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I have a McMillan C16 air compressor that starts running hot and then trips the circuit breaker. It's a 15 amp unit that I have plugged into a 15 amp point but I have the unit plugged into a 20m extension cord. I was also wondering about the type of oil that can and can't be used.

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The extension cord is two long, causing the over heating, causing the breaker to trip. A good oil to use would be a 10w-30. GOOD LUCK FRIEND.

Posted on Dec 01, 2014

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Posted on Jan 02, 2017

  • 4 Answers

SOURCE: Air compressor trips breaker

check the ground wire most common mistake

Posted on Nov 19, 2008

  • 2 Answers

SOURCE: Air compressor trips motor breaker

PLEASE CHECK THE CAPACTORS ON THE MTR, THE MTR WILL BE HARDER TO START AFTER IT HAS AIR IN THE TANK

Posted on Nov 26, 2008

  • 1383 Answers

SOURCE: craftsman 33 gallon air comp keeps kicking breaker

There are several conditions that would cause the problem that you have. Worn bearings, weak capacitor, or leaking in-tank checkvalve. Worn bearings would allow armature to drag against the field windings. Easy to check, motor shaft will feel loose in housing and the bearings will be noisy when you turn by hand. Motor capacitors should read to within 95% of uf value printed on side. You must remove at least one lead and short connectors for a moment then read with meter. Repair shops will generally test for free if you do not have a cap. tester. The in-tank check valve will cause undue strain on the motor if it leaks pressure back to pump from tank. Follow air discharge hose to brass valve at tank. Simple test with air in tank remove airline at checkvalve and look/listen or soapy water. Replace if it leaks or remove and clean debris till no leak. If motor strains with no air in tank I would rule-out check valve. One final condition, which is rare, is the flyball switch inside of motor. The motor has a start winding and run winding. Contacts to this internal switch will sometimes fuse in start position and cause your condition, however a motor stuck in this position will make an unusal sound because it cannot switch to run position. (like a car stuck in first gear) If you feel that this could be the problem, remove motor rear cover and sand contacts. Good Luck on your repair and email if you have specific question.

Posted on Apr 03, 2009

  • 67 Answers

SOURCE: Electric Air compressor just hums then trips breaker.

usally there is a releaf valve that takes the pressure off the compressor while it is resting. If that pressure is not off when the drive piston starts the motor will overload and blow the the breaker or reset. Check for a releaf valve for when the unit has reached full pressure

Posted on Jun 16, 2009

  • 2 Answers

SOURCE: Air compressor starts slowly and then trips 20 amp breaker.

jsd

Posted on Mar 07, 2010

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At times it starts and runs fine.Then at times it starts and stops because the circut breaker in my house has been tripped.


Check the amp rating on the circuit breaker. It's probably 15 amps. Find another line with a 20 amp breaker, and see if it still trips.

May 31, 2015 | Air Tools & Compressors

1 Answer

How do i fix my dewalt 55155 air compressor


It is a 15 amps motor and will need 6 times (90) that amount of amps to start up. Plugging it into a 15 amps circuit may work but a 20 amps circuit is more apropiate. Kitchen circuits are 20 amp circuits.
You can try plugging the compressor directly into the wall and see if it refills with air without trippiing the circuit breaker. Using an extension cord should be done with a #12 or #10 wire gage type, smaller type will cause a power loss in the cord and will cause the compressor motor to trip the circuit breaker.
Power formula is I square R, or the amps multiplied by itself and by the resistance of the wire. E.G. 90x90x4 = 3200 watts. This is at start up. To find the voltage drop divide the watts by current, 3200/90 = .... get the point? Keep voltage drops to a minimum, use heavy wire gage extension cords.

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1 Answer

I have a Campbell Hausfeld oil type direct drive 7 gallon compressor. It often works fine but it frequently locks up until the internal circuit breaker cuts off the electricity to the motor. When the...


In our shop we have found the conditions you describe are almost always attributable to the power supply. First, never run a compressor on an extension cord, you are always better off running longer air lines. If you absolutely have to run an extension cord use a least a 12 guage cord no longer than 25 feet. If possible plug the compressor in as close to the circuit box as possible. Lastly the circuit the compressor is plugged into should be rated at least 15 amps, 20 amps is recommended for most compressors. Low amp lines cause the motor to overheat trying to get enough power and usually blow the circuit breaker at the motor and not at the circuit breaker. Lastly, use only compressor oil in the pump and make sure it's not overfull. This will also cause the motor to work harder and trip the circuit breaker.

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1 Answer

AC runs for 5 minutes and then circuit breaker


What else do you have running on hydro while AC is running? Such as coffee maker, microwave, water heater, fridge. That 30 amp breaker is your main breaker I assume, or breaker on pole your plugged in to. Keep in mind your AC will normally draw approx. 15-17+ amps momentarily when compressor kicks in to cool, then drop back to 12-15 amps when running normal. If your AC is drawing too much current, then you would only normally trip 20 amp breaker for AC in your panel. Try switching other appliances to gas operation while running AC, such as water heater, and fridge. Make sure incoming voltage is up to specs as well . (115-120 volts)
If water heater takes 5-8 amps, and fridge takes same when they are calling for power, you'll be close or over the 20amp mark when you consider your on board converter etc. as well. That only leaves approx 10 amps for AC that requires approx 15 amps to run, and up to 20amps when compressor kicks in. If you switch all those other items over to propane, and it still happens, then a current draw test should be done on AC unit to see if perhaps a capacitor is faulty, or possible compressor faulty.

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1 Answer

Compressor won't sstay running and trip breaker


You gave a lot of information, but you didn't say if it worked when free wheeling. If not, I would suspect the inertia switch. If it is working, you should hear it click when the motor is winding down after being shut off, at least when free wheeling. A 20 amp breaker will certainly handle a 15 FLA motor, even on startup. They don't trip at 20 amps exactly, especially on a simple overload. Even at twice the rated amperage, it can take several minutes to trip it. They will trip quickly on a dead short, however, or a severe overload. I doubt the windings are shorted or it either wouldn't work (start windings) or would run at a slower speed with the inertia switch constantly tripping in and out with it coasting while tripped in (i.e., accelerate, coast, accelerate, coast, etc.)

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Unit shuts off on hot days


It may be low on refrigerant. On hotter days, the compressor has to run longer to reach the temperature you have on your thermostat. Have it checked for the proper refrigerant charge and have them test how many amps that the compressor is pulluig as well. With the proper breaker installed, the unit should not be tripping out. Make sure that the breaker that is in there now is actually the proper one for your unit.
Best regrds, --W/D--

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1 Answer

Central AC unit replaced breaker trips after running 20min


Unit is drawing two may amps for the breaker. Could be compressor sticking.

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1 Answer

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Two things that you could check: 1) If you have access to an ampmeter, determine if the unit is drawing over over 14 or 15 amps, 2) replace the suspect circuit breaker in case it is beginning to go bad. Breakers only trip for overcurrent conditions or failure of the breaker itself. If it is pulling close to 15 amps, then it could heat up over time and trip.

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2 Answers

I turn on the unit and in about 1 .5 min it trips the cb ,, I put a amp probe on the circuit and found out that after 1.5 the unit jumps up to 40 amps on a 15 amp breacker which the unit is rated for . the...


You are going to have to install a disconnect box next to the unit, with the proper sized fused disconnect inside, and have a new breaker installed at the panel, when the unit comes on, its the compressor that takes the most energy to run, the compressor at start up draws alot of amps, You will need to talk to an Electrician to do your breaker and disconnect work,

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