Reznor UBX Installation Operation & Maintenance
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Reznor UBX Installation Operation & Maintenance

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UNIT HEATER INSTALLATION/OPERATION/MAINTENANCE
MODEL UBX: STANDARD POWER VENT BLOWER TYPE
MODEL UBZ: SEPARATED-COMBUSTION BLOWER TYPE
MODEL UDZ: SEPARATED-COMBUSTION FAN TYPE
• 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.
• 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.
MODEL UDX: STANDARD POWER VENT FAN TYPE
 ⚠ DANGER ⚠ 
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
Revision: I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0
Supersedes: — (Original Version)

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Questions and answers

Raymond
February 25, 2025

Were is the presure locade

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1 comments:
Mr. Anderson
February 25, 2025

The pressure switch on a Reznor UBX unit is located in the venter housing. It is a single-pole, normally open device that closes when a negative pressure is sensed in the venter housing.

This answer is automatically generated

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MARSHA SCHADDELEE
March 5, 2025

WHERE DO I FIND PRODICT REGISTRATION FOR REZNOR UNIT HEAT

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Summary of Contents for Reznor UBX

  • Page 1 Revision: I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0 Supersedes: — (Original Version) UNIT HEATER INSTALLATION/OPERATION/MAINTENANCE 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 •...

  • Page 2: Table Of Contents

    Post-Startup Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 3: General Information

    This manual applies only to the models listed . Accessories referenced may not apply to all models . Installation should be done by a qualified agency in accordance with these instructions . The qualified service agency installing this heater is responsible for the installation . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 4: References

    • All models and unit sizes are available for use with either natural or propane gas . The type of gas, the gas input rate, and the electrical supply requirement are shown on the heater rating plate . Check the rating plate to verify that the heater is appropriate for the installation site . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 5: Warranty

    . The throw pattern changes with the addition of optional vertical louvers and/or downturn nozzles . Z = Distance at which air velocity drops below 50 feet (15.2 meters) per minute Figure 1. Heater Throw Patterns (Refer to Table 2 Table I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 6 6 .4 9 .4 27 .4 −38° 7 .0 10 .7 30 .8 −33° 5 .5 6 .1 9 .1 25 .9 −43° 7 .0 10 .7 26 .9 −37° Distance in meters (see Figure 1) . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 7: Mounting Height Requirements

    . Chlorine is heavier than air . Keep these facts in mind when determining installation location of the heater in relation to building exhaust systems . Dimensions Figure 2 Figure 3 Table 4 Table Unit dimensions are shown in and listed in I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 8 RIGHT SIDE VIEW VIEW (ACCESS PANEL) BELT DRIVE BLOWER WITH BLOWER BACK ON THE CABINET DIRECT DRIVE - SIZES 150-400 BLOWER WITH BLOWER BACK ON THE CABINET -SIZES 100-125 Figure 2. Dimensions—Models UBX and UBZ (Refer to Table I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 9 Table 4. Dimensions—Models UBX and UBZ Dimension (See Figure Unit Size Inches (±1/16) (mm (±2)) 030, 13-3/4 13-13/16 17-3/16 40-3/32 25-17/32 17-3/8 1-9/16 22-1/2 6-15/32 3-1/2 2-21/32 5-31/32 3-5/16 (686) (349) (351) (254) (437) (1018) (649) (441) (40) (572) (164)

  • Page 10: Clearances

    NOTE: For unit shipping weight, contact an authorized Factory Distributor. Before suspending the heater, ensure that the supporting structure to be used has sufficient load-carrying capacity Table 7) of the unit . to support the weight (refer to I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 11: Combustion Air Requirements

    Table • UBX and UDX models must be supplied with the air that enters into the combustion process and is then vented to the outdoors . Sufficient air must enter the equipment location to replace that which is exhausted through the heater vent system .

  • Page 12: Acoustical Considerations

    . Technical Data Table 9, Table 10, Table 11, Table 12 list unit technical data . Table 9. Technical Data for UBX and UBZ Models (Unit Sizes 030–125) Unit Size Unit of Parameter Measurement 30,000...
  • Page 13 Table 10. Technical Data for UBX and UBZ Models (Unit Sizes 150–400) Unit Size Unit of Parameter Measurement 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000 BTUh Input heating capacity 43 .9 51 .2 58 .6 65 .9 73 .2 87 .8...
  • Page 14 Smaller and/or larger vent and combustion air pipe diameters may be permissible . Refer to appropriate venting instructions listed in Table MOCP = 2 .25 × (largest motor FLA) + smallest motor FLA . Answer is rounded to the next lower standard circuit breaker size . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 15 Smaller and/or larger vent and combustion air pipe diameters may be permissible . Refer to appropriate venting instructions listed in Table MOCP = 2 .25 × (largest motor FLA) + smallest motor FLA . Answer is rounded to the next lower standard circuit breaker size . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 16: Installation

