How to Wire a 220V Air Compressor Pressure Switch

Every home and repair shop benefits from an air compressor. However, not every owner knows how to wire a 220V air compressor pressure switch.

Air compressors are used in a variety of ways. This includes inflating toys and tires and powering tools such as drills, sanders, and nail guns.

When you’re wiring a switch for the first time, it may seem like a daunting task. However, with the right guide, the process will be easy.

Start by familiarizing yourself with the different parts of the pressure switch. This way, grasping the step-by-step guide will be easier.

Also, by understanding the switch’s role in the air compressor is to regulate the machine’s pressure, you will be more mindful of the wiring process.

How to Wire a 220V Air Compressor Pressure Switch

What Equipment is Necessary for the Wiring Process?

Before you wire a 220v air compressor pressure switch, you should make sure you have everything you need for the process. This will allow you to work on the pressure switch seamlessly. The necessary items include:

  • Screwdriver
  • Wire strippers
  • Safety gloves
  • Solderless ring terminals
  • Pressure switch

Safety Tips to Consider Before Wiring the Pressure Switch

When working on any electrical equipment, it’s vital to stay safe. This includes trying to install a wire pressure switch on an air compressor. By following the tips outlined below, you will be well equipped to safeguard yourself.

  • You should constantly check the efficiency of your pressure switch to determine beforehand if repairs should be done.
  • Make sure the wires you intend to use have proper insulation.
  • Consider wearing protective clothing, such as gloves and respirator masks, before you start the wiring process.
  • Ensure your hands and the surface around you is dry and free of water.
  • Before connecting terminals and cords, double check the terminal labels and wire colors.
  • Main source of power should be shut off before anything is done.
  • If you’re replacing a pressure switch, make sure its compatible with your air compressor.

How to Wire a 220V Air Compressor Pressure Switch

Step 1: Turn off the circuit breaker

First, ensure that the air compressor and the circuit breaker are near each other for convenience. You should then inspect the circuit breaker to ensure it’s shut off before starting the wiring process. This will prevent unnecessary accidents.

One of the main functions of the pressure switch is to automatically turn the air compressor ON and OFF. This occurs to ensure correct pressure levels in the tank are maintained.

A plugged-in compressor contains power at the switch. This means removing the pressure switch cover will expose live terminals. Working on the air compressor with these live terminals may lead to electrocution.

Therefore, unplugging the main cords of the compressor and double-checking the circuit breaker to ensure its off becomes necessary.

Step 2: Identify the cords and terminals

Once you remove the switch cover, it exposes four terminals(contacts). These terminals are organized as two sets. Most organizations mark these terminals to avoid confusion. One set is marked as LINE, and the other is marked as MOTOR/LOAD.

The two major wires used while wiring the air compressor pressure switch are the power cord (line cord) and the motor cord. The power cord connects to the wall plug and its pressure switch terminal, while the motor cord connects the pressure switch and the motor circuit.

To differentiate the cords, they are normally colored in white, black, and green. The white and black cords are used on the motor terminals. The green cord act as ground wires. They are attached to a metallic section of the switch.

Provided the green wires are correctly attached to the ground point, it doesn’t matter which green wire goes to which of the two spots. A ground wire is essential during electrical installation because it protects the user from shorts in the system.

Step 3: Attach the cords to their terminals

Some cords have soldering attached to the stripped wires. Therefore, all you have to do is attach the cords to the terminals. However, other motor and power cords are not stripped beforehand.

When this is the case, it is up to you to strip the cords. Using a wire stripper, expose the end portions of the wires. Proceed to attach the soldering and these exposed wires.

Check for the terminal markings, and using a screwdriver, loosen the screws. Once you are done, attach the respective cords to their terminals.

Step 4: Restore circuit breaker

Lastly, place the switch cover back on the pressure switch. You can then turn on the compressor by restoring power to the circuit breaker.

Testing your Pressure Switch Performance

Choosing to test your pressure switch to ensure it’s working can make your life easier. This is because you get to determine underlying problems, if any, in advance. A multi-meter/ohmmeter will come in handy during this process.


You should start by unplugging the compressor. Next, pull the housing from the switch. Remove wires running between the terminal block and the pressure switch. However, leave the motor cords intact.

