How to Install and Adjust an Air Pressure Switch for Air Compressor?
Learn how to properly turn on/off the air pressure switch for air compressor, troubleshoot common issues, understand warranty tips, and adjust a new pressure switch for smooth compressor startup.
Sofiya
7/15/20253 min read
What is an air pressure switch for air compressor?
An air pressure switch is a crucial component used to control the start and stop of an air compressor. When the pressure in the air tank drops below the preset cut-in level, the switch automatically starts the compressor. Once the pressure reaches the upper cut-out limit, the switch stops the compressor. This enables intelligent control and prevents over-pressurization.
Key Features:
Automatic Start/Stop Control: Automatically operates the compressor based on the set cut-in and cut-out pressure values.
Equipment Protection: Prevents compressor overload or overpressure, helping extend service life.
Energy Efficiency: Reduces unnecessary start/stop cycles and minimizes energy waste.
How to Wire an Air Compressor Pressure Switch? (Step-by-Step Guide / Wiring Tips & Common Mistakes ）
For more wiring tips, check out this Quincy Compressor.
To wire your air compressor pressure switch:
1.Turn off the power supply to avoid electrical shock.
2.Remove the cover of the pressure switch to expose the terminals.
3.Connect the incoming power wires (from the breaker or plug) to the line terminals.
4.Connect the motor wires to the load terminals.
5.Secure all connections tightly and reattach the cover.
6.Turn the power back on and test pressure cut-in and cut-out points.
Important Wiring Tips:
For more wiring safety tips, check out this Grainger guide on pressure switch wiring.”
1. Always disconnect power before starting any wiring work.
2.Use wires with appropriate gauge and insulation for your voltage and current.
3.Make sure the line (power in) and load (motor out) terminals are clearly identified.
4.Ensure tight and secure connections to prevent sparks or overheating.
5.Use a ground wire if your switch has a grounding terminal.
Common Mistakes to Avoid
1.Reversing line and load wires
Mixing them up will cause the compressor to malfunction or not start.
2.Skipping the ground connection
Increases risk of electrical shock or equipment damage.
3. Not matching voltage rating
Using a 220V switch on a 110V system (or vice versa) is dangerous.
4.Using undersized wire
Can cause overheating and pose fire hazards.
How to adjust air pressure switch on air compressor?
1. Turn off and unplug the compressor for safety.
2.Remove the cover of the air pressure switch to access the adjustment screws.
3.Locate the two main screws:
4.One controls cut-in pressure (when the compressor starts)
5.The other controls cut-out pressure (when the compressor stops)
6.Use a screwdriver to turn clockwise to increase, or counter-clockwise to decrease the desired pressure.
7.Reassemble the cover, restore power, and test the new settings.
This method applies to most standard air pressure switches for air compressors, especially in DIY, garage, or industrial applications. It's important to avoid setting the pressure too high, which can stress the system or trigger the safety valve.
Need a replacement or upgrade? Our reliable pressure switches in air compressor systems are easy to adjust, built for durability, and available in multiple pressure ranges.
