Quote:
Originally Posted by wilsonmw04
We tried that and out of 4 that we have we never got one to 120. only 115.
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The little screw on the side is a locking screw. You adjust the switch by turning the barrel. Once you run out of range, the switch stops working. (which means adjusting to the high side the compressor will stay on.) The part number of the legal switch calls for a set pressure of 115 PSIg rising. So most switches will turn off close to 115 psi. They turn back on based on the hysteresis of the switch which isn't as precise. As Al said, they are nonadjustable by rule.
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