Reznor LDAP Installation Operation & Maintenance
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Reznor LDAP Installation Operation & Maintenance

Downflow unit heater
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DOWNFLOW UNIT HEATER
INSTALLATION/OPERATION/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 LDAP
 ⚠ DANGER ⚠ 
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
Revision: LDAP-IOM (01-22) 207733-A
Supersedes: I-LDAP (01-19) PN207733R11

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  • Page 1 Revision: LDAP-IOM (01-22) 207733-A Supersedes: I-LDAP (01-19) PN207733R11 DOWNFLOW UNIT HEATER INSTALLATION/OPERATION/MAINTENANCE MODEL LDAP  ⚠ 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

    Air Destratification Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 LDAP-IOM (01-22) 207733-A...

  • Page 3: General Information

    . The ability to properly perform maintenance on this equipment requires certain tools and mechanical skills . • The instructions in this manual apply only to model LDAP heaters . References Table 1. Related Technical Manuals Available from Factory Distributor...

  • Page 4: Important Safety Information

    • Children should be supervised to ensure that they do not play with the appliance. Certification • All model LDAP high-bay packaged heaters are design-certified by ITS for use in industrial and commercial installations . • All unit sizes are available for use with either natural or propane gas . The type of gas, the input rate, and the electrical supply requirement are shown on the heater rating plate .

  • Page 5: Installation Codes

    These indirect-fired, indoor, downflow packaged heaters are available in three different configurations, as shown Figure UNIT SIZE 400 ONE DOWNFLOW HEATER UNIT SIZE 800 ONE HEATER WITH TWO DOWNFLOW HEAT SECTIONS UNIT SIZE 1200 ONE HEATER WITH THREE DOWNFLOW HEAT SECTIONS Figure 1. Cabinet Configurations LDAP-IOM (01-22) 207733-A...

  • Page 6: Unit Location

    Y = DISTANCE FROM 0 TO END OF FLOOR COVERAGE Z = DISTANCE FROM 0 TO POINT WHERE AIR VELOCITY DROPS TO <50 FEET (15.2 METERS) PER MINUTE Y − X = LENGTH OF FLOOR COVERAGE Figure 2. Heater Throw Patterns (Refer to Table LDAP-IOM (01-22) 207733-A...

  • Page 7: Mounting Height Requirements

    Care should be taken to separate these vapors from the combustion process . This may be done by wise location of the heater with regard to exhausters or prevailing wind directions . Chlorine is heavier than air . Keep these facts in mind when determining installation location of the heater in relation to building exhaust systems . LDAP-IOM (01-22) 207733-A...

  • Page 8: Dimensions

    34-3/8” (873mm) 9-7/8” (251mm) Thermostat 9-1/4” (235mm) 2-5/8” Connection (67mm) 13-1/8” (333mm) Line Voltage Connection 48-1/2” Front (1232mm) Disconnect Switch 38” View 965mm) 1” NPT Gas Connection Right Side View 1-1/4” (32mm) Figure 3. Dimensions—Unit Size 400 LDAP-IOM (01-22) 207733-A...
  • Page 9 38” Switch (965mm) 1-1/4” Gas Connection 1-1/4” (32mm) 5-5/8” 23” 23” 23” (143mm) (584mm) (584mm) (584mm) 11-3/4” 11-3/4” (298mm) (298mm) 3-1/4” (83mm) 23” (584mm) Discharge Discharge Discharge Opening Opening Opening Figure 4. Dimensions—Unit Sizes 800 and 1200 LDAP-IOM (01-22) 207733-A...

  • Page 10: Clearances

    Before installing the heater, ensure that the supporting structure to be used has sufficient load-carrying capacity to support the weight (refer to Table 4) of the unit . Table 4. Unit Weights Unit Size Pounds (kg) 375 (170) 805 (365) 1200 1195 (542) LDAP-IOM (01-22) 207733-A...

  • Page 11: Combustion Air Requirements

    • Do not install a unit in a confined space without providing wall openings leading to and from the space. • A model LDAP power-vented heater is designed to take combustion air from the space in which the heater is installed and is not designed for connection to outside combustion air intake ducts.

  • Page 12: Acoustical Considerations

    Pascal (Pa) 0 .015 0 .020 0 .025 microbar (µbar) 0 .145 0 .200 0 .250 Quantity is one (1) for unit size 400, two (2) for unit size 800, and three (3) for unit size 1200 . LDAP-IOM (01-22) 207733-A...

  • Page 13: Installation

    • When the heater is lifted for suspension, support the bottom of the heater with the crate bottom. If the bottom is not supported, damage could occur. • Before suspending or wall-mounting the heater, ensure that all screws used for holding shipping brackets have been re-installed in the cabinet. LDAP-IOM (01-22) 207733-A...

  • Page 14: Suspension-Mounting

    • To prevent potential movement, field-supplied angles must be placed around the perimeter of the heater to anchor it to the structural supports . • Structural supports must be placed as shown in Figure 8 to prevent damage to the heater . • All structural supports must be noncombustible materials . LDAP-IOM (01-22) 207733-A...

