The air compressor unloader is valve is a small, but important, part of the reciprocating piston compressor. It blows off the pressure inside the discharge pipe when the compressor stops. There is another type of unloader valve , which can be found at the inlet of rotary screw compressors , also called inlet valve or loading valve. Air compressor unloader valve.
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Hey Michael. I could not find an image of your air compressor, but an on line compressor parts supplier showed a schematic kind of identifying the switch. Many pressure switches have the schematic for that switch stenciled under the lid. If the image of the switch I saw is correct, you will have three wires coming to it from the power cord, and there will be 2 or three wires coming from the compressor motor. The pressure switch is just that… a switch.
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A gas furnace pressure switch closes to allow current to pass through and start the ignition of the furnace. If the pressure switch is stuck, it does not send enough power to the inducer, and therefore, the ignition sequence does not begin. Simply put, your gas furnace is made up so that when you power the furnace and adjust your thermostat, the control board gets a call for heat. The control board of the furnace is a complicated system, which is built to sense that the thermostat has been adjusted and to increase or decrease the heat.
They are electro-mechanical devices, and through repeated cycling they do fail, so it helps to know about wiring a compressor pressure switch if you ever have to replace yours. If you are well grounded the power in a VAC circuit can kill you. If you are working on a switch with VAC, the power there will kill you if you are not very careful.