P/N 111101NA 09/13 Rev. JWARNINGFOR YOUR SAFETYIf you smell gas: 1. Open windows. 2. DO NOT try to light any appliance. 3. DO NOT use electrical
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL2 of 61Figure 1: UHA[T][X][S]150 - 250 Label Placement*For separated combustion unit
SECTION 1: HEATER SAFETY 3 of 61Figure 2: UHA[X][S]300 - 400 Label Placement*For separated combustion units only.Description Part NumberLogo Label 910
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL4 of 61SECTION 2: INSTALLER RESPONSIBILITYThe installer is responsible for the follo
SECTION 3: CRITICAL CONSIDERATIONS 5 of 61SECTION 3: CRITICAL CONSIDERATIONS3.1 Basic InformationUHA[T][X][S] heaters have automatic ignition burners
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL6 of 61SECTION 4: CLEARANCES TO COMBUSTIBLES4.1 Required Clearances to CombustiblesW
SECTION 4: CLEARANCES TO COMBUSTIBLES 7 of 61Figure 3: Installation Clearances and Clearances to Combustibles6"(15 cm)31"**(79 cm)3"(8
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL8 of 61SECTION 5: NATIONAL STANDARDS AND APPLICABLE CODES5.1 Gas CodesThe type of ga
5.6 High AltitudeThese heaters are approved (without modifications) for installations up to 2000' (610 m) in US and Canada. Heaters installed abo
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL10 of 61SECTION 6: HEATER INSTALLATION 6.1 General Heaters are designed for installa
SECTION 7: VENTING 11 of 61SECTION 7: VENTINGWARNINGCarbon Monoxide HazardHeaters may be installed vented or unvented.Vented heaters must be vented ou
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL12 of 617.2.1 Standard Vented Heaters (Models UHA[T][X] 150-250 and Models UHA[X] 3
SECTION 7: VENTING 13 of 617.8 Replacing an Existing Heater in a Venting SystemWhen replacing an existing heater in a venting system, the venting syst
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL14 of 61Figure 6: Standard Vented Heater - Vertical and Horizontal Vent TerminationV
SECTION 7: VENTING 15 of 61Figure 7: Standard Vented Heater - Common Vertical Vent TerminationRoof2'(.6 m)MinimumType "B" vent cap (7&
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL16 of 61Figure 8: Separated Combustion Heater - Vertical and Horizontal Vent Termina
SECTION 7: VENTING 17 of 61Figure 10: Concentric Vertical and Horizontal Vent TerminationVent**Air Intake*ConcentricVent BoxVerticalOption10' (3
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL18 of 61SECTION 8: AIR SUPPLYWARNINGExplosion HazardEquipment must have access to un
SECTION 9: GAS PIPING 19 of 61SECTION 9: GAS PIPINGWARNINGFire HazardConnect gas supply according to Figure 11.Do not use gas supply pipe and electric
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL20 of 61Figure 11: Gas ConnectionGas Shut-off ValveDrip LegCapUnionConnectionOption
SECTION 10: WIRING 21 of 61SECTION 10: WIRINGDANGERElectrical Shock HazardDisconnect electric before service.More than one disconnect switch may be re
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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL22 of 6110.2 Low Voltage Thermostat with One Heater for Models UHA[T][X][S] 150-250T
SECTION 10: WIRING 23 of 6110.4 Low Voltage Thermostat with Multiple Heaters (Models UHA[T][X][S]150 - 250)NLGnd.NLGnd.LNGnd.120V-60 HzNOTE: If both t
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL24 of 6110.5 Low Voltage Thermostat with Multiple Heaters (Models UHA[X][S]300 - 400
SECTION 10: WIRING 25 of 6110.6 UHA[X][S] Series Internal Wiring Diagram for Single Stage Gas ValvesNOTE:For field wiring into service junction box, o
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL26 of 6110.7 UHA[X][S] Series Ladder Wiring Diagram for Single Stage Gas ValvesNOTE:
SECTION 10: WIRING 27 of 6110.8 UHA[T][X][S] Series Internal Wiring Diagram for Two Stage Gas Valves1W2HIGH/LOW CONTROLHIGHLOWCOMMONNOTE:For field wir
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL28 of 6110.9 UHA[T][X][S] Series Ladder Wiring Diagram for Two Stage Gas ValvesHIGHS
SECTION 10: WIRING 29 of 6110.10 Electrical Connection to the HeaterNote: Junction box is not provided with heater. Conduit can also be attached dire
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL30 of 61SECTION 11: OPERATION AND MAINTENANCECut/Pinch HazardWear protective gear du
SECTION 11: OPERATION AND MAINTENANCE 31 of 6111.2 Begin Start-Up 11.2.1 Before Operating the HeaterTo ensure that all the controls are in safe wor
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL32 of 61Figure 13: Single Stage Gas Valve for Models UHA[X][S] 150-400½PSI INCONOFFR