  • Page 15: Piping Connections

    All dimensions are measured from centerlines of field-supplied structural supports Field-Supplied Mounting Angles (MUST be on all four sides of the Model heater.) LDAP 400 Model LDAP 800 (1 heat section) (2 heat sections) Front View Front View Wall Side View...

  • Page 16: Gas Supply Piping

    Supply Piping Connections ⚠ CAUTION ⚠ IMPORTANT: Two pipe wrenches are required when installing gas piping. The gas pipe that is supplied with the heater MUST be held with a pipe wrench to prevent damage to the heater. LDAP-IOM (01-22) 207733-A...

  • Page 17: Venting Connections

    • A properly sized vent system is required for safe operation of the heater. An improperly sized vent system can cause unsafe conditions and/or create condensation. • Do not intermix different vent system parts from different manufacturers in the same venting system. • Do not vent into an existing gravity vent or chimney. LDAP-IOM (01-22) 207733-A...

  • Page 18: Venting Requirements

    • Venting must be in accordance with local codes and with the National Fuel Gas Code Z223 .1 . Local requirements supersede national requirements . • Model LDAP heaters are certified as Category III heaters . Refer to Table 9 for a list of Category III vent manufacturers .

  • Page 19: Vent Pipe Type

    . Work quickly to assemble components before sealant dries . NOTE: A double-wall pipe run is allowed only if at least 75% of the vent length is vertical. LDAP-IOM (01-22) 207733-A...
  • Page 20 Drill three small holes through the pipe and into collar venter outlet collar. spaced equally around pipe below sealant ring. Secure joint using 3/4-inch-long sheet metal screws. Do not overtighten screws. Figure 10. Instructions for Attaching Double-Wall Type B Vent Pipe to Single-Wall Pipe LDAP-IOM (01-22) 207733-A...

  • Page 21: Condensation Mitigation

    • Terminate the vent pipe with an option CC1 vent cap that is the same diameter as the vent pipe . • Install the horizontal vent terminal in accordance with Figure 11 . Refer to Table 11 for horizontal vent terminal clearance requirements . • Install the vertical vent terminal in accordance with Figure 12 . LDAP-IOM (01-22) 207733-A...
  • Page 22 7 (2 .1) above Grade (ground level) 3 (0 .9) above Does not apply to the inlet of a direct vent appliance . Do not terminate the vent directly above a gas meter or service regulator . LDAP-IOM (01-22) 207733-A...

  • Page 23: Electrical Connections

    Reznor (option CC1) vent cap Double-wall or Category III vent pipe Figure 12. Vertical Vent Terminal Electrical Connections ⚠ CAUTION ⚠ • Route wires so that they do not contact the flue wrapper or venter housing. • If any of the original wire supplied with the appliance must be replaced, it must be replaced with wiring material having a temperature rating of at least 105°C except for limit control, high limit...

  • Page 24: Disconnect Switch Wiring

    . The hot wire must be connected to terminal L1 on the circuit board . Control Plug Fuse Spark Thermostat Transformer Connections LED Status Lights Figure 14. Circuit Board (DSI Control Module) LDAP-IOM (01-22) 207733-A...

  • Page 25: Fan Motor Wiring

    • Each option package includes illustrated installation instructions. All Model LDAP heaters have discharge louvers but are available with additional louvers and/or nozzle discharge air options . Optional louver and discharge nozzles are shipped separately for field installation . Heat sections on unit sizes 800 and 1200 have independent airflow and do not require the same discharge options .

  • Page 26: Controls

    . Each section in the heater has a pressure switch . In addition, heaters with more than one heat section (unit sizes 800 and 1200) have a flue collection box section pressure switch that senses the negative pressure in the main venter housing . LDAP-IOM (01-22) 207733-A...

  • Page 27: High Temperature Limit Controls

    . If the setpoint is reached, the control interrupts the electric supply to the gas valve in that heat section . If the control activates, identify and correct the cause before resetting the switch (refer to TROUBLESHOOTING section) . LDAP-IOM (01-22) 207733-A...

  • Page 28: Combination Gas Valve

    . Switching the blue (medium speed) and red (low speed) fan motor wires on each heat section will change the fan motor(s) speed . Refer to the wiring diagram for the wire locations . LDAP-IOM (01-22) 207733-A...

  • Page 29: Operation

    ‰ Check polarity—verify that line voltage exists between black L1 wire and earth ground Pressure ‰ If installation elevation is >6,000 feet (>1,830 meters), replace pressure switch in accordance with Switch Replacement section LDAP-IOM (01-22) 207733-A...

  • Page 30: Startup

    . If heater operates, thermostat calls for heat, which energizes venter motor . 10 . Pressure switches close, which fires unit . 11 . Burner flame is sensed and in 30 seconds after gas valve is energized, fan motor(s) is energized . LDAP-IOM (01-22) 207733-A...

