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Have a campbell housfeld compressor supposed to shut off at 120 but it blow the breaker after 100 is there a way to lower it so it cuts off earlier then 120? i let my friend borrow it and broke the switch, i can still turn in eiyh a screw driver from off to auto, but wont kick off till the breaker blows...said he had the wires off and im thinking he put them in the worong spots, any ideas or anyone that have this and can let me know where they go, 4 wires...

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If wires were in the wrong slots you would know once you put power on the unit, the gauge could be damaged and giving you a false reading and the pressure switch may also be damaged.also if you are using an extension chord this may also cause high amp draw.

Posted on Jul 21, 2009

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In our shop we have found the conditions you describe are almost always attributable to the power supply. First, never run a compressor on an extension cord, you are always better off running longer air lines. If you absolutely have to run an extension cord use a least a 12 guage cord no longer than 25 feet. If possible plug the compressor in as close to the circuit box as possible. Lastly the circuit the compressor is plugged into should be rated at least 15 amps, 20 amps is recommended for most compressors. Low amp lines cause the motor to overheat trying to get enough power and usually blow the circuit breaker at the motor and not at the circuit breaker. Lastly, use only compressor oil in the pump and make sure it's not overfull. This will also cause the motor to work harder and trip the circuit breaker.

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Generally, the pressure switch is not adjusted more than once or twice in the life of the compressor since the discharge pressure can be adjusted with pressure regulator. However the life of the compressor can be increased if lower pressure settings are maintained. Your pressure switch was set at the factory to a setting of about 120 - 150. If your cutout pressure is higher than 150 surely lower.
STEP 1: Turn Main Calibration Screw ( center screw with large spring) clockwise to increase pressure and turn counter-clockwise to decrease pressure.

STEP 2: Turn Differential Pressure Screw (small spring) clockwise to decrease cut-in pressure and
turn counter-clockwise to increase cut-in pressure.

Differential Pressure is defined as the difference between cut-out and cut-in pressure. There should be about 7 to 12 psi difference between cut-out and cut-in.
In our shop we rarely adjust more than a couple of turns because these switches are sensitive.
Good Luck and please post again if you have other concerns about your compressor.

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