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Bard part 8402-137 is an OEM limit control used in Bard HVAC equipment to help protect the system by opening the control circuit when temperatures rise beyond the switch setting, then allowing normal operation to resume as temperatures drop back into range. This line break style limit control is commonly applied in safety and temperature management functions, helping prevent overheating conditions that can shut down heating operation or damage components. For best results, match the temperature ratings to your original control (often referenced as L170 to L200) and confirm compatibility by checking your unit model and wiring layout before ordering.