Roberts Gorden UHA[X][S] 60, UHA[X][S] 45, UHA[X][S] 30 Gas Piping, Connections, Gas Connection

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SECTION 8: GAS PIPING

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 8: GAS PIPING

8.1 Connections WARNING

Fire Hazard

Connect gas supply according to Figure 15.

Do not use gas supply pipe and electrical connections to support heater’s weight.

Gas can leak if not installed properly.

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

A gas meter is connected to the service pipe by the gas supply company. An existing meter should be checked, preferably by the company, to ensure that the meter is adequate for the rate of gas supply required.

Installation pipes must be fitted in accordance with local and national codes. Pipes of smaller size than the heater inlet gas connection should not be used.

8.1 Connections

Connect the heater to the gas supply ensuring that the final connections are as follows:

Figure 15: Gas Connection

Gas supply pipe work is run in medium or heavy gauge tubing in compliance with local and national codes.

Meter and service must be large enough to handle all the burners being installed plus any other connected load. The gas pipe which feeds the system must be large enough to supply the required gas with a maximum pressure drop of 1/2" wc When gas piping is not included in the layout drawing, contact the local gas supplier.

An isolating valve and union connection should be used and fitted into the supply adjacent to the heater.

A minimum 1/8" NPT plugged tapping accessible for test connection must be installed immediately upstream of the gas supply connection to the heater.

For suspended heaters, an approved metal flexible connection between the isolating valve and the heater may be used. To reduce pressure loss, use one pipe size larger than the heater gas connection.

IMPORTANT - The complete installation must be purged and tested for gas soundness in accordance with local and national codes.

Caution: Do not high pressure (in excess of 1/2 psi [14" wc]) test the gas piping with the burner connected. Close manual shut-off valve during any pressure testing equal to or less than 1/2 psi (14" wc).

Check the pipe and tubing ends for leaks before placing heating equipment into service. When checking for gas leaks, use a soap and water solution; never use an open flame.

Hold gas nipple securely with pipe wrench when attaching the flexible gas connector.

Do not twist flexible gas connector.

Ensure all

joints are gas tight.

Do not bend flexible

gas connector

sharply.

Gas Shut-off Valve

Union

Connection

Option A:

Stainless Steel

Flexible Gas

Figure 15: Gas ConnectionManual backgroundManual backgroundManual background Connector

Option B:

