nardi extreme 4 90 litre compressor - compressor is slow to build up pressure

by Simon
(UK)

Nardi Air Compressor Extreme 4 90 - Courtesy www.nardicompressori.com

Nardi Air Compressor Extreme 4 90 - Courtesy www.nardicompressori.com

Hi guys I have been given a nardi extreme 4 90 litre compressor. It has one main motor but two v twin pumps on either end of the motor shaft and two fans. Heres a link to the compressor:
www.nardicompressori.com/index.php?page=extreme-4-90-liters-2

its suppose to run around 29 cubic feet a minute or so I have been told but it takes a long time to fill up which leads me to think I have a problem somewhere.

It does reach full pressure and does switch itself off but it seems to take forever. How long should a machine like this take to fill a 90 litre tank ?

I am fairly new to compressors but I do know they usually have an air filter where the air is drawn into the machine, I have looked and looked but I cant see where the air is drawn in ! any help you can give would be much appreciated. if anyone knows where I can get spares fromthat would be much appreciated as well

Regards Simon

______________________
Bill says...

Simon, this is my first encounter with a Nardi.

From the look of the photo (courtesy of: Nardi Compressori website) I would surmise that the air intake filter(s) will be near the top of one of the cylinder heads on each end of the compressor.

Assuming that the air compressor is getting the correct power, the first thing I would check is, after I found the intake(s), is whether or not they are pulling air in when the compressor is running, or is air huffing back out too? If the latter, then your problem may be the intake valve(s).

Please check and post a comment here as to what you found.

Cheers,

Bill





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nardi extreme 4 90 litre compressor - compressor is slow to build up pressure

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Mar 02, 2012
 follow up
by: simon

Hi Bill, I have put a new seal and spring in the non return valve and I have fitted a new thermal cutout switch. The compressor builds to 125 psi and shuts off but air then discharges from the compressor switch, the air stops escaping when the pressure drops to around 85psi. I then took the non return valve off to be certain it is seating correctly by blowing in one side and it is sealing so I refitted it again. I built the air pressure back up to 125psi and let it shut off, as per before the air started leaking from the compressor switch, I then disconnected the plastic tube from the non return valve to the compressor switch and the air no longer drained out of the tank (proving the non return valve is sealing efficiently)the air also stopped draining out of the compressor switch at the same time ??? It is a new switch that I have fitted to the compressor but to be certain I fitted another spare compressor switch I had in the cellar and the same thing happens with the other switch ???
I am going round in circles and getting nowhere fast :-(

any ideas ?
________________
Hi Simon... the air is either coming from the tank check valve (non-return valve) or the switch itself has a leak, allowing air from the tank to bleed up the line to the switch.

Your check of the non-return valve seems conclusive. If the line from the check valve to the pressure switch is not bleeding air when you remove the line end from the switch, then the leak has to be in the switch itself.
Feb 26, 2012
 Hi Bill
by: simon

The compressor rings in all 4 cylinders had worn badly so I have replaced them and the compression is much stronger and fills the tank from empty in no time flat. With new rings in all 4 cylinders there is a small amount of resistance when turning the fans on either end of the compressor (which is to be expected I suppose) the problem I now have is the thermal cut out switch keeps tripping out and stopping the machine when it has run for a short while. There is a small black box on top of the compressor which has a round plastic cylinder inside with two wires running to it, the thermal switch is mounted inside of this black box. Any ideas on what might be the cause ??

Simon
__________________
The motor seems to have a problem handling the load. Might be related to the new rings increasing friction, but that would likely have been the case when the compressor was new. I would next check the capacitors to make sure they are performing properly. See electrical troubleshooting.

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