Table of Contents
Advertisement
Quick Links
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)
Advertisement
Table of Contents
Troubleshooting
Related Manuals for Reznor UBXC-300
Summarization of Contents
GENERAL INFORMATION
Safety Warnings
DANGER, WARNING, and CAUTION statements detailing hazardous situations and potential injuries.
Unit Specifications
Details on warranty, model configuration, certifications, and installation code requirements.
Location, Clearances, and Throw Distances
Guidance on heater placement, clearances, and throw patterns.
Heater Throw Distances Data
Comprehensive data on throw patterns and distances for UBXC and UDXC models.
Mounting Height and Chlorine Hazards
Recommendations for mounting height and awareness of chlorine vapor hazards.
Dimensions
UBXC and UDXC Dimensions
Diagrams illustrating dimensions and connection points for UBXC and UDXC models.
Dimension Table
Detailed dimensional data for UBXC and UDXC models across various unit sizes.
Weights
Weight Specifications
Table showing weight specifications for UBXC and UDXC models by unit size.
Combustion Air Requirements
Combustion Air Needs
Warnings and requirements for providing adequate combustion air for unit operation.
INSTALLATION
Unpacking and Pre-Installation Checklist
Instructions for inspecting the unit upon unpacking and key checks before installation.
Heater Suspension
Warnings and cautions regarding safe and proper suspension of the heater.
Suspension Methods
Instructions for using hanger kits or field-supplied rods for heater suspension.
Gas Piping and Connections
Details on gas supply piping, connections, safety warnings, and pressure.
Vent System Requirements
General requirements for vent system installation, code compliance, and condensation mitigation.
Vent System Support and Sealing
Guidelines for supporting vent pipes and sealing vent system joints.
Vent Terminal Requirements
Safety requirements and guidelines for vent pipe termination locations and clearances.
Venting Installation Types
Flowchart and instructions for Category III and Category I venting installations.
Electrical Connections
Safety warnings and guidelines for making all electrical wiring and connections.
Supply Wiring Connection
Instructions for connecting the supply voltage and current to the heater.
CONTROLS
Control Components Overview
Identifies key controls like thermostat, circuit board, gas valve, and fan motor.
Pressure & Limit Switches
Explanation of pressure switch function and high temperature limit switch operation.
Venter Motor & Gas Valve
Information on the venter motor's role and the combination gas valve as a safety shutoff.
Ignition System Controls
Details on flame rollout switch, thermostat, and DSI control module for ignition.
Multiple Heater Control
Details on optional controls for managing multiple heaters with a single thermostat.
OPERATION
Pre-Operation Safety & Checklist
Critical safety warnings before operating and a list of essential pre-startup checks.
Startup Procedure
Step-by-step instructions for starting up the heater, including gas valve operation.
Operating Sequences & Fault Modes
Tables detailing normal and abnormal heat cycle operating sequences and fault modes.
Vent System Testing
Procedure for testing the vent system to ensure safe operation.
ADJUSTMENTS
Post-Startup Checks & Pressure Switch Replacement
Checks after startup and procedure for replacing the pressure switch.
Gas Pressure Adjustment
Instructions for measuring and adjusting gas pressure at sea level and high elevations.
Elevation Capacity Data
Table providing input and capacity values based on installation elevation.
MAINTENANCE
Service Checklist
Annual maintenance checklist for inspecting and cleaning key components.
Burner & Heat Exchanger Maintenance
Detailed steps for cleaning and inspecting burner assembly and heat exchanger.
Ignition System Maintenance
Maintenance for the DSI control module, fuses, flame sensor, and ignitor.
Fan Motor & Venter Maintenance
Servicing fan motor, blades, guard, and venter wheel/motor assembly.
Gas Valve & Pressure Switch Maintenance
Procedures for inspecting and testing gas valve and replacing pressure switch.
Limit Control, Transformer & Disconnect Maintenance
Procedures for replacing limit controls, transformers, and disconnect switches.
Vent System Maintenance
Annual inspection and cleaning of the complete vent and combustion air system.
TROUBLESHOOTING
General Troubleshooting Guide
Table listing common symptoms, probable causes, and remedies for general issues.
DSI Control Module Troubleshooting
Using DSI control module display codes and flowchart for diagnosing unit operation.
INSTALLATION RECORD
Installer Information
Section for recording installer, distributor, and installation date details.
Need help?
Do you have a question about the UBXC-300 and is the answer not in the manual?
Questions and answers