Important Directions

WARNING

Do not use this furnace if any part has been under water. Immediately call a qualified service technician to inspect the furnace and to replace any part of the control system and any gas control which has been under water.

Your furnace is a gas appliance. It is critical that the gas supplied to the unit be completely burned to avoid the pro, duction of carbon monoxide gas. Complete combustion of the gas requires, but is not limited to, correct gas pressure and gas flow rate, adequate combustion, air, and proper venting.

IMPORTANT

Any additions, changes, or conversions required in order for the appliance to satisfactorily meet the ap0 plication needs must be made by a Lennox service technician using factory specified and approved parts.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage, person0 al injury or loss of life. Installation and service must be performed by a qualified installer, service agency or the gas supplier.

1 - Keep the furnace area clear and free of combustible material, gasoline, and other flammable vapors and liquids. If it is installed in an insulated area, the furnace must be kept free of insulating material. Insulating ma, terial may be combustible.

2 - DO NOT obstruct air flow to unit. Unit must receive an unobstructed flow of combustion and ventilating air.

3 - DO NOT store chlorine or fluorine products near unit or introduce these products into the combustion air. These products can cause furnace corrosion.

4 - DO NOT draw return air from a room where this fur0 nace, or any other gas appliance (ie., a water heat0 er), is installed. When return air is drawn from a room, a negative pressure is created in the room. If a gas ap, pliance is operating in a room with negative pressure, the flue products can be pulled back down the vent pipe and into the room. This reverse flow of the flue gas may result in incomplete combustion and the formation of carbon monoxide gas. This toxic gas might then be distributed throughout the house by the furnace duct system.

WARNING

The blower door and flue chase must be securely in place when the blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into the living space resulting in per0 sonal injury or death.

WARNING

Carbon monoxide gas is invisible, odorless and toxic.

Exposure to carbon monoxide gas can cause personal inju, ry and even death to all occupants, including pets. Any item that is powered by or gives off heat from a combustion pro, cess (including lawn mowers, automobiles, and fireplaces) has the potential to produce carbon monoxide gas. Because of this, Lennox recommends the use of a carbon monox0 ide detector in your home, even if you do not own gas appliances. When propane is used, Lennox also recom, mends use of a propane detector. Reliable detectors are available at reasonable retail prices. Contact your Lennox dealer or propane supplier for more details about this in, vestment in your safety.

Your furnace is designed to meet standards set by nation, al agencies, and to operate safely when properly installed and maintained. However, the unit's performance can be greatly impacted by the individual installation and the op, erating environment. It is your responsibility to ensure that this appliance is maintained. Proper maintenance is criti, cal for your safety and the satisfactory operation of the product. Lennox strongly recommends annual in0 spection and maintenance of this appliance. Contact your Lennox dealer for an inspection by a qualified service technician.

Lighting Information & Operation

WARNING

If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or death.

BEFORE LIGHTING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.

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G40DF(X) SERIES specifications

Lennox International Inc. is renowned for its innovative HVAC solutions, and the G40DF(X) Series stands out as a significant breakthrough in the realm of gas furnaces. Designed for efficiency and reliability, the G40DF(X) Series is a product that embodies Lennox's commitment to performance, comfort, and sustainability.

One of the main features of the G40DF(X) Series is its efficiency rating. With an Annual Fuel Utilization Efficiency (AFUE) of up to 97%, this furnace is designed to maximize energy usage while minimizing waste. This high efficiency not only helps homeowners save on utility bills but also contributes to a reduced carbon footprint. The furnace's ability to convert more fuel into usable heat makes it a smart choice for anyone looking to upgrade their heating system.

The G40DF(X) Series also incorporates advanced technology to enhance its performance. One notable feature is the use of a two-stage heating process, which allows the furnace to adjust its output based on the current heating demand. By operating at a lower capacity during milder weather, the furnace provides a more consistent and comfortable temperature while using less energy. This staged heating capability reduces wear and tear on the unit, leading to increased longevity and fewer repair needs.

In addition to energy efficiency, the G40DF(X) Series prioritizes quiet operation. The advanced sound-dampening technology minimizes operational noise, ensuring that homeowners can enjoy a peaceful indoor environment. This is particularly beneficial for those living in close quarters or for families with young children who may be sensitive to noise.

Lennox also emphasizes safety in the design of the G40DF(X) Series. The furnace includes several safety features, such as an integrated pressure switch that monitors venting pressure to ensure proper operation. A reliable ignition system further enhances safety, preventing issues that can arise from faulty ignition and maintaining consistent performance.

The compact size of the G40DF(X) Series allows for flexible installation options, whether in a basement, attic, or closet. This adaptability makes it a suitable option for various home layouts. Additionally, Lennox offers a warranty on the furnace, providing peace of mind for homeowners regarding their investment.

In summary, Lennox International Inc.'s G40DF(X) Series is a top-tier gas furnace characterized by high efficiency, advanced technology, quiet operation, and built-in safety features. As a reliable heating solution, it meets the demands of modern homeowners while promoting energy conservation and comfort. With the G40DF(X) Series, Lennox continues to lead the way in HVAC innovation, ensuring that customers receive superior products that enhance their living environments.