    Adapts 3/8-inch hangers for two-point suspension from 1-inch threaded pipe Hanger kit CK10 Adapts 3/8-inch hangers for four-point suspension from 1-inch threaded pipe CK22 Angle brackets for Low ceiling mounting (does not include hanger rods) High-elevation conversion kit DJ20 For installations at elevations >6000 feet I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 17: Heater Suspension

    . The heater may be suspended using either 3/8-inch threaded rods or a hanger kit option package . • On heater models UBX and UDX, shipped-separate option packages—that should be installed before the heater is suspended—include vertical louvers, high-elevation kit, multiple heater control, sensor for DDC control, and/ or stepdown transformer .

  • Page 18: Suspension Of Heater With Downturn Nozzle

    Option CK22, is available for unit sizes 030–125 . This option allows the heater to be installed one inch from the ceiling without hanger rods as shown in Figure 7 . Refer to the installation instructions provided with the kit . Figure 7. Option CK22 Hanger Kit I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 19: Heater Suspension Using Field-Supplied Threaded Rods

    • Variables for sizing gas supply lines are listed in Table 14 . When sizing supply lines, consider possibilities of future expansion and increased requirements . Refer to National Fuel Gas Code for additional information on line sizing . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 20: Supply Piping Connections

    • Leak-test all connections by brushing on a leak-detecting solution . Bleed trapped air from gas lines as needed . • The gas connection is made at the pipe nipple that extends outside the cabinet, as shown in Figure 9 . Gas Table 15 . connection sizes are listed in Figure 9. Gas Connections I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 21: Electrical Connections

    • The supply wiring enters at the rear of the heater, as shown in Figure 10 . For UBX and UDX models, the supply wiring connects directly to leads on the integrated circuit board . For UBZ and UDZ models, the supply wiring connects to leads located inside a sealed electrical box .
  • Page 22 . It is advisable to check the electrical supply ensure that the black wire is the hot wire and that the white wire is the neutral wire . The hot wire must be connected to terminal L1 on the circuit board . Figure 11. Circuit Board (DSI Control Module) I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 23: Controls

    . • On UBX and UDX models, the pressure switch is a single-pole/normally-open device that closes when a negative pressure is sensed in the venter housing . On UDZ and UDZ models, the pressure switch senses the differential pressure between the negative pressure in the venter housing and the pressure in the cabinet .
  • Page 24 . The main burner will remain off until the system has cooled and/or the flue system resistance is reduced . • Pressure switch settings are listed in Table 16 . Table 16. Pressure Switch Settings UBX and UDX Models Negative Pressure (IN WC) Unit Size Label Color Switch PN Startup Cold...

  • Page 25: High Temperature Limit Control

    Figure 11) . Refer to the Circuit Board (DSI Control Module) airflow . Operation is controlled by the circuit board (see section for details . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 26: Thermostat Options

    . The module’s seven-segment display is visible through a viewport on UBZ and UDZ models . To view the seven-segment display on UBX and UDX models, the door panel requires removal . In addition, there is a status LED on the bottom of the heater . Its status indications are off (heater is not powered or control board fault), steady on (heater is on with no faults), or flashing (heater is on with fault(s)) .

  • Page 27: Operation

    1 . Set thermostat at lowest setting . 2 . Turn OFF all electric power to appliance . NOTE: This appliance is equipped with an ignition device that automatically lights the burner. Do not try to light the burner by hand. I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 28 . If service is to be performed, turn off all electric power to appliance . c . Open the access door . d . Turn gas control switch to OFF or turn knob clockwise to OFF (do not force) . e . Close access door . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 29: Operating Sequences

    Control deenergizes gas valve and proceeds to steps 6 and 7 removed 6 . Post-purge Venter motor remains on for 45-second post-purge period Thermostat is satisfied 7 . Fan/blower Fan/blower motor is deenergized after selected fan/blower OFF delay OFF delay I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 30 Fan remains energized as long as call for fan remains without call for heat Fan/blower is deenergized Thermostat calls for heat (W) during continuous fan operation Call for fan is ignored during lockout The limit switch is ignored unless a call for heat is present (terminal W energized) . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 31: Vent System Testing

    . 9 . If improper venting is observed during above tests, vent system must be corrected . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 32: Post-Startup Checklist

    NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY OF COMBUSTION AIR TO ANY HEATER. Heater models UBX and UDX installed in a confined space must be supplied with air for combustion as required by code and the requirements listed in this manual. MAINTAIN THE VENT OR VENT/COMBUSTN AIR SYSTEM IN STRUCTURALLY SOUND AND PROPER OPERATING CONDITION.

