Reznor UEZ Installation, Operation And Maintenance Manual
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Reznor UEZ Installation, Operation And Maintenance Manual

Gas-fired unit heater
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GAS-FIRED UNIT HEATER INSTALLATION, OPERATION,
AND MAINTENANCE
• 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.
• Be sure to read and understand the installation, operation, and service instructions in this
manual.
• 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 phone remote from the building. 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 UEZ
 ⚠ DANGER ⚠ 
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
Revision: UEZ-IOM (07-23) 1034347-I
Supersedes: UEZ-IOM (05-23) 1034347-H

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  • Page 1 Revision: UEZ-IOM (07-23) 1034347-I Supersedes: UEZ-IOM (05-23) 1034347-H GAS-FIRED UNIT HEATER INSTALLATION, OPERATION, AND MAINTENANCE MODEL UEZ  ⚠ 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

    Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 UEZ-IOM (07-23) 1034347-I...
  • Page 3 INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER) ........64 UEZ-IOM (07-23) 1034347-I...

  • Page 4: General Information

    . The ability to properly perform maintenance on this equipment requires certain tools and mechanical skills . • This manual applies only to UEZ models (high-efficiency, separated-combustion, low-static) . References Table 1. Related Technical Manuals Available from Factory Distributor...

  • Page 5: Certification

    • When units are located in the center of the space to be heated, the air should be discharged toward the exposed walls . In large areas, units should be located to discharge air along exposed walls with extra units provided to discharge air in toward the center of the area . UEZ-IOM (07-23) 1034347-I...

  • Page 6: Heater Throw

    38° — 11 (3) 19 (6) 16 (5) 20 (6) 17 (5) 28 (9) 24 (7) 30 (9) 18 (5 .5) 44 (13) 74 (23) 66 (20) 85 (26) Downward louver angle 58° 44° 51° 43° Figure UEZ-IOM (07-23) 1034347-I...

  • Page 7: Mounting Height Requirements

    1/2-inch (12 .7-mm) PVC pipe for connecting to a condensate drain . The water condensed from the products of combustion will be acidic . The level of concentration is dependent upon the environment where the appliance is installed and may be as high as 6 pH . UEZ-IOM (07-23) 1034347-I...

  • Page 8: Dimensions

    7-1/4 (184) 3-1/4 (83) 6-1/8 (156) 6 (152) 3-3/16 (81) 2-1/4 (57) 10-11/16 (271) 3-11/16 (94) 10-11/16 (271) 3/4 (19) 7-7/8 (200) 14-1/8 (359) 7-7/8 (200) 5-1/8 (130) 8-1/8 (206) 3-3/8 (86) Heater suspension points (3/8-16 FEM) . UEZ-IOM (07-23) 1034347-I...
  • Page 9 27-11/16 (703) 58 (1473) 48-21/32 (1236) 16-15/32 (418) 130, 180 8-5/16 (211) 4-5/16 (110) 5-1/16 (129) 6-9/32 (160) 1-3/4 (45) 260, 310 9-3/32 (231) 5-3/32 (129) 18-13/16 (478) 7-1/32 (179) 1-3/8 (35) Heater suspension points (3/8-16 FEM) . UEZ-IOM (07-23) 1034347-I...

  • Page 10: Venting And Combustion Air Requirements

    2 (51) 3 ( 914) 25 (7 .6) concentric vent 3 (76) 50 ( 15 .2) 3 (76) 3 ( 914) 50 ( 15 .2) All 90-degree elbows in the vent system must be sweep type . UEZ-IOM (07-23) 1034347-I...

  • Page 11: Vent/Combustion Air Piping Requirements (Unit Sizes 130-310)

    . For safe performance of the heater, each condensate drain must include a trap . Install the condensate Condensate Drain Installation drains in accordance with the section . • Venter outlet and combustion air inlet: located at rear of heater (see Figure 5) . UEZ-IOM (07-23) 1034347-I...
  • Page 12 130, 180 260, 310 or Connection Dimension/Diameter (Inches (mm)) 8-1/4 (210) 3-1/4 (83) 8-5/16 (211) 9-3/32 (231) 4-5/16 (110) 5-1/16 (129) Combustion air pipe collar 6 (153) PVC vent pipe 4 (102) PVC condensate drain pipe 1/2 (13) UEZ-IOM (07-23) 1034347-I...

  • Page 13: 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 . UEZ-IOM (07-23) 1034347-I...

  • Page 14: 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 . UEZ-IOM (07-23) 1034347-I...

