Correctly Sizing a Capacitor
I don't know how many times a technician has said that they installed a part based on what was on their service truck. I have heard of technicians wasting money over-sizing contactors, cutting down air filters, and even using controlled substances to clear condensate drains! Of course, these scenarios all get the job done, but I would argue the many reasons why not to do these. The one thing that gets to me is when a technician doesn't verify they are installing the correct size dual run capacitor. Believe it or not, there is a simple method to figuring the correct size capacitor, without waiting on hold for the distributor's guru. Of course, you could use a multimeter that reads microfarads (uf), but this will only tell you if the existing capacitor is weak - not the correct size!
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Posted by Excess Air