This aluminum-bodied

Common Questions & Troubleshooting What does Carrier Error Code 34 mean

The isolated coil on this model means there is no internal connection between the coil circuit and the mounting bracket

The internal SW1 switch allows you to toggle between heating or cooling modes

but you should verify your specific unit's wiring schematic to ensure proper low-voltage terminal alignment

McDonnell & Miller FS5-D-3/4 Switch 30067439-890 This aluminum-bodied3 4" NPT In Line General Purpose Flow Switch with Two Snap Acting SPDT Switch (Part Number 114763) FS5 D 3 4 is the direct replacement for FS5 3 4 (EXTRA SWITCH)