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Old 08-24-2008, 01:21 PM   #16
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220 volt switch for compressor


Well, upon further inspection and tinkering, it looks like the pressure switch is no good either. Where can I get a 220 volt pressure switch that has an intergral on/off switch?

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Old 08-24-2008, 02:48 PM   #17
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220 volt switch for compressor


There are many pressure switches available. To specify the right one I'll need a bit more info.

1) Operating pressure. If the pump is single stage, 150PSI is max. If it's 2 stage, 175PSI is max. (On a 2 stage model, a big cylinder feeds a smaller one, on single stage ones all cylinders feed directly to the tank). Also, some switches come with fixed differential (the difference between turn-on and turn-off) pressure, and some are adjustable. The fixed differential ones are much less expensive. Most 2 stage compressors turn on at 145PSI, and off at 175PSI. Single stage ones are usually 80-100, 95-125, or 120-150.

2) HP of the motor. If this is not available, amps will do.

3) Mounting. Usually they simply screw on to a 1/4" pipe, but they can be 3/8" or 1/2".

4) Unloader or no? An unloader is a small tube that connects to a valve mounted on the pressure switch. Usually 1/4", the good ones are copper, the cheap ones are plastic. The purpose of this valve is to relieve the pressure in the piping between the pump and the tank so as to make starting easier. (Or sometimes even possible).

Rob
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Old 08-24-2008, 04:07 PM   #18
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220 volt switch for compressor


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There are many pressure switches available. To specify the right one I'll need a bit more info.

1) Operating pressure. If the pump is single stage, 150PSI is max. If it's 2 stage, 175PSI is max. (On a 2 stage model, a big cylinder feeds a smaller one, on single stage ones all cylinders feed directly to the tank). Also, some switches come with fixed differential (the difference between turn-on and turn-off) pressure, and some are adjustable. The fixed differential ones are much less expensive. Most 2 stage compressors turn on at 145PSI, and off at 175PSI. Single stage ones are usually 80-100, 95-125, or 120-150.

2) HP of the motor. If this is not available, amps will do.

3) Mounting. Usually they simply screw on to a 1/4" pipe, but they can be 3/8" or 1/2".

4) Unloader or no? An unloader is a small tube that connects to a valve mounted on the pressure switch. Usually 1/4", the good ones are copper, the cheap ones are plastic. The purpose of this valve is to relieve the pressure in the piping between the pump and the tank so as to make starting easier. (Or sometimes even possible).

Rob
It's a single stage 1/2 hp 60 gallon 220 compressor. Don't know the amps off hand. It is an older unit. The thing tops out at about 135psi. It takes a long time to fill the empty tank, so it may need rings.

For now, I'm just going to replace the pressure switch. I figured I could kill 2 birds w/ one stone by getting one with a manual on/off switch as well. The 95/125 switch would be fine.

Where can I get one of these?
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Old 08-24-2008, 06:21 PM   #19
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220 volt switch for compressor


Grainger (www.grainger.com) has them, the 95-125 fixed differential with on-off switch is part#1V624, for less than $25. If you need the unloader, then use #3AY90. It goes for about $28. It has an on-off switch as well. Both of these come set at 95-125PSI, but they can be set to turn off anywhere from 70 to 150. There will always be 30PSI between the turn-on and turn-off.

If you can't get it from Grainger, they're made by SquareD. The SquareD part # of the one without the unloader is 9013FHG12J52M1. The one with the unloader is 9013FHG12J52M1X. Anyone that sells SquareD should be able to order it for you.

Rob

P.S. A 1/2HP compressor would likely take around an hour to fill up a 60 gallon tank to 125PSI. If the oil level in the crankcase stays the same over time, then the rings are OK.
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Old 08-24-2008, 06:31 PM   #20
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220 volt switch for compressor


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Grainger (www.grainger.com) has them, the 95-125 fixed differential with on-off switch is part#1V624, for less than $25. If you need the unloader, then use #3AY90. It goes for about $28. It has an on-off switch as well. Both of these come set at 95-125PSI, but they can be set to turn off anywhere from 70 to 150. There will always be 30PSI between the turn-on and turn-off.

If you can't get it from Grainger, they're made by SquareD. The SquareD part # of the one without the unloader is 9013FHG12J52M1. The one with the unloader is 9013FHG12J52M1X. Anyone that sells SquareD should be able to order it for you.

Rob

P.S. A 1/2HP compressor would likely take around an hour to fill up a 60 gallon tank to 125PSI. If the oil level in the crankcase stays the same over time, then the rings are OK.
Thanks for the help. I meant to say the compressor is 1 1/2hp. my mistake...

Thanks again for the part #'s. I have a grainger near me.
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Old 08-24-2008, 06:45 PM   #21
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220 volt switch for compressor


Either one of those switches will handle 2HP at 220. A 1-1/2HP compressor should fill a 60 gallon tank in about 20-30 minutes, but that's just a guess.

Rob
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Old 08-24-2008, 06:51 PM   #22
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220 volt switch for compressor


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Either one of those switches will handle 2HP at 220. A 1-1/2HP compressor should fill a 60 gallon tank in about 20-30 minutes, but that's just a guess.

Rob
Yeah, that seems about right. It takes about 25 minutes. Thanks again for all the help.
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Old 08-24-2008, 06:58 PM   #23
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220 volt switch for compressor


One more stupid question micromind..

How do I know if I need a switch with an unloader?
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Old 08-24-2008, 08:14 PM   #24
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220 volt switch for compressor


The unloader is connected to a small (1/4") tube that bleeds air off the piping and compressor head during shut-off. If the existing pressure switch has a tube connected to it, you'll need one with an unloader. If it doesn't then you don't. This isn't electrical, it's a copper or plastic tube.

Rob
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Old 08-24-2008, 09:22 PM   #25
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220 volt switch for compressor


Oh- got it. I won't need one then. Thanks again. I'll be going over to grainger this week.

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