Iron Horse compressor - IHVP1520L Cutout Problems

by Mike
(St. Thomas, ON.,Canada)

I have an Iron Horse compressor - IHVP1520L. I've had the bottom end rebuilt do to a seizure (lack of oil). Since I've gotten it back, the Cut in works, but not the Cut out. If I turn the manual switch off after cut out pressure, compressor stops, and re engages when pressure drops to cut in pressure. I've change the check valve, and the pressure switch to no avail. No leaks either.

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Mike, if the air compressor runs the tank pressure up past the pressure switch cut out setting then, eventually, the PRV will blow off. Is this what is happening with your compressor?

It typically is a failed pressure switch that causes this to happen... or, the cut out pressure setting on the switch is higher than the PRV pressure release.

What is the cut out setting on your new pressure switch?

When the pressure reaches that point the diaphragm in the switch should trip the points open and the compressor should stop.

If power is still flowing through the switch to the motor circuit and the tank pressure is higher than the cut out pressure setting of the switch, then the switch has failed.

Bill

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Jul 01, 2013
Follow up
by: Mike

After reading several other posts, I have solved the issue. The problem was not the pressure switch, nor the check valve; when I had picked up my compressor from aforementioned rebuild, the fellow at the compressor shop suggested I use a larger cannister filter than that originally came with the unit; I then removed the larger unit, ran it, and it cut out like it was supposed to, I then reinstalled original, smaller filter cannister, and the cutout worked like it was supposed to. My question to this is WHY?
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Mike, that's a very good question.

If the new intake filter impeded flow (damaged - dirty) then it would take your air compressor a lot longer to fill, or the motor would go off on thermal overload.

A plugged filter has no bearing on the pressure setting at which the compressor turns off, it only affects the compressor running.

I have no idea why a different (or no) intake filter would cause your air compressor to fill past cut out and not shut off.

Doesn't make any sense to me. Anyone else?

B.

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compressor runs all the time and pumps only 40 lbs no air leak is heard

by Joe Dunn
(Alma ar)

runs and never shuts off and only pumps 40 lbs.

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Bill says...

Joe, could be a number of reasons why your air compressor runs but won't build pressure past a certain pressure level.

Maybe go to the TROUBLESHOOTING page and click the link to "will not build pressure". Have a look at the information, see if that helps, and if not, post here as a comment to tell me what you did or didn't find.

Cheers,

Bill

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