  • Page 15: Installation

    Adapts 3/8-inch hangers for four-point suspension from 1-inch threaded pipe Single-stage thermostat Multiple fan control: option CL31 includes components for one control unit and one additional unit— CL31, CL32 option CL32 includes components for each additional non-control unit Locking cover for CL1 thermostat UEZ-IOM (07-23) 1034347-I...

  • Page 16: Heater Suspension

    Options CK8 (two-point suspension, unit sizes 055–110) and CK10 (four-point suspension) are for suspending the heater using swivel connectors connected to 1-inch pipe . Attach the swivel connectors at the 3/8-16 threaded nut retainers . Ensure that the swivel connectors are locked to the heater as shown in Figure UEZ-IOM (07-23) 1034347-I...

  • Page 17: Heater Suspension Using Field-Supplied Threaded Rods

    • Test pressures above 1/2 psi—disconnect the heater and manual valve from the gas supply line to be tested. Cap or plug the supply line. • Test pressures below 1/2 psi—before testing, close the manual valve on the heater. UEZ-IOM (07-23) 1034347-I...

  • Page 18: Gas Supply Piping

    Table 13. Gas Supply Line Sizes Diameter of Pipe (Inches) 1-1/4 1-1/2 Length of Pipe Natural Natural Natural Natural Natural Natural Propane Propane Propane Propane Propane Propane (Feet) Cubic Feet per Hour 1100 2100 1281 1650 1007 1450 1270 1105 1050 UEZ-IOM (07-23) 1034347-I...

  • Page 19: Supply Piping Connections

    NOTE: IMPORTANT: For unit sizes 055, 085, and 110, install the venting system in accordance with the venting system manufacturer’s instructions. For unit sizes 130, 180, 260, and 310, install the venting system in accordance with the following paragraphs. UEZ-IOM (07-23) 1034347-I...

  • Page 20: Concentric Adapter Box Connections

    • The concentric adapter box is shown HEATER SIDE VIEW There is silicone ring around this opening in box. Loosen screws on pipe support bracket. Adjust bracket to provide good seal with ring and tighten screws. Figure 11. Concentric Adapter Box UEZ-IOM (07-23) 1034347-I...
  • Page 21 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 12. Concentric Adapter Box Dimensions and Connections UEZ-IOM (07-23) 1034347-I...

  • Page 22: Vent Terminal Options

    Concentric adapter box with silicone sealing ring (see Figure 11 Figure Figure 221185 Rain collar (see Figure 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 UEZ-IOM (07-23) 1034347-I...
  • Page 23 3 . Cut hole through outside wall for combustion air pipe . a . Ensure that location and orientation of concentric adapter box are correct and mark and cut hole . b . Ensure that hole accommodates 8-inch (203-mm) combustion air pipe . UEZ-IOM (07-23) 1034347-I...
  • Page 24 Figure 16, DETAIL A . a . Insert combustion air pipe through roof as shown in b . Position concentric adapter box to match pipe runs and secure box to underside of roof using field-supplied hardware . UEZ-IOM (07-23) 1034347-I...
  • Page 25 7 . Install indoor combustion air pipe: a . Secure single-wall combustion air pipe run to collar on concentric adapter box using field-supplied sheet metal screws . b . Seal pipe joint using tape or sealant . UEZ-IOM (07-23) 1034347-I...

  • Page 26: Horizontal Vent Terminal (Option Cc6) Installation

    . 22 .5-degree elbow (if available) c . Flashing d . Sheet metal screws, tape, and sealant, as required • Factory-supplied components for installation of the horizontal vent kit are listed in Table 17 and shown in Figure 18 . UEZ-IOM (07-23) 1034347-I...
  • Page 27 . 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 . UEZ-IOM (07-23) 1034347-I...
  • Page 28 . Turn combustion air pipe so that is toward top side of concentric adapter box and slide it on collar . d . Secure combustion air pipe to collar using sheet metal screws and seal joint and seam using sealant or tape . UEZ-IOM (07-23) 1034347-I...
  • Page 29 6 . Install air inlet ring guard: Figure 19 . a . Position inlet air ring guard over end of combustion air pipe in accordance with b . Secure inlet air ring guard to inlet air pipe using four 1/2-inch-long screws provided . UEZ-IOM (07-23) 1034347-I...
  • Page 30 5b prevents rain water from running through pipe into concentric adapter box . Figure 19 VENTING AND COMBUSTION AIR 12 . Verify compliance with and with all specifications listed in REQUIREMENTS Hazards of Chlorine sections . UEZ-IOM (07-23) 1034347-I...

  • Page 31: 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 20. Vent Condensate Drain Trap UEZ-IOM (07-23) 1034347-I...

