Reznor UDXC - Page 3

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UBXC-UDXC-IOM (02-24) 1042980-0
TABLE OF CONTENTS—CONTINUED
CONTROLS ................................................................................37
Pressure Switch ............................................................................38
High Temperature Limit Switch ................................................................38
Venter Wheel and Motor Assembly .............................................................38
Flame Rollout Switch (Model UDXC, Unit Sizes 30–125) ............................................39
Combination Gas Valve ......................................................................39
Fan Motor (Model UDXC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Thermostat ................................................................................39
Circuit Board (DSI Control Module) .............................................................39
Multiple Heater Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
OPERATION ................................................................................40
Pre-Startup Checklist ........................................................................40
Startup ...................................................................................41
Operating Sequences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Vent System Testing ........................................................................44
Post-Startup Checklist .......................................................................45
ADJUSTMENTS .............................................................................45
Pressure Switch Replacement .................................................................45
Measure and Adjust Manifold (Outlet) Gas Pressure ................................................45
Measure and Adjust Manifold Gas Pressure—Elevation ≤2,000 Feet (≤610 Meters) ....................46
Measure and Adjust Manifold Gas Pressure—Elevation >2,000 Feet (>610 Meters) ....................47
MAINTENANCE .............................................................................50
Service Checklist ...........................................................................50
Maintenance Procedures .....................................................................50
Burner Maintenance ......................................................................50
Burner Orifice Maintenance ................................................................53
Heat Exchanger Maintenance ..............................................................53
Ignition System Maintenance ...............................................................53
Maintenance of Fan Motor, Fan Blades, and Fan Guard ..........................................53
Venter Wheel and Motor Assembly Maintenance ...............................................55
Combination Gas Valve Maintenance ........................................................56
Pressure Switch Maintenance ..............................................................56
High Temperature Limit Control Maintenance ..................................................56
Transformer Maintenance .................................................................56
Disconnect Switch Maintenance ............................................................56
Vent or Vent/Combustion Air System Maintenance ..............................................56
Flame Rollout Switch Maintenance (Model UDXC, Unit Sizes 30–125) ..............................57
TROUBLESHOOTING ........................................................................57
General Troubleshooting .....................................................................57
Unit Troubleshooting Using DSI Control Module ...................................................59
INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER) ....................................64