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Can my 240 volt compressor run on 208 volts?

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Being an Authorized Service Center for a couple air compressor companies I can tell you I have replaced several 240 volt motors because they were run on 208 volts. Not knowing what model you have or what motor is on it, yes your compressor will run on 208 volts but it is very ******* the motor. At startup, all voltages have a dropoff then come back up to their rated voltage. The dropoff is determined by the original voltage and length and guage of lines getting the power from your transformer to the compressor With 208 volts it typically drops to around 190 volts at startup then comes back up to 205 to 208 volts while running. The motor needs the full 240 volts when it restarts and there is already pressure in the tank If the motor's not marked, call the manufacturer and see if it's rated for up to 240 volts or only for 240 volts.

Posted on Feb 09, 2012

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Posted on Jan 02, 2017

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SOURCE: need to convert my 110 volt 15amp to 240 volt

You can buy a transformer which allows all 110v power tools to work from a 240v supply. You will also need to change the plug on the compressor to a yellow 110v type. You can buy transformers for around £25 and around £3 for the plug

Posted on Mar 29, 2009

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SOURCE: what size line should i run to a 60 gallon air

You need to up size your wire. According to one site I pulled up on the Intranet and input your information, which was 208VAC, 15 AMP and 375 feet it said you need #6 AWG wire.

Posted on Nov 02, 2009

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SOURCE: why did my craftsman 5 hp 240 volt 125 psi air

your motor overheated from too low a voltage if theres a manual reset try this,also replace the two motor start and run capacitors on the motor body

Posted on Dec 24, 2009

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You have to change the wires in the motor according to the wiring diagram on the motor before you can convert the motor to 120 Volt.

The standard colors you should use would be black and white for line and load and green for ground. If you just have a copper wire and it is not coated with a green coating then you will use the standard copper wire for ground.

Posted on Sep 28, 2010

  • 1383 Answers

SOURCE: We've purchased a Kobalt 60 Gallon, Volt 208-240,

Your compressor is designed to be used in a shop situation (not portable) and is usually wired to a switch box similar to how your central air condenser is wired. It can however be wired with a short cord to a 220v plug. Your compressor motor is most likely wired to the pressure switch so all that you need do is to connect your pigtail from the pressure switch to the wall. You can buy all the parts that you will need at Lowes. You will notice that your motor has two wires going thru the contacts of the pressure switch. The inside cover of the switch will clue you in to wiring but if it does not have an illustration just match the black to black and white to white (110 v lines) and green to the ground screw at the pressure switch. Here is a good web site for another view:

Posted on Nov 05, 2010

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You'd need to supply a "Buck-Boost" transformer to do this properly. Technically, the 265 VAC is one hot leg and neutral of a 480 VAC 3 Phase Y system that measures 277 VAC. The 265 number comes from this:

265 is the standard nameplate voltage for a 277 volt motor or AC unit.

230 is standard name plate for 240.
200 is standard name plate for 208
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Most electricians call the hot leg / neutral circuit "277V AC".

Some popular "Buck-Boost" transformers will convert 208 to 240 and 240 to 208 volt systems, and 240 to 277 and 277 to 240 volt systems - among many other variations. These are auto-transformers as the primary secondary windings share a connection. KVA ratings differ significantly from name plate because of this fact. You should contact a qualified electrician to not only size, but wire the transformer for you. Failure to install a Buck-Boost transformer - and running this unit on 240V AC mains will cause premature failure of motors - fans and compressor due to overheating. This can also result in a fire hazard.

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I need to know the power requirements for this piece of equipment. Single or 3 phase, voltage, amps etc.

It is single phase. Either 208 volts 3240 watts or 240 volts 4316 watts. Unfortunately, its difficult to know which one you have. It can be ordered either way. Here's the deal, For no apparent reason, some buildings have 208 volts, some have 240 volts. If you know when you buy new equipment, you specify which voltage you have. So if your building has 208 volts and the machine is 240, it will still work, maybe a little slower to heat up. If it is the other way around, your building has 240 volts and the machine has 208 elements, it will heat up much faster, but the life of the elements is drastacally reduced becuse they burn out much quicker. You can call Lang at 314 781 2777 ask for technical assistance and they may have a way to find the voltage if the tag is missing.

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New motor for Coleman Powermate 60 gallon compressor

Hi there and first and foremost, just want to say Thank you for your service.

Generally for larger air compressors, the factory motor is designed to do the correct amount of work to power everything. Your wanted to step down from 240 volt motor to a 120 volt motor will probably not work. Let me explain why.

The factory 240 volt motor is going to produce more torque. It would be Tough to find a 120volt motor to match that amount of torque. The compressor or piston pump that the motor powers, requires a certain amount of torque, and speed. If you can dig in and find the compressor pump it should state right on the housing the required power to operate efficiently.

Another possible issue with going with a smaller motor is Shaft size. The 240 volt motor will tend to have a large shaft diameter then a 120.

I hope this helps, although a smaller motor would save you money on your electric bills, it just simply wont get the job done.

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