Thermostats

The gas valve on the G40DF(X) will be equipped with ei, ther a gas control knob or lever. Use only your hand to turn the gas control knob or push the gas lever. Never use tools. If the knob or lever will not move by hand, do not try to repair it. Call a qualified service technician. Force or at, tempted repair may result in a fire or explosion.

Placing the G40DF(X) furnace into operation: G40DF(X) units are equipped with a SureLightt ignition system. Do not attempt to manually light burners on these furnaces. Each time thermostat calls for heat, the burners will automatically light. The ignitor does not get hot when there is no call for heat on units with the SureLightt ignition system.

Operating the Gas Valve (Figures 3, 4 and 5)

1 - STOP! Read the safety information at the beginning of this section.

2 - Set the thermostat to the lowest setting. See figure 2. 3 - Turn off all electrical power to the unit.

FIGURE 2

4 - This furnace is equipped with an ignition device which automatically lights the burners. Do not try to light the burners by hand.

5 - Remove the lower access panel.

6 - White Rodgers 36E/36F Gas Valve - Switch gas valve lever to OFF.

Honeywell VR8205 Gas Valve - Turn knob on gas valve clockwise to OFF. Do not force. See figure 5.

7 - Wait five minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instruc, tions. If you do not smell gas go to next step.

8 - White Rodgers 36E/36F Gas Valve - Switch gas valve le, ver to ON. See figure 3 for the White Rodgers 36E valve and figure 4 for the White Rodgers 36F valve.

Honeywell VR8205 Gas Valve - Turn knob on gas valve

counterclockwise to ON. Do not force.

White Rodgers 36E Series Gas Valve

Gas

Valve

Lever

GAS VALVE SHOWN IN OFF POSITION

FIGURE 3

White Rodgers 36F Series Gas Valve

Gas

Valve

Lever

GAS VALVE SHOWN IN OFF POSITION

FIGURE 4

Honeywell VR8205 Series Gas Valve

Gas

Valve Knob

OFF

GAS VALVE SHOWN IN OFF POSITION

FIGURE 5

9 - Replace the lower access panel.

10 - Turn on all electrical power to to the unit.

11 - Set the thermostat to desired setting.

NOTE - When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.

12- If the appliance will not operate, follow the section •Turning Off Gas to the Unit" and call your service tech, nician or gas supplier.

Turning Off Gas to the Unit

1 - Set the thermostat to the lowest setting.

2 - Turn off all electrical power to the unit if service is to be performed.

3 - Remove the lower access panel.

Page 4

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.