compressor problem

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Rob in NH
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compressor problem

Postby Rob in NH » Wed Jul 29, 2015 11:59 am

I have a IR T30 compressor that blows the breaker when it restarts, it starts fine below 50. its a 2cylinder with an 80 gallon tank.
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Re: compressor problem

Postby Eugene » Wed Jul 29, 2015 2:13 pm

Rob in NH wrote: it starts fine below 50.
Below 50 PSI? Check the motor's capacitor(s).
I have an excuse. CRS.

Rob in NH
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Re: compressor problem

Postby Rob in NH » Wed Jul 29, 2015 2:35 pm

i replaced them
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birddog
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Re: compressor problem

Postby birddog » Wed Jul 29, 2015 9:02 pm

A couple possibilities are. The motor windings are starting to brake down, so it's drawing more power. Maybe the pressure switch isn't making good contact and there is less then normal voltage going to the motor.
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John *.?-!.* cub owner
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Re: compressor problem

Postby John *.?-!.* cub owner » Wed Jul 29, 2015 9:44 pm

Not familiar with a T30, but most compressors have and unloaded built into he pressure switch that lets pressure off the line between the compressor and pressure tank. That is the hiss you hear each time the compressor reaches pressure and shuts off. There is a check valve where the line goes into the tank to prevent air coming back to the compressor. All of this works together to allow the compressor to start without having any pressure against the pistons for the first 2 or 3 rounds.
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Size of your breaker?

Postby Charles (49) Mo » Sat Sep 05, 2015 4:00 am

These were the specs I found.



Electric Air Compressor, 2 Stage, 5 HP
by INGERSOLL-RAND




Technical Specifications



Zoro #: G2426672 | Mfr #: 2340L5
On Pressure Switch Setting: 135 Off Pressure Switch Setting: 175
Cylinder Material: Cast Iron Lubrication Type: Splash Lubricated
Hz: 60 Standards: ASME, California Code, CSA
Tank Type: Vertical Enclosure: NEMA 1
Control: Pressure Switch Motor Type: Open Dripproof
Compressor Package Type: Base Model Compressor Type: Tank Mounted
Finish: Powder Coated Max. Pressure: 175 psi
ASME Tank: Yes Item: Electric Air Compressor
Number of Stages: 2 Includes: Motor Starter Not Included, Manual Drain Valve, Pressure Gauge, Pressure Safety Valve
Tank Size: 60 gal. Phase: 1
Pump Oil Capacity: 32 oz. (F)NPT Outlet: 1/2"
HP: 5 Amps: 28
Free Air CFM @ Max. Pressure: 14 dBA @ 3 Feet: 85.0
Voltage: 230 Pump RPM: 1575
Overall Width: 30" Overall Length: 32"
Overall Height: 69" Zoro Number: G2426672
Mfr Number: 2340L5




Product Description


Electric Two Stage Air Compressor, Type 30, HP Rating 5.0 HP, Air Delivery 15 CFM, Maximum Pressure 175 PSI, Voltage Rating 230 Single Phase, Current Rating 28 Amps, Tank Capacity 60 Gallons, Rated ASME, Tank Type Vertical, Oil Capacity 32 Ounces, With Manual Drain, Discharge Isolation Valve, Height 69 Inches, Length 32 Inches, Width 30 Inches, Outlet 1/2 Inch FNPT, Start Up Kit Number G2300146



Your unloader valve might be sticking. They usually open at 3 to 5 #'s above back pressure.

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Re: compressor problem

Postby ricky racer » Sat Sep 05, 2015 5:37 am

What John says makes the most sense to me. I'd look at that check valve.
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Rob in NH
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Re: compressor problem

Postby Rob in NH » Sat Sep 05, 2015 8:29 am

I still haven't done anything yet, not sure what to replace yet, replace the bad parts or buy a new compressor. Thanks for the information.
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bob in CT
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Re: compressor problem

Postby bob in CT » Sat Sep 05, 2015 12:31 pm

Draining the tank completely would be an easy way to check for a problem with back pressure.

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Re: compressor problem

Postby John *.?-!.* cub owner » Sat Sep 05, 2015 7:51 pm

If you do not hear a hiss when it reaches pressure and shuts off, most likely it is the unloader which is built into the pressure switch. The assembly normally sells for around $40 to $50, a lot cheaper than a comparable complete compressor. Possible that some kind of insect has built a mud nest in the port of the unloader and it cannot vent. I had that happen on a blow gun once.It was a very small hole about the size of the lead in a #2 pencil, but something had sure plugged it.
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Charles (49) Mo
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Re: compressor problem

Postby Charles (49) Mo » Sun Sep 06, 2015 12:45 am

Valve can be cleaned. Varnish and caked oil crud makes seats stick. Take it apart and carefully clean with approved solvent. Your compressor is one fine unit. 8)


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