For the M611 series

the Maxitrol MR212DH-1212 is the standard for high-capacity flow control in direct fired burners

using this precise thermal limit switch ensures the equipment operates within factory specifications

it can safely be used in systems requiring 370V

As a critical draft inducer assembly component

Lennox 71W44 Limit Switch 319825-402 For the M611 seriesThe Lennox 71W44 Limit Switch is a critical OEM safety component engineered for precise thermal regulation in residential gas furnaces and air handlers. This L145 30F limit switch is designed to monitor discharge air temperatures, automatically breaking the electrical circuit if the internal plenum temperature exceeds the 145F safety threshold. Once the system cools to 115F, the switch features an automatic reset function to restore operation without