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UBX-UBZ-UDX-UDZ-IOM (07-23) 1034344-K
MAINTENANCE........................................................................... 33
Service Checklist......................................................................... 33
Maintenance Procedures .................................................................. 33
Burner Maintenance .................................................................... 33
Burner Orifice Maintenance .............................................................. 36
Heat Exchanger Maintenance ............................................................ 36
Ignition System Maintenance ............................................................. 36
Maintenance of Fan Motor, Fan Blades, and Fan Guard ........................................ 36
Venter Motor and Wheel Assembly Maintenance ............................................. 38
Combination Gas Valve Maintenance ...................................................... 39
Pressure Switch Maintenance ............................................................ 39
High Temperature Limit Control Maintenance ................................................ 39
Interlock Door Switch Maintenance (Models UBZ and UDZ Only)................................. 39
Flame Rollout Switch Maintenance (Models UDX and UDZ Unit Sizes 030–125 Only)................. 40
Transformer Maintenance ............................................................... 40
Disconnect Switch Replacement (Models UBZ and UDZ Only)................................... 40
Vent or Vent/Combustion Air System Maintenance ............................................ 40
TROUBLESHOOTING...................................................................... 40
General Troubleshooting................................................................... 40
Unit Troubleshooting Using DSI Control Module................................................. 42
INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER) .................................. 44
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.
References
Both this installation/operation manual and the appropriate venting instructions are shipped with the heater. Verify that
the literature is correct for the heater being installed. If either manual is missing or incorrect, contact your Distributor
before beginning installation.
Table 1. Related Technical Manuals Available from Factory Distributor
Type Form
PN*
Replacement parts UBX-UBZ-UDX-UDZ-RPL 1034346
Venting instructions**
UBX-UDX-VENTING 1034631
UBZ-UDZ-VENTING 1034632
Vertical louver kit installation UBX-UBZ-UDX-UDZ-UEZ-CD1 1036173
Downturn nozzle kit installation UBX-UBZ-UDX-UDZ-UEZ-CD2,3,4,5 1036421
Duct flange kit installation UBX-UBZ-CD9 1036171
Blower inlet and belt guard kit installation UBX-UBZ-CD10-CD12 1042292
Polytube adapter kit installation UBX-UBZ-CD11 1036422
Ceiling suspension kit installation UDX-UDZ-CK22 1037006
Gas conversion kit installation UBX-UBZ-UDX-UDZ-GC 1034364
Relay kit for multiple unit control OPT-CL31,32 1042699
Heat exchanger gasket kit installation UBX-UBZ-UDX-UDZ-HX 1037154
Stepdown transformer kit installation OPT-CG1-CG2-CG4 201244
*Also available at www.reznorhvac.com.
**BOTH this installation manual and the correct venting instructions are REQUIRED for the installation of this unit heater.
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