Manuals / Roberts Gorden / Household Appliance / Gas Heater

Roberts Gorden 225 15.9.1Fan Removal and Replacement, Limit Switches, To Replace the Fan Assembly

Models: 175 225 300 250 400 150 350 200

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15.9.1Fan Removal and Replacement

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

15.9.1Fan Removal and Replacement

WARNING

Severe Injury Hazard

Turn off gas and electrical supply before service.

Fan can start automatically at any time.

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

15.10 Limit Switches

15.10.1 Removal and Replacement

1.Remove the electrical connections to the switch.

2.Unscrew the two screws securing the switch.

3.Fit a new switch with two screws.

4.Reconnect the electrical connections and test operation.

Remove the screws

and washers.

Description	Part Number	Qty.
Axial Fan UHA[X][S] 150 - 175	90710417*	1
Axial Fan UHA[X][S] 200 - 250	90710417	1
Axial Fan UHA[X][S] 300 - 400	90710416	2

*For units built after July 2011.

For units built before July 2011, P/N 90710416.

15.9.2 To Replace the Fan Assembly

To replace the fan assembly, reverse the procedure shown above.

•Check that the fan blades are free to rotate before turning on the power to the fan.

•Strictly comply with the color code of the fan

wires to ensure correct operation. See Page 24, Section 10.5 wiring diagram.

•Use only genuine replacement parts sold and supplied by Roberts-Gordon LLC.

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Roberts Gorden 225 15.9.1Fan Removal and Replacement, Limit Switches, To Replace the Fan Assembly, Severe Injury Hazard

Contents

UHA-Series Tubular Unit Heaters Standard Range Installation, Operation & Service ManualCombat Models UHAXS 150, 175, 200, 225 250, 300Page Manuel d’installation, d’operation, et de service Gamme standardModèles UHAXS 150, 175, 200, 225 250, 300, 350, CombatPage 2012 Roberts-GordonLLC Printed in U.S.APage TABLE OF FIGURES Page 1.2 Safety Labels and Their Placement SECTION 1: HEATER SAFETY1.1 Manpower Requirements 1.3 California PropositionFigure 1: UHAXS150 - 175 Label Placement For separated combustion units only 2 ofFigure 2: UHAXS200 - 250 Label Placement For separated combustion units only 3 ofFigure 3: UHAXS300 - 400 Label Placement For separated combustion units only 4 of2.2 Corrosive Chemicals SECTION 2: INSTALLER RESPONSIBILITY2.1 Wall Tag Product Damage Hazard3.5 Ventilation 3.4 Minimum Required Installation Clearances3.2 Manufactured Units 3.6 Gas SupplyFire Hazard 4.2 Clearances To Combustibles5.3 Parking Structures and Repair Garages 5.1 Gas Codes5.2 Aircraft Hangars 5.4 Electrical5.6 High Altitude Crush Hazard Use 3/8 threaded rod minimum SECTION 6: HEATER INSTALLATION 6.1 General6.2 Suspension Figure 5 Suspension MethodsSECTION 7: VENTING Heaters may be installed vented or unvented7.2 Vent Installation Carbon Monoxide Hazard7.4 Horizontal Venting 7.2.1Standard Vented Heaters Models UHAX 150 -7.3 Unvented Operation 7.5 Vertical VentingMaximum Vent Lengths Table 7.7 Vent MaterialFigure 6: Vent and Roof Detail Model 14 ofVertical Option Bend Horizontal Option Part NumberRequirements Heaters must be of the same BTU output15 of Figure 10: Concentric Vent Box 16 ofOption 17 ofVertical HorizontalSECTION 8: AIR SUPPLY 8.1 Separated Combustion Installation8.2 Unvented Installation Explosion Hazard9.1 Connections Gas can leak if piping is not installed properlySECTION 9: GAS PIPING Explosion HazardDo not bend flexible gas connector Figure 12 Gas ConnectionProduct Damage Hazard DANGER SECTION 10: WIRINGDisconnect electric before service Electrical Shock HazardRelay Type 22 ofModel Relay Part NumberRelay Type 23 ofModel Relay Part Number10.5 UHAXS Series Internal Wiring Diagram 10.6 UHAXS Series Ladder Wiring Diagram 10.7 Electrical Connection to the Heater Note: Junction box is not provided with heater26 of before service SECTION 11: OPERATION AND MAINTENANCEheater before service during installationon Page 28, Figure 11.2 Begin Start-Up11.2.1 Before Operating the Heater Figure 13: Automatic Burner Control SequenceCheck Gas Rate 11.2.3 Pressure SwitchFigure 14: Gas Valve for Models UHAXS 150 - 11.2.4 Turning Off the Heater11.2.5 External Controls 11.3 Complete the Start-Up11.3.1 Instruction to the User Figure 15: LED Diagnostic Codes 12.3 Simple Troubleshooting12.3.1 Simple Troubleshooting Burner Fault SECTION 12: USER INSTRUCTIONS13.4 Heat Exchanger Maintenance 13.2 Burner Maintenance13.3 Fan/Motor Assembly Maintenance 13.5 Gas Valve MaintenanceAnnual Fall Start-Up 13.8 Maintenance Checklist13.7 Venting and Air Intake Pipe The Vicinity of the HeaterSee Page 19, Section when installedHeat Exchanger Gas Line and Shut-offbefore service SECTION 14: TROUBLESHOOTINGheater before service during installation14.1 General 36 of37 of 14.3 Troubleshooting for Flame Supervision System 14.4 Troubleshooting for Gas Valves 14.5 Troubleshooting for Flue Blower39 of 15.1 Gas Valve SECTION 15: REPLACEMENT PARTSBurner Components DANGER15.2 Burner Compartment 15.2.1 Burner Injectors15.3 Ignition Electrode and Flame Probe 15.4 Heat Exchanger 15.5 Louvers and Louver Spring15.6 Flue Blower 15.7 Pressure Switch 15.9 Axial Fan/Guard/Motor Assembly15.8 Ignition Control 15.10.1 Removal and Replacement 15.9.1Fan Removal and Replacement15.10 Limit Switches 15.9.2 To Replace the Fan AssemblySECTION 16: SPECIFICATIONS 16.1 Dimension Data 47 of16.2 General Technical Data Table 16.3 Technical Data Table48 of ROBERTS-GORDONLLC WILL NOT PAY FOR WARRANTY IS VOID IFROBERTS-GORDONLLC WILL PAY FOR U.S.APage About the Installer Mail or Fax toOWNER WARRANTY REGISTRATION CARD Purchased From if different than installerPage