Capacitors have insulated terminals, but you should still avoid touching the metal contacts. There are typically two types: the run capacitor, which remains engaged to improve motor efficiency and torque during operation, and the start capacitor, which is only used for a few seconds during startup.
How to Check Wire Polarity on HVAC Capacitors
Look for three terminals on the wiring diagram, usually labeled "C" (Common), "FAN" (or "H"), and "HERM" (or "R"). You must replace it with a new unit that matches these specifications exactly, typically 5μF to 7μF for outdoor units and 3-5μF for fan circuits.
Final Checks and Testing. Take the new capacitor and connect the wires exactly as they were on the old one.
How to Check and Connect Wire Polarity on HVAC Capacitors
Locate the dedicated circuit breaker for the HVAC unit in the main electrical panel and switch it to the "Off" position. HVAC units rely on motors that require more initial torque to start than they need to keep running.
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