Carl, I have a 5 hp 220 air compressor and the contacts after many years the contacts fried. I looked long and hard for a pressure sw and at the time grangers had the largest, 3 hp. So instead of breaking both sides of the 220v, I jumped both sides of the switch together and wired only leg to the pressure switch. The other leg I wired directly to the motor. Many times, I've seen air conditioners where the motor contractor just breaks one leg and the other let is hot all the time. I'm sure there may be some NEC code that says you have to make and break both sides of 220v going to a well. Why do they wire pressure switches, 110v, where neutral and power are going to the switch? What does that accomplish? I figure by jumping both sets of contacts together, I came up with a bigger switch.
Option 2: Use pressure switch to pick up a motor contactor. Wire pump to motor contactor. I was going to do this if my fast fix didn't work. Well that was many years ago. Still using the 3 hp pressure sw on a 5 hp motor. Motor contactors used on 3 hp A/C are between $10-15. If you use a 24v contactor coil, you will also need a 24v transformer.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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