  • Page 32: Vent Condensate Drain Installation (Unit Sizes 055-110)

    1 . Connect field-supplied PVC tee to 4-inch vent outlet on back of heater . 2 . Connect 4-inch PVC cleanout cap to tee . Cap is drilled and tapped for 1/2-inch NPT drain connection . 3 . Connect field-supplied condensate drain to cap . UEZ-IOM (07-23) 1034347-I...

  • Page 33: Vent Condensate Drain Installation (Unit Sizes 130-310)

    (2) Connect field-supplied fitting(s) to tee as needed for 1/2-inch or larger condensate drain line . COUPLING COUPLING VENT PIPE VENT PIPE 12–24 12–24 (305–610) DRAIN (305–610) FITTING(S) DETAIL A (US ONLY) DETAIL B (US AND CANADA) Figure 23. Installing Condensate Drain in Vertical Vent (Unit Sizes 130–310) UEZ-IOM (07-23) 1034347-I...

  • Page 34: Heat Exchanger Condensate Drain Installation

    150°C. NOTES: • Ensure that all wiring is in accordance with the wiring diagram provided with the unit. • A two-stage valve circuit is NOT available on all models. UEZ-IOM (07-23) 1034347-I...
  • Page 35 . The hot wire must be connected to terminal L1 on the circuit board . TERMINAL STRIP FOR THERMOSTAT CONNECTION LINE VOLTAGE ENTRANCE TERMINAL STRIP FOR THERMOSTAT CONNECTION UNIT SIZES 055–110 UNIT SIZES 130–310 Figure 25. Supply Wiring Entrance and Control Connection Terminal Strip Figure 26. Circuit Board (DSI Control Module) UEZ-IOM (07-23) 1034347-I...

  • Page 36: Controls

    UNIT SIZES 055–110 PRESSURE SWITCH HIGH TEMPERATURE LIMIT CONTROL DISCONNECT SWITCH FLAME SENSOR MOTOR VENTER MOTOR IGNITOR INTERLOCK DOOR SWITCH VENT TEMPERATURE TRANSFORMER DSI CONTROL MODULE COMBINATION LIMIT SWITCH GAS VALVE UNIT SIZES 130–310 Figure 27. Component Locations UEZ-IOM (07-23) 1034347-I...

  • Page 37: Thermostat Options

    . The main burner will remain off until the system has cooled and/or the flue system resistance is reduced . Table 19 . • Pressure switch settings are listed in UEZ-IOM (07-23) 1034347-I...

  • Page 38: High Temperature Limit Control

    (heater is on with no faults), or flashing (heater is on with fault(s)) . Additional status indications appear on the display at the bottom of the control module (labeled as DSP1, see Figure 26) . The display’s codes are listed and described in the Unit Troubleshooting Using DSI Control Module section . UEZ-IOM (07-23) 1034347-I...

  • Page 39: Venter Motor

    • All components of a gas supply system must be leak tested prior to placing equipment in service. NEVER TEST FOR LEAKS WITH AN OPEN FLAME. Failure to comply could result in personal injury, property damage, or death. UEZ-IOM (07-23) 1034347-I...

  • Page 40: Pre-Startup Checklist

    3 . Open access door and locate gas control (ON/OFF) knob or switch on combination gas valve (see Figure 28) . Top View ON/OFF Switch Figure 28. Combination Gas Valve ON/OFF Control UEZ-IOM (07-23) 1034347-I...

  • Page 41: Operating Sequences

    SSD displays “5” Control is in soft lockout “L” before returning to normal operation Pressure switch is closed SSD displays “4” Control waits indefinitely for pressure switch to open Pressure switch is open Control proceeds to step 2 UEZ-IOM (07-23) 1034347-I...
  • Page 42 Control deenergizes gas valve and proceeds to steps 6 and 7 removed 6 . Post-purge Thermostat is satisfied Venter motor remains on for 45-second post-purge period 7 . Fan/blower Fan/blower motor is deenergized after selected fan/blower OFF delay OFF delay UEZ-IOM (07-23) 1034347-I...
  • Page 43 Fan remains energized as long as call for fan remains without call for heat Thermostat calls for heat (W) during Fan/blower is deenergized 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) . UEZ-IOM (07-23) 1034347-I...

  • Page 44: Vent System Testing

    . Do not operate a summer exhaust fan . 7 . Following lighting instructions provided with heater, place utility heater being inspected in operation . Adjust thermostat so that utility heater will operate continuously . UEZ-IOM (07-23) 1034347-I...

  • Page 45: Post-Startup Checklist

    3 . Remove two screws that secure mounting bracket and remove bracket and pressure switch . Save bracket and screws for reuse . 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 . UEZ-IOM (07-23) 1034347-I...

