Note: Installing an HVAC surge protector can protect the AC and capacitors from power surges. The capacitor may lose the ability to store charge and start to degrade as a result of frequent power surges caused by unstable electric lines or power supply. Electrical OverloadĪn electrical overload requires a current greater than the AC capacitor’s capacity, which can cause the capacitor to fail. Or else, there can be chances of capacitor explosion. While replacing a capacitor, you must ensure that the specifications of the new capacitor match the old one. Read also: 25 Types of Capacitors & their Uses (Explained in detail) Improper voltage rating Damaged Partsĭamaged parts make the AC capacitor less effective by reducing its electric storage capacity and disrupting the flow of current through the AC unit. Note: You can protect the HVAC system by placing it away from the direct sunlight and using reflective blinds on the east and west-facing windows to redirect heat. Electrical overheating occurs when an HVAC system runs for a long period. Heat weakens the capacitor’s capacity to store an electrical charge. Let’s look at some of the causes of HVAC capacitor failure. As a result, it is common for HVAC capacitors to fail before any other component. The HVAC capacitors undergo a significant amount of physical wear and tear. Your AC won’t last that much if it over cycles, suffers from high temperature or if the capacitor has a damaged component. Usually, life expectancy lies between 10 – 20 years. The lifespan of an HVAC capacitor depends on the factors such as heat exposure, usage frequency, etc. The start capacitor provides extra power (voltage) needed to get the motor started and the run capacitor provides energy to keep them running. Here the capacitor provides excess power and supplies a constant current for the duration of the cooling cycle after the air conditioner motor has reached the optimum operating speed. The starting current is between 300 and 500 percent of what the AC typically needs but it gets reduced, once the motors start running. When an alternating current passes through the electrode, an electric field forms between them, and energy gets stored. Now this stored energy is sent in the form of electrical signals to power the motors in the AC system. How does it work?Īn HVAC capacitor contains two electrodes connected to opposing terminals of the AC power supply. Most capacitors have an MFD (microfarads) range of 5 to 80 MFD.
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