Manuals / Roberts Gorden / Household Appliance / Furnace

Roberts Gorden UHD[X][S][R] 125, UHD[X][S][R] 75 service manual TROUBLESHOOTING 13.1 General, Start

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

1 54

Download 54 pages 18.92 Kb

Page 37

SECTION 13: TROUBLESHOOTING 13.1 General

SECTION 13: TROUBLESHOOTING

SECTION 13: TROUBLESHOOTING 13.1 General

WARNING

Explosion Hazard

Installation, service and annual inspection must be done by a contractor qualified in the installation and service of gas-fired heating equipment or your gas supplier.

START

	Are gas & electrical	No
	supplies on?	No
	supplies on?
	Yes
	Is ignition control showing a	Yes
	"4 flashes" LED code?	Yes

No

Turn on supplies.

UHD 75: Press in reset

button on manual reset limit switch. UHD 100 - 125: Wait

10 - 15 minutes for limit Yes switch to cool. Does fan

stop running?

No

Replace temperature limit

switch.

Turn off gas and electrical supplies before performing service or maintenance.

Failure to follow these instructions can result in death, injury or property damage.

Fan and limit switch are operating normally.

	Is ignition control showing a	Yes	Burner has locked out due
	Is ignition control showing a	Yes	to ignition failure. Use
	"2 flashes" LED code?		Troubleshooting for Automatic
			Troubleshooting for Automatic
			Ignition Burner Systems
			section to test burner.
	No
	Does the flue blower run?	No	Use Troubleshooting for
	Does the flue blower run?		Flue Blower section to test
			Flue Blower section to test
			fan.
	Yess
	With external controls (i.e.	No	Has burner “Locked Out”? No
	thermostat) on, does the	No	Has burner “Locked Out”? No
	burner continue through the
	heating cycle?
			Yes
			Use Troubleshooting for
			Automatic Ignition Burner
			Systems section to test burner.
	Yes
	Heater Operating		If problems persist, contact
	Heater Operating	No	Roberts-Gordon, LLC at
	TROUBLESHOOT ENDS.	No	www.rg-inc.com
	TROUBLESHOOT ENDS.		www.rg-inc.com

The limit switch has

tripped. See Manual Reset No Replace limit switch. Limit Switch Figure.

Yes

Ensure air flow through the

heat exchanger is

appropriate per the rating

plate.

31

Image 37

Roberts Gorden UHD[X][S][R] 125, UHD[X][S][R] 75 service manual TROUBLESHOOTING 13.1 General, Start

Contents

UHD-Series Tubular Duct Furnace Low Profile Range CombatModels UHDXSR 75 Quality in Any LanguagePage 2008 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 Tag3.2 Manufactured Units 3.4 Minimum Required Installation Clearances3.5 Clearances to Combustibles Figure 1 Clearances to CombustiblesGas can leak if not installed properly Heaters may be installed vented or unvented3.6 Ventilation Carbon Monoxide Hazard4.2 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 General5.1.3 Air Flow and Temperature Rise Ranges 5.1.1 Minimum Inlet Duct LengthCrush Hazard Use 3/8 threaded rod minimum 5.2 Shelf Mounting and SuspensionFigure 3 Suspension Methods 5.3 Wall MountingFigure 5 Wall Shelf Mounting and Suspension Figure 4 Shelf-MountingMethodsExisting cabinet screws must be re-used SECTION 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 UHDXR6.5 Horizontal Venting 6.6 Vertical Venting6.8 Vent Material 6.7.1 Maximum Vent LengthsModel Figure 6 Vent and Roof DetailUHDXR 90502102Page Figure 10 Concentric Vent Box Part Number DescriptionConcentric Vent Kit UHVK17.2 Unvented Installation 7.1 Separated Combustion InstallationSECTION 7 AIR SUPPLY 7.3 Building Ventilation8.1 Connections SECTION 8 GAS PIPINGFigure 12 Gas Connection Gas can leak if not installed properly9.2 Low Voltage Thermostat with One Heater SECTION 9 WIRING9.1 Positioning Thermostats Electrical Shock Hazard9.3 Internal Wiring Diagram 9.4 Ladder Wiring Diagram 9.5 Electrical Connection to the Heater 10.2 Begin Start-Up SECTION 10 OPERATION AND MAINTENANCE10.2.1 Before Operating the Heater 10.1 Pre-Start-UpChecksFigure 14 Gas Valve Figure 13 Automatic Burner Control SequenceEND VIEW Required Incoming SignalsCheck Gas Rate 10.2.3 Pressure Switch10.2.4 Turning Off the Heater 10.2.5 External ControlsThe fault must be traced and repaired Reset Limit Switch - See Page 26, SectionFigure 15 Manual Reset Limit Switch SECTION 11 USER INSTRUCTIONS11.5.1 Simple Troubleshooting Burner Faults 11.5 Simple TroubleshootingFigure 16 LED Diagnostic Codes 11.4.2 To Turn Heater Off12.3 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 13.1 GeneralTROUBLESHOOT ENDS. No 13.3 Troubleshooting for Flame Supervision System 13.5 Troubleshooting for Flue Blower 13.4 Troubleshooting for Gas ValvesSTART STARTBurner Components SECTION 14 REPLACEMENT PARTS14.1 Gas Valve 14.2.1 Burner Injectors 14.2 Burner CompartmentEnsure gas tight fitting of injectors Ensure correct alignment with burners14.4 Heat Exchanger 14.3 Ignition Electrode and Flame Probe14.5 Flue Blower Vertical Installation 14.8 Limit Switches 14.6 Pressure Switch14.8.1 Removal and Replacement 14.7 Ignition ControlModel SECTION 15 SPECIFICATIONS 15.1 Dimension Data15.3 Technical Data Table 15.2 General Technical Data TablePage ROBERTS GORDON WILL PAY FOR WARRANTY IS VOID IFROBERTS GORDON WILL NOT PAY FOR Roberts-GordonPage OWNER WARRANTY REGISTRATION CARD Mail or Fax toAbout the Installer Purchased From if different than installerPage Page Fire Hazard