Reznor UEZ Manual
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Reznor UEZ Manual

Unit heater
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UNIT HEATER INSTALLATION/OPERATION/MAINTENANCE
MODEL UEZ: HIGH-EFFICIENCY, SEPARATED-COMBUSTION, LOW-STATIC
• 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.
 ⚠ DANGER ⚠ 
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
Revision: I-UEZ (04-21) 1034347-0
Supersedes: — (Original Version)

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  • Page 1 Revision: I-UEZ (04-21) 1034347-0 Supersedes: — (Original Version) UNIT HEATER INSTALLATION/OPERATION/MAINTENANCE MODEL UEZ: HIGH-EFFICIENCY, SEPARATED-COMBUSTION, LOW-STATIC  ⚠ 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.

  • Page 2: Table Of Contents

    Venter Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 I-UEZ (04-21) 1034347-0...
  • Page 3 INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER)........60 I-UEZ (04-21) 1034347-0...

  • Page 4: General Information

    • Installation should be done by a qualified agency in accordance with these instructions. The qualified service agency installing this high efficiency separated-combustion system is responsible for the installation. I-UEZ (04-21) 1034347-0...

  • Page 5: Certification

    • Refer to the venting instructions provided with the unit for venting requirements . • Refer to the following sections of this manual to determine where to suspend the heater: Heater Throw, Mounting Height Requirements, Hazards of Chlorine, Dimensions, Clearances, Weights, and Venting and Combustion Requirements . I-UEZ (04-21) 1034347-0...

  • Page 6: Heater Throw

    3 .0 −32° −25° −29° −25° 3 .7 −39° −30° −34° −30° 4 .3 −45° −34° −40° −34° 4 .9 −51° −39° −45° −38° 5 .5 −58° −44° −51° −43° Distance in meters (see Figure 1) . I-UEZ (04-21) 1034347-0...

  • 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 Table 4 . All dimensions are in inches (mm) . Unit dimensions are shown in and listed in I-UEZ (04-21) 1034347-0...

  • Page 8: Clearances

    90°F (50°C) above the surrounding ambient temperature is not exceeded . Refer to the dimensions Table 4 Figure 2 listed in and shown in when determining clearances to combustibles . I-UEZ (04-21) 1034347-0...

  • Page 9: Weights

    • Vent pipe: schedule 40 PVC or CPVC pipe—in Canada, all PVC vent pipe must be approved to ULC 636 . • Combustion air inlet pipe: sealed, single-wall galvanized pipe is recommended . • Venter outlet and combustion air inlet: located at rear of heater (see Figure 3) . I-UEZ (04-21) 1034347-0...
  • Page 10 All 90-degree elbows in the vent system must be sweep type . NOTE: The minimum/maximum requirements for the length of vent pipe that extends outdoors are different Vent Terminal Options section for horizontal and vertical vent terminals (refer to I-UEZ (04-21) 1034347-0...

  • Page 11: Vent/Combustion Air System Piping Joints

    . Working quickly while cement is fluid, insert pipe into coupler (fitting) until it touches socket bottom . a . Turn pipe quarter turn and hold joint together until pipe will not pull out . b . Clean excessive cement from exterior—properly made joint will have continuous bead of cement around perimeter . I-UEZ (04-21) 1034347-0...

  • Page 12: Vent/Combustion Air System Piping Support

    . • This unit heater is a high-efficiency appliance designed to extract part of the latent heat from the products of combustion . I-UEZ (04-21) 1034347-0...

  • Page 13: Technical Data

    Size shown is for gas connection to a single-stage gas valve—not supply line size . MOCP = 2 .25 × (largest motor FLA) + smallest motor FLA . Answer is rounded to the next lower standard circuit breaker size . I-UEZ (04-21) 1034347-0...

  • Page 14: Installation

    50- to 90-degree variable air deflection range 25- to 65-degree variable air deflection range nozzle with vertical louvers Manual shutoff valve Natural gas or propane Hanger kit CK10 Adapts 3/8-inch hangers for suspension from 1-inch threaded pipe I-UEZ (04-21) 1034347-0...

