Roberts Gorden 225 250, 200, 350, 150, 400, 300 Troubleshooting For Automatic Ignition Burner Systems

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COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

13.2 Troubleshooting For Automatic Ignition Burner Systems

START

Are gas & electrical

No

supplies on?

 

Yes

 

Are external controls

No

(i.e. Thermostat) on?

 

Yes

Is ignition control showing Yes

a "4 flashes" led code?

 

No

 

Does flue blower run?

No

 

Yes

 

Does air pressure switch

No

change over?

 

Yes

 

WARNING

Turn on supplies.

Turn on controls.

Electrical Shock Hazard

 

 

Do not touch ignition components.

 

Voltage from ignition components is high.

 

Failure to follow these instructions can

Press in reset button on

result in death or electrical shock.

manual reset limit switch

 

 

Is 120 V supply at fan

Yes

Flue blower faulty;

connections?

replace

 

No

Burner control faulty or wiring

connections faulty. Repair or replace as necessary

Check for too much vent/air inlet duct. Check for blockage in vent and combustion air circuit. Check for faulty air pressure switch. Check pressure switch hoses for leaks or cracks.

Do not attempt to circumvent pressure switch circuit to

place unit in operation.See Pressure Switch section for details.

Wait 30 - 40 seconds.

No

Does ignition spark

 

Yes

 

Does the flame light?

No

Yes

 

Is ignition control showing

Yes

a "2 flashes" led code?

 

No

Heater Operating

TROUBLESHOOT ENDS. No

Is ignition lead okay and

connected? Yes Is spark electrode okay?

Is the gas valve operating?

To test valve, See No Troubleshooting for Gas

Valves section.

Is the flame current at

least 1 μAmp DC when Yes the flame ignites?

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

Ignition control faulty; replace.

See Ignition Control section.

Replace valve.

Trace fault in supervision

system. See

Troubleshooting

for Flame Supervision

System section.

For your safety and optimum heater performance, use only replacement parts sold and supplied by Roberts-Gordon.

Conduct start-up procedure as shown on Page 19, Section 10.

28

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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 Flue Blower Troubleshooting for Gas ValvesConduct 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 ControlTo Replace the Fan Assembly Fan Removal and ReplacementLimit 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

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