Dual Run Capacitors
Dual run capacitors are commonly used in HVAC (heating, ventilation, and air conditioning) units. Dual capacitors have three terminals, unlike regular run capacitors, which have only two. Electrically, they are the same as run capacitors that have two terminals. Using a dual run capacitor allows you to save space if you have a small mounting area. The terminals are also clearly marked, making it easy to hook it up to the different components of your air conditioner.
Dual capacitors usually have connections marked "C" for "common," "H" or "HERM" for the hermetic compressor, and "F" or "FAN" for the fan in an HVAC unit. They also have two different capacitance ratings (for example, 35/5 uf). The larger value is always connected to the compressor (35 uf in the example), while the smaller value will always be connected to the fan (in this case, 5 uf).
The following specifications should be taken into consideration when selecting a new capacitor.
Make sure the capacitance of your new capacitor is the same as that of the one you're replacing.
Dual capacitors are usually rated for 370V or 440V. Use a capacitor that has the same or higher voltage as your system voltage. Never select one that has a lower voltage rating than your system voltage.
Most capacitors will be rated for both 50 and 60 Hz.
Oval vs. Round Case Style
As long as the capacitance, voltage, and frequency of your capacitor is right for your application, the shape of the capacitor does not matter as long as it can fit within the provided mounting space in your motor or air conditioning unit.
Most capacitor terminals include one to four ¼" push on tabs. Most have 3 to 4 tabs, so make sure you have enough tabs per connection post to make the connections you need.
Video - Replacing a Dual Run Capacitor
Watch the video tutorial on how to diagnose problems with your air conditioning unit and how to replace the run capacitors in it.
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