  • Page 33: Measure And Adjust Manifold (Outlet) Gas Pressure

    4 . Observe manometer gauge to measure outlet pressure of gas valve . To measure low-stage pressure on unit equipped with two-stage valve, disconnect wire from the HI terminal on valve . Be sure to reconnect wire . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 34 1 .8 5 .0 2001–4500 611–1373 2 .8 8 .1 1 .5 4 .1 Table 21, disconnect manometer 6 . When manometer reading indicates that outlet pressure is in accordance with and install cap(s) on regulator screw(s) . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 35: Measure And Adjust Manifold Gas Pressure-Elevation >2,000 Feet (>610 Meters)

    . b . Select location for label on outside of heater access panel that will be conspicuous to anyone operating or servicing unit . c . Ensure that surface is clean and dry and affix label . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 36 A = normal input , B = thermal output capacity, and C = minimum input . 13 . Observe heater operation for at least one complete cycle to check for safe and proper operation . For models UBZ and UDZ, depress and hold safety door switch . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 37: Maintenance

    ‰ Inspect burner/control compartment annually to determine if cleaning is necessary ‰ Clean all dirt, lint, and grease from combustion air opening (models UBX and UDX) and venter assembly ‰ Clean all dirt, lint, and grease from fan blade, fan guard, and motor ‰...
  • Page 38 . Each baffle is held in place by one screw . (2) For correct re-assembly on secondary air shield, mark location (top and bottom) of each baffle . (3) Remove screw(s) and remove baffle(s) (all) . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 39 . Leak test connection using leak detecting solution . If leak is detected, tighten connection . If leak cannot be stopped by tightening connection, replace part(s) . 6. Turn ON electric and gas. 7. Check for proper operation. I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 40: Burner Orifice Maintenance

    ⚠ WARNING ⚠ Due to high voltage on the spark wire and electrode, do not touch when energized. • The spark gap (see Figure 17) must be maintained to 1/8 inch . Figure 17. Ignitor Spark Gap I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 41: Maintenance Of Fan Motor, Fan Blades, And Fan Guard

    0.5 Inch (13 mm) Spacing with 0.334 Inch (8.5 mm) Spacing (±10)) Inches Millimeters Inches Millimeters 9/16 1-1/16 1-1/2 1-3/4 2-1/8 1-1/2 2-3/8 2-3/8 2-5/16 2-1/8 2-3/8 2-1/8 1-5/8 — 225, 250, 300 1-7/8 1-3/8 Figure 18 . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 42: Venter Motor And Wheel Assembly Maintenance

    11 . Restore electric power to heater and turn ON gas . 12 . Follow instructions on lighting instruction plate to light heater . 13 . Check for proper heater operation . UNIT SIZE 125 UNIT SIZES 150–400 UNIT SIZES 030–100 Figure 19. Venter Motor and Wheel Assembly I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 43: Operating Gas Valve Maintenance

    If it is determined that the high temperature limit control (see Figure 12 . replacement part that is designed for the size of heater . For the approximate limit control location, see Limit Control Door Switch Flame Rollout Switch Transformer Disconnect Switch Figure 20. Replaceable Components I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 44: Flame Rollout Switch Maintenance (Model Udz Unit Sizes 030-125 Only)

    • IMPORTANT: When using a multimeter to troubleshoot the 24V circuit, place the multimeter’s test leads into the connectors located on the ignition control. Do not remove connectors or terminals from the electrical components. Doing so can result in misinterpreted readings caused by the control module’s fault mode monitoring circuits. I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 45 Figure 21. DSI Control Module Troubleshooting Flowchart I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 46: General Troubleshooting

    Ensure that flame sensor lead is not grounded or that sensor insulation or ceramic is not cracked—replace as required c) Incorrect gas pressure Supply pressure should be 5–14 IN WC for natural gas or 11–14 IN WC for propane d) Cracked ceramic at sensor Replace sensor I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...
  • Page 47 Fan or 1 . Low or high voltage supply Correct electric supply venter 2 . Defective motor Replace motor motor cuts out on 3 . Poor airflow Clean motor, fan, and fan guard overload I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

  • Page 48: Installation Record (To Be Completed By Installer)

    If you need additional assistance, contact the Distributor listed above. • For more information, contact your Factory Representative. Specifications and illustrations subject to change without notice or incurring obligations . ©2021 Nortek Global HVAC LLC, O’Fallon, MO . All rights reserved . I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0...

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