon LLC Page Table of Figures Page Heater Safety Manpower RequirementsCorrosive Chemicals Installer ResponsibilityWall Tag National Standards and Applicable CodesCritical Considerations 3.1 Basic Information Minimum Required Installation ClearancesSeparated Combustion Installation Clearances to CombustiblesInstallation Clearances and Clearances to Combustibles National Standards and Applicable Codes Major Components 5.1 General SuspensionUnited States Requirements Vent InstallationVenting 6.1 Venting Canadian RequirementsHorizontal Venting Separated Combustion Heaters Models Uhas 150Unvented Operation Vertical VentingVent Material Vent and Roof DetailStandard Vented Heater Common Vertical Vent Termination Concentric Vent Box Horizontal Building Ventilation Unvented InstallationAIR Supply Outside Combustion Air SupplyGAS Piping ConnectionsPositioning Thermostats WiringLow Voltage Thermostat with One Heater Fan ControlUhas Series Internal Wiring Diagram GAS ValveUhas Series Ladder Wiring Diagram Electrical Connection to the Heater Electrical Checks Operation and MaintenanceLouvers Mechanical ChecksAutomatic Burner Control Sequence Turning Off the Heater Pressure SwitchCheck Gas Rate Complete the Start-UpHeater Operation Simple TroubleshootingSimple Troubleshooting Burner Fault Lighting Instructions 11.3.1 To Turn On HeaterUser Instructions Heat Exchanger Maintenance Burner Maintenance12.3 Fan/Motor Assembly Maintenance Gas Valve MaintenanceVehicles and Other Maintenance ChecklistVicinity of the Heater ObjectsWindow When installedBurner Observation Flue Blower Scroll, WheelTroubleshooting 13.1 General Troubleshooting For Automatic Ignition Burner Systems Result in death or electrical shockTroubleshooting for Flame Supervision System Troubleshooting for Gas Valves Troubleshooting for Flue BlowerConduct start-up procedure as shown on Page 19, Section Replacement Parts Burner ComponentsBurner Compartment Burner InjectorsIgnition Electrode and Flame Probe Description Part NumberExchangerAssembly Louvers and Louver SpringUhas Axial Fan/Guard/Motor Assembly Ignition ControlFan Removal and Replacement To Replace the Fan AssemblyLimit Switches Removal and Replacement Specifications Standard Models 150 400 Uhas Series Dimension DataGeneral Technical Data Table All Models Technical Data Table All ModelsPage ROBERTS-GORDON will not PAY for Warranty is Void ifROBERTS-GORDON will PAY for Limitations on Authority RepresentativesPage Page Page Page Fire Hazard
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225 250, 175, 300, 400, 150 specifications

Roberts Gorden is a recognized leader in the field of heating solutions, particularly renowned for the development of its innovative radiant heating systems. The lineup of models including the Roberts Gorden 250, 300, 400, 150, and 225 features a blend of advanced technology, exceptional efficiency, and versatile applications that cater to various industrial and commercial needs.

At the core of Roberts Gorden products is their radiant heating technology. Unlike conventional heating systems that warm the air, radiant heaters emit infrared radiation, which directly heats objects and people within a space. This method not only provides a comfortable environment but also reduces energy consumption and minimizes the loss of heat, making it an environmentally friendly choice.

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