Observe how the wires are connected; take a photo or make a simple sketch for reference. Capacitors have insulated terminals, but you should still avoid touching the metal contacts.
Capacitor Wiring Hvac Safety Guide
Locate the dedicated circuit breaker for the HVAC unit in the main electrical panel and switch it to the "Off" position. 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.
Wiring a capacitor for HVAC applications is a fundamental skill for technicians and a common point of failure for homeowners. Place one probe on the ground wire and the other on each terminal (L1, L2, L3 if applicable).
Capacitor Wiring Hvac Safety Guide
Simply turning the thermostat to "Off" is insufficient. Look for three terminals on the wiring diagram, usually labeled "C" (Common), "FAN" (or "H"), and "HERM" (or "R").
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