  • Page 46: Measure And Adjust Manifold (Outlet) Gas Pressure

    Converting Unit from Natural Gas to Propane section to convert for use with propane. Inlet supply pressure to the valve for propane must be a minimum of 11 IN WC and a maximum of 14 IN WC. UEZ-IOM (07-23) 1034347-I...

  • Page 47: Measure And Adjust Manifold Gas Pressure-Elevation ≤2,000 Feet (≤610 Meters)

    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 UEZ-IOM (07-23) 1034347-I...

  • Page 48: Measure And Adjust Manifold Gas Pressure-Elevation >2,000 Feet (>610 Meters)

    . Ensure that surface is clean and dry and affix label . 13 . Observe heater operation for at least one complete cycle to check for safe and proper operation . Depress and hold safety door switch . UEZ-IOM (07-23) 1034347-I...

  • Page 49: Converting Unit From Natural Gas To Propane

    661057 661079 661082 120145 196899 1034352 196903 Burner orifice Drill size 1 .2 mm 1 .25 mm 3 .3 mm 4 .6 mm Quantity Conversion 64391 64391 Label Regulated propane 79718 79718 Gas disk Propane 37752 37752 UEZ-IOM (07-23) 1034347-I...

  • Page 50: Maintenance

    Figure 31) . If there is an accumulation of dirt, dust, and/or lint, Visually inspect the burner compartment (see clean the compartment and remove and clean the burners as follows: UEZ-IOM (07-23) 1034347-I...
  • Page 51 . 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 . UEZ-IOM (07-23) 1034347-I...

  • Page 52: Burner Maintenance (Unit Sizes 130-310)

    . 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) . UEZ-IOM (07-23) 1034347-I...
  • Page 53 . 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 . UEZ-IOM (07-23) 1034347-I...

  • Page 54: Burner Orifice Maintenance

    . ⚠ WARNING ⚠ Due to high voltage on the spark wire and electrode, do not touch when energized. • The spark gap (see Figure 33) must be maintained to 1/8 inch . UEZ-IOM (07-23) 1034347-I...

  • Page 55: Maintenance Of Fan Motor, Fan Blades, And Fan Guard

    12 . Follow instructions on lighting instruction plate to light heater . 13 . Check for proper heater operation . Table 26. Fan Blade Positioning Unit Size 130, 180 Dimension A (Inches (mm)) 1-1/4 (32) 2-5/16 (59) 2-3/8 (60) 1-5/8 (67) 2 (51) 1-7/8 (48) Figure 34 . UEZ-IOM (07-23) 1034347-I...

  • Page 56: Venter Motor And Wheel Assembly Maintenance

    Combination Gas Valve Maintenance ⚠ WARNING ⚠ The combination gas valve is the prime safety shutoff. All gas supply lines must be free of dirt or scale before connecting them to the unit to ensure positive closure. UEZ-IOM (07-23) 1034347-I...

  • Page 57: Pressure Switch Maintenance

    Use a voltmeter to verify that there are 24V output from the transformer (see functioning, it must be replaced . Use a replacement transformer identical to the factory-installed model . For the Figure 27 . transformer location, see UEZ-IOM (07-23) 1034347-I...

  • Page 58: Vent Temperature Limit Switch Maintenance

    Check the condensate disposal system annually . Remove the condensate traps and flush them with clear tap water to remove any sediment that may have accumulated . Check to be ensure that the piping to the sanitary drain has not been damaged . Check the sanitary drain to verify that it flows freely . UEZ-IOM (07-23) 1034347-I...

  • Page 59: 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 UEZ-IOM (07-23) 1034347-I...

  • Page 60: Unit Troubleshooting Using Dsi Control Module

    • Remove and reapply power to the control module to view the last five fault codes stored in its memory. The most recent to least recent fault codes will be displayed. Figure 37 • See for a flowchart for troubleshooting the unit using the DSI control module . UEZ-IOM (07-23) 1034347-I...
  • Page 61 Figure 37. DSI Control Module Troubleshooting Flowchart UEZ-IOM (07-23) 1034347-I...
  • Page 62 Lockout from failed ignition or flame loss Pressure switch is not closed within 30 seconds of venter motor energizing Flashing Pressure switch is closed before venter motor is energized Limit switch or rollout open Undesired flame Polarity reversed Steady Internal fault/power failure UEZ-IOM (07-23) 1034347-I...
  • Page 63 NOTES UEZ-IOM (07-23) 1034347-I...

  • Page 64: Installation Record (To Be Completed By Installer)

    Company Address Phone No. For more information on Reznor HVAC products: • Contact your local Reznor representative at 1-800-695-1901 • Refer to the technical specifications, manuals, and consumer materials found at www.reznorhvac.com Specifications and illustrations subject to change without notice or incurring obligations .

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