The pressure where the compressor starts-up. Depending on how far the actual pressure is below your desired cut-in pressure, turn the screw a little further (quarter-turn or less). Example of set-screws for cut-in and differential pressure. 10 One-Post Pressure Switches These allow adjustment of the cut-on and cut-off pressure at the same time. If the contacts are still open at normal operating differential pressure, adjust the set point screw until the contacts make. In other words.. to set the lowest pressure. The factory preset is normally 80 psi for the pump and 40 psi for the pressure switch. Open a drain valve to slowly let the compressed air escape and wait until the compressor starts. Some pressure switches can only be adjusted when under pressure. See image below. Adjusting Pressure Switch. This will burn the compressor motor, will cause extra wear on the compressor components and will damage the pressure switch. Both for small (piston) compressors and for large industrial rotary screw compressors, the pressure setting is the most basic and most important setting of the compressor. With static pressure stable, close the equalizer valve to isolate the HI side from the LO side. This is the cut-in pressure. Note the pressure reading and write it down. Most pressure switches are factory-set at a cut-in pressure of 6 bar with a pressure differential of 1 bar (which makes the cut-out pressure 7 bar). Most jet pump well systems have a shut-off switch near the jet pump. And when you’re looking to buy a pressure switch, check out my buying a pressure switch page. You set the minimum pressure on the pressure switch at 6 bar (or 6.1 to be sure) and you set the maximum pressure at 7.1 bar. ), ( This ensures your … The first step to do, when it comes to air compressor pressure switch, is to set the cut-in pressure. ), ( The adjustment is done with a very small Allen wrench — 050" to be exact. ), ( To fix this, you do not need to call a repairman. The switch could ‘activate’ either on a pressure rise or a pressure fall. ), ( Click on the hyperlinks below to see pressure switch videos on the RC Worst YouTube channel: 1. When you increase the pressure band, the compressor will run longer and has more time to heat up to remove any water or moisture inside the compressor (the number one enemy of compressors!). Check the status of the electrical contacts against the following differential pressure scenarios and follow the instructions that match the status of the contacts: Contacts break precisely at decreasing differential pressure set point, repeat steps, If contacts are open when decreasing differential pressure is reached, adjust set point screw until contacts make. Repeat Steps. Adjust the cut-in pressure with the big set screw. What you should know about your desiccant compressed air dryer. Adjusting the pressure switch changes the high and low water pressure limits. Close the equalizer valve to stabilize differential pressure. On most (but not all…) pressure switches, the big set-screw is to set the cut-in pressure. Position 4 provides a manual reset on the low-pressure side and an automatic reset on the high pressure side. 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