Medium or Heavy

Gauge Pipe

Gas Connector

Drip Leg

Cap

22

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Contents Installation, Operation & Service Manual CombatUHA-Series Tubular Unit Heaters Low Profile Range Models UHAXS 30, 45, 60, 75, 100,Page 2008 Roberts-GordonLLC TABLE OF CONTENTSPrinted in U.S.A Page TABLE OF FIGURES Page 1.1 Manpower Requirements SECTION 1: HEATER SAFETY1.2 Safety Labels and Their Placement Figure 1: UHA 30 - 45 Label Placement For separated combustion units onlyFigure 2: UHA 60 - 75 Label Placement For separated combustion units onlyFigure 3: UHA 100 - 125 Label Placement For separated combustion units onlySECTION 2: INSTALLER RESPONSIBILITY 2.1 Wall Tag2.2 Corrosive Chemicals 2.3 National Standards and Applicable Codes3.4 Minimum Required Installation Clearances 3.2 Manufactured Units3.5 Clearances to Combustibles 3.6 Ventilation3.8 Electrical Supply 3.7 Gas Supply3.9 Vent 4.1 Gas Codes 4.2 Aircraft Hangars4.3 Parking Structures and Repair Garages 4.4 Electrical4.6 High Altitude SECTION 5: MAJOR COMPONENTS 5.1 General 5.2 Shelf Mounting and Suspension5.3 Wall Mounting Crush Hazard Use 3/8 threaded rod minimumFigure 6: Shelf-MountingMethods Figure 5: Suspension MethodsExisting cabinet screws must be re-used Description Part NumberWall Shelf Mounting Bracket Kit DescriptionFigure 8: Vertical Louvers Optional Push inlouver and compress spring to remove6.3 Vent Installation SECTION 6 VENTING6.1 Changing Vent and Air Intake Orientation 6.2 Venting6.4 Unvented Operation 6.3.1Standard Vented Heaters Models UHAX 30 -6.5 Horizontal Venting 6.6 Vertical Venting 6.7 Length Requirements6.7.1 Maximum Vent Lengths 6.8 Vent MaterialFigure 9: Vent and Roof Detail VerticalHorizontal OptionPage Figure 13: Concentric Vent Box Vertical OptionHorizontal OptionVent Terminal 7.1 Separated Combustion Installation 7.2 Unvented InstallationSECTION 7 AIR SUPPLY 7.3 Building Ventilation8.1 Connections SECTION 8: GAS PIPINGFigure 15: Gas Connection SECTION 9: WIRING 9.1 Positioning Thermostats9.1.1 Fan Control 9.2 Low Voltage Thermostat with One HeaterModel Relay TypeRelay Part Number UHAXS 30 -UHAXS 60 - DPST90436300 Max. Number of Heaters9.5 Internal Wiring Diagram 9.6 Ladder Wiring Diagram 9.7 Electrical Connection to the Heater SECTION 10: OPERATION AND MAINTENANCE 10.1 Pre-Start-UpChecks10.1.1 Louvers 10.1.2 Electrical ChecksFigure 16: Automatic Burner Control Sequence Figure 17: Gas Valve for Models UHAXS 30 -Required Incoming Signals Signals Output By Control10.2.3 Pressure Switch Figure 18: Gas Valve for Models UHAXS 60 -Check Gas Rate 10.2.4 Turning Off the Heater10.3 Complete Start-Up 10.2.5 External Controls10.3.1 Instruction to the User Reset Limit Switch - See Page 33, Section Figure 19: Manual Reset Limit SwitchSECTION 11: USER INSTRUCTIONS 11.1 User Instructions11.5 Simple Troubleshooting 11.5.1 Simple Troubleshooting Burner FaultsFigure 20: LED Diagnostic Codes 11.4.2 To Turn the Heater Off12.2 Burner Maintenance 12.3 Fan/Motor Assembly Maintenance12.4 Heat Exchanger Maintenance 12.5 Gas Valve Maintenance12.8 Maintenance Checklist 12.7 Venting and Air Intake PipeThe Vicinity of the Heater See Page 6, Sectionwhen installed Combustion Air IntakePipe Heat ExchangerSECTION 13: TROUBLESHOOTING 13.1 General STARTSECTION 13: TROUBLESHOOTING 13.3 Troubleshooting for Flame Supervision System 13.4Troubleshooting for Gas Valves 13.5Troubleshooting for Flue BlowerCorrect power STARTBurner Components SECTION 14 REPLACEMENT PARTS14.1 Gas Valve 14.2 Burner Compartment 14.2.1 Burner Injectors14.3 Ignition Electrode and Flame Probe 14.4 Heat Exchanger 14.5 Louver and Louver SpringsInstall Vertical screws Horizontal14.6 Flue Blower Vertical Installation 14.9 Axial Fan/Guard/Motor Assembly 14.7 Pressure Switch14.8 Ignition Control 14.9.1 Fan Removal and Replacement 14.9.2 To Replace the Fan Assembly14.10 Limit Switches 14.10.1 Removal and ReplacementSECTION 15: SPECIFICATIONS 15.1 Dimension Data TOP VIEWSIDE VIEW REAR VIEW15.2 General Technical Data Table All Models 15.3 Technical Data Table All ModelsWARRANTY IS VOID IF ROBERTS GORDON WILL PAY FORROBERTS GORDON WILL NOT PAY FOR Roberts-GordonPage OWNER WARRANTY REGISTRATION CARD About the InstallerPurchased From if different than installer Type of Installation check onePage Page Installation Clearances Fire Hazardclose to heater injury or property damage