SECTION 11: OPERATION AND MAINTENANCE 33 of 6111.2.2 Start-Up the Gas Valve (All Gases)11.2.2.1 Check Burner Gas Pressure1. Remove the plug in the out
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL34 of 61SECTION 12: USER INSTRUCTIONSCut/Pinch HazardWear protective gear during ins
SECTION 13: SERVICING 35 of 61SECTION 13: SERVICINGCut/Pinch HazardWear protective gear during installation, operation and service.Edges are sharp.WAR
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL36 of 61Page 47, Section 15.3.1. Clean any deposits from the main burner which may h
SECTION 13: SERVICING 37 of 61Vent Pipe/Terminals Venting must be intact. Using a flashlight, look for obstructions, cracks on the pipe, gaps in the s
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL38 of 61Silicone Tubing Ensure tight, secure fit on all pressure fittings at pressur
SECTION 14: TROUBLESHOOTING 39 of 61SECTION 14: TROUBLESHOOTINGCut/Pinch HazardWear protective gear during installation, operation and service.Edges a
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL40 of 6114.1 General
SECTION 14: TROUBLESHOOTING 41 of 6114.2 Troubleshooting For Automatic Ignition Burner Systems For your safety and optimum heater performance, use onl
© 2013 Roberts-Gordon LLCAll rights reserved. No part of this work covered by the copyrights herein may be reproduced or copied in any form or by any
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL42 of 6114.3 Troubleshooting for Flame Supervision SystemNOTE: Minimum flame probe c
SECTION 14: TROUBLESHOOTING 43 of 6114.4 Troubleshooting for Gas ValvesValve faulty.Replace with one of correct type.Fault elsewhere.Correct pressure
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL44 of 61SECTION 15: REPLACEMENT PARTSCarbon Monoxide HazardWARNINGUse only genuine R
SECTION 15: REPLACEMENT PARTS 45 of 6115.2 Burner Compartment for Models UHA[T][X][S] 150-250FillerPanelBurnerAssemblySide View of Burner Compartment
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL46 of 6115.2.2 Remove 4 screws to remove manifold.Ensure gas tight fitting of inject
SECTION 15: REPLACEMENT PARTS 47 of 6115.3 Burner Compartment for Models UHA[X][S] 300-400Remove flexibleair duct from spigot Removeaccess plateRemove
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL48 of 6115.4 Ignition Electrode and Flame Probe for Models UHA[T][X][S] 150-250Descr
SECTION 15: REPLACEMENT PARTS 49 of 6115.5 Ignition Electrode and Flame Probe for Models UHA[X][S] 300-400InshotBurnersInshotBurnersBurner Compartment
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL50 of 6115.6 Heat Exchanger The heat exchanger consists of a four-pass design with 1
SECTION 15: REPLACEMENT PARTS 51 of 6115.8 Flue Blower for Models UHA[T][X][S] 150-175Rear PanelGasketMountingPlateFlue FanVent BoxRear PanelFlue FanV
15.12 Ignition Control ... 5415.13 Axial Fan/Guard/Motor Assembly... 5415.14
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL52 of 6115.9 Flue Blower for Models UHA[T][X][S] 200-300 Outlet Gasket(Inside of Rea
SECTION 15: REPLACEMENT PARTS 53 of 6115.10 Flue Blower for Models UHA[X][S] 350-400 Vent BoxOutletGasketFlue BlowerVent BoxscrewsFlueAdapterFlue Adap
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL54 of 6115.11 Pressure SwitchCarbon Monoxide HazardUse correct pressure switch speci
SECTION 15: REPLACEMENT PARTS 55 of 6115.13.1 Fan Removal and ReplacementWARNINGSevere Injury HazardTurn off gas and electrical supply before service.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL56 of 61SECTION 16: SPECIFICATIONS16.1 Dimension Data for Models UHA[T][X][S] 150-25
SECTION 16: SPECIFICATIONS 57 of 6116.2 General Technical Data TableModelUHA[T][X][S]150UHA[T][X][S]175UHA[T][X][S]200UHA[T][X][S]225UHA[T][X][S]250Fu
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL58 of 6116.4 Dimension Data for Models UHA[X][S] 300-400ABFGHHeater must be supporte
Model UHA[X][S]300 UHA[X][S]350 UHA[X][S]400A in (cm) 52.3 (132.8) 52.3 (132.8) 52.3 (132.8)B in (cm) 43.2 (109.7) 43.2 (109.7) 43.2 (109.7)C in (cm)
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL60 of 61
SECTION 17: THE ROBERTS GORDON® UHA-SERIES WARRANTY 61 of 61SECTION 17: THE ROBERTS GORDON® UHA-SERIES WARRANTYROBERTS-GORDON LLC WILL PAY FOR:Within
TABLE OF FIGURESFigure 1: UHA[T][X][S]150 - 250 Label Placement ...2Figure 2: UHA[X][S]300 - 400 Label Placement ...
SECTION 1: HEATER SAFETY 1 of 61SECTION 1: HEATER SAFETYYour Safety is Important to Us! This symbol is used throughout the manual to notify you of po
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