Roberts Gorden 150, 200, 350, 400, 250, 300, 225 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 fan 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.

Press in reset button on

Failure to follow these instructions can

result in death or electrical shock.

manual reset limit switch

 

Is 120 V supply at fan

Yes

Flue fan faulty; replace

connections?

 

 

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 operate?

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 ROBERTS GORDON® replacement parts.

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 ConnectionsFan Control WiringPositioning Thermostats Low Voltage Thermostat with One HeaterUhas Series Internal Wiring Diagram TransformerUhas 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 Faults To Turn the Heater OffUser Instructions Heat Exchanger Maintenance Burner Maintenance12.3 Fan/Motor Assembly Maintenance Gas Valve MaintenanceVicinity of the Heater Maintenance ChecklistInstallation Code and Annual Inspections All Vehicles and OtherWindow When installedBurner Observation Combustion Fan ScrollTroubleshooting 13.1 General Troubleshooting For Automatic Ignition Burner Systems Result in death or electrical shockTroubleshooting for Flame Supervision System StartTroubleshooting for Combustion Fan 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 Number QtyCombustion Fan Vertical Installation Uhas Fan Removal and Replacement Axial Fan/Guard/Motor AssemblyLimit Switches Removal and Replacement To Replace the Fan AssemblySpecifications Standard Models 150 400 Uhas Series Dimension DataGeneral Technical Data Table All Models Technical Data Table All ModelsROBERTS-GORDON will not PAY for Warranty is Void ifROBERTS-GORDON will PAY for Limitations on Authority RepresentativesPage Page Some objects can catch fire or explode when placed
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175, 225, 300, 250, 400 specifications

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