Remove all the air in the compressor tank. When the pressure in the compressor tank is more than the cut-in pressure, the pressure switch won’t automatically trip.

However, as pressure decreases gradually, it will reach the cut-in pressure of the switch. When this happens, you will see and hear the switch trip.

When the pressure in the compressor tank is lower than the normal cut-in, plug the compressor back in. With the use of an ohmmeter, check if the voltage is flowing to the motor.

If the tank has no pressure, the switch should automatically turn ON, and there should be power flow. If this is not the case, the pressure switch is faulty. This means it’s time to buy and wire a second 220 air compressor pressure switch.


Pressure switches play a major electro-mechanical role in the air compressor. This means they are constantly in use. However, this can cause them to wear out and require replacement.

When your air compressor takes in pressure past the cut-out setting of the pressure switch, it is about time you changed it. Fortunately, you now know how to wire a 220V air compressor pressure switch.

How to Choose the Most Efficient Air Compressor for Workshop

Air compressors are energy-generating appliances that can be used pretty much anywhere. When you have a workshop, you care a lot about the condition of all the appliances used in it and their efficiency because these are the tools that help you get work done. Buying your first air compressor, for any purpose, can be incredibly overwhelming. The specific details you should be aware of for each compressor can be complicated and confusing, which will leave you baffled as to which one will best suit the specific needs of your workshop. Here are some tips to help make that decision easier for you.


Choosing Between a Piston and a Portable Air Compressor

When it is time to choose an air compressor for your workshop, you are likely to come across numerous types of compressors which will make your decision even harder. However, for workshops, there are two popular and basic compressor types to choose between; piston and portable air compressors. According to Brett Patterson of Ablesales, a piston compressor is an excellent source of portable air supply for farms and workshops. Just like any other type of air compressor, the piston’s motor works on collecting the air in a set tank and pressing it with the degree of pressure needed. The more you use it, the more pressure the compressor will generate.

On the other hand, a portable air compressor does the exact same job as the piston compressor, just without the need for an air tank. The main perk of a portable air compressor is that it is easy to move around wherever you need it. It might not be as powerful when it comes to pressing the air, but it is quite versatile, especially if you have a large workshop where you might need it in different places at different times. It is also excellent in reducing waste that is harmful to the environment.

Consider the Size of the Compressor

Almost all workshops are known for having large machines and appliances. Essentially, an air compressor would be another machine added to your working space, so you would need to consider the size of the compressor you will be investing in to ensure the best efficiency and ease of work. Whether your workshop is big or small, you need to think about the load of work you are planning to do with the air compressor as that will determine the size of the tank required.

Compressors that need an air tank are usually more efficient for more demanding workshops, however, they are quite large. On the other hand, compressors with small or no air tanks can be more suitable for workshops with small workloads and smaller working spaces.


Check the Features

Efficiency and durability are essential features that workshop owners or managers look for in their appliances. The durability of an air compressor determines how much work it will be able to offer you as well as the life span of its productivity.

When you choose an air compressor, features like the coating of the tank and the strength of the steel build of the compressor itself should be at the top of your list. Read reviews on the supplier and manufacturer before you purchase to get a better idea of how reliable that specific machine will be for your workshop’s needs.

How is the Compressor Powered?

Workshop owners invest in air compressors to generate energy used in manufacturing products or powering certain appliances. However, the compressors themselves need to be powered in some way. Compressors can be powered by electricity, petrol, or diesel. Electric compressors are the most popular because of how energy-efficient and economical they are. However, they are not as powerful as their petrol-powered counterparts, which can be more reliable when it comes to pressing air.

Diesel compressors are similar to petrol-powered ones, but they can be a bit more harmful to the planet as they emit larger amounts of nitrogen compounds and particulate matter, which pollute the air and contribute to climate change.

Investing in an air compressor can be beneficial for your workshop, regardless of how big or small it is. But when it comes to deciding which compressor is best suited for your needs, the choice can be challenging. Your best bet is to do some research in advance and compare different types, sizes, and prices so you can choose which best fits your needs and budget. It also pays to read up on the different power sources and try your best to opt for a unit that doesn’t contribute as much to environmental degradation.