It is one of the most frequent causes of a problematic motor, fan, or unit as a whole, and, for this reason, knowing how to replace it yourself can save you from weeks without central air. An undersized capacitor won’t hurt your air conditioner, but it will shorten the capacitor’s life significantly. Remove any bolt holding the old capacitor in place. Turn off all power to the furnace. Beware: An AC capacitor stores voltage and could shock you! Disconnect the wiring. Do not touch the terminals. Before working on it, discharge the capacitor as shown below. Any capacitor with the same voltage and micro farads can be used interchangeably. An air conditioner capacitor is an important electrical device that can cause serious system problems if it malfunctions. The circuit required a very high voltage capacitor and so it used two 4.7uF 400V electrolytic capacitors in series, I replaced them with one 2.2uF 900V film capacitor. Safely Discharge the AC Capacitor Locate the capacitor usual close to the furnace motor. How Replace a Furnace Capacitor . If you decide to DIY this job, remember that bigger is better — if your air conditioner is a 370- volt unit, bumping up to a 400-volt capacitor will ensure you get enough power and it reaches its maximum life expectancy. To get to the capacitor, remove the compressor unit’s access panel as shown in the capacitor testing and replacement videos below. Take pictures of the wiring to reference back if needed.


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