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Converting a 220 to 110?

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Joe in MO

09-09-2002 08:05:53




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I had to replace my older central AC unit, when I had it removed, I took the two fan units off the condensor, I had replaced one two years ago, and the other still worked OK,, I have the capacitors as well, I know they were both 220, is there a way to convert them to 110, and use them as exhaust fans? I am thinking of building a paint/spray box for the shop and installing them in the top of the box to remove the fumes.. I've have wired 110 outlets etc.. before and can also put in a seperate circuit for the fans,, any help or advice would be appricated.. thanks

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Joe in MO

09-10-2002 07:48:27




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 Re: Converting a 220 to 110? in reply to Joe in MO, 09-09-2002 08:05:53  
Thanks all for your comments.. I'll look at the motors again, and forget about the paint booth idea, I saw one in a wood magazine that some built using two electric box fans. one blowing in and one on top blowing out... I'll think I'll forget this idea and continue to spray with the doors open instead.. my other idea then would be just to mount them as standard exhaust fans over the work table just to circulate the air.. I also would probabaly ask someone to wire a 240 volt outlet if I cannot put them to 110.. just hate to see them go to waste,,, one motor cost me $100 to replace a couple of years ago...

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Denny

09-10-2002 05:43:51




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 Re: Converting a 220 to 110? in reply to Joe in MO, 09-09-2002 08:05:53  
Joe, you will have some problems with the National Electrical Code with the motors you want to use for exhaust fans in your spray booth. The motors can produce an arc when starting and running and that is not a good thing with paint spray and fumes being around them. If you check article 516 of the National Electricial Code you will find that you will have code violations with this setup. I would urge you not to do it that way.

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Don LC

09-09-2002 20:49:49




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 Re: Converting a 220 to 110? in reply to Joe in MO, 09-09-2002 08:05:53  
Don't use these motors in a paint booth !!!!!
Check the plates on each motor, could be they are 110v motors split off from the 220v eqipment panel they were used in.....



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Bus Driver

09-10-2002 05:03:40




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 Re: Re: Converting a 220 to 110? in reply to Don LC, 09-09-2002 20:49:49  
The condensor units for residential central air conditioning do not have a 120 volt supply- strictly 240 volts. The motors will not be for 120 volts.



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Terry H

09-10-2002 13:37:30




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 Re: Re: Re: Converting a 220 to 110? in reply to Bus Driver, 09-10-2002 05:03:40  
I beg to differ. It is not only possible, but quite frequently 120V is used in the compressor unit to operate relay and contactor transformers. It is quite likely that the fan motors are 120V motors. The best advice is to check the data plate on the motors. Even if they are currently wired for 240V, most can be converted to 120 simply by moving a jumper wire in the motor. That info should also be on the plate.

Terry H

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Bus Driver

09-13-2002 19:26:59




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 Re: Re: Re: Re: Converting a 220 to 110? in reply to Terry H, 09-10-2002 13:37:30  
The post by Terry is well written and the language indicates a knowledge of the technical issues involved. To make this rather brief, I have never seen a residential condensor unit with any 120 volt components. Have never seen one wired with a neutral conductor included, recommended,or required. The contactors I have seen are operated by the 24 volt control circuit. To see if my region uses different equipment than other areas, I checked a Grainger catalog- not the latest one. There were exactly 100 single phase condensor fan motors listed. Only one of them was listed for both 115-208/240. There were three listed for 115 only. All the 96 others were listed for 208 and higher voltages. This makes me trust the observations that led to the remarks that I posted earlier. Those who have 120/240 (115/230) volt condensor motors have only one choice for a replacement at Grainger.

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Bus Driver

09-09-2002 17:37:04




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 Re: Converting a 220 to 110? in reply to Joe in MO, 09-09-2002 08:05:53  
The motors themselves cannot be converted at less than the cost of a new motor. The cheapest option is to wire for a 240 volt outlet for them only. Be sure to use the proper receptacle for the voltage and amperage- avoids accidental plugging in of 120 volt equipment. The other option is to find a cheap (surplus) transformer for 120/240.



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dg

09-09-2002 13:33:29




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 Re: Converting a 220 to 110? in reply to Joe in MO, 09-09-2002 08:05:53  
You need to be careful. Most exhaust motors on commerical paint booths are explosion proof or sealed motor. If you had any arcing in the motors and the conditions with the paint fumes were right you could have an explosion hazard.



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Mac

09-09-2002 11:01:11




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 Re: Converting a 220 to 110? in reply to Joe in MO, 09-09-2002 08:05:53  
Joe:
Unless specified on the motor wiring plate I dont think you can do that. Also might consider the RPMS, sometimes an exhaust fan can run to fast. I have found that large slow is better than small fast.



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jake

09-10-2002 08:43:38




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 Re: Re: Converting a 220 to 110? in reply to Mac, 09-09-2002 11:01:11  
I doubt that the motors are 220 V. The 220 is used for the compressor only, any accessories as the fan take 1 hot and 1 neutral for 110. An easy way to check it out is to connect 110 to the motor [remove the fan] and plug it in, there is no reason to power a fan with 220.



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jake

09-10-2002 08:47:04




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 Re: Re: Re: Converting a 220 to 110? in reply to jake, 09-10-2002 08:43:38  
Forgot to mention the start and run capacitors are for the compressor only.



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