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I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0
TABLE OF CONTENTS—CONTINUED
ADJUSTMENTS........................................................................... 32
Pressure Switch Replacement .............................................................. 32
Measure and Adjust Manifold (Outlet) Gas Pressure ............................................. 33
Measure and Adjust Manifold Gas Pressure—Elevation ≤2,000 Feet (≤610 Meters) .................. 33
Measure and Adjust Manifold Gas Pressure—Elevation >2,000 Feet (>610 Meters) .................. 35
MAINTENANCE........................................................................... 37
Service Checklist......................................................................... 37
Maintenance Procedures .................................................................. 37
Burner Maintenance .................................................................... 37
Burner Orifice Maintenance .............................................................. 40
Heat Exchanger Maintenance ............................................................ 40
Ignition System Maintenance ............................................................. 40
Maintenance of Fan Motor, Fan Blades, and Fan Guard ........................................ 41
Venter Motor and Wheel Assembly Maintenance ............................................. 42
Operating Gas Valve Maintenance ........................................................ 43
Pressure Switch Maintenance ............................................................ 43
High Temperature Limit Control Maintenance ................................................ 43
Flame Rollout Switch Maintenance (Model UDZ Unit Sizes 030–125 Only) ......................... 44
Interlock Door Switch Maintenance (Models UBZ and UDZ Only)................................. 44
Transformer Maintenance ............................................................... 44
Disconnect Switch Replacement (Models UBZ and UDZ Only)................................... 44
Vent or Vent/Combustion Air System Maintenance ............................................ 44
TROUBLESHOOTING ...................................................................... 44
Unit Troubleshooting Using DSI Control Module................................................. 44
General Troubleshooting................................................................... 46
INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER)................................... 48
GENERAL INFORMATION
This unit heater has been tested for capacity and efficiency so as to provide many years of safe and dependable
comfort providing it is properly installed and maintained. With regular maintenance, this unit will operate satisfactorily
year after year. Abuse, improper use, and/or improper maintenance can shorten the life of the appliance and create
unsafe hazards.
To achieve optimum performance and minimize equipment failure, it is recommended that periodic maintenance
be performed on this unit. The ability to properly perform maintenance on this equipment requires certain tools and
mechanical skills.
This manual applies only to the models listed. Accessories referenced may not apply to all models.
Installation should be done by a qualified agency in accordance with these instructions. The qualified service agency
installing this heater is responsible for the installation.
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