Universal Refrigerant Compatibility: Supports a comprehensive range of traditional and A2L refrigerants including R410A

How do I know if my PTAC thermistor is bad

fitting a wide array of residential and commercial compressor models

and debris that compromise system calibration

Ensure the threaded nut is snug and the mica insulation remains intact

Lennox 99K63 Rollout Switch Universal Refrigerant Compatibility: Supports aThe Lennox 99K63 Rollout Switch is a critical safety component designed for precise thermal monitoring in residential and commercial gas furnaces. Engineered as a manual reset rollout switch, this part is calibrated to actuate at 250 degrees F (+ 12F), immediately interrupting the burner circuit if it detects flame rollout or excessive heat concentrations outside the combustion chamber. This OEM Lennox replacement part, also identified by part number