Speedaire model 4B221 with a 4B225 pump.

Unit will not shut off by itself. What part need to be replaced? Thank You


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In the absence of a lot more info, all I can surmise is that you have a problem, as the pressure switch is the device that turns the compressor on a low cut in pressure, and off at the high cut out pressure point.

If the compressor is not turning on or off when it should, replace the pressure switch. Or, provide a bit more information about your air compressor problem as a comment and we'll try to help you figure out what the problem is.

Cheers,

Bill

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Tank won't repressurize.

by Robert B. Hale
(Cumberland BC Canada)

When I start the compressor completely empty of air it pumps right up. After depleting some of the air and when the compressor needs to repressuize the tank it doesn't seem able to overcome the small amount of pressure already in the tank and the circuit breaker trips.
I was thinking it is one or both of the capacitors but someone else suggested that it could be a clogged relief valve. I am not an electronics type.
It is a model 2Z499B. According to the Speedair website the 'B' should not be there. It is a 2 cylinder with a horizontal 20 gallon, or thereabouts, tank. No idea of its age.
Anyone? Thanks.
Robert

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Bill says...

Hi Robert...

Go to the site map page, click VALVES, and then click UNLOADER VALVES.

I think that your unloader valve isn't working properly, and this is overloading your motor on start up.

Cheers,

Bill

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How do you hook up a Speedaire 4GNN1 auto drain-w/float?

by Greg
(Austin, Tx)


I don't have any instructions, and want to hook up a Speedaire 4GNN1 auto drain w-float, to my 60 gallon air compressor, at the bottom drain.
Its not obvious which is input or output, or top or bottom, or what the screw does. For this to work, does it need to strictly mount below the absolut bottom of the tank, or can it mount slightly above? I am ready to bolt the tank to a slab, and need to know if I have to raise the tank an extra 5", or can it mount in a different orientation. Thanks.
http://www.grainger.com/Grainger/SPEEDAIRE-External-Auto-Drain-4GNN1?Pid=search

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Greg, I did respond to your other post. I did look at the Grainger site you referred to, and it sure is ambiguous.

I believe it will have to be in a vertical orientation, yet you can plumb out from under your tank drain if you don't want to raise the tank the full height to allow the install.

According to the Grainger site, it has a manual override. Plumb air to one of the port, and turn the override and see what happens. If it burps then it's likely the right port. If not, re-plumb it to the other port.

Bill



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