Question about Air Tools & Compressors
This is the most popular switch used on compressors but may not be exactly what you pressure switch looks like. You will need to determine how the contacts transfer power across the terminals. Lets number the terminals from left to right 1,2,3,4. On this switch notice how power crosses from 1 to 2 and from 3 to 4. You can determin how power is transfered on your switch by using meter. On this switch, leads from motor (load) would be connected to 1 and 4 and line in ()would be connected to 2 and 3. Determine with meter which leads from your pigtail are 115v each. Pigtails have either 3 or four wires depending on your wall plug configuration. You will only need the two 115v lines (connected to 2 and 3) and a ground wire connected to green screw. Under the cap of the pressure switch, there should be a wiring diagram to assist you for your particular switch. Good luck
Posted on Mar 19, 2011
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Posted on Jan 02, 2017
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