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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-75
Summarization of Contents
General Information
Important Safety Information
Crucial safety warnings and definitions for operating the unit.
Heater Location
Guidelines for optimal placement of the heater for heating efficiency.
Clearances
Minimum required distances from the heater to combustible materials.
Heater Throw Distances
Data on air throw patterns for various unit sizes and angles.
Mounting Height Requirements
Recommended minimum mounting height for suspended heaters.
Hazards of Chlorine
Information on corrosion hazards from chlorine vapors.
Dimensions
Diagrams and labels for unit dimensions.
Weights
Specifications for unit weights across different models and sizes.
Combustion Air Requirements
Guidelines for providing adequate combustion air for safe operation.
Installation
Pre-Installation Checklist
Steps to verify compatibility and gather necessary items before installation.
Heater Suspension
Methods and safety precautions for suspending the heater.
Piping Connections
Instructions for connecting gas supply lines to the unit.
Gas Supply Pressure
Requirements for gas supply pressure for proper operation.
General Requirements for Vent Connections
Guidelines for connecting the vent system to the unit.
Condensation Mitigation
Methods to prevent condensate formation in the vent system.
Vent System Support Requirements
Guidelines for properly supporting vent pipes.
Vent System Sealing
Procedures for sealing vent system joints to ensure integrity.
Vent Terminal Requirements
Safety and clearance specifications for vent termination points.
Vent Connections for Standard Units
Flowchart and instructions for selecting vent connection methods.
Installation Methods
Decision points for choosing the correct vent installation method.
Venter (Flue) Outlet Diameter
Information on selecting the correct venter outlet diameter.
Category III Venting
Specific requirements for Category III venting systems.
Category III Commercial/Industrial Installations
Installation procedures for Category III vents in commercial/industrial settings.
Category III Residential Installations (Model UDXC)
Installation procedures for Category III vents in residential settings.
Category I Venting
Guidelines for Category I venting installations.
Category I Commercial/Industrial or Residential (Model UDXC) Installations with Vertical Dedicated Vent
Procedures for vertical Category I dedicated venting.
Category I Residential Installations with Common Vent (Model UDXC)
Procedures for common venting with Category I appliances.
Electrical Connections
Safety and wiring guidelines for electrical connections.
Supply Wiring Connection
How to connect the main power supply to the heater.
Control Connections
Wiring instructions for thermostats and other control devices.
Controls
Pressure Switch
Function and settings of the pressure switch.
High Temperature Limit Switch
Safety function of the high-temperature limit switch.
Flame Rollout Switch (Model UDXC, Unit Sizes 30–125)
Safety function of the flame rollout switch.
Combination Gas Valve
Description of the primary safety shutoff valve.
Thermostat
Requirements and connection for thermostat control.
Circuit Board (DSI Control Module)
Function and role of the DSI control module.
Operation
Pre-Startup Checklist
Essential checks before initial heater startup.
Startup
Step-by-step instructions for starting the heater.
Operating Sequences
Description of normal and abnormal heat cycle operation sequences.
Vent System Testing
Vent System Testing
Procedures for testing the venting system's performance.
Adjustments
Pressure Switch Replacement
Steps for replacing the pressure switch, especially for high elevations.
Measure and Adjust Manifold (Outlet) Gas Pressure
How to measure and adjust gas pressure for optimal performance.
Required Manifold (Outlet) Gas Pressure
Table detailing gas pressure requirements based on elevation.
Maintenance
Service Checklist
Annual inspection items for ensuring proper unit condition.
Burner Maintenance
Procedures for cleaning and inspecting the burner assembly.
Burner Orifice Maintenance
When and how to replace the burner orifice.
Heat Exchanger Maintenance
Inspection and replacement procedures for the heat exchanger.
Ignition System Maintenance
Steps for maintaining the ignition system components.
Venter Wheel and Motor Assembly Maintenance
Procedures for cleaning and replacing the venter assembly.
Combination Gas Valve Maintenance
How to inspect and test the combination gas valve.
Pressure Switch Maintenance
Guidelines for maintaining or replacing the pressure switch.
Troubleshooting
General Troubleshooting
A table listing common symptoms, probable causes, and remedies.
Unit Troubleshooting Using DSI Control Module
Methods for troubleshooting using the DSI control module's display.
DSI Control Module Troubleshooting Flowchart
A flowchart to diagnose issues based on control module signals.
Installation Record
Installation Record
A form for recording installation details for service and reference.
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