Roberts Gorden UHA[X][S] 75 Operation And Maintenance, Pre-Start-UpChecks, Louvers, Gas Supply

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SECTION 10: OPERATION AND MAINTENANCE

SECTION 10: OPERATION AND MAINTENANCE

SECTION 10: OPERATION AND MAINTENANCE

10.1 Pre-Start-Up ChecksWARNING

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.

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

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

Read this manual carefully before installation, operation, or service of this equipment. All components are accessed via the door secured by four sheet metal screws. Opening the door exposes live electrical connections and hot components.

10.1 Pre-Start-Up Checks

All pre-start-up checks must be carried out before lighting the heater.

Ensure that the heater and all controls are suitable for the gas, pressure and electrical supply to which they are to be connected.

10.1.1 Louvers

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.

Where fitted, the air delivery louvers need to be set during start-up to give the required air distribution (optional vertical louvers).

10.1.2 Electrical Checks

All pre-start-up checks must be carried out before start-up the heater.

1.Check that all site wiring is connected in accordance with the appropriate wiring diagram on Page 26, Section 9.5.

10.1.3 Gas Supply

All aspects of the gas installation including the gas meter must be inspected, tested for gas tightness and purged in accordance with local and national codes.

Ensure that the air is fully purged from the heater inlet pipe up to the main gas valve inlet test nipple.

10.1.4 Mechanical Checks

1.Check that the fan is free to run and delivery louvers are turned to give required air deflection.

2.Check that the flue (and air intake for separated combustion units) is installed in accordance with these instructions and local regulations.

10.2 Begin Start-Up

10.2.1 Before Operating the Heater

To ensure that all the controls are in safe working order, operate the heater for the first time with the isolating gas valve turned off and power supply turned on.

1.Turn off the isolating gas valve.

2.Turn up the thermostat above room temperature. The automatic ignition sequence will now begin as described

on Page 30, Figure 16.

There will be no ignition of the burner and lockout will occur, which proves the controls are operating correctly.

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Contents Models UHAXS 30, 45, 60, 75, 100, Installation, Operation & Service ManualCombat UHA-Series Tubular Unit Heaters Low Profile RangePage Printed in U.S.A TABLE OF CONTENTS2008 Roberts-GordonLLC Page TABLE OF FIGURES Page 1.2 Safety Labels and Their Placement SECTION 1: HEATER SAFETY1.1 Manpower Requirements For separated combustion units only Figure 1: UHA 30 - 45 Label PlacementFor separated combustion units only Figure 2: UHA 60 - 75 Label PlacementFor separated combustion units only Figure 3: UHA 100 - 125 Label Placement2.3 National Standards and Applicable Codes SECTION 2: INSTALLER RESPONSIBILITY2.1 Wall Tag 2.2 Corrosive Chemicals3.6 Ventilation 3.4 Minimum Required Installation Clearances3.2 Manufactured Units 3.5 Clearances to Combustibles3.9 Vent 3.7 Gas Supply3.8 Electrical Supply 4.4 Electrical 4.1 Gas Codes4.2 Aircraft Hangars 4.3 Parking Structures and Repair Garages4.6 High Altitude Crush Hazard Use 3/8 threaded rod minimum SECTION 5: MAJOR COMPONENTS 5.1 General5.2 Shelf Mounting and Suspension 5.3 Wall MountingExisting cabinet screws must be re-used Figure 5: Suspension MethodsFigure 6: Shelf-MountingMethods Description DescriptionPart Number Wall Shelf Mounting Bracket Kitspring to remove Figure 8: Vertical Louvers OptionalPush in louver and compress6.2 Venting 6.3 Vent InstallationSECTION 6 VENTING 6.1 Changing Vent and Air Intake Orientation6.5 Horizontal Venting 6.3.1Standard Vented Heaters Models UHAX 30 -6.4 Unvented Operation 6.8 Vent Material 6.6 Vertical Venting6.7 Length Requirements 6.7.1 Maximum Vent LengthsOption Figure 9: Vent and Roof DetailVertical HorizontalPage Option Figure 13: Concentric Vent BoxVertical Option HorizontalVent Terminal 7.3 Building Ventilation 7.1 Separated Combustion Installation7.2 Unvented Installation SECTION 7 AIR SUPPLYFigure 15: Gas Connection SECTION 8: GAS PIPING8.1 Connections 9.2 Low Voltage Thermostat with One Heater SECTION 9: WIRING9.1 Positioning Thermostats 9.1.1 Fan ControlUHAXS 30 - ModelRelay Type Relay Part NumberMax. Number of Heaters UHAXS 60 -DPST 904363009.5 Internal Wiring Diagram 9.6 Ladder Wiring Diagram 9.7 Electrical Connection to the Heater 10.1.2 Electrical Checks SECTION 10: OPERATION AND MAINTENANCE10.1 Pre-Start-UpChecks 10.1.1 LouversSignals Output By Control Figure 16: Automatic Burner Control SequenceFigure 17: Gas Valve for Models UHAXS 30 - Required Incoming Signals10.2.4 Turning Off the Heater 10.2.3 Pressure SwitchFigure 18: Gas Valve for Models UHAXS 60 - Check Gas Rate10.3.1 Instruction to the User 10.2.5 External Controls10.3 Complete Start-Up 11.1 User Instructions Reset Limit Switch - See Page 33, SectionFigure 19: Manual Reset Limit Switch SECTION 11: USER INSTRUCTIONS11.4.2 To Turn the Heater Off 11.5 Simple Troubleshooting11.5.1 Simple Troubleshooting Burner Faults Figure 20: LED Diagnostic Codes12.5 Gas Valve Maintenance 12.2 Burner Maintenance12.3 Fan/Motor Assembly Maintenance 12.4 Heat Exchanger MaintenanceSee Page 6, Section 12.8 Maintenance Checklist12.7 Venting and Air Intake Pipe The Vicinity of the HeaterHeat Exchanger when installedCombustion Air Intake PipeSTART SECTION 13: TROUBLESHOOTING 13.1 GeneralSECTION 13: TROUBLESHOOTING 13.3 Troubleshooting for Flame Supervision System START 13.4Troubleshooting for Gas Valves13.5Troubleshooting for Flue Blower Correct power14.1 Gas Valve SECTION 14 REPLACEMENT PARTSBurner Components 14.2.1 Burner Injectors 14.2 Burner Compartment14.3 Ignition Electrode and Flame Probe Horizontal 14.4 Heat Exchanger14.5 Louver and Louver Springs Install Vertical screws14.6 Flue Blower Vertical Installation 14.8 Ignition Control 14.7 Pressure Switch14.9 Axial Fan/Guard/Motor Assembly 14.10.1 Removal and Replacement 14.9.1 Fan Removal and Replacement14.9.2 To Replace the Fan Assembly 14.10 Limit SwitchesREAR VIEW SECTION 15: SPECIFICATIONS 15.1 Dimension DataTOP VIEW SIDE VIEW15.3 Technical Data Table All Models 15.2 General Technical Data Table All ModelsRoberts-Gordon WARRANTY IS VOID IFROBERTS GORDON WILL PAY FOR ROBERTS GORDON WILL NOT PAY FORPage Type of Installation check one OWNER WARRANTY REGISTRATION CARDAbout the Installer Purchased From if different than installerPage Page injury or property damage Installation ClearancesFire Hazard close to heater
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