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Reznor UDX - User Manual

Reznor UDX
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Revision: I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0
UNIT HEATER INSTALLATION/OPERATION/MAINTENANCE
Supersedes: — (Original Version)
MODEL UBX: STANDARD POWER VENT BLOWER TYPE
MODEL UBZ: SEPARATED-COMBUSTION BLOWER TYPE
MODEL UDX: STANDARD POWER VENT FAN TYPE
MODEL UDZ: SEPARATED-COMBUSTION FAN TYPE
 ⚠ DANGER ⚠ 
FIRE OR EXPLOSION HAZARD
• 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.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
WHAT TO DO IF YOU SMELL GAS
• 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 neighbor’s phone. 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.

Table of Contents

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Questions and Answers

  • B
    brucejenniferJul 25, 2025
    How to troubleshoot a Reznor UDX venter motor that will not start?
    • P
      Paul ValdezJul 25, 2025
      If the venter motor on your Reznor Heater won't start, begin by ensuring the unit has power and checking the supply fuses or circuit breaker. Next, verify that the thermostat is turned up to supply 24V power to the integrated circuit board. Check the control transformer output. Inspect the integrated circuit board fuse and replace it if blown (3A, type ATC or ATO, 32VDC) after correcting the cause. Tighten connections at the circuit board and/or motor terminals to ensure power is reaching the venter motor. If these steps don't resolve the issue, the integrated circuit board or the venter motor itself may be defective and require replacement.
  • S
    Sherry RiceJul 30, 2025
    What causes the fan or venter motor to not run in my Reznor UDX Heater?
    • L
      Linda WaltersJul 30, 2025
      If the fan or venter motor on your Reznor Heater will not run, check the wiring and connections for any open circuits. If the wiring is intact, the integrated circuit board or the motor itself may be defective and require replacement.
  • K
    Kenneth WernerAug 10, 2025
    Why does my Reznor UDX Heater burner keep cycling ON and OFF?
    • B
      bwangAug 10, 2025
      If the burner in your Reznor Heater cycles on and off, the gas pressure might be too high or too low; ensure it's at 5–14 IN WC for natural gas or 11–14 IN WC for propane. Check that the burner and circuit board are properly grounded. If 24V power is available to the integrated circuit board and all other causes have been eliminated, replace the board. Make sure the unit is properly vented, removing any obstructions, and replace any faulty tubing to the pressure switch. Replace the pressure switch if it's faulty. Check that the flame sensor lead isn't grounded and that the sensor insulation or ceramic isn't cracked; replace if needed. If the polarity is incorrect, reverse the line volt leads to the integrated circuit board. Finally, replace the wire harness if a pin terminal is loose.
  • K
    Kerri VelasquezAug 15, 2025
    Why does the fan or venter motor cut out on overload in my Reznor UDX Heater?
    • J
      Jessica ParkerAug 15, 2025
      If your Reznor Heater's fan or venter motor cuts out on overload, ensure the electric supply voltage is correct. If the voltage supply is not the issue, the motor may be defective and require replacement. Poor airflow can also cause this issue, so clean the motor, fan, and fan guard.
  • G
    garzahaileyAug 19, 2025
    Why does the fan or venter motor turn ON and OFF while the burner is operating on my Reznor Heater?
    • T
      Timothy MooreSep 12, 2025
      If the fan or venter motor in your Reznor Heater turns on and off while the burner is operating, the motor overload device might be cycling. Check the motor load against the motor rating plate, and replace the motor if needed.
  • C
    Chelsea ChristensenNov 3, 2025
    What to do if my Reznor Heater burner will not light?
    • J
      jasmineariasNov 3, 2025
      To troubleshoot a Reznor Heater burner that won't light, start by opening the manual valve to ensure gas flow. If it's a new installation, bleed the gas line to remove any air. Check that the gas pressure is within the correct range: 5–14 IN WC for natural gas or 11–14 IN WC for propane. Inspect all wire connections for solidity and confirm 24V power is available to the transformer. Ensure the spark gap is 1/8 inch and replace any worn or grounded spark cables or cracked ceramic spark electrodes. Verify the integrated circuit board and the unit itself are properly grounded. If a lockout device is interrupting the control circuit, reset it at the thermostat or main power. Make sure the interlock door switch is closed, and the unit is properly vented with no obstructions. Replace any faulty ...

Summary

Reznor Unit Heater Installation, Operation, and Maintenance

General Information and Safety

Covers unit specifications, safety warnings, installation codes, and location guidelines.

Installation Procedures

Step-by-step guide for unpacking, suspending, connecting, and installing the unit.

Controls and Operation Sequences

Details on control components, startup procedures, and operating sequences.

Adjustments and Maintenance

Instructions for gas pressure adjustment, switch replacement, and routine servicing.

Troubleshooting Common Issues

Guides for diagnosing issues using DSI module and general troubleshooting.

Installation Record

Form for installers to document specific unit installation details and notes.

Reznor UDX Specifications

General IconGeneral
ModelUDX
CategoryHeater
Fuel TypeNatural Gas or Propane
Ignition SystemDirect Spark Ignition
InstallationHorizontal or Vertical
Heat Exchanger MaterialAluminized Steel
DimensionsVaries by model
WeightVaries by model
Heating Capacity30, 000 to 400, 000 BTU/hr
Efficiency83%
Vent TypeSeparated Combustion
Voltage115V
Control TypeThermostat
TypeGas-fired unit heater

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