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Your 120 volt power supply hasn’t got enough oomph to start the motor without help from a start capacitor anyway, and that additional load on the compressor motor is typically sufficient to prevent the air compressor from starting. If air is trapped over the piston on the air compressor, that adds load to the start circuit. On other pages on this site we talk about how marginal a 120 volt air compressor motor really is, and the steps the motor manufacturers must take to ensure that, even with all compressor components working at their best, even being able to start. The compressor pump stops, regardless of where the piston in the cylinder is located, and that often means that there is compressed air trapped over the piston when the pump stops on cut out. When the reciprocating air compressor reaches the cut out pressure setting the power supply to the compressor motor stops, and as a result, the compressor pump stops. The pressure switch on the right incorporates an ON/OFF lever on the right side as well. In the photo below the unloader valve connections are the brass fittings on the left sides of these Lefoo brand pressure switches. Reciprocating air compressors always have an unloader valve. A reciprocating air compressor will have at least one cylinder, and often may have two or sometimes even three cylinders. This Fix My Compressor website is focused on the do it yourself and small workshop air compressor and most of these are reciprocating type air compressors. What the air compressor unloader valve doesĬompressor unloader valves are common pieces of equipment on many types of air compressors including reciprocating, rotary screw and even gasoline or other fossil fueled air compressors. If the unloader valve has failed when the motor tries to start quite often the motor will lug (struggle) to start and typically a breaker will trip or a fuse will blow. When the the air compressor unloader valve is working correctly, the pressure in the tank has dropped to below the normal cut in pressure level of the pressure switch, the pressure switch trips to allow power to flow through it, and the motor starts. The air compressor unloader valve provides a critical function in preparing your air compressor to restart.Ī failed air compressor unloader valve is one of the most common reasons why your air compressor cannot restart after you have used air from the compressor tank. Craftsman assy compressor motor air.Hey! This site is reader-supported and we earn commissions if you purchase products from retailers after clicking on a link from our site. What Is This Part Of My Craftsman Compressor Called? It Was Leaking repairable leaking intermittently Of Craftsman Air Compressor 15206 User Guide | Ĭraftsman compressor warranty user air Craftsman 919165521 Air Compressor Parts | Sears PartsDirect craftsman assy compressor motor air How Does An Air Compressor Work? Air Compressor 101 | About Air Craftsman 921.165720 air compressor manual- need an owners manual.
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