Lennox 34M72 Low Ambient Pressure Switch Kit

The Lennox 34M72 is a low ambient control kit specially made for Lennox gas furnaces. It can experience a problem of sustained ignition because of the low temperatures in the environment. This kit meets that challenge by providing for correct operating conditions even in freezing conditions. It may include a fan control board, an outdoor thermostat and a wiring harness. The fan control board may change the fan operation to keep warmer temperatures around the furnace heat exchanger while the outdoor thermostat tracks the outside temperature and may change the furnace operation to assist ignition.