Automatic Reset: Eliminates nuisance manual resets by restoring the circuit once temperatures drop below the 140°F cutout threshold

the 20269903 limit switch likely needs replacement

including glycol solutions up to 60%

It will close the circuit on its own once the temperature drops 20 degrees below the 220

Supco SHP400280 Pressure Switch Els PW 17895 Automatic Reset: Eliminates nuisance manualThe Supco SHP400280 is a heavy duty, commercial grade high pressure switch engineered for precision system protection in HVAC and refrigeration equipment. Designed as a single pole single throw (SPST) control, this encapsulated switch features a critical 400 PSI cut out (open) and a 280 PSI cut in (close), providing an automatic reset function once head pressures stabilize. As a professional tier HVAC pressure control, the SHP400280 utilizes a