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GAS-FIRED UNIT HEATER INSTALLATION, OPERATION,
AND MAINTENANCE
• Failure to follow safety warnings exactly could result in serious injury, death, or property
damage.
• Improper installation, adjustment, alteration, service, or maintenance can cause serious injury,
death, or property damage.
• Installation and service must be performed by a qualified installer, service agency, or the
gas supplier.
• Be sure to read and understand the installation, operation, and service instructions in this
manual.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a phone remote from the building. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
MODELS UBXC AND UDXC
⚠ DANGER ⚠
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
Revision: UBXC-UDXC-IOM (02-24) 1042980-0
Supersedes: — (Original Version)
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Table of Contents
Troubleshooting
Related Manuals for Reznor UBXC-250
Summarization of Contents
REZNOR GAS-FIRED UNIT HEATER INSTALLATION, OPERATION, AND MAINTENANCE
DANGER FIRE OR EXPLOSION HAZARD
Critical safety warning regarding fire or explosion. Failure to follow warnings can cause severe injury or death.
Models UBXC and UDXC Overview
Introduction to the specific models covered in this manual, UBXC and UDXC.
GENERAL INFORMATION
Important Safety Information
Review all safety warnings, dangers, cautions, and notes for safe operation and installation.
Model and Configuration Details
Information on UBXC (blower-type) and UDXC (fan-type) models, including separated-combustion options.
Installation Code Compliance
Adherence to local building codes and national standards for proper installation.
Heater Location Guidelines
Recommendations for optimal heater placement for effective air circulation and heating.
Clearance Requirements
Minimum distances from heater to combustible materials for safe installation.
INSTALLATION PROCEDURES
Unit Unpacking and Inspection
Steps for safely unpacking the unit and checking for any shipping damage.
Pre-Installation Checklist
Essential checks and preparations before installing the heater.
Heater Suspension Methods
Guidelines for safely suspending the heater, including structural support verification.
Gas Piping and Connections
Requirements for gas supply pressure, piping, and connection details.
Vent System Installation
General requirements for vent connections, condensation mitigation, and support.
Vent Terminal Requirements
Specifications for proper termination of the vent pipe to the exterior.
ELECTRICAL AND CONTROL SYSTEMS
Supply Wiring Connection
Instructions for connecting the main electrical power supply to the heater.
Control Wiring and Thermostats
Guidelines for connecting thermostats and other control devices to the unit.
Key Control Components
Overview of critical controls like pressure switch, limit switch, and circuit board.
OPERATION AND STARTUP
Critical Safety Warnings
Essential safety instructions before operating the appliance, including gas leak procedures.
Pre-Startup Checklist
Essential checks to perform before initiating the first startup of the heater.
Heater Startup Procedure
Step-by-step instructions for safely starting up the heater.
Operating Sequences
Description of the heater's operational cycles and sequences under normal and fault conditions.
ADJUSTMENTS AND SETTINGS
Pressure Switch Replacement
Procedure for replacing the pressure switch, particularly for high-elevation installations.
Manifold Gas Pressure Adjustment
Instructions for measuring and adjusting gas pressure for optimal heater performance.
MAINTENANCE PROCEDURES
Annual Service Checklist
Key maintenance tasks to ensure the heater's longevity and satisfactory performance.
Burner Assembly Maintenance
Procedures for inspecting and cleaning the burner assembly and its components.
Heat Exchanger Inspection
Guidelines for inspecting the heat exchanger for cracks, holes, or debris.
Ignition System Servicing
Maintenance for the DSI control module, flame sensor, and ignitor assembly.
Fan Motor and Venter Assembly Maintenance
Cleaning and inspection procedures for the fan motor, blades, and venter wheel.
Gas Valve and Limit Controls
Maintenance for the combination gas valve and high-temperature limit control.
TROUBLESHOOTING GUIDE
General Troubleshooting Steps
Common problems and remedies for venter motor and burner operational issues.
DSI Control Module Diagnostics
Using DSI control module display codes to diagnose unit faults and failures.
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