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Roberts Gorden 200, 350, 150, 400, 250, 300, 225, 175 service manual Concentric Vent Box, 16 of

Models: 175 225 300 250 400 150 350 200

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Figure 10: Concentric Vent Box

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 9: Separated Combustion Heater - Vertical and Horizontal Vent Termination

12" (31 cm)
Minimum from air inlet to vent	12" (31 cm)
termination.	Minimum from roof to vent
	termination.

	Air Intake*	Vent**
	Air Intake*
	Vertical
	Option	Horizontal	12" (31 cm)
		Horizontal	12" (31 cm)
	90°	Option	Minimum from air inlet to vent
	90°		termination.
	Bend	Air Intake	termination.
	Bend	Air Intake
			Air Intake
			Termination
			Vent
			Termination
		Vent**	12" (31 cm)
			12" (31 cm)
			Minimum from wall
			to vent termination.

Model	**Vent Diameter	Part Number
UHA[X]S 150 - 400	4" (10 cm)	90502102
Model	*Air Intake Diameter	Part Number
UHA[X]S 150 - 250	4" (10 cm)	90502102
UHA[X]S 300 - 400	5" (13 cm)	90502105

Listed Thimble through
Combustible Wall	NOTE: Vent supports not shown

Figure 10: Concentric Vent Box

			of	4"	(10	cm)
		piece		4"	Model

	One

4" (10 cm) or		.Selkirk
4" (10 cm) or	“B”	vent
5" (13 cm)	“B”
5" (13 cm)

Seal joint between single wall

and Type B vent with silicone sealant.

Combustion Air
to Heater	Use 3 sheetmetal
Exhaust	screws equally
Exhaust	spaced around joint.

from Heater

4" (10 cm) Single Wall Vent Pipe (By Others)

type

			(6	cm)airspace
		1/4"	(6		others)
		1/4"	.(By
diameter,ui
		alent
	q	v
Vor	e
R

Toward

Outside

6" (15 cm) or 8" (20 cm) Single Wall Inlet Air Pipe

Concentric (By Others) Vent Box

Use 3 sheetmetal screws equally spaced around collar.

16 of 51

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Roberts Gorden 200, 350, 150, 400, 250, 300, 225, 175 service manual Concentric Vent Box, 16 of

Contents

Installation, Operation & Service Manual CombatUHA-Series Tubular Unit Heaters Standard Range Models UHAXS 150, 175, 200, 225 250, 300Page Gamme standard Modèles UHAXS 150, 175, 200, 225 250, 300, 350,Manuel d’installation, d’operation, et de service CombatPage 2012 Roberts-GordonLLC Printed in U.S.APage TABLE OF FIGURES Page SECTION 1: HEATER SAFETY 1.1 Manpower Requirements1.2 Safety Labels and Their Placement 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 ofSECTION 2: INSTALLER RESPONSIBILITY 2.1 Wall Tag2.2 Corrosive Chemicals Product Damage Hazard3.4 Minimum Required Installation Clearances 3.2 Manufactured Units3.5 Ventilation 3.6 Gas SupplyFire Hazard 4.2 Clearances To Combustibles5.1 Gas Codes 5.2 Aircraft Hangars5.3 Parking Structures and Repair Garages 5.4 Electrical5.6 High Altitude SECTION 6: HEATER INSTALLATION 6.1 General 6.2 SuspensionCrush Hazard Use 3/8 threaded rod minimum Figure 5 Suspension MethodsHeaters may be installed vented or unvented 7.2 Vent InstallationSECTION 7: VENTING Carbon Monoxide Hazard7.2.1Standard Vented Heaters Models UHAX 150 - 7.3 Unvented Operation7.4 Horizontal Venting 7.5 Vertical VentingMaximum Vent Lengths Table 7.7 Vent MaterialFigure 6: Vent and Roof Detail 14 of Vertical Option Bend Horizontal OptionModel Part NumberRequirements Heaters must be of the same BTU output15 of Figure 10: Concentric Vent Box 16 of17 of VerticalOption Horizontal8.1 Separated Combustion Installation 8.2 Unvented InstallationSECTION 8: AIR SUPPLY Explosion HazardGas can leak if piping is not installed properly SECTION 9: GAS PIPING9.1 Connections Explosion HazardDo not bend flexible gas connector Figure 12 Gas ConnectionProduct Damage Hazard SECTION 10: WIRING Disconnect electric before serviceDANGER Electrical Shock Hazard22 of ModelRelay Type Relay Part Number23 of ModelRelay Type 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 SECTION 11: OPERATION AND MAINTENANCE heater before servicebefore service during installation11.2 Begin Start-Up 11.2.1 Before Operating the Heateron Page 28, Figure Figure 13: Automatic Burner Control Sequence11.2.3 Pressure Switch Figure 14: Gas Valve for Models UHAXS 150 -Check Gas Rate 11.2.4 Turning Off the Heater11.2.5 External Controls 11.3 Complete the Start-Up11.3.1 Instruction to the User 12.3 Simple Troubleshooting 12.3.1 Simple Troubleshooting Burner FaultFigure 15: LED Diagnostic Codes SECTION 12: USER INSTRUCTIONS13.2 Burner Maintenance 13.3 Fan/Motor Assembly Maintenance13.4 Heat Exchanger Maintenance 13.5 Gas Valve Maintenance13.8 Maintenance Checklist 13.7 Venting and Air Intake PipeAnnual Fall Start-Up The Vicinity of the Heaterwhen installed Heat ExchangerSee Page 19, Section Gas Line and Shut-offSECTION 14: TROUBLESHOOTING heater before servicebefore 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 SECTION 15: REPLACEMENT PARTS Burner Components15.1 Gas Valve 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 15.9.1Fan Removal and Replacement 15.10 Limit Switches15.10.1 Removal and Replacement 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 WARRANTY IS VOID IF ROBERTS-GORDONLLC WILL PAY FORROBERTS-GORDONLLC WILL NOT PAY FOR U.S.APage Mail or Fax to OWNER WARRANTY REGISTRATION CARDAbout the Installer Purchased From if different than installerPage