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Reznor UDAP - User Manual

Reznor UDAP
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Form I-UDA, P/N 195673 R23, Page 1
Applies to: Model UDAP
and Model UDAS
Series Fan-Type
Unit Heaters
Form I-UDA (Version B.8)
Obsoletes I-UDA (Version B.7)

Installation / Operation
!
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in serious injury, death, or
property damage.
Be sure to read and understand the installation, operation, and service instructions in
this manual.
Improper installation, adjustment, alteration, service, or maintenance can cause
serious injury, death, or property damage.
— Do not store or use gasoline or other ammable 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 phone remote from the building. Follow
the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re department.
— Installation and service must be performed by a qualied installer, service agency,
or the gas supplier.

Table of Contents

Questions and Answers

  • R
    ryanweberJul 30, 2025
    What to do if the venter motor on my Reznor UDAP will not start?
    • L
      Lynn GayJul 30, 2025
      If the venter motor isn't starting, first, ensure the unit has power and check the supply fuses or circuit breaker. Verify that there's 24-volt power reaching the integrated circuit board by turning up the thermostat and checking the control transformer output. Inspect the integrated circuit board fuse and replace it if blown (use type ATC or ATO, 32VDC, 3A after correcting the cause). Tighten connections at the circuit board and/or motor terminals to ensure power is getting to the venter motor. If these steps don't work, the integrated circuit board or the venter motor itself may be defective and need replacement.
  • J
    Justin KingAug 8, 2025
    What causes a Reznor UDAP fan or venter motor to cut out on overload?
    • C
      Crystal RichAug 8, 2025
      If the fan or venter motor cuts out on overload, it could be due to a low or high voltage supply, which needs to be corrected. A defective motor can also cause this issue, requiring replacement. Poor airflow could be another reason; try cleaning the motor, fan, fan guard, filter, and coils.
  • R
    Rhonda LeeAug 12, 2025
    What causes a Reznor UDAP Heater fan or venter motor to turn on and off while the burner is operating?
    • T
      Tina KingAug 12, 2025
      This issue can occur if the motor overload device is cycling on and off. Check the motor load against the motor rating plate. If the load exceeds the rating, consider replacing the motor.
  • H
    Helen Campbell MDAug 16, 2025
    Why is there no heat when my Reznor Heater is operating?
    • F
      fvasquezAug 16, 2025
      Lack of heat while the heater is running could stem from a few reasons. The valve outlet pressure or orifice might be incorrect; check the valve outlet pressure against the rating plate for manifold pressure. It could also be cycling on a limit control, so check the air throughput. Finally, the thermostat's location or adjustment might be improper; consult the thermostat manufacturer's instructions.
  • A
    adamspaulAug 20, 2025
    What to do if the fan or venter motor will not run on my Reznor Heater?
    • C
      Christopher LewisAug 21, 2025
      If the fan or venter motor isn't running, first check the wiring and connections for any open circuits. If the wiring is intact, the integrated circuit board may be defective and need replacement. Alternatively, the motor or starter itself might be defective, requiring replacement.
  • R
    Robin JensenOct 25, 2025
    Why is my Reznor UDAP burner not lighting?
    • D
      Dawn WrightOct 25, 2025
      The burner might fail to light due to several reasons. It could be because the manual valve isn't open, so ensure it is. If it's a new installation, there might be air in the gas line, which needs to be bled. The gas pressure could also be too high or low; it should be 5" - 14" w.c. for natural gas or 11" - 14" w.c. for propane. Also, check for loose wire connections, transformer failure, incorrect spark gap (maintain at 1/8"), shorted spark cable or electrode, grounding issues with the burner or circuit board, a blown integrated circuit board fuse (replace with type ATC or ATO, 32VDC, 3A after correcting the cause), or a faulty integrated circuit board (replace if 24V is available and other causes are eliminated). Finally, a lockout device might be interrupting the control circuit, so res...
  • K
    Karen BarnesNov 2, 2025
    Why does my Reznor Heater burner cycle on and off?
    • J
      Justin HernandezNov 3, 2025
      The burner cycling on and off could be due to several factors. Check that the gas pressure is within the correct range: 5" - 14" w.c. for natural gas or 11" - 14" w.c. for propane. Ensure the integrated circuit board is properly grounded to both Terminal P1-9 and the furnace chassis. If 24 volts are available to the integrated circuit board and other causes have been ruled out, the board may be faulty and need replacement. Also, a combustion air proving switch that is not closing, ensure the unit is properly vented, remove obstructions from the vent, and replace faulty tubing to the pressure switch. Replace the combustion air proving switch if it is faulty. Check the flame sensor lead to ensure it's not grounded, that the insulation isn't damaged, and that the ceramic isn't cracked; replac...

Summary

1.0 General

1.2 General Installation Information

Details certification, installation requirements, and venting manual identification for UDAP/UDAS models.

4.0 Clearances and Dimensions

4.1 Clearances

4.2 Dimensions

6.0 Mechanical

6.1 Gas Piping and Pressures

Covers gas supply line sizing, connections, and pressure requirements for safe operation.

6.2 Combustion Air - Models UDAP and UDAP-CV

7.0 Electrical Supply and Wiring

7.1 General

7.2 Supply Wiring

8.0 Controls and Operation

8.1 Thermostat

8.3 Ignition System

LED lights

9.0 Commissioning and Startup

9.1 Check the installation prior to startup

A checklist of essential pre-startup checks for safe and proper installation.

9.2 Heater Startup

Step-by-step guide for safely starting the heater for the first time.

10.0 Maintenance and Service

10.1 Maintenance Schedule

Outlines annual procedures for cleaning and inspecting the heater for optimal performance.

10.3 Troubleshooting

Provides a flowchart and table to diagnose and resolve common operational problems.

Reznor UDAP Specifications

General IconGeneral
ModelUDAP
TypeUnit Heater
Fuel TypeNatural Gas or Propane
Efficiency80%
Ignition SystemDirect Spark Ignition
Vent TypePower Vented
ThermostatOptional
DimensionsVaries by model
WeightVaries by model
InstallationHorizontal or Vertical
BTU Range30, 000 - 400, 000 BTU/hr
Voltage115V

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