1. Introducción
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Duluth Forge DLS-18T-1 Dual Fuel Ventless Fireplace Logs Set. Please read all instructions carefully before installation and use. Retain this manual for future reference.

Image 1.1: The Duluth Forge DLS-18T-1 Dual Fuel Ventless Fireplace Logs Set in operation.
2. Información de seguridad
ADVERTENCIA: La instalación, el ajuste, la alteración, el servicio o el mantenimiento incorrectos pueden causar lesiones o daños materiales. Consulte este manual. Para obtener ayuda o información adicional, consulte a un instalador cualificado, una agencia de servicio técnico o la empresa de gas.
- Este aparato es solo para uso en interiores.
- No almacene ni utilice gasolina u otros vapores y líquidos inflamables cerca de este o cualquier otro aparato.
- The Oxygen Depletion Sensor (ODS) is a safety feature that automatically shuts off the gas supply if oxygen levels in the room fall below a safe threshold. Do not tamper con o sin el ODS.
- Ensure adequate ventilation as specified in local codes and this manual.
- Tamaño mínimo de caja de fuego requerido: 20” de alto x 29” de ancho en el frente (22” de ancho en la parte trasera) x 13” de profundidad.
- Mantenga a los niños y a las mascotas alejados del aparato cuando esté en funcionamiento.
3. Características del producto
- Tecnología de combustible dual: Operates with either Natural Gas or Liquid Propane.
- Alta producción de calor: 30,000 BTU, capaz de calentar hasta 1,000 pies cuadrados.
- Diseño sin ventilación: 99.9% efficient, no outside duct or chimney required.
- Control del termostato: Automatically cycles the burner to maintain a desired room temperature.
- Registros realistas: 8 hand-painted ceramic logs designed to emulate a split red oak wood fire.
- Garantía de seguridad: Equipped with a Safety Pilot O.D.S. (Oxygen Depletion Sensor) with automatic shut-off.
- Encendido fácil: Battery-assisted Piezo ignition (requires 1 AAA Battery, included).

Imagen 3.1: Detallada view of the ceramic logs and flames.
4. Contenido del paquete
Al desembalar, asegúrese de que estén presentes todos los componentes siguientes:
- Conjunto de quemador de gas
- 8 troncos de cerámica pintados a mano
- Rejilla de hierro
- U-Burner Chassis
- Unidad de control del termostato
- Oxygen Depletion Sensor (integrated)
- Batería 1 AAA
- Paquete de hardware

Image 4.1: All components included in the Duluth Forge DLS-18T-1 package.
5. Instalación y configuración
Installation should be performed by a qualified professional in accordance with all local codes and the provided instructions. This appliance must be installed in a masonry or agency-approved firebox.
5.1 Comprobaciones previas a la instalación
- Verify that the firebox meets the minimum size requirements: 20” H x 29” W in front (22” W at rear) x 13” D.
- Ensure the gas supply type (Natural Gas or Liquid Propane) matches the appliance’s configuration. The patented Dual Fuel Technology allows conversion, but it must be correctly set for your gas type.
- Confirm that the area has adequate ventilation.
5.2 Ubicación de los componentes
- Carefully place the burner assembly and iron grate within the firebox.
- Arrange the ceramic logs according to the detailed log placement instructions provided with the hardware pack. Proper log placement is crucial for flame appearance and safe operation.
- Connect the gas line to the burner assembly. This step requires professional expertise.

Image 5.1: The gas log set properly installed within a fireplace.
6. Instrucciones de funcionamiento
6.1 Initial Ignition
- Asegúrese de que la válvula de suministro de gas esté abierta.
- Insert the included AAA battery into the Piezo ignition unit.
- Turn the control knob to the 'Pilot' position and depress it.
- While holding the knob down, press the Piezo ignitor button repeatedly until the pilot flame ignites. Continue to hold the control knob down for approximately 30-60 seconds after ignition to allow the thermocouple to heat up.
- Release the control knob. If the pilot flame extinguishes, repeat the process.
6.2 Main Burner Operation (Thermostat Control)
The thermostat control allows you to set a desired room temperature, and the unit will automatically cycle on and off to maintain it.
- Once the pilot is lit, turn the control knob from 'Pilot' to the desired heat setting (1-5).
- The main burner will ignite, and flames will appear among the logs.
- To adjust the temperature, rotate the control knob to a higher or lower setting. The unit will automatically regulate the flame to reach and maintain the set temperature.
- To turn off the main burner while keeping the pilot lit, turn the control knob to the 'Pilot' position.
- To completely turn off the unit, turn the control knob to the 'Off' position and close the main gas supply valve.

Image 6.1: Thermostat control and Piezo ignition for the log set.
7. Mantenimiento
Regular maintenance ensures safe and efficient operation of your fireplace logs set.
- Inspección anual: Have a qualified service technician inspect the burner assembly, gas connections, and logs annually.
- Limpieza: Keep the area around the appliance clear of combustible materials. Periodically clean the logs and burner area with a soft brush or vacuum cleaner to remove dust and debris. Ensure the unit is completely cool and the gas supply is off before cleaning.
- Estado del registro: Inspect logs for cracks or damage. Replace any damaged logs to maintain proper flame patterns and safety.
8. Solución de problemas
If you encounter issues, refer to the following common troubleshooting steps. For persistent problems, contact a qualified service technician.
8.1 Pilot Light Will Not Stay Lit
- Suministro de gas: Ensure the main gas supply valve is fully open.
- Par termoeléctrico: The thermocouple may not be heating sufficiently. Ensure the pilot flame is directly impinging on the thermocouple. Hold the control knob down for the recommended 30-60 seconds after ignition.
- ODS Activation: The Oxygen Depletion Sensor may have activated due to low oxygen levels. Ensure adequate ventilation in the room.
- Pilot Orifice: A clogged pilot orifice can cause a weak pilot flame. This requires professional cleaning.
8.2 Main Burner Does Not Ignite
- Pilot Lit: Confirm the pilot light is actively burning. The main burner will not ignite if the pilot is out.
- Control Knob Position: Ensure the control knob is turned to a numbered heat setting (1-5) and not just 'Pilot' or 'Off'.
- Presion del gas: Low gas pressure can prevent the main burner from igniting. Consult your gas supplier or a professional.
9. Especificaciones
| Atributo | Detalle |
|---|---|
| Marca | Fragua de Duluth |
| Nombre del modelo | Doble combustible |
| Número de modelo del artículo | DLS-18T-1-AZ |
| Fuente de poder | Alimentado por gas (gas natural o propano líquido) |
| Salida de calor | 30,000 unidades térmicas británicas (BTU) |
| Cobertura de calefacción | Hasta 1,000 pies cuadrados |
| Tipo de ventilación | Sin ventilación |
| Dimensiones del producto | 23.5" de profundidad x 15.5" de ancho x 18" de alto |
| Tamaño mínimo de la caja de fuego | 20” H x 29” W in front (22” W at rear) x 13” D |
| Material | Cerámico |
| Tipo de ignición | Battery-assisted Piezo (1 AAA Battery) |
| Características de seguridad | Sensor de agotamiento de oxígeno (ODS) |
| Peso del artículo | 23.9 libras (10.84 kilogramos) |

Image 9.1: Key dimensions of the Duluth Forge DLS-18T-1 log set.
10. Garantía y soporte
For warranty information and customer support, please refer to the documentation included with your product or contact Duluth Forge directly. You can also visit the official Duluth Forge store on Amazon for more information: Duluth Forge Amazon Store.