Question about Ingersoll Rand Type 30 Electric Driven Two Stage Horizontal Air Compressor 120 Gallon Fully Packaged Ir 2545E10VFP

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No pressure could the unloaders being stuck open cause a los in pressure and what causes the unloaders to stick open. Next if the unloaders are stuck closed could that trip ther motor to overlad.

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Unloaders fail due to carbon deposits on seat. Unloaders can be found in the head or in the tank. Failed unloaders /check valves cause the motor to strain but rarely prevent pressure from building. Events that prevent pressure from building are as follows: restricted intake; cracked or dirty valves in the head; gaskets torn or burned causing pressure to be redirected into the intake. Root problem is caused by carbon deposits and heat. Carbon can be formed if oil is drawn into cylinder due to worn rings or the wrong kind of oil is being used. Compressor oil is formulated to prevent carbon. Engine oil will cause heavy carbon deposts. Replace gaskets worn or broken valves and bad check valves to restore pressure. enjoy

Posted on Nov 29, 2008

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1 Answer

Air compressor not unloading


Check the pressure switch. The unloader valve is actually in the pressure switch where the small air line from the tank check valve attaches to it. When the pressure switch turns the motor off it then lets the head pressure bleed off so the motor can restart the next time pressure drops in the tank. If it's not working and bleeding off the head pressure the cold start valve (the one with the pin in it) also won't open so the motor can restart and warn up properly.

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1 Answer

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The unloader is designed to release the pressure in the discharge tube after the unit reaches set pressure. The unloader is usually located within the pressure switch and is enabled with a small lever opening a valve (some look like tire stem). You can verify if it is working by cycling compressor and listening for release of air after unit reaches set pressure. Some compressors do not have a built-in unloader relying instead on loose fitting parts to bleed out air. On these units, air leaking back from the intank checkvalve will cause problem of loaded/backpressure and the motor cannot overcome. Easy to verify if checkvalve is leaking; with pressure in tank remove the discharge tube at the checkvalve and spray soapy water. Clean or replace this valve as needed. Good luck

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1 Answer

Second time compressor tries to fill tank blows braker


The compressor pobably has a faulty unloader valve which bleeds the pressure off that is left in the cylinder when the compressor turns off . The unloader valve allows the compressor to start the next on cycle with the cylinder empty. Trying to start the compressor with the cylinder under pressure causes too much current draw and trip the circuit breaker.

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Sounds like the cutoff valve is failing to cut power off to the compressor drive motor, while it activates the unloader.--- I'd consider looking closely at the contacts, or replacing the cutoff.

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Yes, your compressor will work just fine with a Load Genie continuous run unloader from www.grainger.com. The part number is 4tk14 with a cost of about 45.00. This unloader has a built in check valve so you can remove the present in-tank checkvalve and save it for later use. All that you need to do is install the unloader at the tank and compressed air in to top of valve. (you may have to buy extra fittings to make it work with your tubing size) Adjust valve to open just before the pressure switch cut-off setting. The unloader will bypass the compressed air and will have less stress on the motor. You will not need to use the present unloader at the pressure switch. The only caution is to manually unload the Load Genie upon initial start if there is pressure in the line. Good Luck with your project.

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The problem that you describe is caused by the in-tank check valve and/ or the unloader at the pressure switch. When the compressor cycles off the pressure switch releases the air that remains in the air line thru a small valve. There is a 1/4 " plastic tube extending from the check valve to the switch. Listen for the release of air as soon as the compressor stops. There is a small metal tab that pushes on the unloader valve that may need to be adjusted. The motor does not have enough power to start pumping if there is air/backpressure in the air line. If these parts are working correctly then check the value of the start capacitor and use meter to measure. The cap should test within 95 % of stated value. Parts are available at www.chpower.com. Enjoy

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