  • Page 31: Operating Sequences

    Control de-energizes gas valve and proceeds to steps 6 and 7 6 . Post-purge Venter motor remains on for 45-second post-purge period Thermostat is satisfied 7 . Fan OFF Fan motor is de-energized after selected fan OFF delay delay LDAP-IOM (01-22) 207733-A...
  • Page 32 Fan remains energized as long as call for fan remains without call for heat Fan is de-energized 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) . LDAP-IOM (01-22) 207733-A...

  • Page 33: Vent System Testing

    8 . After it has been determined that each heater connected to vent system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers, and any other gas-burning appliance to their previous condition of use . 9 . If improper venting is observed during above tests, vent system must be corrected . LDAP-IOM (01-22) 207733-A...

  • Page 34: 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 17. Pressure Switch LDAP-IOM (01-22) 207733-A...

  • Page 35: 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 size 400 equipped with two-stage valve, disconnect wire from the HI terminal on valve . Be sure to reconnect wire . LDAP-IOM (01-22) 207733-A...
  • Page 36 2 .6 7 .4 1 .3 4 .2 7001–8000 2136–2440 2 .5 7 .1 1 .3 4 .0 8001–9000 2441–2745 2 .4 6 .7 1 .2 3 .8 9001–10,000 2746–3045 2 .4 6 .7 1 .3 3 .6 LDAP-IOM (01-22) 207733-A...

  • Page 37: Measure And Adjust Manifold Gas Pressure-Elevation >2,000 Feet (>610 Meters)

    . 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 . 13 . Observe heater operation for at least one complete cycle to check for safe and proper operation . LDAP-IOM (01-22) 207733-A...

  • Page 38: Maintenance

    • If any of the original wire supplied with the appliance must be replaced, it must be replaced with wiring material having a temperature rating of at least 105°C, except for limit control, flame rollout, and sensor lead wires which must be rated at 150°C. • If replacement parts are required, use only factory-authorized parts. LDAP-IOM (01-22) 207733-A...

  • Page 39: Service Checklist

    . While holding venturi tube, slide entire burner assembly slightly upward to disengage burner from supports on bottom . e . Rotate open end of venturi tube outward toward access door opening and carefully pull burner assembly out of cabinet . LDAP-IOM (01-22) 207733-A...

  • Page 40: Burner Orifice Maintenance

    BTUh content and specific gravity of gas as well as the model and serial number of the unit . When removing or replacing the burner orifice, use two wrenches and take care not to damage the venturi tube and/or the bracket . LDAP-IOM (01-22) 207733-A...

  • Page 41: Heat Exchanger Maintenance

    2 . Remove access panel and disconnect fan motor wires, capacitor wires at capacitor, and ground screw . 3 . Remove assembled parts (fan guard, motor, and fan blade) . 4 . Disassemble and replace part(s) as needed . LDAP-IOM (01-22) 207733-A...

  • Page 42: Combination Gas Valve Maintenance

    4 . Use finger to fully block main burner orifice for several seconds . 5 . Observe manometer with orifice blocked . If any pressure is indicated, gas valve is leaking . 6 . Replace leaking gas valve before heater is restored to operation . LDAP-IOM (01-22) 207733-A...

  • Page 43: Venter Motor And Wheel Assembly Maintenance

    Wheel 1-1/4” (32mm) Spacing for Flue Assembled Venter Collection Venter Motor and Wheel Motor and Wheel Assembly Screw Flat Washer 7/16" (11 mm) inside Hex Nut DETAIL A DETAIL B Figure 21. Venter Motor and Wheel Assemblies LDAP-IOM (01-22) 207733-A...

  • Page 44: Pressure Switch Maintenance

    Check the complete vent system at least once a year . Inspection should include all joints, seams, and the vent terminal cap . Clean all openings and replace any defective parts . TROUBLESHOOTING General Troubleshooting Refer to Table 19 for general troubleshooting symptoms, probable causes, and remedies . LDAP-IOM (01-22) 207733-A...
  • Page 45 Ensure that flame sensor lead is not grounded or that sensor insulation or ceramic is not cracked—replace as required 8 . Cracked ceramic at sensor Replace sensor 9 . Incorrect polarity Reverse line volt leads to integrated circuit board LDAP-IOM (01-22) 207733-A...

  • Page 46: Unit Troubleshooting Using Dsi Control Module

    Four flashes energized Steady OFF Blown fuse, no power, or defective board Steady ON Flame is sensed Yellow Slow flash Weak flame—current below 1 .0 microamps ±50% Fast flash Undesired flame—valve open and no call for heat LDAP-IOM (01-22) 207733-A...
  • Page 47 Figure 23. DSI Control Module Troubleshooting Flowchart LDAP-IOM (01-22) 207733-A...

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

    For more information, contact your Factory Representative. Specifications and illustrations subject to change without notice or incurring obligations . Latest version of this manual is available at www.reznorhvac.com . ©2022 Nortek Global HVAC LLC, O’Fallon, MO . All rights reserved . LDAP-IOM (01-22) 207733-A...

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