your Lennox dealer for an inspection by a licensed profes- sional service technician (or equivalent).

DANGER

Danger of explosion.

There are circumstances in which odorant used with LP/propane gas can lose its scent. In case of a leak, LP/propane gas will settle close to the floor and may be difficult to smell. An LP/propane leak detector should be installed in all LP applications.

Do not attempt to bleed the gas lines of air. Call your local gas provider.

Start−Up & Operation Information

WARNING

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

BEFORE PLACING THE UNIT INTO OPERATION, 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.

The gas valve on the 180DFE will be equipped with a gas control switch. Use only your hand to move the switch. Never use tools. If the switch will not move by hand, do not try to repair it. Call a licensed professional service technician (or equivalent). Force or attempted repair may result in a fire or explosion.

Placing the ML180DFE furnace into operation: ML180DFE units are equipped with an ignition system. Do not attempt to manually light burners on this furnace. Each time the 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 this ignition system. Operating the Gas Valve (Figure 2)

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

2 − Set the thermostat to the lowest setting.

3 − Turn off all electrical power to the unit.

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 heating access panel.

6 − Move switch on gas valve to OFF. See figure 2.

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 − Move switch on gas valve to ON. See figure 2.

MANIFOLD

MANIFOLD

PRESSURE

PRESSURE

ADJUSTMENT

OUTLET

SCREW

 

INLET

 

PRESSURE PORT

 

GAS VALVE SHOWN IN ON POSITION

 

FIGURE 2

9 − Replace the heating 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 urning Off Gas to the Unit" and call your licensed professional service technician (or equivalent).

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 heating access panel.

4 − Move switch on gas valve OFF.

5 − Replace the upper access panel.

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Lennox International Inc ML180DFE SERIES manual Start−Up & Operation Information
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ML180DFE SERIES specifications

Lennox International Inc. is recognized for its innovative heating and cooling solutions, and the ML180DFE series is no exception. This high-efficiency gas furnace represents a significant leap in residential heating technology, designed to provide optimal home comfort while maximizing energy savings.

At the core of the ML180DFE series is its superior efficiency rating of up to 80% Annual Fuel Utilization Efficiency (AFUE). This ensures that a higher proportion of the fuel consumed is converted into heat for the home, minimizing waste and lowering energy bills. Homeowners can appreciate the tangible financial benefits of this efficiency, especially in areas with colder climates where heating costs can rise dramatically.

One of the standout features of the ML180DFE series is its two-stage heating capability. This technology enables the furnace to operate at two different levels of heat output, allowing it to adjust to the heating demands of the home more effectively. By running at a lower capacity on mild days and boosting to full capacity during extreme cold, the furnace delivers more consistent indoor temperatures and reduces the frequent on-and-off cycling that can wear out the system over time.

The ML180DFE series also utilizes a high-efficiency DC motor. This motor not only improves energy efficiency but also enhances the overall comfort of the home. It operates quietly, ensuring minimal disruption while providing reliable heat.

Safety is always a priority with Lennox products, and the ML180DFE series includes a range of safety features. These include a robust heat exchanger designed to withstand high temperatures and a safety shut-off system that reacts in case of any operational irregularities, offering peace of mind for homeowners.

The unit is also designed for easy installation and serviceability, featuring a durable cabinet and accessible components for routine maintenance. Lennox ensures that customers aren’t just buying a furnace, but a long-term heating solution that will serve them well for years to come.

In conclusion, the Lennox ML180DFE series is an excellent choice for homeowners seeking a reliable, efficient, and safe heating solution. With its two-stage heating, high-efficiency ratings, and advanced technologies, this furnace embodies the company’s commitment to quality and innovation, ensuring comfort and satisfaction in every home.
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