  • Page 15: Heater Suspension

    . Swivel connectors are threaded to suspend heater from 1-inch pipe . DETAIL B DETAIL A Figure 6. Heater Suspension Suspension of Heater with Downturn Nozzle Downturn nozzle kits (option CD2, CD3, or CD4) require four-point suspension . Follow the instructions provided with the kit to install . I-UEZ (04-21) 1034347-0...

  • Page 16: Piping Connections

    • Variables for sizing gas supply lines are listed in Table 12 . 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-UEZ (04-21) 1034347-0...

  • Page 17: Supply Piping Connections

    • The gas connection is made at the pipe nipple that extends outside the cabinet, as shown in Figure Table 13. Gas Connection Sizes Natural Gas Propane Unit Size Connection (Inches) 130, 180 260, 310 Connection size for a standard unit (not gas supply line size) . Figure 7. Gas Connections I-UEZ (04-21) 1034347-0...

  • Page 18: Concentric Adapter Box Connections

    INSTALLATION—CONTINUED Concentric Adapter Box Connections • All model UEZ installations require a concentric adapter box . The concentric adapter box is included in the vent/ combustion air kit, which is ordered with the heater . • A horizontal terminal vent/combustion air kit is option CC6; a vertical terminal vent/combustion air kit is option CC2 .
  • Page 19 Combustion Air Pipe (136mm) Heater 4-3/32” Side (104mm) View 6-1/8” (156mm) Silicone 14-3/8” Ring (365mm) 6-1/8” (156mm) 5-9/32” (134mm) Opening for 4” diameter Vent Pipe 1-1/16” (27mm) 16” (406mm) 17” (432mm) Figure 9. Concentric Adapter Box Dimensions and Connections I-UEZ (04-21) 1034347-0...

  • Page 20: Vent Terminal Options

    221250 Combustion air inlet (see 221091 Cap, condensate drain connection, 4-inch PVC Figure 221215 Bird guard (see 37661 Screw, self-drilling, #10-16 × 1/2, bird guard RAIN COLLAR COMBUSTION AIR INLET BIRD GUARD Figure 11. Option CC2 Components I-UEZ (04-21) 1034347-0...
  • Page 21 . Select location away from fresh air intakes, allowing space for concentric adapter box inside . Vent terminal must be located away from adjacent buildings as shown in Figure 12 . Rear View Side View Figure 12. Option CC2 Installation I-UEZ (04-21) 1034347-0...
  • Page 22 18 inches (457 mm) above roof . b . Secure inlet air pipe to collar of concentric adapter box using sheet metal screws . Seal joint and seam using tape or sealant . DETAIL A Figure 13. Combustion Air Pipe Installation I-UEZ (04-21) 1034347-0...
  • Page 23 BIRD GUARD RAIN COLLAR COMBUSTION AIR INLET Figure 14. Combustion Air Inlet, Rain Collar, and Bird Guard 9. Verify compliance with Figure 12 and with all specifications listed in Venting and Combustion Air Requirements Hazards of Chlorine sections. I-UEZ (04-21) 1034347-0...

  • Page 24: Horizontal Vent Terminal (Option Cc6) Installation

    . Ensure that distance of vent terminal from adjacent public walkways and buildings and window and building openings complies with local codes . Absent any local codes, distance must comply with National Fuel Gas Code Z223 .1 . I-UEZ (04-21) 1034347-0...
  • Page 25 3. Cut hole through outside wall for combustion air pipe. a . Ensure that outside wall construction thickness is between 1 inch (25 mm) minimum and 48 inches (1,219 mm) maximum . b . Ensure that hole accommodates 8-inch (203-mm) combustion air pipe . I-UEZ (04-21) 1034347-0...
  • Page 26 . Secure combustion air pipe to collar using sheet metal screws and seal joint and seam using sealant or tape . Unit Size feet meters inches mm 130, 180 260, 310 10 1219 **Minimum: check for and comply with local codes. Figure 16. Option CC6 Installation I-UEZ (04-21) 1034347-0...
  • Page 27 5b prevents rain water from running through pipe into concentric adapter box . 12. Verify compliance with Figure 16 and with all specifications listed in Venting and Combustion Air Requirements Hazards of Chlorine sections. I-UEZ (04-21) 1034347-0...

