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Reznor UBZ - User Manual

Reznor UBZ
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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

  • D
    Darrell HoffmanAug 10, 2025
    How to troubleshoot a Reznor Heater venter motor that will not start?
    • J
      Jimmy HarrisonAug 10, 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.
  • A
    Alexander MurphyAug 16, 2025
    What causes the fan or venter motor to not run in my Reznor UBZ?
    • W
      Wanda SheppardAug 16, 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.
  • R
    Rachel WilliamsAug 25, 2025
    Why does my Reznor Heater burner keep cycling ON and OFF?
    • N
      Natalie WrightAug 26, 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.
  • A
    Angela RodriguezAug 30, 2025
    Why does the fan or venter motor cut out on overload in my Reznor UBZ Heater?
    • M
      Mrs. Melissa HansonAug 30, 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.
  • J
    Julie SmithSep 4, 2025
    Why does the fan or venter motor turn ON and OFF while the burner is operating on my Reznor UBZ Heater?
    • S
      Stefanie ZavalaSep 4, 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.
  • J
    jeffreysanchezNov 19, 2025
    What to do if my Reznor Heater burner will not light?
    • M
      Maria LewisNov 19, 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 ...

Reznor UBZ Specifications

General IconGeneral
TypeUnit Heater
Fuel TypeNatural Gas or Propane
Thermal Efficiency80%
DimensionsVaries by model
WeightVaries by model
IgnitionDirect Spark
MountingCeiling
Gas Connection Size (NPT)1/2" - 1"

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