Lennox International Inc G40UH(X) manual Thermostats

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The gas valve on the G40UH(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 G40UH(X) furnace into operation:

G40UH(X) units are equipped with a SureLightZignition 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 SureLightZignition 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.

THERMOSTATS

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 upper access panel.

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

Honeywell VR8205 Gas Valve - Turn knob on gas

valve clockwiseto 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

MANIFOLD

PRESSURE

ADJUSTMENT

SCREW

MANIFOLD

PRESSURE

OUTLET

GAS VALVE SHOWN IN OFF POSITION

FIGURE 3

White Rodgers 36F Series Gas Valve

MANIFOLD

PRESSURE

ADJUSTMENT

SCREW

MANIFOLD

PRESSURE

OUTLET

GAS VALVE SHOWN IN OFF POSITION

FIGURE 4

Honeywell VR8205 Series Gas Valve

MANIFOLD

MANIFOLD

PRESSURE

PRESSURE

ADJUSTMENT

OUTLET

SCREW

 

 

ON

 

OFF

GAS VALVE SHOWN IN OFF POSITION

FIGURE 5

9 - Replace the upper 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 upper access panel.

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Contents Litho U.S.A What to do if YOU Smell GASG40UHX Parts Identification Spection and maintenance of this appliance. Contact Important DirectionsLighting Information & Operation Ide detector in your home, even if you do not own gasThermostats Service Reminder Safety PrecautionsFilters Seasonal InspectionsPlanned Service

G40UH(X) specifications

Lennox International Inc. has long been a recognized leader in the heating, ventilation, and air conditioning (HVAC) industry, providing customers with innovative, high-efficiency solutions. One of its standout products is the G40UH(X) series, a gas furnace that exemplifies modern engineering and energy efficiency. The Lennox G40UH(X) is designed to offer powerful heating capability while maintaining eco-friendly performance and reliability.

One of the main features of the G40UH(X) is its multi-speed blower motor, which not only enhances comfort levels but also operates quietly and efficiently. This furnace utilizes advanced technology to provide better airflow and even heating throughout the space, reducing temperature fluctuations and ensuring that every corner of a home remains comfortable regardless of external weather conditions.

The G40UH(X) series includes a variable-speed gas valve, allowing for precise control over heating output. This feature enables the furnace to adjust its heating capacity in response to the specific needs of the home, optimizing energy consumption and reducing utility costs. Its efficiency rating of up to 96% AFUE (Annual Fuel Utilization Efficiency) means that a significant majority of the energy consumed is effectively converted into heat, making it an environmentally friendly choice.

In terms of design, the G40UH(X) is compact and versatile, making it suitable for various home layouts. Its quiet operation is another significant benefit, as it is engineered to minimize noise, ensuring that it does not disrupt daily activities while efficiently heating the home.

Additional characteristics of the G40UH(X) include compatibility with the Lennox iComfort S30 Smart Thermostat. This integration allows homeowners to control the system remotely, optimizing performance and ensuring maximum comfort. Safety is also a top priority with features such as a secondary heat exchanger and an integrated carbon monoxide sensor, providing peace of mind to users.

Overall, the Lennox G40UH(X) gas furnace embodies quality, efficiency, and innovative design, making it a popular choice for homeowners looking to enhance their heating systems. With its combination of advanced technology, substantial performance, and user-friendly features, the G40UH(X) remains an ideal solution for modern indoor comfort.
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