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TABLE OF CONTENTS-CONTINUED <br /> ADJUSTMENTS. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . 32 <br /> Pressure Switch Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 <br /> Measure and Adjust Manifold (Outlet) Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 <br /> Measure and Adjust Manifold Gas Pressure—Elevation _<2,000 Feet(<_6110 Meters) . . . . . . . . . . . . . . . . . . 33 <br /> Measure and Adjust Manifold Gas Pressure—Elevation >2,000 Feet(>610 Meters) . . . . . . . . . . . . . . . . . . 35 <br /> MAINTENANCE.. . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 <br /> ServiceChecklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 <br /> Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 <br /> Burner Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 <br /> Burner Orifice Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 <br /> Heat Exchanger Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 <br /> Ignition System Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 <br /> Maintenance of Fan Motor, Fan Blades, and Fan Guard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 <br /> Venter Motor and Wheel Assembly Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 <br /> Operating Gas Valve Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 <br /> Pressure Switch Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 <br /> High Temperature Limit Control Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 <br /> Flame Rollout Switch Maintenance (Model UDZ Unit Sizes 030-125 Only) . . . . . . . . . . . . . . . . . . . . . . . . . 44 <br /> Interlock Door Switch Maintenance (Models UBZ and UDZ Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 <br /> Transformer Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 <br /> Disconnect Switch Replacement (Models UBZ and UDZ Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 <br /> Vent or Vent/Combustion Air System Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 <br /> TROUBLESHOOTING.. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 <br /> Unit Troubleshooting Using DSI Control Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 <br /> General Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 <br /> INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER). . .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 48 <br /> GENERAL INFORMATION <br /> This unit heater has been tested for capacity and efficiency so as to provide many years of safe and dependable <br /> comfort providing it is properly installed and maintained.With regular maintenance,this unit will operate satisfactorily <br /> year after year. Abuse, improper use,and/or improper maintenance can shorten the life of the appliance and create <br /> unsafe hazards. <br /> To achieve optimum performance and minimize equipment failure, it is recommended that periodic maintenance <br /> be performed on this unit.The ability to properly perform maintenance on this equipment requires certain tools and <br /> mechanical skills. <br /> This manual applies only to the models listed. Accessories referenced may not apply to all models. <br /> Installation should be done by a qualified agency in accordance with these instructions.The qualified service agency <br /> installing this heater is responsible for the installation. <br /> 1-UBX-UBZ-UDX-UDZ(04-21)1034344-0 3 <br />