As a veteran-grade refrigerant limit switch

The 'A' suffix typically denotes a minor manufacturing revision that does not affect field installation or compatibility

the oil-immersed gear train and motor within this spring return actuator ensure consistent lubrication and thermal regulation

ensuring a safe and consistent combustion air sequence

Carrier HH18HA137 Limit Switch 319848-301 As a veteran-grade refrigerant limitThe Carrier HH18HA137 Limit Switch is a critical safety component designed for precise thermal monitoring within furnace heat exchangers. This OEM Carrier replacement part features an automatic reset mechanism with a cutout temperature of 130F and a cut in differential at 90F. Engineered for high cycle reliability, the HH18HA137 limit control ensures the blower motor and burner assembly operate within safe thermal parameters, preventing structural