Reznor UDZ User Manual

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.

Reznor UDZ Specifications

General

Type	Unit Heater
Fuel Type	Natural Gas or Propane
Dimensions	Varies by model
Weight	Varies by model
Heat Output	Varies with model
Efficiency	Up to 83%
Control Type	Thermostat
Ventilation	Power Vented
Heating Capacity	30, 000 to 400, 000 BTU/hr

Summary

Safety and Hazard Warnings

Fire or Explosion Hazard

Critical safety warnings regarding fire and explosion risks.

What to Do If You Smell Gas

Emergency procedures for gas leaks, including evacuation and contacting authorities.

General Information

References

Lists related technical manuals and documentation for installation and operation.

Important Safety Information

Crucial safety warnings, their meanings, and their importance.

Installation Codes

Compliance requirements with national and local building and gas codes.

Unit Location

Guidance on selecting an appropriate and safe location for unit installation.

Heater Throw

Details air throw patterns and distances for optimal heat distribution.

Mounting Height Requirements

Specifies safe and effective minimum and recommended mounting heights.

Hazards of Chlorine

Warns about potential corrosion risks from chlorine vapors affecting the unit.

Dimensions

Refers to figures and tables for detailed unit dimensions.

Combustion Air Requirements

Details air needs for combustion and installation requirements.

Acoustical Considerations

Refers to sound level data for determining unit location based on acoustics.

Technical Data

Refers to tables listing unit technical data for various models.

Installation

Unpacking and Inspection

Procedures for safely unpacking the unit and checking for shipping damage.

Pre-Installation Checklist

Essential steps and checks before beginning the installation process.

Heater Suspension

Instructions and considerations for securely suspending the heater unit.

Piping Connections

Details on connecting gas supply lines, including pressure and testing.

Electrical Connections

Guidance on proper wiring, grounding, and connection of electrical components.

Controls

Pressure Switch

Explains the function and operation of the pressure-sensitive switch.

High Temperature Limit Control

Details the automatic-reset limit control that prevents overheating.

Flame Rollout Switch

Information on the manually-reset switch for detecting flame rollout.

Main Operating Gas Valve

Importance and function of the gas valve as a safety shutoff.

Thermostat Options

Guidance on thermostat installation and connection requirements.

Circuit Board (DSI Control Module)

Explanation of the control module, its display, and fault codes.

Operation

Startup Procedure

Step-by-step instructions for safely starting the heater unit.

Operating Sequences

Details the normal and abnormal operating sequences of the heater.

Vent System Testing

Procedures for testing the vent system's integrity and performance.

Adjustments

Measure and Adjust Manifold (Outlet) Gas Pressure

Instructions for measuring and adjusting gas pressure for optimal performance.

Maintenance

Service Checklist

A minimum annual checklist for servicing and maintaining the equipment.

Burner Maintenance

Procedures for inspecting and cleaning the burner assembly for optimal combustion.

Heat Exchanger Maintenance

Instructions for inspecting the heat exchanger for damage like cracks or holes.

Ignition System Maintenance

Maintenance for the ignition system, including fuse replacement and sensor cleaning.

Maintenance of Fan Motor, Fan Blades, and Fan Guard

Procedures for cleaning and inspecting the fan motor, blades, and guard.

Venter Motor and Wheel Assembly Maintenance

Steps for maintaining the venter motor and wheel assembly.

Operating Gas Valve Maintenance

Instructions for inspecting and testing the gas valve for proper shutoff.

Flame Rollout Switch Maintenance

How to address and reset the flame rollout switch.

Troubleshooting

Unit Troubleshooting Using DSI Control Module

How to use the DSI control module display for diagnosing issues.

General Troubleshooting

Common symptoms, probable causes, and remedies for unit malfunctions.