Carrier P421-4006 Thermistor Start Kit 318973-401 this automatic reset limit switch

this automatic reset limit switch is a direct replacement for legacy part numbers 18J3701 and 60T81

though it can be field-adjusted using the internal set screw to meet your specific pilot pressure needs

When transitioning between refrigerants

Can this module replace 24V DSI controls

Common Questions Is the Alco BFK163S compatible with R-410A systems

Carrier P421-4006 Thermistor Start Kit 318973-401 this automatic reset limit switchAs an essential component for high performance service, the Carrier P421 4006 Thermistor Start Kit (OEM Totaline) is the industry standard solution for technicians managing compressor reliability. This 25 Ohm PTC device is engineered to provide the critical additional starting torque required for heavy duty HVAC compressors, effectively acting as a soft start kit to mitigate high inrush current. By connecting in parallel to the run capacitor, it