Reznor UWS Installation, Operation And Maintenance Manual
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Reznor UWS Installation, Operation And Maintenance Manual

Hydronic unit heater
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HYDRONIC UNIT HEATER INSTALLATION, OPERATION,
AND MAINTENANCE
• Be sure to read and understand the installation, operation, and maintenance instructions in
this manual.
• 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.
• This appliance is not intended for use by persons with reduced physical, sensory, or mental
capabilities or lack of experience and knowledge, unless they have been given supervision
or instruction concerning use of the appliance by a person responsible for their safety.
• Children should be supervised to ensure that they do not play with the appliance.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
• Do not remove safety labels. If they are unreadable, contact an authorized distributor for
replacement labels.
• The heat exchanger coils must be protected against freezing.
DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
MODEL UWS
 ⚠ WARNING ⚠ 
Revision: UWS-IOM (09-24) 1042971-A
Supersedes: UWS-IOM (06-24) 1042971-0

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  • Page 1 Revision: UWS-IOM (09-24) 1042971-A Supersedes: UWS-IOM (06-24) 1042971-0 HYDRONIC UNIT HEATER INSTALLATION, OPERATION, AND MAINTENANCE MODEL UWS  ⚠ WARNING ⚠  • Be sure to read and understand the installation, operation, and maintenance instructions in this manual. • 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.

  • Page 2: Table Of Contents

    . Pay attention to all dangers, warnings, cautions, and notes highlighted in this manual . Safety markings should not be ignored and are used frequently throughout to designate a degree or level of seriousness . UWS-IOM (09-24) 1042971-A...

  • Page 3: Warranty

    • When heaters are located in the center of the space to be heated, the air should be discharged toward the exposed walls . In large areas, heaters should be located to discharge air along exposed walls with extra units provided to discharge air in toward the center of the area . UWS-IOM (09-24) 1042971-A...

  • Page 4: Mounting Height

    90°F (50°C) above the surrounding ambient temperature is not exceeded . Table 3. Clearances to Combustibles Heater Surface Minimum Clearance (Inches (mm)) Top, bottom, sides 0 (0) Rear (from fan motor) 18 (457) UWS-IOM (09-24) 1042971-A...

  • Page 5: Dimensions

    Dimensions TOP VIEW SIDE VIEW FRONT VIEW SUPPLY WIRING ENTRANCE REAR VIEW Figure 1. Dimensions (Refer to Table UWS-IOM (09-24) 1042971-A...

  • Page 6: Installation

    ‰ Check to see if there are any field-installed options (refer to to unit installation . Ensure that all options ordered are at the installation site . Instructions are in this manual or in the shipped-separate option package . UWS-IOM (09-24) 1042971-A...

  • Page 7: Heater Suspension

    • Flange seals must not be made with rubber or other material that melts easily. In the event of overheated water, rubber seals may melt. • Mount a thermostatic air vent if the distribution ring of the water or steam is in a lower position than the heater. UWS-IOM (09-24) 1042971-A...

  • Page 8: Electrical Connections

    Route the 115V supply wiring and any 115V control wiring through the wiring entrance shown in Figure 1 and make connections inside the electrical compartment . Be sure to close and secure the electrical compartment door . UWS-IOM (09-24) 1042971-A...

  • Page 9: Controls

    1 . Ensure that water supply and return valves are open . 2 . Set thermostat to desired setting . 3 . Turn ON electric power to heater . 4 . Observe startup sequence: fan is energized until thermostat’s call for heat is satisfied . UWS-IOM (09-24) 1042971-A...

  • Page 10: Maintenance

    7 . Position assembly on unit and secure fan guard . 8 . Rotate fan blade to check for adequate clearance . If adjustment is required, loosen mounting screws, reposition fan guard, and tighten screws to 30 inch-pounds . Repeat until assembly is positioned properly . UWS-IOM (09-24) 1042971-A...

  • Page 11: Troubleshooting

    1 . Low or high voltage supply Correct electric supply out on overload 2 . Defective capacitor Replace capacitor 3 . Defective fan motor Replace fan motor 4 . Poor airflow Clean motor, fan, and fan guard Adjust louvers UWS-IOM (09-24) 1042971-A...

  • Page 12: 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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