2UBX-UBZ-UDX-UDZ-IOM (07-23) 1034344-K
TABLE OF CONTENTS
GENERAL INFORMATION 3 ...................................................................
References 3 ..............................................................................
Important Safety Information 4.................................................................
Warranty 4 ................................................................................
Model Configuration 4 .......................................................................
Certification 5..............................................................................
Installation Codes 5 .........................................................................
Heater Location 5...........................................................................
Heater Throw 6 ..........................................................................
Mounting Height Requirements 7 ............................................................
Hazards of Chlorine 7 .....................................................................
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Clearances 10 .............................................................................
Weights 11................................................................................
Combustion Air Requirements 11 ..............................................................
INSTALLATION 12...........................................................................
Unpacking and Inspection 12..................................................................
Pre-Installation Checklist 12...................................................................
Heater Suspension 13 .......................................................................
Suspension of Heater Using Option CK8 or CK10 Hanger Kit 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suspension of Heater Using Option CK22 Hanger Kit 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Suspension Using Field-Supplied Threaded Rods 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suspension of Heater with Downturn Nozzle 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vent Connections 15 ........................................................................
Piping Connections 15.......................................................................
Gas Supply Pressure 15...................................................................
Gas Supply Piping 16 .....................................................................
Supply Piping Connections 16 ..............................................................
Electrical Connections 17.....................................................................
CONTROLS 19..............................................................................
Pressure Switch 19 .........................................................................
High Temperature Limit Control 21 .............................................................
Flame Rollout Switch (UDX and UDZ Model Unit Sizes 030–125) 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interlock Door Switch (UBZ and UDZ Models) 21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combination Gas Valve 21....................................................................
Fan Motor 21 ..............................................................................
Venter Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Thermostat Options 22.......................................................................
Circuit Board (DSI Control Module) 22...........................................................
OPERATION 23 .............................................................................
Pre-Startup Checklist 23 .....................................................................
Startup 23.................................................................................
Operating Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Vent System Testing 27......................................................................
Post-Startup Checklist 28.....................................................................
ADJUSTMENTS 28...........................................................................
Pressure Switch Replacement 28 ..............................................................
Measure and Adjust Manifold (Outlet) Gas Pressure 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measure and Adjust Manifold Gas Pressure—Elevation 2,000 Feet ( 610 Meters) 29≤ ≤ ..................
Measure and Adjust Manifold Gas Pressure—Elevation >2,000 Feet (>610 Meters) 31 . . . . . . . . . . . . . . . . . .