  • Page 28: Condensate Drain Installation

    Cap is drilled and tapped for 1/2-inch NPT fitting Vent drain connection fittings may be field-supplied as shown Drain must be 1/2-inch or larger Trap requirements are same for either type of connection Drain Trap Figure 17. Vent Condensate Drain Trap I-UEZ (04-21) 1034347-0...

  • Page 29: Vent Condensate Drain Installation

    • Instructions for installing a condensate drain connection with a vertical or horizontal vent (US OR CANADIAN Figure 22 . INSTALLATIONS) using field-supplied vent and drain components are shown in • Ensure that the drain trap is in accordance with Figure 17 . I-UEZ (04-21) 1034347-0...
  • Page 30 (slope downward away from heater) 4" diameter pipe 12" (305 mm) Field-supplied fittings minimum (as needed for 1/2-inch or 24" (610 mm) larger condensate drain line) maximum Figure 20. Installing Condensate Drain in Vertical Vent (US or Canadian Installation) I-UEZ (04-21) 1034347-0...
  • Page 31 Field-supplied fittings at heater (as needed for 1/2-inch or larger condensate drain) Figure 22. Installing Condensate Drain in Vertical or Horizontal Vent (US or Canadian Installation) I-UEZ (04-21) 1034347-0...

  • Page 32: Heat Exchanger Condensate Drain Installation

    . 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 . I-UEZ (04-21) 1034347-0...

  • Page 33: Controls

    Figure 24. Circuit Board (DSI Control Module) CONTROLS NOTE: Refer to the Troubleshooting section for probable causes and reset instructions for the following controls. Figure 25 . Locations for the following controls are shown in I-UEZ (04-21) 1034347-0...

  • Page 34: Thermostat Options

    C, R, G, W1, and W2 . Refer to the wiring diagram provided with the heater . • If the heater was ordered with a multiple heater control option, one thermostat can be used to control up to six I-UEZ (04-21) 1034347-0...

  • Page 35: Main Operating Gas Valve

    . The control is factory-set and is non-adjustable . If the setpoint is reached, the control interrupts the electric supply to the gas valve . This safety device provides protection in the case of motor failure or lack of airflow due to a restriction at the inlet or outlet . I-UEZ (04-21) 1034347-0...

  • Page 36: Vent Temperature Limit Switch

    Figure 24) . Refer to the Circuit Board (DSI Control Module) airflow . Operation is controlled by the circuit board (see section for details . I-UEZ (04-21) 1034347-0...

  • Page 37: Operation

    ‰ Check polarity—verify that line voltage exists between black L1 wire and earth ground ‰ If installation elevation is >6,000 feet (>1,830 meters), replace pressure switch in accordance with Pressure Switch Replacement section I-UEZ (04-21) 1034347-0...

  • Page 38: Startup

    . If heater does not operate, follow instructions in step 13 or on heater operating label and call your service technician . b . If heater operates, thermostat calls for heat, which energizes venter motor . 10 . Pressure switch closes, which fires unit . I-UEZ (04-21) 1034347-0...

  • Page 39: 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-UEZ (04-21) 1034347-0...
  • Page 40 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-UEZ (04-21) 1034347-0...

  • Page 41: Vent System Testing

    . 9 . If improper venting is observed during above tests, vent system must be corrected . I-UEZ (04-21) 1034347-0...

  • Page 42: Post-Startup Checklist

    . Table 1 4 . Install replacement pressure switch (refer to replacement parts manual listed in for PN) using mounting bracket and two screws . Reconnect sensing tube(s) and wires . Figure 27. Pressure Switch I-UEZ (04-21) 1034347-0...

  • Page 43: Measure And Adjust Manifold (Outlet) Gas Pressure

    Use a water column manometer that is readable to the nearest tenth of an inch. 2 . Connect manometer to 1/8-inch output pressure tap on valve (see Figure 28) . I-UEZ (04-21) 1034347-0...
  • Page 44 7 .1 6 .7 8001–9000 2441–2745 2 .4 6 .7 6 .3 9001–10,000 2746–3045 2 .2 6 .4 6 .0) Canada 0–2000 0–610 3 .5 10 .0 9 .5 2001–4500 611–1373 2 .8 8 .1 7 .7 I-UEZ (04-21) 1034347-0...

