ActronAir Float Switch 1/4" Connection is a refrigerant-side float switch for ActronAir commercial and residential split ducted systems, detecting liquid refrigerant accumulation in the liquid line circuit to protect the compressor from liquid slugging damage in systems prone to refrigerant migration during off-cycle periods. Float switches of this type are fitted to specific commercial and large-residential applications where refrigerant migration risk is identified at installation -- their absence should be verified against the system's installation documentation before assuming a replacement is required. Isolate power and recover refrigerant before replacing any liquid-line protection components.