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Air compressor start run capacitor
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<blockquote data-quote="Marvo" data-source="post: 450182" data-attributes="member: 20838"><p>The pressure switch that stops and starts the motor has a small unloader valve built into it that dumps the air pressure between the compressor and the check valve on the tank. By doing this it makes less load on start-up because it's not starting under full head pressure. Usually the unloader is an integral part of the pressure switch with small hobby compressors, larger units have a separate unloader valve. If the unloader is working you hear a loud hiss every time the compressor reaches its set pressure and stops running. Sometimes the unloader will leak because of debris or wear in the needle valve and sometimes it can jam closed. If it's an intermittant problem the chances of catching it jamming are slim so just replace the pressure switch anyway, they're not very expensive.</p></blockquote><p></p>
[QUOTE="Marvo, post: 450182, member: 20838"] The pressure switch that stops and starts the motor has a small unloader valve built into it that dumps the air pressure between the compressor and the check valve on the tank. By doing this it makes less load on start-up because it's not starting under full head pressure. Usually the unloader is an integral part of the pressure switch with small hobby compressors, larger units have a separate unloader valve. If the unloader is working you hear a loud hiss every time the compressor reaches its set pressure and stops running. Sometimes the unloader will leak because of debris or wear in the needle valve and sometimes it can jam closed. If it's an intermittant problem the chances of catching it jamming are slim so just replace the pressure switch anyway, they're not very expensive. [/QUOTE]
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