  • Page 45: For Installations At High Elevations, Measure And Adjust The Manifold (Outlet) Gas Pressure As Follows

    150,500 136,955 223,600 205,712 262,300 238,693 (1831–2135) 7001–8000 110,040 102,337 147,000 133,770 218,400 200,928 256,200 233,142 (2136–2440) 8001–9000 107,420 99,901 143,500 130,585 213,200 196,144 250,100 227,591 (2441–2745) 9001–10,000 104,800 97,464 140,000 127,400 208,000 191,360 244,000 222,040 (2746–3045) I-UEZ (04-21) 1034347-0...

  • Page 46: Converting Unit From Natural Gas To Propane

    VR83XXT VR83XXK VR83XXM 3 .3 mm 120145 — — 196899 — Burner orifice 4 .6 mm — 1034352 — — 196903 Conversion 64391 Label Regulated propane 79718 Gas disk Propane 37752 XX = variable numeric charactors . I-UEZ (04-21) 1034347-0...

  • Page 47: Maintenance

    ‰ Check gas valve to ensure that gas flow is being shut off completely ‰ Check vent or vent/combustion air system for soundness and clean openings ‰ Replace any parts that do not appear sound ‰ Check for any damaged wiring and replace as necessary I-UEZ (04-21) 1034347-0...

  • Page 48: Maintenance Procedures

    (3) Slide orifice adapter out through bracket on burner while pushing gas train to right . This will move gas train out of way . b . Detach control assembly: (1) Remove two screws that secure control assembly bracket . (2) Being careful not to disconnect any wires, slide control assembly to right . I-UEZ (04-21) 1034347-0...
  • Page 49 . 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-UEZ (04-21) 1034347-0...

  • Page 50: Burner Orifice Maintenance

    ⚠ WARNING ⚠ Due to high voltage on the spark wire and electrode, do not touch when energized. • The spark gap (see Figure 30) must be maintained to 1/8 inch . Figure 30. Ignitor Spark Gap I-UEZ (04-21) 1034347-0...

  • Page 51: Maintenance Of Fan Motor, Fan Blades, And Fan Guard

    10 . Install access panel . 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 . I-UEZ (04-21) 1034347-0...

  • Page 52: Venter Motor, Wheel, And Pressure Sensing Tap Maintenance

    7 . Install access panel . 8 . Restore electric power to heater and turn ON gas . 9 . Follow instructions on lighting instruction plate to light heater . 10 . Check for proper heater operation . I-UEZ (04-21) 1034347-0...

  • Page 53: Operating Gas Valve Maintenance

    Use a voltmeter to verify that there are 24V output from the transformer (see Figure 33) . If the transformer is not functioning, it must be replaced . Use a replacement transformer identical to the factory-installed model . For the transformer location, see Figure 25 . I-UEZ (04-21) 1034347-0...

  • Page 54: Vent Temperature Limit Switch Maintenance

    • 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-UEZ (04-21) 1034347-0...
  • Page 55 Figure 34. DSI Control Module Troubleshooting Flowchart I-UEZ (04-21) 1034347-0 I-UD&APD (03-19) PN195673R33...

  • Page 56: General Troubleshooting

    TROUBLESHOOTING—CONTINUED General Troubleshooting Table 28 Refer to for general troubleshooting symptoms, probable causes, and remedies . Table 28. General Troubleshooting Symptom Probable Cause Remedy Venter 1 . No power to unit Turn ON power and check supply fuses or circuit breaker motor will 2 .
  • Page 57 Table 28. General Troubleshooting —Continued Symptom Probable Cause Remedy Burner 1 . Gas pressure too high or too low Supply pressure should be 5–14 IN WC for natural gas or 11–14 IN WC for cycles ON propane and OFF 2 . Burner not grounded Ensure that integrated circuit board is grounded (terminals P1–9) 3 .
  • Page 58 NOTES I-UEZ (04-21) 1034347-0...
  • Page 59 NOTES I-UEZ (04-21) 1034347-0...

  • Page 60: 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-UEZ (04-21) 1034347-0...

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