Reznor UDZ Installation Operation & Maintenance
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Reznor UDZ 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 (04-21) 1034344-0
Supersedes: — (Original Version)

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Summary of Contents for Reznor UDZ

  • Page 1 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.

  • Page 2: Table Of Contents

    Post-Startup Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 I-UBX-UBZ-UDX-UDZ (04-21) 1034344-0...

  • Page 3: General Information

    Flame Rollout Switch Maintenance (Model UDZ Unit Sizes 030–125 Only) . . . . . . . . . . . . . . .

  • 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 (04-21) 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 (04-21) 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 (04-21) 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 (04-21) 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 (04-21) 1034344-0...
  • Page 9 OPTIONAL 3/8-16 FEMALE THREAD NOZZLE.) - ALL SUSPENSION POINTS LINE VOLTAGE INLET VENT COLLAR (CONNECTS AT CIRCUIT BOARD) EXTERNAL GAS CONNECTION FRONT VIEW RIGHT SIDE VIEW (ACCESS PANEL) Figure 3. Dimensions—Models UDX and UDZ (Refer to Table I-UBX-UBZ-UDX-UDZ (04-21) 1034344-0...

  • Page 10: Clearances

    GENERAL INFORMATION—CONTINUED Dimensions—Continued Table 5. Dimensions—Models UDX and UDZ Dimension (See Figure Unit Size Inches (±1/16) (mm (±2)) 030, 13-3/4 13-13/16 29-3/4 25-9/16 5-15/16 3-1/2 3-11/32 17-3/8 1-9/16 4-9/32 9-9/16 3-3/4 2-15/16 (349) (686) (254) (351) (756) (649) (152) (151)

  • Page 11: Combustion Air Requirements

    Connecting outside air ducts voids the warranty and could cause hazardous operation. • For UBZ and UDZ models, refer to the combustion air requirements in the venting instructions listed in Table •...

  • Page 12: Acoustical Considerations

    Smaller and/or larger vent and combustion air pipe diameters may be permissible . Refer to appropriate venting instructions listed in 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 (04-21) 1034344-0...
  • Page 13 Smaller and/or larger vent and combustion air pipe diameters may be permissible . Refer to appropriate venting instructions listed in 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 (04-21) 1034344-0...
  • Page 14 GENERAL INFORMATION—CONTINUED Acoustical Considerations—Continued Table 11. Technical Data for UDX and UDZ Models (Unit Sizes 030–125) Unit Size Unit of Parameter Measurement 30,000 45,000 60,000 75,000 105,000 120,000 BTUh Input heating capacity 8 .8 13 .2 17 .6 22 .0 30 .8...
  • Page 15 Table 12. Technical Data for UDX and UDZ Models (Unit Sizes 150–400) Unit Size Unit of Parameter Measurement BTUh 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000 Input heating capacity 44 .0 51 .3 58 .6 65 .9 73 .3 87 .9...

  • 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 (04-21) 1034344-0...

  • Page 17: Heater Suspension

    • In the literature bag shipped with the heater, there are three capscrews (PN 203311) and sealing washers (PN 61658) . On UBZ and UDZ models, these capscrews and washers must be used to seal any unused holes in the...

  • 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 (04-21) 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 (04-21) 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 (04-21) 1034344-0...

  • Page 21: Electrical Connections

    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 . To maintain the sealing feature of the electrical box, always replace the cover plate .
  • 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 (04-21) 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 1 .10 1 .30 Blue 350, 400 2 .10 1 .60 1 .10 1 .30 Blue UBZ and UDZ Models Differential Pressure (IN WC) Unit Size Label Color Startup Cold Equilibrium Hot Setpoint OFF Setpoint ON 030 (UBZ) 1 .20 0 .90...

  • Page 25: High Temperature Limit Control

    Interlock Door Switch (UBZ and UDZ Models) Figure 12 All unit sizes of UBZ and UDZ models are equipped with an interlock door switch (see for location) that prevents the heater from operating when the service door panel is open . The service panel is equipped with a pliable gasket that fully seals the door to provide added protection to prevent building air from entering the combustion zone of the heater .

  • Page 26: Thermostat Options

    11) that monitors the safety devices and controls the operation of the fan and venter motors and the gas valve between heat cycles . 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 .

  • 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 (04-21) 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 (04-21) 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 (04-21) 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 (04-21) 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 (04-21) 1034344-0...

  • Page 32: Post-Startup Checklist

    . 4 . Install replacement pressure switch (refer to replacement parts manual listed in Table 1 for PN) using mounting bracket and two screws . Reconnect sensing tube(s) and wires . Figure 14. Pressure Switch I-UBX-UBZ-UDX-UDZ (04-21) 1034344-0...

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

    2 . Connect manometer to 1/8-inch output pressure tap on valve (see 3 . Open manual valve and operate heater . For models UBZ and UDZ, depress and hold door safety switch . 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 .
  • 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 (04-21) 1034344-0...

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

    . Reconnect wire to Hi terminal on gas valve . 7 . Turn up thermostat . For models UBZ and UDZ, depress and hold door safety switch . 8 . Cycle burner once or twice to properly seat adjustment spring in valve and recheck outlet pressure . When pressure...
  • 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 (04-21) 1034344-0...

  • Page 37: Maintenance

    ‰ Check for any damaged wiring and replace as necessary Maintenance Procedures Burner Maintenance Visually inspect the burner compartment (see Figure 16) . If there is an accumulation of dirt, dust, and/or lint, clean the compartment and remove and clean the burner as follows: I-UBX-UBZ-UDX-UDZ (04-21) 1034344-0...
  • 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 (04-21) 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 (04-21) 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 (04-21) 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 (04-21) 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 (04-21) 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 (04-21) 1034344-0...

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

    Check the complete system at least once a year . Inspection should include all joints, seams, concentric adapter box (models UBZ and UDZ), inlet air guard or inlet air cap (models UBZ and UDZ), and the vent terminal cap . Clean all openings and replace any defective parts .
  • Page 45 Figure 21. DSI Control Module Troubleshooting Flowchart I-UBX-UBZ-UDX-UDZ (04-21) 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 (04-21) 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 (04-21) 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 (04-21) 1034344-0...

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