On many pressure switches, there is no 'on/auto/off' switch. This type is found mainly on smaller (reciprocating) air compressor, where to motor is directly started and stopped by the pressure switch electrical contacts (see also 'electrical contacts' further down this page). This is basically an all-in-one solution for small compressors. When you press 'off' it will ignore the setpoints and shut down the compressor.Īir compressor pressure switch with OFF / AUTO selection When you press 'on' or ' auto' it will automatically start and stop the compressor according to the set pressure setpoints. Most of the time this basically is the same thing (the wording depends on the manufacturer). Some pressure switches have an on/off or and auto/off switch. Most pressure switches, especially on air compressors will have more than of of the following. Note that this is not an or-or list, but rather an and-and list. So, what types of pressure switches are there?Here's a basic overview of the different models and options available. Some are very basic and not adjustable, while other are very flexible or have extra options.
While all pressure switches have the same purpose (switch on or off at a certain pressure), pressure switches come in a lot of different design and types. Some air compressors are equipped with a pressure switch that has a ON / OFF switch as part of it, one of which, manfuactured by Lefoo, you can see below.Air pressure switch models and options, a perfect pressure switch for every application.
My Pressure Switch has my compressor ON OFF switch Having an air compressor fire up in the basement in the middle of the night, scaring the spouse awake, is NOT a good thing! If you want to be sure your air compressor stays off, remove the power source by unplugging the air compressor or, if the ON/OFF switch works, shut the switch off. However, if you leave an air compressor powered up, and you have a leak in the plumbing or a tank check valve that leaks a bit, then your air compressor will cycle ON and OFF as the pressure in the tank fluctuates. Now, the compressor would turn on and off based on the pressure in the tank, and as long as the air compressor was plugged in, it would cycle on its own, based on the cut in and cut out pressure settings of the pressure switch. If we simply cut the terminals off these two wires and connected them together, we would have completely bypassed the ON OFF switch. One of these wires comes from the pressure switch and the other goes to the motor circuit. The two wires inside the white circle in the photo above are connected to the compressor ON OFF switch. Either they are passing electricity (the switch is ON or closed) or they are non-passing (the switch is OFF or open). Most of the air compressor ON OFF switches are single pole, rocker style – two-position switches. The compressor ON OFF switch shown on these pages is a common one. Then, with the new switch it’s but a few minutes work to pop it into the shroud opening, hold the shroud over the compressor to allow us to push the two wires onto the spade terminals (it doesn’t matter which wire goes on which side except that your ON may become OFF or the opposite if you reverse the wires), to reattach the housing, and then the air compressor, with its fixed broken compressor ON OFF switch, is back in business. Odds are very good you will find an exact replacement. So, now with switch in hand we either find and purchase a replacement on line, or head off to a local electronics type shop where a replacement switch can be acquired for just a few dollars. Spending time to try and disassemble and fix a compressor switch would not be cost or time effective. They will cost you a couple of dollars to buy. These switches, we expect, cost the manufacturer a few cents to make. That’s it.Īs a result, you really will not be fixing a compressor switch so much as acquiring a working replacement. A simple toggle to move the points inside the switch from non-passing to passing (open or close) and two spade terminals on the back of the switch for the quick-connection of the wires inside the compressor housing. The photo above shows how simple this type of switch is.
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