1. Introducción
The Reznor UDXC-45 is a 45,000 BTU natural gas unit heater designed for indoor use in various spaces, including commercial, industrial, and residential garages, workshops, and warehouses. This manual provides essential information for the safe and efficient installation, operation, and maintenance of your heater. Please read all instructions thoroughly before proceeding with installation or operation.
2. Información de seguridad
ADVERTENCIA: La instalación, el ajuste, la alteración, el servicio o el mantenimiento inadecuados pueden causar daños a la propiedad, lesiones o la muerte. Lea completamente las instrucciones de instalación, operación y mantenimiento antes de instalar o reparar este equipo.
- Suministro de gas: Ensure the gas supply is turned off before any installation or maintenance. All gas connections must be leak-tested.
- Ventilación: Proper venting is critical to prevent carbon monoxide poisoning. Ensure the vertical Category 1 B-vent kit is installed correctly and maintained.
- Conexiones eléctricas: All electrical wiring must comply with local codes and be performed by a qualified electrician. Disconnect power before servicing.
- Espacios libres: Mantenga distancias adecuadas con respecto a los materiales combustibles según lo especificado en las instrucciones de instalación.
- Instalación profesional: Installation and service should be performed by a qualified installer, service agency, or gas supplier.
3. Producto terminadoview
The Reznor UDXC-45 unit heater is engineered for durability and efficient heating. It features a robust design suitable for demanding environments.

Imagen: Frente view of the Reznor UDXC-45 unit heater highlighting standard features such as 83% AFUE efficiency and TCORE2 heat exchanger.
Características principales:
- Rendimiento alto: Rated for 45,000 BTU with an 83% thermal efficiency rating.
- Construcción duradera: Cuenta con un intercambiador de calor de acero aluminizado estabilizado con titanio TCORE2.
- Encendido avanzado: Combustión patentada de un solo quemador con encendido por chispa directa de múltiples intentos y bloqueo de tiempo.
- Interfaz de usuario: Integrated circuit board with a 7-segment display for troubleshooting and status-indicating LED.
- Funcionamiento silencioso: Low noise operation with vibration-isolated fan and venter motors.
- Flexibilidad de instalación: Retenedores de tuercas roscadas en cuatro puntos de suspensión para montaje en techo o pared (los accesorios de montaje se venden por separado).
- Acceso de mantenimiento: Hinged access door panel with a quarter-turn latch and external gas connection for ease of maintenance.

Image: Visual representation of the heater's attributes including scratch resistance, durable build, modern design, and quiet operation.
4. Especificaciones
Detailed technical specifications for the Reznor UDXC-45 unit heater.

Image: Diagram illustrating the physical dimensions of the 45,000 BTU Reznor UDXC-45 heater.
| Especificación | Valor |
|---|---|
| Número de modelo | UDXC-45 |
| Salida de calor | 45,000 unidades térmicas británicas (BTU) |
| Eficiencia térmica | 83% |
| Tipo de combustible | Gas natural |
| Método de calentamiento | Aire forzado |
| Uso en interiores y exteriores | Interior |
| Factor de forma | Techo montado |
| Dimensiones del producto (Pr. x An. x Al.) | 29.75" x 27" x 13.75" |
| Número de velocidades | 2 |
5. Instalación
The Reznor UDXC-45 is designed for ceiling or wall mounting. A vertical Category 1 double wall B-vent kit is included for roof venting. Consult a qualified professional for installation to ensure compliance with all local codes and safety standards.
Montaje:
- The unit features threaded-nut retainers at four suspension points for secure mounting.
- Mounting hardware is sold separately and should be selected based on the specific installation environment and structural requirements.
- Ensure the mounting location can support the weight of the unit and provides adequate clearance from combustible surfaces.

Image: A Reznor UDXC-45 heater mounted on a ceiling, demonstrating a typical installation in a garage or workshop setting.
Desfogue:
The included vertical Category 1 double wall B-vent kit is essential for safely expelling combustion byproducts. Follow the kit's instructions and local codes for proper installation.
- The kit typically includes components such as a Reznor CCI Vent Cap, Draft Hood Connector, Straight Pipes (12" and 24" lengths), Adjustable Elbows (60° and 90°), Roof Flashing, and a Storm Collar.
- Ensure all vent connections are sealed properly to prevent leaks.

Image: Various components of a 4-inch diameter double wall B-vent kit, used for vertical venting applications.
6. Operación
Once properly installed and connected to the natural gas and electrical supplies, the Reznor UDXC-45 heater is ready for operation. This unit utilizes forced air for efficient heat distribution.
Cómo poner en marcha el calentador:
- Asegúrese de que la válvula de suministro de gas al calentador esté abierta.
- Encienda la energía eléctrica a la unidad.
- Ajuste el termostato a la temperatura deseada. El calentador iniciará la secuencia de encendido.
- Observe the status-indicating LED and 7-segment display for operational status.
Circulación de aire:
The low static pressure axial fan and power venting system are designed to reduce heat loss and ensure effective air circulation throughout the heated space.

Image: A diagram showing the air circulation patterns generated by a unit heater, indicating effective heat distribution.
7. Mantenimiento
Regular maintenance ensures the longevity and efficient operation of your Reznor UDXC-45 heater. Always disconnect electrical power and turn off the gas supply before performing any maintenance.
- Inspección anual: Have a qualified service technician inspect the heater annually, including the heat exchanger, burner, ignition system, and venting.
- Limpieza: Keep the area around the heater clean and free of obstructions. Periodically clean the fan blades and motor to prevent dust buildup.
- Comprobación del sistema de ventilación: Inspect the vent system for any signs of corrosion, blockages, or leaks. Ensure the vent cap is clear.
- Intercambiador de calor: The TCORE2 titanium-stabilized aluminized steel heat exchanger is designed for durability, but should be inspected for any signs of damage or wear during annual service.
8. Solución de problemas
The Reznor UDXC-45 is equipped with an integrated circuit board and a 7-segment display for diagnostics, along with a status-indicating LED to assist in troubleshooting. Refer to the specific error codes displayed on the 7-segment display for detailed guidance.
Problemas comunes:
- Sin calor: Check if the thermostat is set correctly, the gas supply is open, and the electrical power is on. Look for error codes on the display.
- Pilot Light/Ignition Failure: The multi-try direct spark ignition system will attempt to light the burner multiple times. If it fails, an error code will be displayed. This may indicate a gas supply issue or a problem with the ignition components.
- Ruidos inusuales: While designed for quiet operation, any new or unusual noises should be investigated. This could indicate a fan issue or other mechanical problem.
- Heater Cycles On/Off Frequently: This could be due to an improperly sized unit, thermostat placement, or airflow restrictions.
For persistent issues or complex problems, contact a qualified service technician.
9. Garantía y soporte
For warranty information, please refer to the documentation provided with your Reznor UDXC-45 unit heater or contact the manufacturer directly. Support for this product may also be available through the seller, 1HVAC. Keep your purchase receipt and model number (UDXC-45) handy when contacting support.





