How to Adjust an Air Pressure Switch
Air compressors utilize adjustable pressure switches to regulate the specific cut-in and cut-out levels. The "cut-in" level is the lowest air pressure setting on the switch that energizes the electric motor circuit. The motor provides the power to drive the air compressor. The motor continues to operate until the optimum accumulated "cut-out" air pressure level setting is reached. At this point, the motor circuit is switched off until the accumulated air in the receiver tank falls to the cut-in level, and the cycle repeats itself. Does this Spark an idea?
Instructions
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1
Remove the cover screw and cover from the air compressor pressure switch with the appropriate screwdriver. Turn the screw counterclockwise and lift the cover off.
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2
Turn the air compressor on and allow it to operate until it shuts itself off. Record the reading of the air pressure gauge on the receiver tank as it shuts off. Have a pencil and paper handy to make the notations.
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3
Release air from the tank by connecting a blowgun tool to the air hose. The compressor will start up again when it reaches its cut-in pressure. Record the reading on the pressure gauge when it restarts.
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4
Turn the main calibration screw located on the top of the pressure switch clockwise with a screwdriver to increase the cut-in pressure or counterclockwise to decrease it.
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5
Repeat Steps 3 and 4 until the desired cut-in and cut-out pressure settings are reached.
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6
Replace the cover and tighten the cover screw clockwise with the screwdriver.
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Tips & Warnings
Some air pressure switches also have a "differential" pressure adjustment screw that allows you to change the cut-out pressure without altering the cut-in pressure. Adjust this screw clockwise to increase or counterclockwise to decrease the cut-out pressure.
The air bleed, located on the receiver tank, can be used to release air pressure if an air hose and blowgun are not available. Air compressors with dedicated pipe lines may not use these types of connections.
Never wear loose fitting clothing when working with air compressors.
