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The genuine OEM Lennox 44W17 low ambient kit (part reference LB-107318BA) extends the operating range of your Lennox condensing unit down to 0°F, enabling reliable mechanical cooling in cold outdoor conditions. The kit cycles or modulates the condenser fan to hold proper head pressure, which is critical for year-round cooling loads such as data closets, server rooms, and other continuous-cooling applications where the unit must run through the winter.
Common failure symptoms when a low ambient control is missing or failed include low-pressure lockouts in cold weather, the condenser fan running when it shouldn't, loss of cooling capacity as temperatures fall, coil frosting, and short cycling of the compressor.
Why OEM matters: the 44W17 kit is engineered for the specific pressure setpoints, fan motor, and wiring of compatible Lennox condensers, with a factory-rated 0°F low-temperature threshold. Aftermarket kits may control the fan at the wrong pressures and expose the compressor to slugging or damage. Install the Lennox-specified kit for correct fit, protected equipment, and dependable low-ambient cooling.