Roberts Gorden UHD[X][S][R] 125, UHD[X][S][R] 75 Wiring, Low Voltage Thermostat with One Heater

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SECTION 9: WIRING

SECTION 9: WIRING

WARNING

Electrical Shock Hazard

Disconnect electrical and gas supply before servicing.

This appliance must be connected to a properly grounded electrical source.

Failure to follow these instructions can result in death or electrical shock.

All heater models require constant 120 V/1Ø/ 60 Hz power supply. Check heater rating plate for electrical rating for proper circuit sizing. For servicing, a disconnect switch of proper electrical rating should be installed in the vicinity of the heater.

9.2 Low Voltage Thermostat with One Heater

All heaters are equipped with thermostat connections suitable to power a 24 V thermostat. Heater must be wired and electrically grounded in accordance with local codes. In the absence of local codes in accordance with: United States: refer to National Electrical Code® NFPA 70 - latest revision; Canada: refer to Canadian Electrical Code CSA C22.1 Part I - latest revision.

9.1 Positioning Thermostats

A room thermostat should be mounted on a vibration-free wall or column at a height of approximately 5' (1.5 m) from the floor to measure the ambient temperature. It should be clear of both cold drafts and the direct path of warm air from the heater.

Avoid mounting thermostat on outside walls or in areas directly exposed to radiant heat or sunlight. Install wall tag in a visible location near thermostat. See Page 2, Section 2.1 for wall tag details.

24 Volt

Thermostat

Terminal

Strip

Gas

G

 

 

R

 

Supply

W

 

 

 

C

 

Electrical

Supply

R

W

19

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Contents Combat Page Roberts-Gordon LLC Page Table of Figures Page Manpower Requirements Heater SafetyCorrosive Chemicals Installer ResponsibilityNational Standards and Applicable Codes Wall TagCritical Considerations 3.1 Basic Information Minimum Required Installation ClearancesManufactured Units Clearances to CombustiblesElectrical Supply VentilationGas Supply VentNational Standards and Applicable Codes High Altitude Temperature Rise and Pressure Drop Ranges Duct Heater Installation 5.1 GeneralAir Flow and Temperature Rise Ranges Minimum Inlet Duct LengthWall Mounting Shelf Mounting and SuspensionShelf-Mounting Methods Venting Vent InstallationChanging Vent and Air Intake Orientation United States RequirementsSeparated Combustion Heaters Models Uhdxsr 75 Standard Vented Heaters Models Uhdxr 75Unvented Operation Horizontal VentingVent Material Maximum Vent LengthsReplacing an Existing Heater in a Venting System Vent and Roof Detail Standard Vented Heater Common Vertical Vent Termination Concentric Vent Box UHVK1 Unvented Installation Separated Combustion InstallationAIR Supply Building VentilationConnections GAS PipingLow Voltage Thermostat with One Heater WiringPositioning Thermostats L2 L1 Internal Wiring DiagramFlue Blower Transformer GAS Valve Flame Sensor Electrode Ladder Wiring DiagramElectrical Connection to the Heater Begin Start-Up Before Operating the Heater Operation and MaintenancePre-Start-Up Checks Electrical ChecksEND View Check Gas Rate Pressure SwitchTurning Off the Heater External ControlsUser Instructions User InstructionsHeater Operation Lighting Instructions 11.4.1 To Turn On HeaterSimple Troubleshooting Burner Faults Simple TroubleshootingTo Turn Heater Off Servicing Vicinity of the Heater Maintenance ChecklistVehicles and Other ObjectsGas Line and Shut-off When installed DuctworkValves Burner ObservationTroubleshooting 13.1 General Conduct start-up procedure as shown on Page 23, Section Troubleshooting For Automatic Ignition Burner SystemsTroubleshooting for Flame Supervision System Troubleshooting for Flue Blower Troubleshooting for Gas ValvesBurner Components Replacement PartsBurner Injectors Burner CompartmentIgnition Electrode and Flame Probe Top, remove the blower and mounting plate as above Flue Blower Vertical InstallationIgnition Control Limit Switches Removal and ReplacementTOP View Specifications 15.1 Dimension DataTechnical Data Table General Technical Data TablePage Roberts Gordon will not PAY for Warranty is Void ifRoberts-Gordon Limitations on Authority RepresentativesPage Owner Warranty Registration Card Page Page Clearances to Combustibles